mina中对心跳包的支持

在filter包下有个原生态支持，只需实现接口KeepAliveMessageFactory即可。

但是还是有些不算问题的问题，比如在运行时手动设置空闲时间限制，那么会和KeepAliveFilter相互干扰。

 

例子和源码相对简单，这里贴一个毫无意义的实现，以作参考。

public class KeepAliveTestServer {
	public static void main(String[] args) throws IOException {
		IoAcceptor acceptor = new NioSocketAcceptor();
		
		KeepAliveFilter keepAliveFilter = new KeepAliveFilter(new KeepAliveMessageImpl());
		keepAliveFilter.setForwardEvent(false);
		keepAliveFilter.setRequestInterval(30);
		keepAliveFilter.setRequestTimeout(10);
		keepAliveFilter.setRequestTimeoutHandler(new KeepAliveRequestTimeoutHandler() {

			public void keepAliveRequestTimedOut(KeepAliveFilter filter, IoSession session) throws Exception {
				System.out.println("连接已无响应...关闭session鸟。KeepAliveRequestTimeoutHandler.CLOSE 和我作用一样，默认就是这个");
				session.close(true);
			}
			
		});

		acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory()));
		acceptor.getFilterChain().addLast("KeepAlive", keepAliveFilter);
		acceptor.getFilterChain().addLast("log", new LoggingFilter());
		acceptor.setHandler(new IoHandlerAdapter());
		
		
		acceptor.bind(new InetSocketAddress(13665));
	}
	
	
	static class KeepAliveMessageImpl implements KeepAliveMessageFactory {
		private static final String KAMSG_REQ = "###$$$";
		private static final String KAMSG_REP = "$$$###";
		
		public Object getRequest(IoSession session) {
			return KAMSG_REQ;
		}

		public Object getResponse(IoSession session, Object request) {
			return KAMSG_REP;
		}

		public boolean isRequest(IoSession session, Object message) {
			return KAMSG_REQ.equals(message);
		}

		public boolean isResponse(IoSession session, Object message) {
			return KAMSG_REP.equals(message);
		}
	}
}