Apache mina: IoSession.write(Object msg)剖析

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在apache mina中通过IoSession 写入数据,返回一个Future可以获取写入数据的结果。

NioSocketSession(AbstractIoSession).write(Object)  

NioSocketSession(AbstractIoSession).write(Object, SocketAddress) .IoSession通过FilterChain 过滤链写出数据。

        // Now, we can write the message. First, create a futureWriteFuture writeFuture = new DefaultWriteFuture(this);WriteRequest writeRequest = new DefaultWriteRequest(message, writeFuture, remoteAddress);// Then, get the chain and inject the WriteRequest into itIoFilterChain filterChain = getFilterChain();filterChain.fireFilterWrite(writeRequest);

DefaultIoFilterChain.callPreviousFilterWrite(IoFilterChain$Entry, IoSession, WriteRequest) 

ProtocolCodecFilter.filterWrite(IoFilter$NextFilter, IoSession, WriteRequest)

在ProtocolCodecFilter 中把Object消息编码后,到达HeadFilter中。在HeadFilter中负责把消息写入消息队列中。

    private class HeadFilter extends IoFilterAdapter {@SuppressWarnings("unchecked")@Overridepublic void filterWrite(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) throws Exception {AbstractIoSession s = (AbstractIoSession) session;// Maintain counters.if (writeRequest.getMessage() instanceof IoBuffer) {IoBuffer buffer = (IoBuffer) writeRequest.getMessage();// I/O processor implementation will call buffer.reset()// it after the write operation is finished, because// the buffer will be specified with messageSent event.buffer.mark();int remaining = buffer.remaining();if (remaining > 0) {s.increaseScheduledWriteBytes(remaining);}} else {s.increaseScheduledWriteMessages();}//在HeadFilter中把要写入的消息放在WriteRequestQueueWriteRequestQueue writeRequestQueue = s.getWriteRequestQueue();if (!s.isWriteSuspended()) {if (writeRequestQueue.isEmpty(session)) {

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