OperationQueue (ZK Professional Utilities 10.3.0.FL.20251230 API)

java.lang.Object
- org.zkoss.zkex.zul.impl.OperationQueue

```
public class OperationQueue
extends java.lang.Object
```
A queue for storing Operation and is thread-safe. This class is for model sharer developer only, you rarely need to use this class.

Available in ZK PE and ZK EE.

Since:

3.0.0

Author:

Dennis.Chen

Constructor Summary

Constructors
Constructor Description

OperationQueue()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addListener(OperationQueueListener listener)`	Add a listener to this queue
`Operation`	`element()`	Get an operation from queue, doesn't remove it.
`boolean`	`hasElement()`	Check is there any operation in queue.
`Operation`	`next()`	Get an operation from queue, and then remove it.
`void`	`put(Operation op)`	Put an operation to queue
`void`	`remove()`	Remove the first operation in queue if exist.
`void`	`removeListener(OperationQueueListener listener)`	Remove a listener to this queue.

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

- Constructor Detail
  - OperationQueue
```
public OperationQueue()
```
- Method Detail
  - addListener
```
public void addListener(OperationQueueListener listener)
```
    Add a listener to this queue
  - removeListener
```
public void removeListener(OperationQueueListener listener)
```
    Remove a listener to this queue.
  - put
```
public void put(Operation op)
```
    Put an operation to queue
    
    Parameters:
    
    op - the operation.
  - element
```
public Operation element()
```
    Get an operation from queue, doesn't remove it.
    
    Returns:
    
    the first operation in queue, null if not such operation.
  - hasElement
```
public boolean hasElement()
```
    Check is there any operation in queue.
    
    Returns:
    
    true if there exist any operation in queue.
  - next
```
public Operation next()
```
    Get an operation from queue, and then remove it.
    
    Returns:
    
    the first operation in queue, null if not such operation.
  - remove
```
public void remove()
```
    Remove the first operation in queue if exist.