From 585491d1e6d9147a84041fe3cf1e44ddd452610d Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Wed, 14 Mar 2018 14:43:47 +0000
Subject: [PATCH 01/14] Move the documentation from the main PR to RST format.

---
 _images/components/message/overview.png | Bin 0 -> 22425 bytes
 components/message.rst                  | 235 ++++++++++++++++++++++++
 2 files changed, 235 insertions(+)
 create mode 100644 _images/components/message/overview.png
 create mode 100644 components/message.rst

diff --git a/_images/components/message/overview.png b/_images/components/message/overview.png
new file mode 100644
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diff --git a/components/message.rst b/components/message.rst
new file mode 100644
index 00000000000..ebc6703fd85
--- /dev/null
+++ b/components/message.rst
@@ -0,0 +1,235 @@
+.. index::
+   single: Message
+   single: Components; Message
+
+The Message Component
+=====================
+
+    The Message component helps application to send and receive messages
+    to/from other applications or via
+
+Concepts
+--------
+
+.. image:: /_images/components/message/overview.png
+
+1. **Sender**
+   Responsible for serializing and sending the message to _something_. This something can be a message broker or a 3rd
+   party API for example.
+
+2. **Receiver**
+   Responsible for deserializing and forwarding the messages to handler(s). This can be a message queue puller or an API
+   endpoint for example.
+
+3. **Handler**
+   Given a received message, contains the user business logic related to the message. In practice, that is just a PHP
+   callable.
+
+Bus
+---
+
+The bus is used to dispatch messages. MessageBus' behaviour is in its ordered middleware stack. When using
+the message bus with Symfony's FrameworkBundle, the following middlewares are configured for you:
+
+1. `LoggingMiddleware` (log the processing of your messages)
+2. `SendMessageMiddleware` (enable asynchronous processing)
+3. `HandleMessageMiddleware` (call the registered handle)
+
+    use App\Message\MyMessage;
+
+    $result = $this->get('message_bus')->handle(new MyMessage(/* ... */));
+
+Handlers
+--------
+
+Once dispatched to the bus, messages will be handled by a "message handler". A message handler is a PHP callable
+(i.e. a function or an instance of a class) that will do the required processing for your message. It _might_ return a
+result.
+
+    namespace App\MessageHandler;
+
+    use App\Message\MyMessage;
+
+    class MyMessageHandler
+    {
+       public function __invoke(MyMessage $message)
+       {
+           // Message processing...
+       }
+    }
+
+
+    <service id="App\Handler\MyMessageHandler">
+       <tag name="message_handler" />
+    </service>
+
+**Note:** If the message cannot be guessed from the handler's type-hint, use the `handles` attribute on the tag.
+
+### Asynchronous messages
+
+Using the Message Component is useful to decouple your application but it also very useful when you want to do some
+asychronous processing. This means that your application will produce a message to a queuing system and consume this
+message later in the background, using a _worker_.
+
+#### Adapters
+
+The communication with queuing system or 3rd parties is for delegated to libraries for now. You can use one of the
+following adapters:
+
+- [PHP Enqueue bridge](https://github.com/sroze/enqueue-bridge) to use one of their 10+ compatible queues such as
+ RabbitMq, Amazon SQS or Google Pub/Sub.
+
+Routing
+-------
+
+When doing asynchronous processing, the key is to route the message to the right sender. As the routing is
+application-specific and not message-specific, the configuration can be made within the `framework.yaml`
+configuration file as well:
+
+    framework:
+       message:
+           routing:
+               'My\Message\MessageAboutDoingOperationalWork': my_operations_queue_sender
+
+Such configuration would only route the `MessageAboutDoingOperationalWork` message to be asynchronous, the rest of the
+messages would still be directly handled.
+
+If you want to do route all the messages to a queue by default, you can use such configuration:
+
+    framework:
+       message:
+           routing:
+               'My\Message\MessageAboutDoingOperationalWork': my_operations_queue_sender
+               '*': my_default_sender
+
+Note that you can also route a message to multiple senders at the same time:
+
+    framework:
+       message:
+           routing:
+               'My\Message\AnImportantMessage': [my_default_sender, my_audit_sender]
+
+Same bus received and sender
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To allow us to receive and send messages on the same bus and prevent a loop, the message bus is equipped with the
+`WrapIntoReceivedMessage` received. It will wrap the received messages into `ReceivedMessage` objects and the
+`SendMessageMiddleware` middleware will know it should not send these messages.
+
+Your own sender
+---------------
+
+Using the `SenderInterface`, you can easily create your own message sender. Let's say you already have an
+`ImportantAction` message going through the message bus and handled by a handler. Now, you also want to send this
+message as an email.
+
+1. Create your sender
+
+    namespace App\MessageSender;
+
+    use Symfony\Component\Message\SenderInterface;
+    use App\Message\ImportantAction;
+
+    class ImportantActionToEmailSender implements SenderInterface
+    {
+       private $toEmail;
+       private $mailer;
+
+       public function __construct(\Swift_Mailer $mailer, string $toEmail)
+       {
+           $this->mailer = $mailer;
+           $this->toEmail = $toEmail;
+       }
+
+       public function send($message)
+       {
+           if (!$message instanceof ImportantAction) {
+               throw new \InvalidArgumentException(sprintf('Producer only supports "%s" messages.', ImportantAction::class));
+           }
+
+           $this->mailer->send(
+               (new \Swift_Message('Important action made'))
+                   ->setTo($this->toEmail)
+                   ->setBody(
+                       '<h1>Important action</h1><p>Made by '.$message->getUsername().'</p>',
+                       'text/html'
+                   )
+           );
+       }
+    }
+
+2. Register your sender service
+
+    services:
+         App\MessageSender\ImportantActionToEmailSender:
+             arguments:
+                 - "@mailer"
+                 - "%to_email%"
+
+             tags:
+                 - message.sender
+
+3. Route your important message to the sender
+
+    framework:
+       message:
+           routing:
+               'App\Message\ImportantAction': [App\MessageSender\ImportantActionToEmailSender, ~]
+
+**Note:** this example shows you how you can at the same time send your message and directly handle it using a `null`
+(`~`) sender.
+
+Your own receiver
+-----------------
+
+A consumer is responsible of receiving messages from a source and dispatching them to the application.
+
+Let's say you already proceed some "orders" on your application using a `NewOrder` message. Now you want to integrate with
+a 3rd party or a legacy application but you can't use an API and need to use a shared CSV file with new orders.
+
+You will read this CSV file and dispatch a `NewOrder` message. All you need to do is your custom CSV consumer and Symfony will do the rest.
+
+1. Create your receiver
+
+    namespace App\MessageReceiver;
+
+    use Symfony\Component\Message\ReceiverInterface;
+    use Symfony\Component\Serializer\SerializerInterface;
+
+    use App\Message\NewOrder;
+
+    class NewOrdersFromCsvFile implements ReceiverInterface
+    {
+       private $serializer;
+       private $filePath;
+
+       public function __construct(SerializerInteface $serializer, string $filePath)
+       {
+           $this->serializer = $serializer;
+           $this->filePath = $filePath;
+       }
+
+       public function receive() : \Generator
+       {
+           $ordersFromCsv = $this->serializer->deserialize(file_get_contents($this->filePath), 'csv');
+
+           foreach ($ordersFromCsv as $orderFromCsv) {
+               yield new NewOrder($orderFromCsv['id'], $orderFromCsv['account_id'], $orderFromCsv['amount']);
+           }
+       }
+    }
+
+2. Register your receiver service
+
+    services:
+       App\MessageReceiver\NewOrdersFromCsvFile:
+           arguments:
+               - "@serializer"
+               - "%new_orders_csv_file_path%"
+
+           tags:
+               - message.receiver
+
+3. Use your consumer
+
+    $ bin/console message:consume App\MessageReceived\NewOrdersFromCsvFile

From b40bc7146c84647831d35f88e1d2cb6148af6240 Mon Sep 17 00:00:00 2001
From: Javier Eguiluz <javier.eguiluz@gmail.com>
Date: Sun, 18 Mar 2018 20:18:39 +0100
Subject: [PATCH 02/14] Fixed the RST syntax issues

---
 components/message.rst | 149 +++++++++++++++++++++++++++--------------
 1 file changed, 99 insertions(+), 50 deletions(-)

diff --git a/components/message.rst b/components/message.rst
index ebc6703fd85..b9f05a306d6 100644
--- a/components/message.rst
+++ b/components/message.rst
@@ -8,32 +8,46 @@ The Message Component
     The Message component helps application to send and receive messages
     to/from other applications or via
 
+Installation
+------------
+
+.. code-block:: terminal
+
+    $ composer require symfony/message
+
+Alternatively, you can clone the `<https://github.com/symfony/message>`_ repository.
+
+.. include:: /components/require_autoload.rst.inc
+
 Concepts
 --------
 
 .. image:: /_images/components/message/overview.png
 
-1. **Sender**
-   Responsible for serializing and sending the message to _something_. This something can be a message broker or a 3rd
-   party API for example.
+**Sender**:
+   Responsible for serializing and sending the message to _something_. This
+   something can be a message broker or a third party API for example.
 
-2. **Receiver**
-   Responsible for deserializing and forwarding the messages to handler(s). This can be a message queue puller or an API
-   endpoint for example.
+**Receiver**:
+   Responsible for deserializing and forwarding the messages to handler(s). This
+   can be a message queue puller or an API endpoint for example.
 
-3. **Handler**
-   Given a received message, contains the user business logic related to the message. In practice, that is just a PHP
-   callable.
+**Handler**:
+   Given a received message, contains the user business logic related to the
+   message. In practice, that is just a PHP callable.
 
 Bus
 ---
 
-The bus is used to dispatch messages. MessageBus' behaviour is in its ordered middleware stack. When using
-the message bus with Symfony's FrameworkBundle, the following middlewares are configured for you:
+The bus is used to dispatch messages. MessageBus' behavior is in its ordered
+middleware stack. When using the message bus with Symfony's FrameworkBundle, the
+following middlewares are configured for you:
+
+#. ``LoggingMiddleware`` (logs the processing of your messages)
+#. ``SendMessageMiddleware`` (enables asynchronous processing)
+#. ``HandleMessageMiddleware`` (calls the registered handle)
 
-1. `LoggingMiddleware` (log the processing of your messages)
-2. `SendMessageMiddleware` (enable asynchronous processing)
-3. `HandleMessageMiddleware` (call the registered handle)
+Example::
 
     use App\Message\MyMessage;
 
@@ -42,9 +56,10 @@ the message bus with Symfony's FrameworkBundle, the following middlewares are co
 Handlers
 --------
 
-Once dispatched to the bus, messages will be handled by a "message handler". A message handler is a PHP callable
-(i.e. a function or an instance of a class) that will do the required processing for your message. It _might_ return a
-result.
+Once dispatched to the bus, messages will be handled by a "message handler". A
+message handler is a PHP callable (i.e. a function or an instance of a class)
+that will do the required processing for your message. It _might_ return a
+result::
 
     namespace App\MessageHandler;
 
@@ -58,43 +73,57 @@ result.
        }
     }
 
+.. code-block:: xml
 
     <service id="App\Handler\MyMessageHandler">
        <tag name="message_handler" />
     </service>
 
-**Note:** If the message cannot be guessed from the handler's type-hint, use the `handles` attribute on the tag.
+.. note::
 
-### Asynchronous messages
+    If the message cannot be guessed from the handler's type-hint, use the
+    ``handles`` attribute on the tag.
 
-Using the Message Component is useful to decouple your application but it also very useful when you want to do some
-asychronous processing. This means that your application will produce a message to a queuing system and consume this
+Asynchronous messages
+~~~~~~~~~~~~~~~~~~~~~
+
+Using the Message Component is useful to decouple your application but it also
+very useful when you want to do some asynchronous processing. This means that
+your application will produce a message to a queuing system and consume this
 message later in the background, using a _worker_.
 
-#### Adapters
+Adapters
+~~~~~~~~
 
-The communication with queuing system or 3rd parties is for delegated to libraries for now. You can use one of the
-following adapters:
+The communication with queuing system or third parties is for delegated to
+libraries for now. You can use one of the following adapters:
 
-- [PHP Enqueue bridge](https://github.com/sroze/enqueue-bridge) to use one of their 10+ compatible queues such as
- RabbitMq, Amazon SQS or Google Pub/Sub.
+#. `PHP Enqueue bridge`_ to use one of their 10+ compatible queues such as
+   RabbitMq, Amazon SQS or Google Pub/Sub.
 
 Routing
 -------
 
-When doing asynchronous processing, the key is to route the message to the right sender. As the routing is
-application-specific and not message-specific, the configuration can be made within the `framework.yaml`
-configuration file as well:
+When doing asynchronous processing, the key is to route the message to the right
+sender. As the routing is application-specific and not message-specific, the
+configuration can be made within the ``framework.yaml`` configuration file as
+well:
+
+.. code-block:: yaml
 
     framework:
        message:
            routing:
                'My\Message\MessageAboutDoingOperationalWork': my_operations_queue_sender
 
-Such configuration would only route the `MessageAboutDoingOperationalWork` message to be asynchronous, the rest of the
-messages would still be directly handled.
+Such configuration would only route the ``MessageAboutDoingOperationalWork``
+message to be asynchronous, the rest of the messages would still be directly
+handled.
 
-If you want to do route all the messages to a queue by default, you can use such configuration:
+If you want to do route all the messages to a queue by default, you can use such
+configuration:
+
+.. code-block:: yaml
 
     framework:
        message:
@@ -104,6 +133,8 @@ If you want to do route all the messages to a queue by default, you can use such
 
 Note that you can also route a message to multiple senders at the same time:
 
+.. code-block:: yaml
+
     framework:
        message:
            routing:
@@ -112,18 +143,20 @@ Note that you can also route a message to multiple senders at the same time:
 Same bus received and sender
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-To allow us to receive and send messages on the same bus and prevent a loop, the message bus is equipped with the
-`WrapIntoReceivedMessage` received. It will wrap the received messages into `ReceivedMessage` objects and the
-`SendMessageMiddleware` middleware will know it should not send these messages.
+To allow us to receive and send messages on the same bus and prevent a loop, the
+message bus is equipped with the ``WrapIntoReceivedMessage`` received. It will
+wrap the received messages into ``ReceivedMessage`` objects and the
+``SendMessageMiddleware`` middleware will know it should not send these messages.
 
 Your own sender
 ---------------
 
-Using the `SenderInterface`, you can easily create your own message sender. Let's say you already have an
-`ImportantAction` message going through the message bus and handled by a handler. Now, you also want to send this
-message as an email.
+Using the ``SenderInterface``, you can easily create your own message sender.
+Let's say you already have an ``ImportantAction`` message going through the
+message bus and handled by a handler. Now, you also want to send this message as
+an email.
 
-1. Create your sender
+First, create your sender::
 
     namespace App\MessageSender;
 
@@ -158,7 +191,9 @@ message as an email.
        }
     }
 
-2. Register your sender service
+Then, register your sender service:
+
+.. code-block:: yaml
 
     services:
          App\MessageSender\ImportantActionToEmailSender:
@@ -169,27 +204,35 @@ message as an email.
              tags:
                  - message.sender
 
-3. Route your important message to the sender
+Finally, route your important message to the sender:
+
+.. code-block:: yaml
 
     framework:
        message:
            routing:
                'App\Message\ImportantAction': [App\MessageSender\ImportantActionToEmailSender, ~]
 
-**Note:** this example shows you how you can at the same time send your message and directly handle it using a `null`
-(`~`) sender.
+.. note::
+
+    This example shows you how you can at the same time send your message and
+    directly handle it using a ``null`` (``~``) sender.
 
 Your own receiver
 -----------------
 
-A consumer is responsible of receiving messages from a source and dispatching them to the application.
+A consumer is responsible of receiving messages from a source and dispatching
+them to the application.
 
-Let's say you already proceed some "orders" on your application using a `NewOrder` message. Now you want to integrate with
-a 3rd party or a legacy application but you can't use an API and need to use a shared CSV file with new orders.
+Let's say you already proceed some "orders" on your application using a
+``NewOrder`` message. Now you want to integrate with a 3rd party or a legacy
+application but you can't use an API and need to use a shared CSV file with new
+orders.
 
-You will read this CSV file and dispatch a `NewOrder` message. All you need to do is your custom CSV consumer and Symfony will do the rest.
+You will read this CSV file and dispatch a ``NewOrder`` message. All you need to
+do is your custom CSV consumer and Symfony will do the rest.
 
-1. Create your receiver
+First, create your receiver::
 
     namespace App\MessageReceiver;
 
@@ -219,7 +262,9 @@ You will read this CSV file and dispatch a `NewOrder` message. All you need to d
        }
     }
 
-2. Register your receiver service
+Then, register your receiver service:
+
+.. code-block:: yaml
 
     services:
        App\MessageReceiver\NewOrdersFromCsvFile:
@@ -230,6 +275,10 @@ You will read this CSV file and dispatch a `NewOrder` message. All you need to d
            tags:
                - message.receiver
 
-3. Use your consumer
+Finally, use your consumer:
+
+.. code-block:: terminal
 
     $ bin/console message:consume App\MessageReceived\NewOrdersFromCsvFile
+
+.. _`PHP Enqueue bridge`: https://github.com/sroze/enqueue-bridge

From b26de803dc46a876f9b378378ac1055485623e8a Mon Sep 17 00:00:00 2001
From: wiese <wiese@users.noreply.github.com>
Date: Fri, 23 Mar 2018 11:22:56 +0100
Subject: [PATCH 03/14] minor doc fixes for the Message component

---
 components/message.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/components/message.rst b/components/message.rst
index b9f05a306d6..8e7c6700a8f 100644
--- a/components/message.rst
+++ b/components/message.rst
@@ -95,7 +95,7 @@ message later in the background, using a _worker_.
 Adapters
 ~~~~~~~~
 
-The communication with queuing system or third parties is for delegated to
+The communication with queuing system or third parties is delegated to
 libraries for now. You can use one of the following adapters:
 
 #. `PHP Enqueue bridge`_ to use one of their 10+ compatible queues such as
@@ -221,7 +221,7 @@ Finally, route your important message to the sender:
 Your own receiver
 -----------------
 
-A consumer is responsible of receiving messages from a source and dispatching
+A consumer is responsible for receiving messages from a source and dispatching
 them to the application.
 
 Let's say you already proceed some "orders" on your application using a

From 5c828e4dece1291de32e7fefb823734f52997ab2 Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 07:37:14 +0100
Subject: [PATCH 04/14] Update the documentation a bit, and add more
 FrameworkBundle documentation

---
 .../{message => messenger}/overview.png       | Bin
 components/{message.rst => messenger.rst}     | 162 ++++-----------
 messenger.rst                                 | 186 ++++++++++++++++++
 3 files changed, 221 insertions(+), 127 deletions(-)
 rename _images/components/{message => messenger}/overview.png (100%)
 rename components/{message.rst => messenger.rst} (58%)
 create mode 100644 messenger.rst

diff --git a/_images/components/message/overview.png b/_images/components/messenger/overview.png
similarity index 100%
rename from _images/components/message/overview.png
rename to _images/components/messenger/overview.png
diff --git a/components/message.rst b/components/messenger.rst
similarity index 58%
rename from components/message.rst
rename to components/messenger.rst
index 8e7c6700a8f..bab2131fa24 100644
--- a/components/message.rst
+++ b/components/messenger.rst
@@ -1,28 +1,27 @@
 .. index::
-   single: Message
-   single: Components; Message
+   single: Messenger
+   single: Components; Messenger
 
-The Message Component
-=====================
+The Messenger Component
+=======================
 
-    The Message component helps application to send and receive messages
-    to/from other applications or via
+    The Messenger component helps application send and receive messages to/from other applications or via message queues.
 
 Installation
 ------------
 
 .. code-block:: terminal
 
-    $ composer require symfony/message
+    $ composer require symfony/messenger
 
-Alternatively, you can clone the `<https://github.com/symfony/message>`_ repository.
+Alternatively, you can clone the `<https://github.com/symfony/messenger>`_ repository.
 
 .. include:: /components/require_autoload.rst.inc
 
 Concepts
 --------
 
-.. image:: /_images/components/message/overview.png
+.. image:: /_images/components/messenger/overview.png
 
 **Sender**:
    Responsible for serializing and sending the message to _something_. This
@@ -47,11 +46,20 @@ following middlewares are configured for you:
 #. ``SendMessageMiddleware`` (enables asynchronous processing)
 #. ``HandleMessageMiddleware`` (calls the registered handle)
 
-Example::
+Example:
 
     use App\Message\MyMessage;
+    use Symfony\Component\Messenger\MessageBus;
+    use Symfony\Component\Messenger\HandlerLocator;
+    use Symfony\Component\Messenger\Middleware\HandleMessageMiddleware;
 
-    $result = $this->get('message_bus')->handle(new MyMessage(/* ... */));
+    $bus = new MessageBus([
+        new HandleMessageMiddleware(new HandlerLocator([
+            MyMessage::class => $handler,
+        ]))
+    ]);
+
+    $result = $bus->handle(new MyMessage(/* ... */));
 
 Handlers
 --------
@@ -59,7 +67,7 @@ Handlers
 Once dispatched to the bus, messages will be handled by a "message handler". A
 message handler is a PHP callable (i.e. a function or an instance of a class)
 that will do the required processing for your message. It _might_ return a
-result::
+result:
 
     namespace App\MessageHandler;
 
@@ -73,80 +81,14 @@ result::
        }
     }
 
-.. code-block:: xml
-
-    <service id="App\Handler\MyMessageHandler">
-       <tag name="message_handler" />
-    </service>
-
-.. note::
-
-    If the message cannot be guessed from the handler's type-hint, use the
-    ``handles`` attribute on the tag.
-
-Asynchronous messages
-~~~~~~~~~~~~~~~~~~~~~
-
-Using the Message Component is useful to decouple your application but it also
-very useful when you want to do some asynchronous processing. This means that
-your application will produce a message to a queuing system and consume this
-message later in the background, using a _worker_.
-
 Adapters
-~~~~~~~~
+--------
 
 The communication with queuing system or third parties is delegated to
-libraries for now. You can use one of the following adapters:
-
-#. `PHP Enqueue bridge`_ to use one of their 10+ compatible queues such as
-   RabbitMq, Amazon SQS or Google Pub/Sub.
-
-Routing
--------
-
-When doing asynchronous processing, the key is to route the message to the right
-sender. As the routing is application-specific and not message-specific, the
-configuration can be made within the ``framework.yaml`` configuration file as
-well:
-
-.. code-block:: yaml
-
-    framework:
-       message:
-           routing:
-               'My\Message\MessageAboutDoingOperationalWork': my_operations_queue_sender
+libraries for now.
 
-Such configuration would only route the ``MessageAboutDoingOperationalWork``
-message to be asynchronous, the rest of the messages would still be directly
-handled.
-
-If you want to do route all the messages to a queue by default, you can use such
-configuration:
-
-.. code-block:: yaml
-
-    framework:
-       message:
-           routing:
-               'My\Message\MessageAboutDoingOperationalWork': my_operations_queue_sender
-               '*': my_default_sender
-
-Note that you can also route a message to multiple senders at the same time:
-
-.. code-block:: yaml
-
-    framework:
-       message:
-           routing:
-               'My\Message\AnImportantMessage': [my_default_sender, my_audit_sender]
-
-Same bus received and sender
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-To allow us to receive and send messages on the same bus and prevent a loop, the
-message bus is equipped with the ``WrapIntoReceivedMessage`` received. It will
-wrap the received messages into ``ReceivedMessage`` objects and the
-``SendMessageMiddleware`` middleware will know it should not send these messages.
+Create your adapter
+~~~~~~~~~~~~~~~~~~~
 
 Your own sender
 ---------------
@@ -160,8 +102,8 @@ First, create your sender::
 
     namespace App\MessageSender;
 
-    use Symfony\Component\Message\SenderInterface;
     use App\Message\ImportantAction;
+    use Symfony\Component\Message\SenderInterface;
 
     class ImportantActionToEmailSender implements SenderInterface
     {
@@ -191,33 +133,6 @@ First, create your sender::
        }
     }
 
-Then, register your sender service:
-
-.. code-block:: yaml
-
-    services:
-         App\MessageSender\ImportantActionToEmailSender:
-             arguments:
-                 - "@mailer"
-                 - "%to_email%"
-
-             tags:
-                 - message.sender
-
-Finally, route your important message to the sender:
-
-.. code-block:: yaml
-
-    framework:
-       message:
-           routing:
-               'App\Message\ImportantAction': [App\MessageSender\ImportantActionToEmailSender, ~]
-
-.. note::
-
-    This example shows you how you can at the same time send your message and
-    directly handle it using a ``null`` (``~``) sender.
-
 Your own receiver
 -----------------
 
@@ -236,11 +151,10 @@ First, create your receiver::
 
     namespace App\MessageReceiver;
 
+    use App\Message\NewOrder;
     use Symfony\Component\Message\ReceiverInterface;
     use Symfony\Component\Serializer\SerializerInterface;
 
-    use App\Message\NewOrder;
-
     class NewOrdersFromCsvFile implements ReceiverInterface
     {
        private $serializer;
@@ -262,23 +176,17 @@ First, create your receiver::
        }
     }
 
-Then, register your receiver service:
-
-.. code-block:: yaml
+Your adapter factory
+~~~~~~~~~~~~~~~~~~~~
 
-    services:
-       App\MessageReceiver\NewOrdersFromCsvFile:
-           arguments:
-               - "@serializer"
-               - "%new_orders_csv_file_path%"
+TODO.
 
-           tags:
-               - message.receiver
-
-Finally, use your consumer:
-
-.. code-block:: terminal
+Same bus received and sender
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-    $ bin/console message:consume App\MessageReceived\NewOrdersFromCsvFile
+To allow us to receive and send messages on the same bus and prevent a loop, the
+message bus is equipped with the ``WrapIntoReceivedMessage`` received. It will
+wrap the received messages into ``ReceivedMessage`` objects and the
+``SendMessageMiddleware`` middleware will know it should not send these messages.
 
 .. _`PHP Enqueue bridge`: https://github.com/sroze/enqueue-bridge
diff --git a/messenger.rst b/messenger.rst
new file mode 100644
index 00000000000..15bf1b3e32e
--- /dev/null
+++ b/messenger.rst
@@ -0,0 +1,186 @@
+.. index::
+   single: Messenger
+
+How to Use the Messenger
+========================
+
+Symfony's Messenger provide a message bus and some routing capabilities to send
+messages within your application and through adapaters such as message queues.
+Before using it, read the :doc:`Messenger component docs </components/messenger>`
+to get familiar with its concepts.
+
+Installation
+------------
+
+In applications using :doc:`Symfony Flex </setup/flex>`, run this command to
+install messenger before using it:
+
+.. code-block:: terminal
+
+    $ composer require messenger
+
+Using the Messenger Service
+---------------------------
+
+Once enabled, the :code:`message_bus` service can be injected in any service where
+you need it, like in a controller::
+
+    // src/Controller/DefaultController.php
+    namespace App\Controller;
+
+    use Symfony\Bundle\FrameworkBundle\Controller\Controller;
+    use Symfony\Component\Messenger\MessageBusInterface;
+
+    class DefaultController extends Controller
+    {
+        public function indexAction(MessageBusInterface $bus)
+        {
+            $bus->dispatch(new MyMessage());
+        }
+    }
+
+Registering Handlers
+--------------------
+
+In order to do something when your message is dispatched, you need to create a
+message handler. It's a class with an `__invoke` method:
+
+    // src/MessageHandler/MyMessageHandler.php
+    namespace App\MessageHandler;
+
+    class MyMessageHandler
+    {
+        public function __invoke(MyMessage $message)
+        {
+            // do something with it.
+        }
+    }
+
+Once you've created your handler, you need to register it:
+
+.. code-block:: xml
+
+    <service id="App\MessageHandler\MyMessageHandler">
+       <tag name="message_handler" />
+    </service>
+
+.. note::
+
+    If the message cannot be guessed from the handler's type-hint, use the
+    ``handles`` attribute on the tag.
+
+Adapters
+--------
+
+The communication with queuing system or third parties is delegated to
+libraries for now. The `built-in AMQP adapter`_ allows you to communicate with
+most of the AMQP brokers such as RabbitMQ.
+
+.. note::
+
+    If you need more message brokers, you should have a look to Enqueue's adapter
+    which supports things like Kafka, Amazon SQS or Google Pub/Sub.
+
+An adapter is registered using a "DSN", which is a string that represents the
+connection credentials and configuration. By default, when you've installed
+the messenger component, the following configuration should have been created:
+
+.. code-block:: yaml
+
+    # config/packages/messenger.yaml
+    framework:
+        messenger:
+            adapters:
+                default: "%env(MESSENGER_DSN)%"
+
+.. code-block:: env
+
+    # .env
+    ###> symfony/messenger ###
+    AMQP_DSN=amqp://guest:guest@localhost:5672/%2f/messages
+    ###< symfony/messenger ###
+
+This is enough to allow you to route your message to the :code:`messenger.default_adapter`
+adapter. This will also configure the following for you:
+
+1. A :code:`messenger.default_sender` sender to be used when routing messages
+2. A :code:`messenger.default_receiver` receiver to be used when consuming messages.
+
+Routing
+-------
+
+Instead of calling a handler, you have the option to route your message(s) to a
+sender. Part of an adapter, it is responsible of sending your message somewhere.
+You can configuration which message is routed to which sender with the following
+configuration:
+
+.. code-block:: yaml
+
+    framework:
+        messenger:
+            routing:
+                'My\Message\Message':  messenger.default_sender # Or another sender service name
+
+Such configuration would only route the ``MessageAboutDoingOperationalWork``
+message to be asynchronous, the rest of the messages would still be directly
+handled.
+
+If you want to do route all the messages to a queue by default, you can use such
+configuration:
+
+.. code-block:: yaml
+
+    framework:
+        messenger:
+            routing:
+                'My\Message\MessageAboutDoingOperationalWork': messenger.operations_sender
+                '*': messenger.default_sender
+
+Note that you can also route a message to multiple senders at the same time:
+
+.. code-block:: yaml
+
+    framework:
+        messenger:
+            routing:
+                'My\Message\ToBeSentToTwoSenders': [messenger.default_sender, messenger.audit_sender]
+
+Last but not least you can also route a message while still calling the handler
+on your application by having a :code:`null` sender:
+
+.. code-block:: yaml
+
+    framework:
+        messenger:
+            routing:
+                'My\Message\ThatIsGoingToBeSentAndHandledLocally': [messenger.default_sender, ~]
+
+Consuming messages
+------------------
+
+Once your messages have been routed, you will like to consume your messages in most
+of the cases. Do to so, you can use the :code:`messenger:consume-messages` command
+like this:
+
+.. code-block:: terminal
+
+    $ bin/console messenger:consume-messages messenger.default_receiver
+
+The first argument is the receiver's service name. It might have been created by
+your :code:`adapaters` configuration or it can be your own receiver.
+
+Your own Adapters
+-----------------
+
+Learn how to build your own adapters within the Component's documentation. Once
+you have built your classes, you can register your adapater to be able to use
+it via a DSN in the Symfony application.
+
+Register your factory
+~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: xml
+
+    <service id="Your\Adapter\Factory">
+       <tag name="messenger.adapter_factory" />
+    </service>

From 31a56ee081c24985e74af7b6c7abcb6f9d6759aa Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 11:25:17 +0100
Subject: [PATCH 05/14] Uses `::` to display as code blocks

---
 components/messenger.rst | 4 ++--
 messenger.rst            | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index bab2131fa24..f28b9af946d 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -46,7 +46,7 @@ following middlewares are configured for you:
 #. ``SendMessageMiddleware`` (enables asynchronous processing)
 #. ``HandleMessageMiddleware`` (calls the registered handle)
 
-Example:
+Example::
 
     use App\Message\MyMessage;
     use Symfony\Component\Messenger\MessageBus;
@@ -67,7 +67,7 @@ Handlers
 Once dispatched to the bus, messages will be handled by a "message handler". A
 message handler is a PHP callable (i.e. a function or an instance of a class)
 that will do the required processing for your message. It _might_ return a
-result:
+result::
 
     namespace App\MessageHandler;
 
diff --git a/messenger.rst b/messenger.rst
index 15bf1b3e32e..a72f693e612 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -43,7 +43,7 @@ Registering Handlers
 --------------------
 
 In order to do something when your message is dispatched, you need to create a
-message handler. It's a class with an `__invoke` method:
+message handler. It's a class with an `__invoke` method::
 
     // src/MessageHandler/MyMessageHandler.php
     namespace App\MessageHandler;

From 2493c9087cf203134ae8112b2878c4537a73842c Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 13:55:15 +0100
Subject: [PATCH 06/14] Update typos and missing reference

---
 components/messenger.rst | 13 ++++---------
 messenger.rst            | 10 ++++++----
 2 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index f28b9af946d..9fa828abe9f 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -38,13 +38,13 @@ Concepts
 Bus
 ---
 
-The bus is used to dispatch messages. MessageBus' behavior is in its ordered
+The bus is used to dispatch messages. MessageBus' behaviour is in its ordered
 middleware stack. When using the message bus with Symfony's FrameworkBundle, the
 following middlewares are configured for you:
 
-#. ``LoggingMiddleware`` (logs the processing of your messages)
-#. ``SendMessageMiddleware`` (enables asynchronous processing)
-#. ``HandleMessageMiddleware`` (calls the registered handle)
+#. :code:`LoggingMiddleware` (logs the processing of your messages)
+#. :code:`SendMessageMiddleware` (enables asynchronous processing)
+#. :code:`HandleMessageMiddleware` (calls the registered handle)
 
 Example::
 
@@ -176,11 +176,6 @@ First, create your receiver::
        }
     }
 
-Your adapter factory
-~~~~~~~~~~~~~~~~~~~~
-
-TODO.
-
 Same bus received and sender
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/messenger.rst b/messenger.rst
index a72f693e612..00f82a75e1e 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -73,7 +73,7 @@ Adapters
 --------
 
 The communication with queuing system or third parties is delegated to
-libraries for now. The `built-in AMQP adapter`_ allows you to communicate with
+libraries for now. The built-in AMQP adapter allows you to communicate with
 most of the AMQP brokers such as RabbitMQ.
 
 .. note::
@@ -167,14 +167,16 @@ like this:
     $ bin/console messenger:consume-messages messenger.default_receiver
 
 The first argument is the receiver's service name. It might have been created by
-your :code:`adapaters` configuration or it can be your own receiver.
+your :code:`adapters` configuration or it can be your own receiver.
 
 Your own Adapters
 -----------------
 
 Learn how to build your own adapters within the Component's documentation. Once
-you have built your classes, you can register your adapater to be able to use
-it via a DSN in the Symfony application.
+you have built your classes, you can register your adapter factory to be able to
+use it via a DSN in the Symfony application.
+
+
 
 Register your factory
 ~~~~~~~~~~~~~~~~~~~~~

From bcfae23b07559cd61bd40929f472c78e9594e70f Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 14:28:37 +0100
Subject: [PATCH 07/14] Finish the documentation about the custom adapter

---
 components/messenger.rst | 17 +++++------
 messenger.rst            | 65 ++++++++++++++++++++++++++++++++++++++--
 2 files changed, 71 insertions(+), 11 deletions(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index 9fa828abe9f..6c6a29d937b 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -136,16 +136,16 @@ First, create your sender::
 Your own receiver
 -----------------
 
-A consumer is responsible for receiving messages from a source and dispatching
+A receiver is responsible for receiving messages from a source and dispatching
 them to the application.
 
-Let's say you already proceed some "orders" on your application using a
+Let's say you already processed some "orders" in your application using a
 ``NewOrder`` message. Now you want to integrate with a 3rd party or a legacy
 application but you can't use an API and need to use a shared CSV file with new
 orders.
 
 You will read this CSV file and dispatch a ``NewOrder`` message. All you need to
-do is your custom CSV consumer and Symfony will do the rest.
+do is to write your custom CSV receiver and Symfony will do the rest.
 
 First, create your receiver::
 
@@ -179,9 +179,8 @@ First, create your receiver::
 Same bus received and sender
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-To allow us to receive and send messages on the same bus and prevent a loop, the
-message bus is equipped with the ``WrapIntoReceivedMessage`` received. It will
-wrap the received messages into ``ReceivedMessage`` objects and the
-``SendMessageMiddleware`` middleware will know it should not send these messages.
-
-.. _`PHP Enqueue bridge`: https://github.com/sroze/enqueue-bridge
+To allow us to receive and send messages on the same bus and prevent an infinite
+loop, the message bus is equipped with the :code:`WrapIntoReceivedMessage` middleware.
+It will wrap the received messages into :code:`ReceivedMessage` objects and the
+:code:`SendMessageMiddleware` middleware will know it should not route these
+messages again to an adapter.
diff --git a/messenger.rst b/messenger.rst
index 00f82a75e1e..db81055ed8c 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -61,7 +61,7 @@ Once you've created your handler, you need to register it:
 .. code-block:: xml
 
     <service id="App\MessageHandler\MyMessageHandler">
-       <tag name="message_handler" />
+       <tag name="messenger.message_handler" />
     </service>
 
 .. note::
@@ -78,7 +78,7 @@ most of the AMQP brokers such as RabbitMQ.
 
 .. note::
 
-    If you need more message brokers, you should have a look to Enqueue's adapter
+    If you need more message brokers, you should have a look to `Enqueue's adapter`_
     which supports things like Kafka, Amazon SQS or Google Pub/Sub.
 
 An adapter is registered using a "DSN", which is a string that represents the
@@ -176,7 +176,47 @@ Learn how to build your own adapters within the Component's documentation. Once
 you have built your classes, you can register your adapter factory to be able to
 use it via a DSN in the Symfony application.
 
+Create your adapter Factory
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+You need to give FrameworkBundle the opportunity to create your adapter from a
+DSN. You will need an adapter factory::
+
+    use Symfony\Component\Messenger\Adapter\Factory\AdapterInterface;
+    use Symfony\Component\Messenger\Adapter\Factory\AdapterFactoryInterface;
+
+    class YourAdapterFactory implements AdapterFactoryInterface
+    {
+        public function create(string $dsn): AdapterInterface
+        {
+            return new YourAdapter(/* ... */);
+        }
+
+        public function supports(string $dsn): bool
+        {
+            return 0 === strpos($dsn, 'my-adapter://');
+        }
+    }
+
+The :code:`YourAdaper` class need to implements the :code:`AdapterInterface`. It
+will like the following example::
+
+    use Symfony\Component\Messenger\Adapter\Factory\AdapterInterface;
+    use Symfony\Component\Messenger\Transport\ReceiverInterface;
+    use Symfony\Component\Messenger\Transport\SenderInterface;
+
+    class YourAdapter implements AdapterInterface
+    {
+        public function receiver(): ReceiverInterface
+        {
+            return new YourReceiver(/* ... */);
+        }
+
+        public function sender(): SenderInterface
+        {
+            return new YourSender(/* ... */);
+        }
+    }
 
 Register your factory
 ~~~~~~~~~~~~~~~~~~~~~
@@ -186,3 +226,24 @@ Register your factory
     <service id="Your\Adapter\Factory">
        <tag name="messenger.adapter_factory" />
     </service>
+
+Use your adapter
+~~~~~~~~~~~~~~~~
+
+Within the :code:`framework.messenger.adapters.*` configuration, create your
+named adapter using your own DSN:
+
+.. code-block:: yaml
+
+    framework:
+        messenger:
+            adapters:
+                yours: 'my-adapter://...'
+
+This will give you access to the following services:
+
+1. :code:`messenger.yours_adapter`: the instance of your adapter.
+2. :code:`messenger.yours_receiver` and :code:`messenger.yours_sender`, the
+   receiver and sender created by the adapter.
+
+.. _`PHP Enqueue bridge`: https://github.com/sroze/enqueue-bridge

From 25c0b6ec72011d74994ac7cb9d98817f122d5368 Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 14:29:20 +0100
Subject: [PATCH 08/14] It helps multiple applications  Please enter the commit
 message for your changes. Lines starting

---
 components/messenger.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index 6c6a29d937b..2eb5090ec13 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -5,7 +5,7 @@
 The Messenger Component
 =======================
 
-    The Messenger component helps application send and receive messages to/from other applications or via message queues.
+    The Messenger component helps applications send and receive messages to/from other applications or via message queues.
 
 Installation
 ------------

From a15752bad649252c8b6d5230eda4800af587ebbc Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 14:51:35 +0100
Subject: [PATCH 09/14] Fix unresolved reference

---
 messenger.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/messenger.rst b/messenger.rst
index db81055ed8c..1d5b7b4ef35 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -246,4 +246,4 @@ This will give you access to the following services:
 2. :code:`messenger.yours_receiver` and :code:`messenger.yours_sender`, the
    receiver and sender created by the adapter.
 
-.. _`PHP Enqueue bridge`: https://github.com/sroze/enqueue-bridge
+.. _`enqueue's adapter`: https://github.com/sroze/enqueue-bridge

From fb88abce74ae90b158f3b93912a368efd0c8e966 Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 14:58:40 +0100
Subject: [PATCH 10/14] Add Messenger in the topics

---
 index.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/index.rst b/index.rst
index b9e4a8d316b..ab5212eff54 100644
--- a/index.rst
+++ b/index.rst
@@ -41,6 +41,7 @@ Topics
     frontend
     http_cache
     logging
+    messenger
     performance
     profiler
     routing

From 509e1494af904a4c79fb73936d2062c55b9361ee Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Tue, 27 Mar 2018 15:13:43 +0100
Subject: [PATCH 11/14] Add a documentation about middlewares and update based
 on reviews

---
 components/messenger.rst | 21 ++++++++++++---------
 messenger.rst            | 17 ++++++++++++++++-
 2 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index 2eb5090ec13..cbbc62d3c72 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -38,9 +38,11 @@ Concepts
 Bus
 ---
 
-The bus is used to dispatch messages. MessageBus' behaviour is in its ordered
-middleware stack. When using the message bus with Symfony's FrameworkBundle, the
-following middlewares are configured for you:
+The bus is used to dispatch messages. The behaviour of the bus is in its ordered
+middleware stack. The component comes with a set of middlewares that you can use.
+
+When using the message bus with Symfony's FrameworkBundle, the following middlewares
+are configured for you:
 
 #. :code:`LoggingMiddleware` (logs the processing of your messages)
 #. :code:`SendMessageMiddleware` (enables asynchronous processing)
@@ -56,11 +58,15 @@ Example::
     $bus = new MessageBus([
         new HandleMessageMiddleware(new HandlerLocator([
             MyMessage::class => $handler,
-        ]))
+        ])),
     ]);
 
     $result = $bus->handle(new MyMessage(/* ... */));
 
+.. note:
+
+    Every middleware need to implement the :code:`MiddlewareInterface` interface.
+
 Handlers
 --------
 
@@ -87,11 +93,8 @@ Adapters
 The communication with queuing system or third parties is delegated to
 libraries for now.
 
-Create your adapter
-~~~~~~~~~~~~~~~~~~~
-
 Your own sender
----------------
+~~~~~~~~~~~~~~~
 
 Using the ``SenderInterface``, you can easily create your own message sender.
 Let's say you already have an ``ImportantAction`` message going through the
@@ -134,7 +137,7 @@ First, create your sender::
     }
 
 Your own receiver
------------------
+~~~~~~~~~~~~~~~~~
 
 A receiver is responsible for receiving messages from a source and dispatching
 them to the application.
diff --git a/messenger.rst b/messenger.rst
index 1d5b7b4ef35..8efdcad6ebe 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -93,7 +93,7 @@ the messenger component, the following configuration should have been created:
             adapters:
                 default: "%env(MESSENGER_DSN)%"
 
-.. code-block:: env
+.. code-block:: bash
 
     # .env
     ###> symfony/messenger ###
@@ -169,6 +169,21 @@ like this:
 The first argument is the receiver's service name. It might have been created by
 your :code:`adapters` configuration or it can be your own receiver.
 
+Registering your middlewares
+----------------------------
+
+The message bus is based on middlewares. If you are un-familiar with the concept,
+look at the :doc:`Messenger component docs </components/messenger>`.
+
+To register your middleware, use the :code:`messenger.middleware` tag as in the
+following example:
+
+.. code-block:: xml
+
+    <service id="Your\Own\Middleware">
+       <tag name="messenger.middleware" />
+    </service>
+
 Your own Adapters
 -----------------
 

From 3fb973c2612914e0dafcf2f1db16861d502aa3ae Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Thu, 29 Mar 2018 09:14:39 +0200
Subject: [PATCH 12/14] Update based on comments

---
 components/messenger.rst | 18 ++++++++---------
 messenger.rst            | 43 ++++++++++++++++++++--------------------
 2 files changed, 30 insertions(+), 31 deletions(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index cbbc62d3c72..1bf5f6a5bf8 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -39,14 +39,14 @@ Bus
 ---
 
 The bus is used to dispatch messages. The behaviour of the bus is in its ordered
-middleware stack. The component comes with a set of middlewares that you can use.
+middleware stack. The component comes with a set of middleware that you can use.
 
-When using the message bus with Symfony's FrameworkBundle, the following middlewares
+When using the message bus with Symfony's FrameworkBundle, the following middleware
 are configured for you:
 
-#. :code:`LoggingMiddleware` (logs the processing of your messages)
-#. :code:`SendMessageMiddleware` (enables asynchronous processing)
-#. :code:`HandleMessageMiddleware` (calls the registered handle)
+#. ``LoggingMiddleware`` (logs the processing of your messages)
+#. ``SendMessageMiddleware`` (enables asynchronous processing)
+#. ``HandleMessageMiddleware`` (calls the registered handle)
 
 Example::
 
@@ -65,7 +65,7 @@ Example::
 
 .. note:
 
-    Every middleware need to implement the :code:`MiddlewareInterface` interface.
+    Every middleware need to implement the ``MiddlewareInterface`` interface.
 
 Handlers
 --------
@@ -183,7 +183,7 @@ Same bus received and sender
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 To allow us to receive and send messages on the same bus and prevent an infinite
-loop, the message bus is equipped with the :code:`WrapIntoReceivedMessage` middleware.
-It will wrap the received messages into :code:`ReceivedMessage` objects and the
-:code:`SendMessageMiddleware` middleware will know it should not route these
+loop, the message bus is equipped with the ``WrapIntoReceivedMessage`` middleware.
+It will wrap the received messages into ``ReceivedMessage`` objects and the
+``SendMessageMiddleware`` middleware will know it should not route these
 messages again to an adapter.
diff --git a/messenger.rst b/messenger.rst
index 8efdcad6ebe..bb68744baa7 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -22,7 +22,7 @@ install messenger before using it:
 Using the Messenger Service
 ---------------------------
 
-Once enabled, the :code:`message_bus` service can be injected in any service where
+Once enabled, the ``message_bus`` service can be injected in any service where
 you need it, like in a controller::
 
     // src/Controller/DefaultController.php
@@ -33,9 +33,9 @@ you need it, like in a controller::
 
     class DefaultController extends Controller
     {
-        public function indexAction(MessageBusInterface $bus)
+        public function index(MessageBusInterface $bus)
         {
-            $bus->dispatch(new MyMessage());
+            $bus->dispatch(new SendNotification('A string to be sent...'));
         }
     }
 
@@ -97,21 +97,21 @@ the messenger component, the following configuration should have been created:
 
     # .env
     ###> symfony/messenger ###
-    AMQP_DSN=amqp://guest:guest@localhost:5672/%2f/messages
+    MESSENGER_DSN=amqp://guest:guest@localhost:5672/%2f/messages
     ###< symfony/messenger ###
 
-This is enough to allow you to route your message to the :code:`messenger.default_adapter`
+This is enough to allow you to route your message to the ``messenger.default_adapter``
 adapter. This will also configure the following for you:
 
-1. A :code:`messenger.default_sender` sender to be used when routing messages
-2. A :code:`messenger.default_receiver` receiver to be used when consuming messages.
+1. A ``messenger.default_sender`` sender to be used when routing messages
+2. A ``messenger.default_receiver`` receiver to be used when consuming messages.
 
 Routing
 -------
 
 Instead of calling a handler, you have the option to route your message(s) to a
 sender. Part of an adapter, it is responsible of sending your message somewhere.
-You can configuration which message is routed to which sender with the following
+You can configure which message is routed to which sender with the following
 configuration:
 
 .. code-block:: yaml
@@ -121,9 +121,8 @@ configuration:
             routing:
                 'My\Message\Message':  messenger.default_sender # Or another sender service name
 
-Such configuration would only route the ``MessageAboutDoingOperationalWork``
-message to be asynchronous, the rest of the messages would still be directly
-handled.
+Such configuration would only route the ``My\Message\Message`` message to be
+asynchronous, the rest of the messages would still be directly handled.
 
 If you want to do route all the messages to a queue by default, you can use such
 configuration:
@@ -146,7 +145,7 @@ Note that you can also route a message to multiple senders at the same time:
                 'My\Message\ToBeSentToTwoSenders': [messenger.default_sender, messenger.audit_sender]
 
 Last but not least you can also route a message while still calling the handler
-on your application by having a :code:`null` sender:
+on your application by having a ``null`` sender:
 
 .. code-block:: yaml
 
@@ -159,7 +158,7 @@ Consuming messages
 ------------------
 
 Once your messages have been routed, you will like to consume your messages in most
-of the cases. Do to so, you can use the :code:`messenger:consume-messages` command
+of the cases. Do to so, you can use the ``messenger:consume-messages`` command
 like this:
 
 .. code-block:: terminal
@@ -167,15 +166,15 @@ like this:
     $ bin/console messenger:consume-messages messenger.default_receiver
 
 The first argument is the receiver's service name. It might have been created by
-your :code:`adapters` configuration or it can be your own receiver.
+your ``adapters`` configuration or it can be your own receiver.
 
-Registering your middlewares
-----------------------------
+Registering your middleware
+---------------------------
 
-The message bus is based on middlewares. If you are un-familiar with the concept,
+The message bus is based on a set of middleware. If you are un-familiar with the concept,
 look at the :doc:`Messenger component docs </components/messenger>`.
 
-To register your middleware, use the :code:`messenger.middleware` tag as in the
+To register your middleware, use the ``messenger.middleware`` tag as in the
 following example:
 
 .. code-block:: xml
@@ -213,7 +212,7 @@ DSN. You will need an adapter factory::
         }
     }
 
-The :code:`YourAdaper` class need to implements the :code:`AdapterInterface`. It
+The ``YourAdaper`` class need to implement the ``AdapterInterface``. It
 will like the following example::
 
     use Symfony\Component\Messenger\Adapter\Factory\AdapterInterface;
@@ -245,7 +244,7 @@ Register your factory
 Use your adapter
 ~~~~~~~~~~~~~~~~
 
-Within the :code:`framework.messenger.adapters.*` configuration, create your
+Within the ``framework.messenger.adapters.*`` configuration, create your
 named adapter using your own DSN:
 
 .. code-block:: yaml
@@ -257,8 +256,8 @@ named adapter using your own DSN:
 
 This will give you access to the following services:
 
-1. :code:`messenger.yours_adapter`: the instance of your adapter.
-2. :code:`messenger.yours_receiver` and :code:`messenger.yours_sender`, the
+1. ``messenger.yours_adapter``: the instance of your adapter.
+2. ``messenger.yours_receiver`` and ``messenger.yours_sender``, the
    receiver and sender created by the adapter.
 
 .. _`enqueue's adapter`: https://github.com/sroze/enqueue-bridge

From 32403eac9bdf6cb9f8a23440715d121276eee12d Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Thu, 12 Apr 2018 21:13:01 +0100
Subject: [PATCH 13/14] Update the documentation to reflect the latest changes

---
 components/messenger.rst | 29 +++++++------
 messenger.rst            | 94 ++++++++++++++--------------------------
 2 files changed, 48 insertions(+), 75 deletions(-)

diff --git a/components/messenger.rst b/components/messenger.rst
index 1bf5f6a5bf8..31f73bf8c37 100644
--- a/components/messenger.rst
+++ b/components/messenger.rst
@@ -24,16 +24,15 @@ Concepts
 .. image:: /_images/components/messenger/overview.png
 
 **Sender**:
-   Responsible for serializing and sending the message to _something_. This
+   Responsible for serializing and sending messages to _something_. This
    something can be a message broker or a third party API for example.
 
 **Receiver**:
-   Responsible for deserializing and forwarding the messages to handler(s). This
+   Responsible for deserializing and forwarding messages to handler(s). This
    can be a message queue puller or an API endpoint for example.
 
 **Handler**:
-   Given a received message, contains the user business logic related to the
-   message. In practice, that is just a PHP callable.
+   Responsible for handling messages using the business logic applicable to the messages.
 
 Bus
 ---
@@ -65,15 +64,14 @@ Example::
 
 .. note:
 
-    Every middleware need to implement the ``MiddlewareInterface`` interface.
+    Every middleware needs to implement the ``MiddlewareInterface`` interface.
 
 Handlers
 --------
 
 Once dispatched to the bus, messages will be handled by a "message handler". A
 message handler is a PHP callable (i.e. a function or an instance of a class)
-that will do the required processing for your message. It _might_ return a
-result::
+that will do the required processing for your message::
 
     namespace App\MessageHandler;
 
@@ -90,8 +88,8 @@ result::
 Adapters
 --------
 
-The communication with queuing system or third parties is delegated to
-libraries for now.
+In order to send and receive messages, you will have to configure an adapter. An
+adapter will be responsible of communicating with your message broker or 3rd parties.
 
 Your own sender
 ~~~~~~~~~~~~~~~
@@ -169,18 +167,23 @@ First, create your receiver::
            $this->filePath = $filePath;
        }
 
-       public function receive() : \Generator
+       public function receive(callable $handler) : void
        {
            $ordersFromCsv = $this->serializer->deserialize(file_get_contents($this->filePath), 'csv');
 
            foreach ($ordersFromCsv as $orderFromCsv) {
-               yield new NewOrder($orderFromCsv['id'], $orderFromCsv['account_id'], $orderFromCsv['amount']);
+               $handler(new NewOrder($orderFromCsv['id'], $orderFromCsv['account_id'], $orderFromCsv['amount']));
            }
        }
+
+       public function stop(): void
+       {
+           // noop
+       }
     }
 
-Same bus received and sender
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Receiver and Sender on the same bus
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 To allow us to receive and send messages on the same bus and prevent an infinite
 loop, the message bus is equipped with the ``WrapIntoReceivedMessage`` middleware.
diff --git a/messenger.rst b/messenger.rst
index bb68744baa7..f6d271eed62 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -28,6 +28,7 @@ you need it, like in a controller::
     // src/Controller/DefaultController.php
     namespace App\Controller;
 
+    use App\Message\SendNotification;
     use Symfony\Bundle\FrameworkBundle\Controller\Controller;
     use Symfony\Component\Messenger\MessageBusInterface;
 
@@ -91,7 +92,7 @@ the messenger component, the following configuration should have been created:
     framework:
         messenger:
             adapters:
-                default: "%env(MESSENGER_DSN)%"
+                amqp: "%env(MESSENGER_DSN)%"
 
 .. code-block:: bash
 
@@ -100,17 +101,17 @@ the messenger component, the following configuration should have been created:
     MESSENGER_DSN=amqp://guest:guest@localhost:5672/%2f/messages
     ###< symfony/messenger ###
 
-This is enough to allow you to route your message to the ``messenger.default_adapter``
-adapter. This will also configure the following for you:
+This is enough to allow you to route your message to the ``amqp``. This will also
+configure the following services for you:
 
-1. A ``messenger.default_sender`` sender to be used when routing messages
-2. A ``messenger.default_receiver`` receiver to be used when consuming messages.
+1. A ``messenger.sender.amqp`` sender to be used when routing messages.
+2. A ``messenger.receiver.amqp`` receiver to be used when consuming messages.
 
 Routing
 -------
 
 Instead of calling a handler, you have the option to route your message(s) to a
-sender. Part of an adapter, it is responsible of sending your message somewhere.
+sender. Part of an adapter, it is responsible for sending your message somewhere.
 You can configure which message is routed to which sender with the following
 configuration:
 
@@ -119,40 +120,39 @@ configuration:
     framework:
         messenger:
             routing:
-                'My\Message\Message':  messenger.default_sender # Or another sender service name
+                'My\Message\Message':  amqp # The name of the defined adapter
 
 Such configuration would only route the ``My\Message\Message`` message to be
 asynchronous, the rest of the messages would still be directly handled.
 
-If you want to do route all the messages to a queue by default, you can use such
-configuration:
+You can route all classes of message to a sender using an asterisk instead of a class name:
 
 .. code-block:: yaml
 
     framework:
         messenger:
             routing:
-                'My\Message\MessageAboutDoingOperationalWork': messenger.operations_sender
-                '*': messenger.default_sender
+                'My\Message\MessageAboutDoingOperationalWork': another_adapter
+                '*': amqp
 
-Note that you can also route a message to multiple senders at the same time:
+A class of message can also be routed to a multiple senders by specifying a list:
 
 .. code-block:: yaml
 
     framework:
         messenger:
             routing:
-                'My\Message\ToBeSentToTwoSenders': [messenger.default_sender, messenger.audit_sender]
+                'My\Message\ToBeSentToTwoSenders': [amqp, audit]
 
-Last but not least you can also route a message while still calling the handler
-on your application by having a ``null`` sender:
+By specifying a ``null`` sender, you can also route a class of messages to a sender
+while still having them passed to their respective handler:
 
 .. code-block:: yaml
 
     framework:
         messenger:
             routing:
-                'My\Message\ThatIsGoingToBeSentAndHandledLocally': [messenger.default_sender, ~]
+                'My\Message\ThatIsGoingToBeSentAndHandledLocally': [amqp, ~]
 
 Consuming messages
 ------------------
@@ -163,32 +163,16 @@ like this:
 
 .. code-block:: terminal
 
-    $ bin/console messenger:consume-messages messenger.default_receiver
+    $ bin/console messenger:consume-messages amqp
 
 The first argument is the receiver's service name. It might have been created by
 your ``adapters`` configuration or it can be your own receiver.
 
-Registering your middleware
----------------------------
-
-The message bus is based on a set of middleware. If you are un-familiar with the concept,
-look at the :doc:`Messenger component docs </components/messenger>`.
-
-To register your middleware, use the ``messenger.middleware`` tag as in the
-following example:
-
-.. code-block:: xml
-
-    <service id="Your\Own\Middleware">
-       <tag name="messenger.middleware" />
-    </service>
-
 Your own Adapters
 -----------------
 
-Learn how to build your own adapters within the Component's documentation. Once
-you have built your classes, you can register your adapter factory to be able to
-use it via a DSN in the Symfony application.
+Once you have written your adapter's sender and receiver, you can register your
+adapter factory to be able to use it via a DSN in the Symfony application.
 
 Create your adapter Factory
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -196,40 +180,26 @@ Create your adapter Factory
 You need to give FrameworkBundle the opportunity to create your adapter from a
 DSN. You will need an adapter factory::
 
-    use Symfony\Component\Messenger\Adapter\Factory\AdapterInterface;
     use Symfony\Component\Messenger\Adapter\Factory\AdapterFactoryInterface;
-
-    class YourAdapterFactory implements AdapterFactoryInterface
-    {
-        public function create(string $dsn): AdapterInterface
-        {
-            return new YourAdapter(/* ... */);
-        }
-
-        public function supports(string $dsn): bool
-        {
-            return 0 === strpos($dsn, 'my-adapter://');
-        }
-    }
-
-The ``YourAdaper`` class need to implement the ``AdapterInterface``. It
-will like the following example::
-
-    use Symfony\Component\Messenger\Adapter\Factory\AdapterInterface;
     use Symfony\Component\Messenger\Transport\ReceiverInterface;
     use Symfony\Component\Messenger\Transport\SenderInterface;
 
-    class YourAdapter implements AdapterInterface
+    class YourAdapterFactory implements AdapterFactoryInterface
     {
-        public function receiver(): ReceiverInterface
+        public function createReceiver(string $dsn, array $options): ReceiverInterface
         {
             return new YourReceiver(/* ... */);
         }
 
-        public function sender(): SenderInterface
+        public function createSender(string $dsn, array $options): SenderInterface
         {
             return new YourSender(/* ... */);
         }
+
+        public function supports(string $dsn, array $options): bool
+        {
+            return 0 === strpos($dsn, 'my-adapter://');
+        }
     }
 
 Register your factory
@@ -237,7 +207,7 @@ Register your factory
 
 .. code-block:: xml
 
-    <service id="Your\Adapter\Factory">
+    <service id="Your\Adapter\YourAdapterFactory">
        <tag name="messenger.adapter_factory" />
     </service>
 
@@ -254,10 +224,10 @@ named adapter using your own DSN:
             adapters:
                 yours: 'my-adapter://...'
 
-This will give you access to the following services:
+In addition of being able to route your messages to the ``yours`` sender, this
+will give you access to the following services:
 
-1. ``messenger.yours_adapter``: the instance of your adapter.
-2. ``messenger.yours_receiver`` and ``messenger.yours_sender``, the
-   receiver and sender created by the adapter.
+1. ``messenger.sender.hours``: the sender.
+2. ``messenger.receiver.hours``: the receiver.
 
 .. _`enqueue's adapter`: https://github.com/sroze/enqueue-bridge

From c5306b8f19394dae0af5d340faec5dfc7b00852e Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Sun, 15 Apr 2018 22:13:59 +0100
Subject: [PATCH 14/14] Minor wording change

---
 messenger.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/messenger.rst b/messenger.rst
index f6d271eed62..0dbd7c15e9f 100644
--- a/messenger.rst
+++ b/messenger.rst
@@ -135,7 +135,7 @@ You can route all classes of message to a sender using an asterisk instead of a
                 'My\Message\MessageAboutDoingOperationalWork': another_adapter
                 '*': amqp
 
-A class of message can also be routed to a multiple senders by specifying a list:
+A class of message can also be routed to multiple senders by specifying a list:
 
 .. code-block:: yaml
 

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