Java: Async IO

[Navin Math]

Hi

I wanted to understand the how to do non-blocking I/O.

I have login API:

public static Promise<Result> login() {

Logger.debug("Application.login()-------------- >");

Promise<String> promiseOfJson = Promise.promise(

new Function0<String>() {

@Override

public String apply() throws Throwable {

return loginService();

}

}

);

return after(promiseOfJson);

}

loginService() {

// Now this function calls other server to authenticate the credentials.. username and password, 

// the function call loginAuthenticateServer

Promise<JsonNode> promise = loginAuthenticateServer();

// now I need to wait here until I get the data

My Questions are:

DO I need to call wait() or get() on the promise

Is it correct way of doing Async IO

 

}

public static Promise<JsonNode> loginAuthenticateServer(String serverUrl, JsonNode requestBodyJson) {

Promise<WSResponse> response = WS.url(serverUrl)

.setContentType(RequestConstants.REQUEST_CONTENT_TYPE_JSON)

.post(requestBodyJson);

return response.map(new Function<WSResponse, JsonNode>() {

@Override

public JsonNode apply(WSResponse wsResponse) throws Throwable {

return wsResponse.asJson();

}

});

}