QueueStatusListener

```
public interface QueueStatusListener

                    
```
Listener allows to check state of tasks in Queue.
All methods will be called in the background thread. This interface is internal and intended for debug purposes. Avoid blocking operations in the current thread

Method Summary

Modifier and Type	Method	Description
`abstract void`	`onTaskAdded(@NonNull() Task<out Object> task)`	Called when new task is added to the queue or failed task is added back to the queue for retry
`abstract void`	`onTaskStarted(@NonNull() Task<out Object> task)`	Called when task started execution on the queue executor
`abstract void`	`onTaskFinished(@NonNull() Task<out Object> task, @NonNull() QueueResult result)`	Called when task completed execution - successfully or not (moving back to pending state)
`abstract void`	`onTaskDropped(@NonNull() Task<out Object> task)`	Called when task is removed from queue because of reaching pendingTasksLimit in the queue

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - onTaskAdded
```
@WorkerThread() abstract void onTaskAdded(@NonNull() Task<out Object> task)
```
    Called when new task is added to the queue or failed task is added back to the queue for retry
  - onTaskStarted
```
@WorkerThread() abstract void onTaskStarted(@NonNull() Task<out Object> task)
```
    Called when task started execution on the queue executor
  - onTaskFinished
```
@WorkerThread() abstract void onTaskFinished(@NonNull() Task<out Object> task, @NonNull() QueueResult result)
```
    Called when task completed execution - successfully or not (moving back to pending state)
  - onTaskDropped
```
@WorkerThread() abstract void onTaskDropped(@NonNull() Task<out Object> task)
```
    Called when task is removed from queue because of reaching pendingTasksLimit in the queue