Java nio 的线程通信机制线程通信Pipe

Java的Pipe是一种新的线程通信机制，传统的线程通信可以是通过共享内存的方式，socket等方式，而Pipe是通过Java NIO 通信的方式实现共享内存，优点类似于go语言的管道

先上代码

    public static void main(String[] args) throws IOException {Pipe open = Pipe.open();Pipe.SinkChannel sinkChannel = open.sink();ByteBuffer byteBuffer = ByteBuffer.allocateDirect(32);byteBuffer.clear();byteBuffer.put("你好 pipe".getBytes());byteBuffer.flip();sinkChannel.write(byteBuffer);Pipe.SourceChannel source = open.source();ByteBuffer byteBuffer1 = ByteBuffer.allocateDirect(32);source.read(byteBuffer1);}

这段代码我没有开启多线程读写

只讲底层实现

首先 SinkChannel 和 SourceChannel 是两个内部类 这个两个类都有一个SocketChannel 

但是SinkChannel只提供了写方法 SourceChannel提供了读方法，相当于是对原始SocketChannel的一个封装，使其达到了一个SocketChannel 只能读一个SocketChannel 只能写的效果。所以就可以做到线程间通信

  ServerSocketChannel var1 = null;SocketChannel var2 = null;SocketChannel var3 = null;try {ByteBuffer var4 = ByteBuffer.allocate(16);ByteBuffer var5 = ByteBuffer.allocate(16);InetAddress var6 = InetAddress.getByName("127.0.0.1");assert var6.isLoopbackAddress();InetSocketAddress var7 = null;while(true) {if (var1 == null || !var1.isOpen()) {var1 = ServerSocketChannel.open();var1.socket().bind(new InetSocketAddress(var6, 0));var7 = new InetSocketAddress(var6, var1.socket().getLocalPort());}var2 = SocketChannel.open(var7);PipeImpl.RANDOM_NUMBER_GENERATOR.nextBytes(var4.array());do {var2.write(var4);} while(var4.hasRemaining());var4.rewind();var3 = var1.accept();do {var3.read(var5);} while(var5.hasRemaining());var5.rewind();if (var5.equals(var4)) {PipeImpl.this.source = new SourceChannelImpl(Initializer.this.sp, var2);PipeImpl.this.sink = new SinkChannelImpl(Initializer.this.sp, var3);break;}var3.close();var2.close();}

首先初始化一个ServerSocketChannel 然后绑定本地回环地址分配端口号

然后var2通过Open和ServerSocketChannel进行连接 ，紧接着var3通过acceept的方式来接受连接。如此这两个SocketChannel通过ServerSocketChannel建立了连接从而实现了跨线程通信。

而且通信底层使用了直接内存效率会高一些

而且SocketChannel还可以是非阻塞的