apache mina: IoSession结构剖析

最新推荐文章于 2017-04-07 09:47:43 发布

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Apache MINA中的IoSession使用DefaultWriteRequestQueue和ConcurrentLinkedQueue实现写请求队列。IoSessionDataStructureFactory接口定义了获取AttributeMap和WriteRequestQueue的方法，而DefaultIoSessionDataStructureFactory类则提供了具体的实现，包括使用DefaultIoSessionAttributeMap存储属性和使用ConcurrentLinkedQueue实现的DefaultWriteRequestQueue来处理写请求。

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NioSocketSession(NioSession).<init>(IoProcessor<NioSession>, IoService, Channel)
NioSocketSession.<init>(IoService, IoProcessor<NioSession>, SocketChannel)
NioSocketAcceptor.accept(IoProcessor<NioSession>, ServerSocketChannel)
NioSocketAcceptor.accept(IoProcessor, Object)
AbstractPollingIoAcceptor$Acceptor.processHandles(Iterator<H>)
AbstractPollingIoAcceptor$Acceptor.run()

public abstract class NioSession extends AbstractIoSession {

/** An id generator guaranteed to generate unique IDs for the session */

private static AtomicLong idGenerator = new AtomicLong(0);

/** The FilterChain created for this session */
private final IoFilterChain filterChain;
/**
*
* Creates a new instance of NioSession, with its associated IoProcessor.
* <br>
* This method is only called by the inherited class.
*
* @param processor The associated IoProcessor
*/
protected NioSession(IoProcessor<NioSession> processor, IoService service, Channel channel) {
super(service);
this.channel = channel;
this.processor = processor;
filterChain = new DefaultIoFilterChain(this);
// Set a new ID for this session
sessionId = idGenerator.incrementAndGet();
}
}
在创建IoSession时,每一个IoSession都有自己独立的DefaultIoFilterChain。
在IoSession中有2个重要的成员变量。DefaultIoSessionAttributeMap 是通过ConcurrentHashMap实现的。

DefaultWriteRequestQueue是通过ConcurrentLinkedQueue实现的。

Provides data structures to a newly created session.

public interface IoSessionDataStructureFactory
{
IoSessionAttributeMap getAttributeMap(IoSession session) throws Exception;
WriteRequestQueue getWriteRequestQueue(IoSession session) throws Exception;
}

public class DefaultIoSessionDataStructureFactory implements IoSessionDataStructureFactory {

public IoSessionAttributeMap getAttributeMap(IoSession session) throws Exception {
return new DefaultIoSessionAttributeMap();
}

public WriteRequestQueue getWriteRequestQueue(IoSession session) throws Exception {
return new DefaultWriteRequestQueue();
}
}

private static class DefaultIoSessionAttributeMap implements IoSessionAttributeMap {
private final ConcurrentHashMap<Object, Object> attributes = new ConcurrentHashMap<Object, Object>(4);
}

private static class DefaultWriteRequestQueue implements WriteRequestQueue {
/** A queue to store incoming write requests */
private final Queue<WriteRequest> q = new ConcurrentLinkedQueue<WriteRequest>();
}