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When you are building your website or application with Java, you can use the Cleeng Java SDK. It simplifies the use of the Cleeng API as it handles user login and content access, and deals with all JSON-RPC specific code.

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package com.cleeng.api;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.asynchttpclient.AsyncHttpClient;
import org.asynchttpclient.Response;

import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;

public class AsyncRequestCallback extends CompletableFuture {

    private static final Logger logger = LogManager.getLogger(AsyncRequestCallback.class);

    protected Gson gson;

    public AsyncRequestCallback(Class responseClass) {
        this.gson = new GsonBuilder().create();
        this._responseClass = responseClass;
    }

    private AsyncHttpClient _client;

    public void setClient(AsyncHttpClient client) {
        this._client = client;
    }

    private CountDownLatch _countdownLatch;

    public void setCountdownLatch(CountDownLatch latch) {
        this._countdownLatch = latch;
    }

    public CountDownLatch getCountdownLatch() {
        return this._countdownLatch;
    }

    protected String _response;

    protected Class _responseClass;

    public T getResponse() {
        return gson.fromJson( this._response, this._responseClass );
    }

    @Override
    public boolean complete(final Response response) {
        final boolean out = super.complete(response);
        logger.info("Completed async request: " + response.getStatusCode() + " count: " + this._countdownLatch.getCount() + " response: " + this._responseClass.getCanonicalName());
        try {
            this._response = response.getResponseBody();
        } catch (Exception e) {

        }
        if (this.useNonBlockingMode == true) {
            if (this._countdownLatch.getCount() == 0) {
                try {
                    logger.info("Closing connection...");
                    this._client.close();
                } catch (IOException e) {
                    logger.error("Failed to close http connection...");
                }
            }
        }
        this._countdownLatch.countDown();
        return out;
    }

    @Override
    public boolean completeExceptionally(Throwable ex) {
        logger.error("Request completed with exception " + ex);
        return super.completeExceptionally(ex);
    }

    public boolean useNonBlockingMode = false;
}