Dubbo 默认线程池fixed

@SPI("fixed")
public interface ThreadPool {

    /**
     * 线程池
     *
     * @param url 线程参数
     * @return 线程池
     */
    @Adaptive({Constants.THREADPOOL_KEY})
    Executor getExecutor(URL url);

}

com.alibaba.dubbo.common.threadpool.ThreadPool

fixed=com.alibaba.dubbo.common.threadpool.support.fixed.FixedThreadPool
cached=com.alibaba.dubbo.common.threadpool.support.cached.CachedThreadPool
limited=com.alibaba.dubbo.common.threadpool.support.limited.LimitedThreadPool
支持三种线程池
public class FixedThreadPool implements ThreadPool {

    public Executor getExecutor(URL url) {
        String name = url.getParameter(Constants.THREAD_NAME_KEY, Constants.DEFAULT_THREAD_NAME);
        int threads = url.getParameter(Constants.THREADS_KEY, Constants.DEFAULT_THREADS);
        int queues = url.getParameter(Constants.QUEUES_KEY, Constants.DEFAULT_QUEUES);
        return new ThreadPoolExecutor(threads, threads, 0, TimeUnit.MILLISECONDS,
                queues == 0 ? new SynchronousQueue<Runnable>() :
                        (queues < 0 ? new LinkedBlockingQueue<Runnable>()
                                : new LinkedBlockingQueue<Runnable>(queues)),
                new NamedThreadFactory(name, true), new AbortPolicyWithReport(name, url));
    }

}

int threads = url.getParameter(Constants.THREADS_KEY, Constants.DEFAULT_THREADS);

这里面的Constants.DEFAULT_THREADS如下:

public static final int DEFAULT_THREADS = 200;

dubbo默认线程池大小200
dubbo默认线程池是fixed
<dubbo:protocol name="dubbo" dispatcher="all" threadpool="fixed" threads="100" />

Dispatcher

  • all 所有消息都派发到线程池,包括请求,响应,连接事件,断开事件,心跳等。
  • direct 所有消息都不派发到线程池,全部在 IO 线程上直接执行。
  • message 只有请求响应消息派发到线程池,其它连接断开事件,心跳等消息,直接在 IO 线程上执行。
  • execution 只请求消息派发到线程池,不含响应,响应和其它连接断开事件,心跳等消息,直接在 IO 线程上执行。
  • connection 在 IO 线程上,将连接断开事件放入队列,有序逐个执行,其它消息派发到线程池。
@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"})
    // 后两个参数为兼容旧配置
    ChannelHandler dispatch(ChannelHandler handler, URL url);

}
/**
 * 默认的线程池配置
 *
 * @author chao.liuc
 */
public class AllDispatcher implements Dispatcher {

    public static final String NAME = "all";

    public ChannelHandler dispatch(ChannelHandler handler, URL url) {
        return new AllChannelHandler(handler, url);
    }

}

默认线程池派发模型模型dispatcher=all:

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转载自blog.csdn.net/varyall/article/details/81545780
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