mina中對心跳包的支持

在filter包下有個原生態支持，只需實現接口KeepAliveMessageFactory即可。

但是還是有些不算問題的問題，比如在運行時手動設置空閒時間限制，那麼會和KeepAliveFilter相互干擾。

 

例子和源碼相對簡單，這裏貼一個毫無意義的實現，以作參考。

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("連接已無響應...關閉session鳥。KeepAliveRequestTimeoutHandler.CLOSE 和我作用一樣，默認就是這個");
				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);
		}
	}
}