源码分析

1. Overview 2. Boss-array initialization 3. Worker-array initialization 4. Bind

Historical Netty source-analysis summary diagrams

1. What off-heap memory is 2. NIO off-heap memory 3. Netty off-heap memory 4. References

NioEventLoopGroup class hierarchy, constructor chain, initialization of selector/select strategy/rejection policy, EventLoop count, executor, child EventLoops, and chooser.

1. Code to analyze 2. Create ServerBootstrap 3. Set ServerBootstrap properties 4. ReflectiveChannelFactory

1. Code to analyze 2. Server binds the port

1. Set a breakpoint 2. New connection enters

1. When pipeline is created 2. What pipeline looks like 3. Tail and Head

bind, channelFactory, and creation of NioServerSocketChannel

1. Code to analyze 2. Create the thread factory 3. Create the executor

1. Code to analyze 2. NioSocketChannel constructor

1. Add a handler 2. Remove a handler

Call path and ServerBootstrap.init

1. Code to analyze 2. Parameters passed to NioEventLoop 3. NioEventLoop is a single-threaded thread pool 4. Constructor

1. Code to analyze 2. Propagate through the pipeline 3. Pass through ServerBootstrapAcceptor 4. Analyze channelRead

Call path and event-loop registration

1. Code to analyze 2. Set a breakpoint and connect with nc 3. Propagate channelActive 4. Reach HeadContext 5. Read through AbstractUnsafe

Call path, AbstractBootstrap, AbstractUnsafe, and AbstractNioChannel

Historical server-startup diagram

Instantiate NioServerSocketChannel through reflection, configure it as non-blocking, and create channelId, Unsafe, and pipeline.

1. Code to analyze. 1.1. How NioEventLoop executes the Runnable. 1.2. What the bind task executed by NioEventLoop does, including JDK NIO bind, channelActive propagation, and registering interest in accept events.

1. Add handlers for the experiment 2. Start from the pipeline 3. Forward through AbstractChannelHandlerContext 4. Enter HeadContext 5-8. Traverse inbound handlers to TailContext

Data structure, API, class hierarchy, and classification

1. Code to analyze 2. Obtain the channel pipeline and add a ChannelInitializer

Code analysis of the NioEventLoop run loop: select, selector rebuild, selected-key optimization, processSelectedKeys, and asynchronous task execution.

1. Add handlers for the experiment 2. Start from the pipeline 3. Enter TailContext 4-7. Traverse outbound handlers back to HeadContext

ByteBufAllocator class hierarchy, AbstractByteBufAllocator, unpooled allocation, and pooled allocation

Select a NioEventLoop, create a ChannelPromise/Future, register the channel through Unsafe with the JDK NIO selector, and invoke handlerAdded/initChannel callbacks.

1. Prepare experiment data 2. Start debugging 3-7. Propagate the exception through handlers to TailContext

Historical example of allocating, reading, writing, and releasing a pooled direct ByteBuf

1. Channel class hierarchy 2. Config class hierarchy

newDirectBuffer, PoolThreadLocalCache, PoolThreadCache, and PoolArena

Constructor and the tiny, small, and normal MemoryRegionCache groups