claytang 2013-05-06
我们知道,在MINA2中,发送和接受时两个独立的工作线程,但是可以设置一个参数,当服务端发送消息之后同步读取客户端的返回:
session.getConfig().setUseReadOperation(true);
近日,采用MINA2(RC)的同步读取方法,发现无法真的同步读取客户端的返回;
场景是:服务端发送一个消息给客户端,需要同步等待客户端的一个消息回执,然后服务端的程序继续执行;
sendSession.getConfig().setUseReadOperation(true); WriteFuture future = sendSession.write(xmlMsgBean); // 发送数据 future.awaitUninterruptibly(); // 等待发送数据操作完成 if (future.getException() != null) { throw new AppException(future.getException().getMessage()); } if (future.isWritten()) { // 数据已经被成功发送 logger.debug("数据已经被成功发送"); ReadFuture readFuture = sendSession.read(); readFuture.awaitUninterruptibly(); if (readFuture.getException() != null) { throw new AppException(readFuture.getException().getMessage()); } sendSession.getConfig().setUseReadOperation(false); return ((XmlMsgBean) readFuture.getMessage()).getStrErrMsg(); } else { // 数据发送失败 logger.debug("数据发送失败"); }
后来用GOOGLE搜索了一下,发现在MINA的官网上,老外同样问了一个一模一样的问题,并且提了一个BUG上去,但是目前BUG的状态还是open;
https://issues.apache.org/jira/browse/DIRMINA-777
I'm attempting to perform a synchronous write/read in a demux-based client application with MINA 2.0 RC1, but it seems to get stuck. Here is my code: {code} public boolean login(final String username, final String password) { // block inbound messages session.getConfig().setUseReadOperation(true); // send the login request final LoginRequest loginRequest = new LoginRequest(username, password); final WriteFuture writeFuture = session.write(loginRequest); writeFuture.awaitUninterruptibly(); if (writeFuture.getException() != null) { session.getConfig().setUseReadOperation(false); return false; } // retrieve the login response final ReadFuture readFuture = session.read(); readFuture.awaitUninterruptibly(); if (readFuture.getException() != null) { session.getConfig().setUseReadOperation(false); return false; } // stop blocking inbound messages session.getConfig().setUseReadOperation(false); // determine if the login info provided was valid final LoginResponse loginResponse = (LoginResponse)readFuture.getMessage(); return loginResponse.getSuccess(); } {code} I can see on the server side that the LoginRequest object is retrieved, and a LoginResponse message is sent. On the client side, the DemuxingProtocolCodecFactory receives the response, but after throwing in some logging, I can see that the client gets stuck on the call to `readFuture.awaitUninterruptibly() `. I can't for the life of me figure out why it is stuck here based upon my own code. I properly set the read operation to true on the session config, meaning that messages should be blocked. However, it seems as if the message no longer exists by time I try to read response messages synchronously.
Key: DIRMINA-777
Type: Bug
Status: Open
Priority: Blocker
Assignee: Unassigned
Reporter: Matt Huggins
Votes: 0
Watchers: 0