189 8069 5689
dubbo中AllDispatcher的作用是什么，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
创新互联公司专注于企业全网整合营销推广、网站重做改版、边坝网站定制设计、自适应品牌网站建设、H5响应式网站、购物商城网站建设、集团公司官网建设、成都外贸网站制作、高端网站制作、响应式网页设计等建站业务，价格优惠性价比高，为边坝等各大城市提供网站开发制作服务。
dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/Dispatcher.java
@SPI(AllDispatcher.NAME)
public interface Dispatcher {
/**
* dispatch the message to threadpool.
*
* @param handler
* @param url
* @return channel handler
*/
@Adaptive({Constants.DISPATCHER_KEY, "dispather", "channel.handler"})
// The last two parameters are reserved for compatibility with the old configuration
ChannelHandler dispatch(ChannelHandler handler, URL url);
}Dispatcher接口定义了dispatch方法，返回ChannelHandler
dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/transport/dispatcher/all/AllDispatcher.java
public class AllDispatcher implements Dispatcher {
public static final String NAME = "all";
@Override
public ChannelHandler dispatch(ChannelHandler handler, URL url) {
return new AllChannelHandler(handler, url);
}
}AllDispatcher实现了Dispatcher接口，其dispatch方法返回的是AllChannelHandler
dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/transport/dispatcher/all/AllChannelHandler.java
public class AllChannelHandler extends WrappedChannelHandler {
public AllChannelHandler(ChannelHandler handler, URL url) {
super(handler, url);
}
@Override
public void connected(Channel channel) throws RemotingException {
ExecutorService executor = getExecutorService();
try {
executor.execute(new ChannelEventRunnable(channel, handler, ChannelState.CONNECTED));
} catch (Throwable t) {
throw new ExecutionException("connect event", channel, getClass() + " error when process connected event .", t);
}
}
@Override
public void disconnected(Channel channel) throws RemotingException {
ExecutorService executor = getExecutorService();
try {
executor.execute(new ChannelEventRunnable(channel, handler, ChannelState.DISCONNECTED));
} catch (Throwable t) {
throw new ExecutionException("disconnect event", channel, getClass() + " error when process disconnected event .", t);
}
}
@Override
public void received(Channel channel, Object message) throws RemotingException {
ExecutorService executor = getExecutorService();
try {
executor.execute(new ChannelEventRunnable(channel, handler, ChannelState.RECEIVED, message));
} catch (Throwable t) {
//TODO A temporary solution to the problem that the exception information can not be sent to the opposite end after the thread pool is full. Need a refactoring
//fix The thread pool is full, refuses to call, does not return, and causes the consumer to wait for time out
if(message instanceof Request && t instanceof RejectedExecutionException){
Request request = (Request)message;
if(request.isTwoWay()){
String msg = "Server side(" + url.getIp() + "," + url.getPort() + ") threadpool is exhausted ,detail msg:" + t.getMessage();
Response response = new Response(request.getId(), request.getVersion());
response.setStatus(Response.SERVER_THREADPOOL_EXHAUSTED_ERROR);
response.setErrorMessage(msg);
channel.send(response);
return;
}
}
throw new ExecutionException(message, channel, getClass() + " error when process received event .", t);
}
}
@Override
public void caught(Channel channel, Throwable exception) throws RemotingException {
ExecutorService executor = getExecutorService();
try {
executor.execute(new ChannelEventRunnable(channel, handler, ChannelState.CAUGHT, exception));
} catch (Throwable t) {
throw new ExecutionException("caught event", channel, getClass() + " error when process caught event .", t);
}
}
}AllChannelHandler继承了WrappedChannelHandler，其connected、disconnected、received、caught均是通过父类的getExecutorService获取线程池，然后执行创建的ChannelEventRunnable；received方法在捕获到异常时RejectedExecutionException且message是Request，而且request是twoWay的时候会返回SERVER_THREADPOOL_EXHAUSTED_ERROR
Dispatcher接口定义了dispatch方法，返回ChannelHandler
AllChannelHandler继承了WrappedChannelHandler，其connected、disconnected、received、caught均是通过父类的getExecutorService获取线程池，然后执行创建的ChannelEventRunnable
AllChannelHandler的received方法在捕获到异常时RejectedExecutionException且message是Request，而且request是twoWay的时候会返回SERVER_THREADPOOL_EXHAUSTED_ERROR
看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注创新互联行业资讯频道，感谢您对创新互联的支持。