仅在结果状态完成时才执行CompletableFuture回调

Question

I am currently working with the Zendesk API and creating users. I am using the CompletableFuture framework to perform the operation of creating the users and then adding a callback to handle the result. However, the result of the createUsers() method is a JobStatus object that could have the status of "queued", "completed", "working". What I would like is for the callback to be executed only when the status is "completed". Is this possible? If the status is "queued", I want it to keep waiting until the result is "completed".

For this example, assume that the list contains a set of users to be created.

public void createEndUsers(Zendesk zd, List<User> usersToBeCreated){
    final static CompletableFuture<JobStatus<User>> promise = new CompletableFuture<>();

    promise.supplyAsync(() -> {
            JobStatus<User> js = zd.createUsers(usersToBeCreated);
            return js;
        }).thenAccept(Testing::updateDB);
}

public void updateDB(JobStatus<User> resultObject){
    //perform various operations on the JobStatus object
}

Answer 1

If you would be using the code:

private static final int DELAY = 100;
public void createEndUsers(Zendesk zd, List<User> usersToBeCreated){
    final CompletableFuture<JobStatus<User>> promise = new CompletableFuture<>();

    promise.supplyAsync(() -> {
        JobStatus<User> js = zd.createUsers(usersToBeCreated);
        JobStatus.JobStatusEnum jsStatus = js.getStatus();

        while (jsStatus == JobStatus.JobStatusEnum.working || jsStatus == JobStatus.JobStatusEnum.queued){
            try{
                Thread.sleep(DELAY);
            } catch(InterruptedException e){
                throw new RuntimeException("Interrupted exception occurred while sleeping until the next attempt of retrieving the job status for the job " + js.getId(), e);
            }
            js =  zd.getJobStatus(js);
            jsStatus =js.getStatus();
        }
        return js;
    }).thenAccept(Testing::updateDB);
}

public static void updateDB(JobStatus<User> resultObject){
    //perform various operations on the JobStatus object
}

The sleeping operation is definitely not ideal, but via Zendesk API you can only check for the job status completion status.