Example with 32kb buffers

tshemsedinov · tshemsedinov · commit 9d346dec6712 · 2018-07-02T20:49:50.000+03:00
diff --git a/JavaScript/7-buffer.js b/JavaScript/7-buffer.js
@@ -0,0 +1,47 @@
+'use strict';
+
+const poolify = (factory, min, norm, max) => {
+  const duplicate = n => new Array(n).fill().map(() => factory());
+
+  const pool = (item) => {
+    if (item) {
+      if (pool.allocated <= max) {
+        pool.items.push(item);
+      } else {
+        pool.allocated--;
+      }
+      console.log('Recycle item, count =', pool.items.length, pool.allocated);
+      return;
+    }
+    if (pool.items.length < min) {
+      const items = duplicate(norm - pool.items.length);
+      pool.allocated += pool.items.length;
+      pool.items.push(...items);
+    }
+    const res = pool.items.pop();
+
+    console.log('Get item, count =', pool.items.length, pool.allocated);
+    return res;
+  };
+
+  const items = duplicate(norm);
+  return Object.assign(pool, { items, allocated: norm });
+};
+
+const buffer = () => new Uint32Array(1024);
+
+const pool = poolify(buffer, 5, 10, 13);
+
+let i = 0;
+
+const next = () => {
+  const item = pool();
+  console.log('Buffer size', item.length * 32);
+  i++;
+  if (i < 20) {
+    setTimeout(next, i * 10);
+    setTimeout(() => pool(item), i * 100);
+  }
+};
+
+next();
