我使用Bidirectional Streaming使用了Grpc的{{1}}概念。
以下是我的代码
Async stub现在一切正常。.我可以使用已建立的流来ping / pong服务器/客户端。但是，当我关闭服务器，并从客户端发出流请求时，它将等待无限。我除了抛出@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnOnline = (Button) findViewById(R.id.btnOnline);
btnOffline = (Button) findViewById(R.id.btnOffline);
btnAcceptRide = (Button) findViewById(R.id.btnAcceptRide);
btnCancelRide = (Button) findViewById(R.id.btnCancelRide);
txtCode = (EditText) findViewById(R.id.txtCode);
txtReply = (TextView) findViewById(R.id.txtReply);
ClientConnState = 0;
btnOnline.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new GrpcTask().execute();
}
});
private class GrpcTask extends AsyncTask<Void, Void, String> {
private String mHost;
private String mMessage;
private int mPort;
private ManagedChannel mChannel;
@Override
protected void onPreExecute() {
mHost = "localhost";
mPort = 8080;
mChannel = ManagedChannelBuilder.forAddress("192.168.0.102", 50049)
.usePlaintext(true)
.build();
blockingStub = bidirectionalserviceGrpc.newBlockingStub(mChannel);
asyncStub = bidirectionalserviceGrpc.newStub(mChannel);
}
@Override
protected String doInBackground(Void... nothing) {
try {
final CountDownLatch countDownLatch = new CountDownLatch(1);
requestStreamObserver = asyncStub.requestRide(new StreamObserver<Bidirectional.RideReply>() {
@Override
public void onNext(Bidirectional.RideReply value) {
if (countDownLatch.getCount() > 0) {
countDownLatch.countDown();
}
}
@Override
public void onError(Throwable t) {
countDownLatch.countDown();
}
@Override
public void onCompleted() {
countDownLatch.countDown();
}
});
Bidirectional.RideRequest rideRequest = Bidirectional.RideRequest.newBuilder()
.setRequestid(1)
.setDrivercode(txtCode.getText().toString())
.build();
requestStreamObserver.onNext(rideRequest);
if (!countDownLatch.await(15, TimeUnit.SECONDS)) {
throw new RuntimeException(
"Could not finish rpc within 1 minute, the server is likely down");
}
return "completed";
} catch (Exception e) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
pw.flush();
return "Failed... : " + System.lineSeparator() + sw;
}
}
@Override
protected void onPostExecute(String result) {
Log.e(logger.getName(), result);
}
}
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// Write Logic here
super.handleMessage(msg);
}
};
事件外，其他都没有。
有人可以帮我解决这个问题吗？
答案 0 :(得分：1)
根据服务器关闭的方式以及客户端的操作，TCP可能不会发现连接中断。您应该在keepAliveTime()上启用ManagedChannelBuilder。 Javadoc应该可以帮助您入门，如果您感兴趣，A8-client-side-keepalive.md将提供更多信息。
您可能还希望启用idleTimeout()。