/** Stops the cache and network dispatchers. */
public void stop() {
if (mCacheDispatcher != null) {
mCacheDispatcher.quit();
}
for (int i = 0; i < mDispatchers.length; i++) {
if (mDispatchers[i] != null) {
mDispatchers[i].quit();
}
}
}
/**
* Starts the dispatchers in this queue.
*
* <p>start 方法中，开启一个缓存调度线程CacheDispatcher和 n 个网络调度线程NetworkDispatcher，这里 n 默认为4， 存在优化的余地，比如可以根据
* CPU 核数以及网络类型计算更合适的并发数。 缓存调度线程不断的从缓存请求队列中取出 Request 去处理，网络调度线程不断的从网络请求队列中取出 Request 去处理。
*/
public void start() {
stop(); // Make sure any currently running dispatchers are stopped.
// Create the cache dispatcher and start it.
mCacheDispatcher = new CacheDispatcher(mCacheQueue, mNetworkQueue, mCache, mDelivery);
mCacheDispatcher.start();
// Create network dispatchers (and corresponding threads) up to the pool size.
for (int i = 0; i < mDispatchers.length; i++) {
NetworkDispatcher networkDispatcher =
new NetworkDispatcher(mNetworkQueue, mNetwork, mCache, mDelivery);
mDispatchers[i] = networkDispatcher;
networkDispatcher.start();
}
}