Add examples

tshemsedinov · tshemsedinov · commit ec093a12aa2a · 2024-07-31T07:24:48.000+03:00
diff --git a/JavaScript/1-theory.js b/JavaScript/1-theory.js
@@ -0,0 +1,52 @@
+'use strict';
+
+class Timer {
+  constructor(interval) {
+    this.interval = interval;
+    this.listeners = new Set();
+    this.instance = setInterval(() => {
+      for (const callback of this.listeners.values()) {
+        callback();
+      }
+    }, interval);
+  }
+
+  listen(callback) {
+    this.listeners.add(callback);
+  }
+}
+
+class TimerFactory {
+  static timers = new Map();
+  static getTimer(interval) {
+    const timer = TimerFactory.timers.get(interval);
+    if (timer) return timer;
+    const instance = new Timer(interval);
+    TimerFactory.timers.set(interval, instance);
+    return instance;
+  }
+}
+
+class Interval {
+  constructor(msec, callback) {
+    this.timer = TimerFactory.getTimer(msec);
+    this.timer.listen(callback);
+  }
+}
+
+// Usage
+
+class Client {
+  constructor(msec, count) {
+    this.timers = [];
+    for (let i = 0; i < count; i++) {
+      new Interval(msec, () => {});
+    }
+  }
+}
+
+const client1 = new Client(1000, 1000000);
+const client2 = new Client(2000, 1000000);
+console.log({ client1, client2 });
+const memory = process.memoryUsage();
+console.log({ memory });
diff --git a/JavaScript/2-simple.js b/JavaScript/2-simple.js
@@ -0,0 +1,37 @@
+'use strict';
+
+class Interval {
+  static timers = new Map();
+
+  constructor(msec, callback) {
+    let timer = Interval.timers.get(msec);
+    if (!timer) {
+      this.listeners = new Set();
+      this.instance = setInterval(() => {
+        for (const callback of this.listeners.values()) {
+          callback();
+        }
+      }, msec);
+      Interval.timers.set(msec, this);
+      timer = this;
+    }
+    timer.listeners.add(callback);
+  }
+}
+
+// Usage
+
+class Client {
+  constructor(msec, count) {
+    this.timers = [];
+    for (let i = 0; i < count; i++) {
+      new Interval(msec, () => {}, msec);
+    }
+  }
+}
+
+const client1 = new Client(1000, 1000000);
+const client2 = new Client(2000, 1000000);
+console.log({ client1, client2 });
+const memory = process.memoryUsage();
+console.log({ memory });
