// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.chrome.browser.media.router.cast;
/**
* Returns a request id in a range that is considered fairly unique. These request ids are used to
* communicate with the cast device and identify messages and their responses.
*/
public class CastRequestIdGenerator {
private static final Object LOCK = new Object();
private static CastRequestIdGenerator sInstance;
private int mRequestId;
/** Returns the next requestId in the range allocated to communicate with the device. */
public static int getNextRequestId() {
CastRequestIdGenerator instance = getInstance();
// Return the current |mRequestId| then increment. Never return 0 because it is reserved.
if (instance.mRequestId == 0) ++instance.mRequestId;
return instance.mRequestId++;
}
/** Returns the Singleton instance of the CastRequestIdGenerator. */
private static CastRequestIdGenerator getInstance() {
synchronized (LOCK) {
if (sInstance == null) sInstance = new CastRequestIdGenerator();
}
return sInstance;
}
private CastRequestIdGenerator() {
mRequestId = (int) Math.floor(Math.random() * 100000.0) * 1000;
}
}