public interface Callback {
    void onResult();

    void onError(IntegrationException e);
}

public interface TaskExecutor {

	/**
	 * Enqueue task for execution and asynchronously pass result or error to specified callback.
	 */
    void submitTask(String taskName, Callback c);
}

Please implement following method that have to execute task synchronously:

public void executeTaskSynchronously(String taskName, TaskExecutor taskExecutor) throws IntegrationException {
	...
}