I'm writing a android chat application with socket.io-client-java.I want to
check whether the client user exist at first.So I need to send a command
like "user/exist" to server url and get the response from server.I need to
wait the server response then can go to next step.But the socket.io use the
asynchronous callback.For getting the response synchronous I known the
Furture and Callable only.So I tried the way using code as below:But it
dose not work.The respObj is null. How can i get the reponse synchronous? I
am a green hand on java and forgive my poor chinese english. Any help would
be appreciated!
//this is request method using socket.iopublic JSONObject request(final String
method,final String url,final JSONObject data){
final JSONObject responseObj = new JSONObject();
if (mSocket.connected()) {
mSocket.emit(method, reqObj, new Ack() {
@Override
public void call(Object... objects) {
System.out.println("get Ack");
try {
responseObj.put("body", (JSONObject) objects[0]);
}catch (JSONException e){
e.printStackTrace();
}
}
})
}}//this is Callable call implement
@Override
public JSONObject call(){
return request("get","https://my-chat-server/user/exist",new
JSONObject());}
//this is call method in activity
ExecutorService executor = Executors.newCachedThreadPool();
Future<JSONObject> response = executor.submit(mApiSocket);
executor.shutdown();
JSONObject respObj = new JSONObject();
JSONObject respBody = new JSONObject();
try {
respObj = response.get();
respBody = respObj.getJSONObject("body");
}catch (ExecutionException e){
}catch(InterruptedException e1){
}catch(JSONException e2){
}
And I known the js can use Promise and await like below:
//request methodstatic request(method, url, data) {
return new Promise((resolve, reject) => {
this.socket.emit(method,
{
url: url,
method,
data,
},
async (res) => {
if (res.statusCode == 100) {
resolve(res.body, res);
} else {
throw new Error(`${res.statusCode} error: ${res.body}`);
reject(res.body, res);
}
}
)
})
}//call method
response = await mSocket.request('get','https://my-chat-server/user/exist', {
first_name: 'xu',
last_name: 'zhitong',
});
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