Netty實現的一個非同步Socket程式碼

 本人寫的一個使用Netty實現的一個非同步Socket程式碼

package test.core.nio;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import java.net.InetSocketAddress;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.math.NumberUtils;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;

/**
 * @author xfyou
 * @date 2019/3/21
 */
@Slf4j
public class AsyncSocket {

  private final ClientBootstrap clientBootstrap;

  private final InetSocketAddress address;

  private int timeout;

  private static final byte CONNECTORS_POOL_SIZE = 1;

  private static final byte WORKERS_POOL_SIZE = 30;

  public AsyncSocket(String hostIp, String port, int timeout, String name) {
    final ThreadFactory threadFactory = new ThreadFactoryBuilder().setDaemon(true).setNameFormat(name + "-pool-%d").setPriority(Thread.NORM_PRIORITY).build();
    final ExecutorService connectors = new ThreadPoolExecutor(CONNECTORS_POOL_SIZE, CONNECTORS_POOL_SIZE, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(), threadFactory);
    final ExecutorService workers = new ThreadPoolExecutor(WORKERS_POOL_SIZE, WORKERS_POOL_SIZE, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(), threadFactory);
    clientBootstrap = new ClientBootstrap(new NioClientSocketChannelFactory(connectors, workers, CONNECTORS_POOL_SIZE, WORKERS_POOL_SIZE));
    address = new InetSocketAddress(hostIp, NumberUtils.toInt(port));
    clientBootstrap.setOption("remoteAddress", address);
    clientBootstrap.setOption("connectTimeoutMillis", timeout);
    this.timeout = timeout;
    addShutdownHook();
  }

  @SneakyThrows
  public byte[] send(final byte[] data) {
    final SocketEventHandler socketEventHandler = new SocketEventHandler(timeout);
    final Channel channel = clientBootstrap.getFactory().newChannel(Channels.pipeline(socketEventHandler));
    final ChannelFuture future = channel.connect(address);
    future.addListener(new ChannelFutureListener() {
      @Override
      public void operationComplete(ChannelFuture future) throws Exception {
        if (future.isSuccess()) {
          channel.write(ChannelBuffers.wrappedBuffer(data));
        } else {
          log.error("I/O operation has failed.", future.getCause());
          throw (Exception) future.getCause();
        }
      }
    });
    return socketEventHandler.getMessage();
  }

  private void addShutdownHook() {
    Runtime.getRuntime().addShutdownHook(new Thread() {
      @Override
      public void run() {
        clientBootstrap.releaseExternalResources();
      }
    });
  }

  private class SocketEventHandler extends SimpleChannelUpstreamHandler {

    private byte[] message;

    private int timeout;

    private final CountDownLatch latch = new CountDownLatch(1);

    SocketEventHandler(int timeout) {
      this.timeout = timeout;
    }

    @SneakyThrows
    byte[] getMessage() {
      latch.await(timeout, TimeUnit.MILLISECONDS);
      return message;
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
      if (null != e.getMessage()) {
        message = ((ChannelBuffer) e.getMessage()).array();
        latch.countDown();
      }
      if (null != ctx.getChannel()) {
        ctx.getChannel().close();
      }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
      if (null != ctx.getChannel()) {
        ctx.getChannel().close();
      }
      log.error("An exception was raised by an I/O thread.", e.getCause());
    }

  }

}