* 获取AsyncInvoker实例
* @param workerCount 工作线程个数
*/
private AsyncInvoker(int workerCount, boolean timeoutEffect) {
workers = new AsyncWorker[workerCount];
ExecutorService executor = Executors.newCachedThreadPool(new ThreadRenameFactory("async task thread"));
for(int i=0; i<workers.length; i++) {
workers[i] = new AsyncWorker(executor, timeoutEffect);
workers[i].setDaemon(true);
workers[i].setName("async task worker[" + i + "]");