Making the StackMob Java Client SDK do a synchronous get call

gistfile1.java

package my.package

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.TimeUnit;
import java.util.Map;
import java.util.HashMap;

long requestTimeout = 5;
TimeUnit requestTimeoutUnit = TimeUnit.SECONDS;//wait max 5 seconds for StackMob requests to return. if longer, fail

CountDownLatch latch = new CountDownLatch(1);
AtomicReference<String> successBody = new AtomicReference<String>();
AtomicReference<StackMobException> failedException = new AtomicReference<StackMobException>();

Map<String, String> args = new HashMap<String, String>();
args.put("username", "johndoe");
//the success or failure function gets executed in a background thread.
//the CountDownLatch is what allows the background thread to communicate with
//the main thread
stackmob.get("user", args, new StackMobCallback() {
	@Override
	public void success(String responseBody) {
		successBody.set(responseBody);
		latch.countDown();
	}
	
	@Override
	public void failure(StackMobException e) {
		failedException.set(e);
		latch.countDown();
	}
});

//this line waits for the background thread (which executes the methods inside the StackMobCallback)
//to complete
if(latch.await(requestTimeout, requestTimeoutUnit)) {
	//the request came back in time
	if(successBody.get() != null) {
		//do something with the success response. successBody.get() will return the response body from StackMob, as a String.
                doSomething(successBody.get());
	} else if(failedException.get() != null) {
		//if failedException.get() was set, then something in the request failed.
		throw failedException.get();
	} else {
		//neither the success or failure methods were called in the StackMobCallback above.
		//this should never happen. if it does, it is a bug in the StackMob Java Client SDK.
		//please tell us about it at support@stackmob.com.
		throw new Exception("bug in StackMob Java client SDK found - neither success nor failure were called in StackMobCallback");
	}
} else {
	//the request did not come back in time
	throw new Exception(String.format("the request to StackMob did not return within %d %s", requestTimeout, requestTimeoutUnit.toString.toLowerCase))
}