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	Reactor 模式的 JAVA NIO 多線程服務器

    

    public class MiniServer extends Thread
    {
            private static final Log log = LogFactory.getLog(MiniServer.class);
        
            private final Selector s;
            private final ServerSocketChannel ssc;
            private ExecutorService executor;
        
            public MiniServer(int portnumber,ExecutorService executor) throws IOException
            {
                this.executor=executor;
            s     = Selector.open();
            ssc     = ServerSocketChannel.open();
            ssc.socket().bind(    new InetSocketAddress(portnumber));
            ssc.configureBlocking(    false);
            ssc.register(s,SelectionKey.OP_ACCEPT);
        }
        
            public void run()
            {
                try
                {
                    while(s.isOpen())
                    {
                        int nKeys=s.select();
                        if(nKeys>0)
                        {
                        Iterator    <SelectionKey> it = s.selectedKeys().iterator();
                            while (it.hasNext()) 
                            {
                            SelectionKey key     = it.next();
                            it.remove();
                                if (!key.isValid() || !key.channel().isOpen())
                                    continue;
                                if(key.isAcceptable())
                                {
                                SocketChannel sc     = ssc.accept();
                                    if (sc != null)
                                    {
                                    sc.configureBlocking(    false);
                                    sc.register(s, SelectionKey.OP_READ,     new Reader(executor));
                                }
                            }
                                else if(key.isReadable()||key.isWritable())
                                {
                                Reactor reactor     = (Reactor) key.attachment();
                                reactor.execute(key);
                            }
                        }
                    }
                }
            }
                catch(IOException e)
                {
                log.info(e);
            }
        }
    }


    public interface Reactor 
    {
            void execute(SelectionKey key);
    }


    public class Reader implements Reactor 
    {
            private static final Log log = LogFactory.getLog(Reader.class);
        
            private byte[] bytes=new byte[0];
            private ExecutorService executor;
        
            public Reader(ExecutorService executor)
            {
                this.executor=executor;
        }
        
        @Override
            public void execute(SelectionKey key)
            {
            SocketChannel sc     = (SocketChannel) key.channel();
                try
                {
                ByteBuffer buffer    =ByteBuffer.allocate(1024);
                    int len=-1;
                    while(sc.isConnected() && (len=sc.read(buffer))>0)
                    {
                    buffer.flip();
                          byte [] content = new byte[buffer.limit()];
                    buffer.get(content);
                    bytes    =NutUtil.ArrayCoalition(bytes,content);
                    buffer.clear();
                }
                    if(len==0)
                    {
                    key.interestOps(SelectionKey.OP_READ);
                    key.selector().wakeup(); 
                }
                    else if(len==-1)
                    {
                    Callable    <byte[]> call=new ProcessCallable(bytes);
                    Future    <byte[]> task=executor.submit(call);
                    ByteBuffer output    =ByteBuffer.wrap(task.get());
                    sc.register(key.selector(), SelectionKey.OP_WRITE,     new Writer(output));
                }
            }
                catch(Exception e)
                {
                log.info(e);
            }
        }
    }


    public class Writer implements Reactor 
    {
            private static final Log log = LogFactory.getLog(Writer.class);
        
            private ByteBuffer output;
        
            public Writer(ByteBuffer output)
            {
                this.output=output;
        }
        
            public void execute(SelectionKey key)
            {
            SocketChannel sc     = (SocketChannel) key.channel();
                try
                {
                    while(sc.isConnected() && output.hasRemaining())
                    {
                        int len=sc.write(output);
                        if(len<0)
                        { 
                            throw new EOFException(); 
                    }     
                        if(len==0) 
                        { 
                        key.interestOps(SelectionKey.OP_WRITE); 
                        key.selector().wakeup(); 
                            break; 
                    }
                }
                    if(!output.hasRemaining())
                    {
                    output.clear();
                    key.cancel();
                    sc.close();
                }
            }
                catch(IOException e)
                {
                log.info(e);
            }
        }
    }
    
	
    posted on 2011-08-29 18:35 nianzai 閱讀(3107) 評論(3)  編輯  收藏  所屬分類: NIO 
    

    







    
	    
    


    
評論:

    
	

		
    
			
    
			# re: JAVA NIO 多線程服務器 1.2版
				2011-08-30 13:59 | seo千里眼
    
				
    這個多線程程序挺實用哦。  回復  更多評論
      
    
			
    
			
			
		
    
	
		
    
			
    
			# re: JAVA NIO 多線程服務器 1.2版
				2011-09-03 16:13 | 阿不都外力
    
				
    收藏一下！以后看。。。  回復  更多評論
      
    
			
    
			
			
		
    
	
		
    
			
    
			# re: JAVA NIO 多線程服務器 1.2版
				2011-09-05 23:54 | 步步為營
    
				
    Tomcat中用NIO比較多，搭建高性能服務器時NIO挺好用的，呵呵  回復  更多評論
      
    
			
    
			
			
		
    
	








    








    

				

    







    







    
        
	



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