PipeImpl解析
程序员文章站
2022-07-13 17:00:18
...
ServerSocketChannel定义:http://donald-draper.iteye.com/blog/2369836
ServerSocketChannelImpl解析:http://donald-draper.iteye.com/blog/2370912
SocketChannelImpl 解析一(通道连接,发送数据):http://donald-draper.iteye.com/blog/2372364
SocketChannelImpl 解析二(发送数据后续):http://donald-draper.iteye.com/blog/2372548
SocketChannelImpl 解析三(接收数据):http://donald-draper.iteye.com/blog/2372590
SocketChannelImpl 解析四(关闭通道等) :http://donald-draper.iteye.com/blog/2372717
Pipe定义:http://donald-draper.iteye.com/blog/2373540
引言:
Pipe中包含一个可写通道SinkChannel和一个可读通道SourceChannel。sink向管道写字节序序列,
source从管道读取字节序列。
我们从Pipe的open方法开始:
这里为什么是SelectorProviderImpl,前面已经说过不在说,
//SelectorProviderImpl
下面来看通道的实现,PipeImpl
从上面可以看出PipeImpl,内部有一个Source通道SourceChannel,Sink通道SinkChannel,一个
随机数rnd(long),还有一个管道初始化Action,初始化时加载net和nio资源库,委托IOUtil产生8个字节,然后根据8个字节生成一个随机数rnd;在构造时,在与当前线程访问控制权限的情况下,执行Initializer,权限动作,执行Initializer的run方法,即通过ServerSocketChannle和SocketChannel建立一个通道连接;首先新建一个ServerSocketChannle和SocketChannel,分别绑定地址SocketChannel向ServerSocetChannel发送随机数rnd,ServerSocetChannel接受SocketChannel连接,产生一个SocketChannel1(server),SocketChannel1接受client(SocketChannel),检验与随机数rnd,相等则建立连接。然后根据SocketChannel1(server),构造Sink通道SinkChannelImpl,根据client(SocketChannel),构造Source通道SourceChannelImpl。
我们先来看SinkChannelImpl
从SinkChannelImpl,可以看出内部关联一个socket通道,SinkChannelImpl关闭通道,配置通道阻塞模式,写字节序列到管道都是委托给内部的SocketChannle。
再看SourceChannelImpl
从SourceChannelImpl,可以看出内部关联一个socket通道,SourceChannelImpl关闭通道,配置通道阻塞模式,从管道读取字节序列都是委托给内部的SocketChannle。
总结:
PipeImpl,内部有一个Source通道SourceChannel,Sink通道SinkChannel,一个随机数rnd(long),还有一个管道初始化Action,初始化时加载net和nio资源库,委托IOUtil产生8个字节,然后根据8个字节生成一个随机数rnd;在构造时,在与当前线程访问控制权限的情况下,执行Initializer,权限动作,执行Initializer的run方法,即通过ServerSocketChannle和SocketChannel建立一个通道连接;首先新建一个ServerSocketChannle和SocketChannel,分别绑定地址SocketChannel向ServerSocetChannel发送随机数rnd,ServerSocetChannel接受SocketChannel连接,产生一个SocketChannel1(server),SocketChannel1接受client(SocketChannel),检验与随机数rnd,相等则建立连接。然后根据SocketChannel1(server),构造Sink通道SinkChannelImpl,根据client(SocketChannel),构造Source通道SourceChannelImpl。
SinkChannelImpl,内部关联一个socket通道,SinkChannelImpl关闭通道,配置通道阻塞模式,写字节序列到管道都是委托给内部的SocketChannle。
SourceChannelImpl,内部关联一个socket通道,SourceChannelImpl关闭通道,配置通道阻塞模式,从管道读取字节序列都是委托给内部的SocketChannle。
ServerSocketChannelImpl解析:http://donald-draper.iteye.com/blog/2370912
SocketChannelImpl 解析一(通道连接,发送数据):http://donald-draper.iteye.com/blog/2372364
SocketChannelImpl 解析二(发送数据后续):http://donald-draper.iteye.com/blog/2372548
SocketChannelImpl 解析三(接收数据):http://donald-draper.iteye.com/blog/2372590
SocketChannelImpl 解析四(关闭通道等) :http://donald-draper.iteye.com/blog/2372717
Pipe定义:http://donald-draper.iteye.com/blog/2373540
引言:
Pipe中包含一个可写通道SinkChannel和一个可读通道SourceChannel。sink向管道写字节序序列,
source从管道读取字节序列。
我们从Pipe的open方法开始:
public static Pipe open() throws IOException { return SelectorProvider.provider().openPipe(); }
这里为什么是SelectorProviderImpl,前面已经说过不在说,
//SelectorProviderImpl
public Pipe openPipe() throws IOException { return new PipeImpl(this); }
下面来看通道的实现,PipeImpl
package sun.nio.ch; import java.io.IOException; import java.net.*; import java.nio.ByteBuffer; import java.nio.channels.*; import java.nio.channels.spi.SelectorProvider; import java.security.*; import java.util.Random; // Referenced classes of package sun.nio.ch: // IOUtil, Util, SinkChannelImpl, SourceChannelImpl class PipeImpl extends Pipe { private java.nio.channels.Pipe.SourceChannel source;//Source通道 private java.nio.channels.Pipe.SinkChannel sink;//Sink通道 private static final Random rnd;// static { //加载net和nio资源库 Util.load(); byte abyte0[] = new byte[8]; //委托IOUtil,获取8个字节序列,static native boolean randomBytes(byte abyte0[]); boolean flag = IOUtil.randomBytes(abyte0); if(flag) rnd = new Random(ByteBuffer.wrap(abyte0).getLong()); else rnd = new Random(); } PipeImpl(SelectorProvider selectorprovider) throws IOException { try { //在与当前线程访问控制权限的情况下,执行Initializer,权限动作,执行Initializer的run方法 AccessController.doPrivileged(new Initializer(selectorprovider)); } catch(PrivilegedActionException privilegedactionexception) { throw (IOException)privilegedactionexception.getCause(); } } //管道初始化Action private class Initializer implements PrivilegedExceptionAction { private final SelectorProvider sp; static final boolean $assertionsDisabled = !sun/nio/ch/PipeImpl.desiredAssertionStatus(); final PipeImpl this$0; private Initializer(SelectorProvider selectorprovider) { this$0 = PipeImpl.this; super(); sp = selectorprovider; } public volatile Object run() throws Exception { return run(); } public Void run() throws IOException { ServerSocketChannel serversocketchannel;//ServerSocket通道, SocketChannel socketchannel;//用于source通道 SocketChannel socketchannel1;//用于Sink通道 serversocketchannel = null; socketchannel = null; socketchannel1 = null; try { //获取本地地址 InetAddress inetaddress = InetAddress.getByName("127.0.0.1"); if(!$assertionsDisabled && !inetaddress.isLoopbackAddress()) throw new AssertionError(); //打开一个ServerSocket通道 serversocketchannel = ServerSocketChannel.open(); //ServerSocket通道绑定地址 serversocketchannel.socket().bind(new InetSocketAddress(inetaddress, 0)); InetSocketAddress inetsocketaddress = new InetSocketAddress(inetaddress, serversocketchannel.socket().getLocalPort()); //打开一个SocketChannel通道 socketchannel = SocketChannel.open(inetsocketaddress); ByteBuffer bytebuffer = ByteBuffer.allocate(8); //获取通道的随机long值 long l = PipeImpl.rnd.nextLong(); bytebuffer.putLong(l).flip(); //向serverSocket通道发送一个long值,即8个字节 socketchannel.write(bytebuffer); do { //serverSocket接受连接 socketchannel1 = serversocketchannel.accept(); bytebuffer.clear(); //接受client通道端发送过来的数据 socketchannel1.read(bytebuffer); bytebuffer.rewind(); if(bytebuffer.getLong() == l) break; socketchannel1.close(); } while(true); //根据client通道,构造SourceChannelImpl source = new SourceChannelImpl(sp, socketchannel); //根据ServerChannel接受连接产生的SocketChannel通道,构造SinkChannelImpl sink = new SinkChannelImpl(sp, socketchannel1); } catch(IOException ioexception1) { try { if(socketchannel != null) socketchannel.close(); if(socketchannel1 != null) socketchannel1.close(); } catch(IOException ioexception2) { } IOException ioexception3 = new IOException("Unable to establish loopback connection"); ioexception3.initCause(ioexception1); throw ioexception3; } try { //关闭serverSocketChannle,任务完成(建立一个SocketChannle连接) if(serversocketchannel != null) serversocketchannel.close(); } catch(IOException ioexception) { } break MISSING_BLOCK_LABEL_277; Exception exception; exception; try { if(serversocketchannel != null) serversocketchannel.close(); } catch(IOException ioexception4) { } throw exception; return null; } } //返回source通道 public java.nio.channels.Pipe.SourceChannel source() { return source; } //返回sink通道 public java.nio.channels.Pipe.SinkChannel sink() { return sink; } }
从上面可以看出PipeImpl,内部有一个Source通道SourceChannel,Sink通道SinkChannel,一个
随机数rnd(long),还有一个管道初始化Action,初始化时加载net和nio资源库,委托IOUtil产生8个字节,然后根据8个字节生成一个随机数rnd;在构造时,在与当前线程访问控制权限的情况下,执行Initializer,权限动作,执行Initializer的run方法,即通过ServerSocketChannle和SocketChannel建立一个通道连接;首先新建一个ServerSocketChannle和SocketChannel,分别绑定地址SocketChannel向ServerSocetChannel发送随机数rnd,ServerSocetChannel接受SocketChannel连接,产生一个SocketChannel1(server),SocketChannel1接受client(SocketChannel),检验与随机数rnd,相等则建立连接。然后根据SocketChannel1(server),构造Sink通道SinkChannelImpl,根据client(SocketChannel),构造Source通道SourceChannelImpl。
我们先来看SinkChannelImpl
package sun.nio.ch; import java.io.FileDescriptor; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.*; import java.nio.channels.spi.SelectorProvider; // Referenced classes of package sun.nio.ch: // SelChImpl, SelectionKeyImpl, SelectorImpl, SocketChannelImpl, // Util class SinkChannelImpl extends java.nio.channels.Pipe.SinkChannel implements SelChImpl { SocketChannel sc;//关联socket通道 public FileDescriptor getFD() { return ((SocketChannelImpl)sc).getFD(); } public int getFDVal() { return ((SocketChannelImpl)sc).getFDVal(); } SinkChannelImpl(SelectorProvider selectorprovider, SocketChannel socketchannel) { super(selectorprovider); sc = socketchannel; } //关闭通道 protected void implCloseSelectableChannel() throws IOException { //通道没有注册到任何选择器 if(!isRegistered()) kill(); } //关闭socket通道 public void kill() throws IOException { sc.close(); } //配置阻塞模式 protected void implConfigureBlocking(boolean flag) throws IOException { sc.configureBlocking(flag); } //写字节序列 public int write(ByteBuffer bytebuffer) throws IOException { return sc.write(bytebuffer); AsynchronousCloseException asynchronouscloseexception; asynchronouscloseexception; close(); throw asynchronouscloseexception; } public long write(ByteBuffer abytebuffer[]) throws IOException { return sc.write(abytebuffer); AsynchronousCloseException asynchronouscloseexception; asynchronouscloseexception; close(); throw asynchronouscloseexception; } public long write(ByteBuffer abytebuffer[], int i, int j) throws IOException { if(i < 0 || j < 0 || i > abytebuffer.length - j) throw new IndexOutOfBoundsException(); return write(Util.subsequence(abytebuffer, i, j)); AsynchronousCloseException asynchronouscloseexception; asynchronouscloseexception; close(); throw asynchronouscloseexception; } //设置就绪操作事件 public boolean translateAndSetReadyOps(int i, SelectionKeyImpl selectionkeyimpl) { return translateReadyOps(i, 0, selectionkeyimpl); } //更新就绪操作事件 public boolean translateAndUpdateReadyOps(int i, SelectionKeyImpl selectionkeyimpl) { return translateReadyOps(i, selectionkeyimpl.nioReadyOps(), selectionkeyimpl); } public boolean translateReadyOps(int i, int j, SelectionKeyImpl selectionkeyimpl) { int k = selectionkeyimpl.nioInterestOps(); int l = selectionkeyimpl.nioReadyOps(); int i1 = j; //就绪事件为读1写4连接8,接受连接事件16,不是这四种事件,则抛出Error if((i & 32) != 0) throw new Error("POLLNVAL detected"); //为8+16,接受连接,并建立连接,设置就绪事件k if((i & 24) != 0) { i1 = k; selectionkeyimpl.nioReadyOps(i1); return (i1 & ~l) != 0; } if((i & 4) != 0 && (k & 4) != 0) i1 |= 4;//写操作 selectionkeyimpl.nioReadyOps(i1); return (i1 & ~l) != 0; } //设置兴趣操作事件 public void translateAndSetInterestOps(int i, SelectionKeyImpl selectionkeyimpl) { if((i & 4) != 0) i = 4;//写事件 selectionkeyimpl.selector.putEventOps(selectionkeyimpl, i); } }
从SinkChannelImpl,可以看出内部关联一个socket通道,SinkChannelImpl关闭通道,配置通道阻塞模式,写字节序列到管道都是委托给内部的SocketChannle。
再看SourceChannelImpl
class SourceChannelImpl extends java.nio.channels.Pipe.SourceChannel implements SelChImpl { SocketChannel sc; public FileDescriptor getFD() { return ((SocketChannelImpl)sc).getFD(); } public int getFDVal() { return ((SocketChannelImpl)sc).getFDVal(); } SourceChannelImpl(SelectorProvider selectorprovider, SocketChannel socketchannel) { super(selectorprovider); sc = socketchannel; } //关闭通道 protected void implCloseSelectableChannel() throws IOException { //通道没有注册到任何选择器 if(!isRegistered()) kill(); } //关闭socket通道 public void kill() throws IOException { sc.close(); } //配置阻塞模式 protected void implConfigureBlocking(boolean flag) throws IOException { sc.configureBlocking(flag); } //读取字节序列 public int read(ByteBuffer bytebuffer) throws IOException { return sc.read(bytebuffer); AsynchronousCloseException asynchronouscloseexception; asynchronouscloseexception; close(); throw asynchronouscloseexception; } public long read(ByteBuffer abytebuffer[], int i, int j) throws IOException { if(i < 0 || j < 0 || i > abytebuffer.length - j) throw new IndexOutOfBoundsException(); return read(Util.subsequence(abytebuffer, i, j)); AsynchronousCloseException asynchronouscloseexception; asynchronouscloseexception; close(); throw asynchronouscloseexception; } public long read(ByteBuffer abytebuffer[]) throws IOException { return sc.read(abytebuffer); AsynchronousCloseException asynchronouscloseexception; asynchronouscloseexception; close(); throw asynchronouscloseexception; } //设置就绪操作事件 public boolean translateAndSetReadyOps(int i, SelectionKeyImpl selectionkeyimpl) { return translateReadyOps(i, 0, selectionkeyimpl); } //更新就绪操作事件 public boolean translateAndUpdateReadyOps(int i, SelectionKeyImpl selectionkeyimpl) { return translateReadyOps(i, selectionkeyimpl.nioReadyOps(), selectionkeyimpl); } public boolean translateReadyOps(int i, int j, SelectionKeyImpl selectionkeyimpl) { int k = selectionkeyimpl.nioInterestOps(); int l = selectionkeyimpl.nioReadyOps(); int i1 = j; //就绪事件为读1写4连接8,接受连接事件16,不是这四种事件,则抛出Error if((i & 32) != 0) throw new Error("POLLNVAL detected"); //为8+16,接受连接,并建立连接,设置就绪事件k if((i & 24) != 0) { i1 = k; selectionkeyimpl.nioReadyOps(i1); return (i1 & ~l) != 0; } if((i & 1) != 0 && (k & 1) != 0) i1 |= 1;//读事件 selectionkeyimpl.nioReadyOps(i1); return (i1 & ~l) != 0; } //设置兴趣操作事件 public void translateAndSetInterestOps(int i, SelectionKeyImpl selectionkeyimpl) { if((i & 1) != 0) i = 1;//读事件 selectionkeyimpl.selector.putEventOps(selectionkeyimpl, i); } }
从SourceChannelImpl,可以看出内部关联一个socket通道,SourceChannelImpl关闭通道,配置通道阻塞模式,从管道读取字节序列都是委托给内部的SocketChannle。
总结:
PipeImpl,内部有一个Source通道SourceChannel,Sink通道SinkChannel,一个随机数rnd(long),还有一个管道初始化Action,初始化时加载net和nio资源库,委托IOUtil产生8个字节,然后根据8个字节生成一个随机数rnd;在构造时,在与当前线程访问控制权限的情况下,执行Initializer,权限动作,执行Initializer的run方法,即通过ServerSocketChannle和SocketChannel建立一个通道连接;首先新建一个ServerSocketChannle和SocketChannel,分别绑定地址SocketChannel向ServerSocetChannel发送随机数rnd,ServerSocetChannel接受SocketChannel连接,产生一个SocketChannel1(server),SocketChannel1接受client(SocketChannel),检验与随机数rnd,相等则建立连接。然后根据SocketChannel1(server),构造Sink通道SinkChannelImpl,根据client(SocketChannel),构造Source通道SourceChannelImpl。
SinkChannelImpl,内部关联一个socket通道,SinkChannelImpl关闭通道,配置通道阻塞模式,写字节序列到管道都是委托给内部的SocketChannle。
SourceChannelImpl,内部关联一个socket通道,SourceChannelImpl关闭通道,配置通道阻塞模式,从管道读取字节序列都是委托给内部的SocketChannle。
下一篇: FileChannel示例