老猿说说专栏

NIO闲聊 自从JAVA1.4推出NIO起，JAVA网络编程进入了一个全新的时代，传统网络IO（OIO）是傻等式的，一旦IO操作发起，那么用户线程就陷入很傻很天真的等待中，直到IO操作结束或者发生了断连，而NIO则要聪明许多是事件触发式的，只有当前有IO事件发生了，才会通知用户线程执行IO操作，当前操作结束之后不会阻塞等待可以执行其他的业务操作等待下一次事件，就好比上银行取钱，一种方式排队傻

NioEventLoop.run() @Override protected void run() { for (;;) { try { switch (selectStrategy.calculateStrategy(selectNowSupplier, hasTasks())) { ...

IdleStateHandler public class IdleStateHandler extends ChannelDuplexHandler { // Not create a new ChannelFutureListener per write operation to reduce GC pressure. private final ChannelFutureL...

public HttpPostMultipartRequestDecoder(HttpDataFactory factory, HttpRequest request, Charset charset) { this.request = checkNotNull(request, "request"); this.charset = checkNotNull(ch...

@Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { boolean release = true; try { if (acceptInboundMessage(msg)) { ...

TailContext // A special catch-all handler that handles both bytes and messages. final class TailContext extends AbstractChannelHandlerContext implements ChannelInboundHandler { TailCont...

write @Override public final void write(Object msg, ChannelPromise promise) { assertEventLoop(); ChannelOutboundBuffer outboundBuffer = this.outboundBuffer; ...

512以下是16的倍数 2的9次 以上每次*2 一共2的18次 最大262144=256k static final int DEFAULT_MINIMUM = 64; static final int DEFAULT_INITIAL = 1024; static final int DEFAULT_MAXIMUM = 65536; private static...

HttpPostMultipartRequestExDecoder.getFileUpload if(size == 0 && requestContentLength > CustomDiskFileUpload.DISK_FILE_THRESHOLD) { LOGGER.info("request content length:{}, ...

runAllTasks() /** * Poll all tasks from the task queue and run them via {@link Runnable#run()} method. This method stops running * the tasks in the task queue and returns if it ran longer ...

MultithreadEventExecutorGroup shutdownGracefully() DEFAULT_SHUTDOWN_QUIET_PERIOD = 2L DEFAULT_SHUTDOWN_TIMEOUT = 15L @Override public Future<?> shutdownGracefully(long quietPeriod, long ...

protected AbstractChannel(Channel parent) { this.parent = parent; id = newId(); unsafe = newUnsafe(); pipeline = newChannelPipeline(); } @Override publ...

    1. 连接篇 1.1 Netty Native Netty Native用C++编写JNI调用的Socket Transport，是由Twitter将Tomcat Native的移植过来，现在还时不时和汤姆家同步一下代码。 经测试，的确比JDK NIO更省CPU。 也许有人问，JDK的NIO也用EPOLL啊，大家有什么不同？ Norman Maurer这么说的：  Net...

AbstractNioByteChannel.read() @Override public final void read() { final ChannelConfig config = config(); final ChannelPipeline pipeline = pipeline(); final...

DefaultChannelPipeline.flush() 调用unsafe @Override public void flush(ChannelHandlerContext ctx) throws Exception { unsafe.flush(); } AbstractChannel.flush() 调用outboundbuffer.addFlush 然后flush0,...

AbstractChannelHandlerContext.writeAndFlush @Override public ChannelFuture writeAndFlush(Object msg, ChannelPromise promise) { if (msg == null) { throw new NullPointerExcepti...

NioSocketChannel.doWrite(ChannelOutboundBuffer in) } else if (msg instanceof FileRegion) { FileRegion region = (FileRegion) msg; boolean done = region.transferred() >= region.count()...

ChunkedStream @Override public boolean isEndOfInput() throws Exception { if (closed) { return true; } int b = in.read(); if (b < 0) { r...

HttpObjectDecoder skipControlCharacters()-> State.READ_INITIAL->lineParser.parse(buffer) ->READ_HEADER @Override protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List&lt...

Recycler 初始化 maxCapacityPerThread=32768 maxSharedCapacityFactor=2 maxDelayedQueuesPerThread=6 ratioMask=7 protected Recycler() { this(DEFAULT_MAX_CAPACITY_PER_THREAD);//32768 } p...