RESTEasy：asyncExecutor在ResteasyClientBuilder中的设置
RESTEasyClientBuilder接受用户定制的「ExecutorService」作为「asyncExecutor」，下面是例子：
/**
* Executor to use to run AsyncInvoker invocations
*
* @param asyncExecutor
* @param cleanupExecutor true if the Client should close the executor when it is closed
* @return
*/
@Deprecated
public ResteasyClientBuilder asyncExecutor(ExecutorService asyncExecutor, boolean cleanupExecutor)
{
this.asyncExecutor = asyncExecutor;
this.cleanupExecutor = cleanupExecutor;
return this;
}
这个定制的「asyncExecutor」会在「build()」方法中被传入「ResteasyClient」：
@Override
public ResteasyClient build()
{
if (HTTPClientVersionCheck.isUseOldHTTPClient() || !HTTPClientVersionCheck.isNewHTTPClientAvailable()) {
return buildOld();
}
ClientConfiguration config = new ClientConfiguration(getProviderFactory());
for (Map.Entry<String, Object> entry : properties.entrySet())
{
config.property(entry.getKey(), entry.getValue());
}
ExecutorService executor = asyncExecutor;
if (executor == null)
{
cleanupExecutor = true;
executor = Executors.newFixedThreadPool(10);
}
ClientHttpEngine engine = httpEngine != null ? httpEngine : new ClientHttpEngineBuilder43().resteasyClientBuilder(this).build();
return new ResteasyClient(engine, executor, cleanupExecutor, scheduledExecutorService, config);
}
所以说，ResteasyClient是asyncExecutor的实际使用者。
此外，我在Apache CXF的ClientBuilder的设计实现当中，并没有看到它像RESTEasy一样使用ExecutorService。