Netty、MINA、Twisted一起學系列10：執行緒模型

public class TcpServer {

  public static void main(String[] args) throws IOException {
    IoAcceptor acceptor = new NioSocketAcceptor(4); // 配置I/O processor thread執行緒數量
    acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory()));
    acceptor.getFilterChain().addLast("executor", new ExecutorFilter()); // 將TcpServerHandle中的業務邏輯拿到ExecutorFilter的執行緒池中執行
    acceptor.setHandler(new TcpServerHandle());
    acceptor.bind(new InetSocketAddress(8080));
  }

}

class TcpServerHandle extends IoHandlerAdapter {

  @Override
  public void messageReceived(IoSession session, Object message)
      throws Exception {

    // 假設這裡有個變態的SQL要執行3秒
    Thread.sleep(3000);
  }
}

EventLoopGroup bossGroup = new NioEventLoopGroup();  
EventLoopGroup workerGroup = new NioEventLoopGroup();

EventLoopGroup bossGroup = new NioEventLoopGroup(1);

public class TcpServer {

  public static void main(String[] args) throws InterruptedException {
    EventLoopGroup bossGroup = new NioEventLoopGroup(1); // 伺服器監聽一個埠號，boss執行緒數建議設定成1
    EventLoopGroup workerGroup = new NioEventLoopGroup(4); // worker執行緒數設定成4
    try {
      ServerBootstrap b = new ServerBootstrap();
      b.group(bossGroup, workerGroup)
          .channel(NioServerSocketChannel.class)
          .childHandler(new ChannelInitializer<SocketChannel>() {

            // 建立一個16個執行緒的執行緒組來處理耗時的業務邏輯
            private EventExecutorGroup group = new DefaultEventExecutorGroup(16);

            @Override
            public void initChannel(SocketChannel ch) throws Exception {
              ChannelPipeline pipeline = ch.pipeline();
              pipeline.addLast(new LineBasedFrameDecoder(80));
              pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));

              // 將TcpServerHandler中的業務邏輯放到EventExecutorGroup執行緒組中執行
              pipeline.addLast(group, new TcpServerHandler());
            }
          });
      ChannelFuture f = b.bind(8080).sync();
      f.channel().closeFuture().sync();
    } finally {
      workerGroup.shutdownGracefully();
      bossGroup.shutdownGracefully();
    }
  }

}

class TcpServerHandler extends ChannelInboundHandlerAdapter {

  @Override
  public void channelRead(ChannelHandlerContext ctx, Object msg) throws InterruptedException {

    // 假設這裡有個變態的SQL要執行3秒
    Thread.sleep(3000);

  }
}

# -*- coding:utf-8 –*-

import time
from twisted.internet.protocol import Protocol
from twisted.internet.protocol import Factory
from twisted.internet import reactor

# 耗時、阻塞的業務邏輯
def logic(data):
    print data
    time.sleep(3) # 假設這裡有個變態的SQL要執行3秒    

class TcpServerHandle(Protocol):

    def dataReceived(self, data):
        reactor.callInThread(logic, data) # 線上程池中執行logic(data)耗時任務，不在reactor執行緒中執行

reactor.suggestThreadPoolSize(8) # 設定執行緒池的執行緒數量為8

factory = Factory()
factory.protocol = TcpServerHandle
reactor.listenTCP(8080, factory)
reactor.run()

# -*- coding:utf-8 –*-

import time
from twisted.internet.protocol import Protocol
from twisted.internet.protocol import Factory
from twisted.internet import reactor

# 非執行緒安全的程式碼
def notThreadSafe():
    print "notThreadSafe"

# 耗時、阻塞的業務邏輯
def logic(data):
    print data
    time.sleep(3) # 假設這裡有個變態的SQL要執行3秒
    reactor.callFromThread(notThreadSafe) # 在reactor執行緒中執行notThreadSafe()


class TcpServerHandle(Protocol):

    def dataReceived(self, data):
        reactor.callInThread(logic, data) # 線上程池中執行logic(data)耗時任務，不在reactor執行緒中執行

reactor.suggestThreadPoolSize(8) # 設定執行緒池的執行緒數量為8

factory = Factory()
factory.protocol = TcpServerHandle
reactor.listenTCP(8080, factory)
reactor.run()

# -*- coding:utf-8 –*-

import time
from twisted.internet.protocol import Protocol
from twisted.internet.protocol import Factory
from twisted.internet import reactor, threads

# 耗時、阻塞的業務邏輯
def logic(data):
    print data
    time.sleep(3) # 假設這裡有個變態的SQL要執行3秒
    return "success"

# 回撥函式
def logicSuccess(result):
    # result即為logic函式的返回值，即"success"
    print result

class TcpServerHandle(Protocol):

    def dataReceived(self, data):
        d = threads.deferToThread(logic, data) # 將耗時的業務邏輯logic(data)放到執行緒池中執行，deferToThread返回值型別是Deferred
        d.addCallback(logicSuccess) # 新增回撥函式

reactor.suggestThreadPoolSize(8) # 設定執行緒池的執行緒數量為8

factory = Factory()
factory.protocol = TcpServerHandle
reactor.listenTCP(8080, factory)
reactor.run()