DocumentDeleteQueue

java.lang.Object
- org.apache.manifoldcf.crawler.system.DocumentDeleteQueue

```
public class DocumentDeleteQueue
extends java.lang.Object
```
This class describes a document queue, which has a "stuffer" thread and many "reader" threads. The queue manages thread synchronization so that (a) the "stuffer" thread blocks until queue is empty, and (b) the "reader" threads block if queue is empty. The objects being queued are all QueuedDocumentSet objects.

Field Summary

Fields
Modifier and Type Field Description

static java.lang.String _rcsid

protected java.util.ArrayList queue

Constructor Summary

Constructors
Constructor Description

DocumentDeleteQueue()
Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addDocuments(DocumentDeleteSet dd)`	Add a document set to the queue.
`boolean`	`checkIfEmpty(int n)`	Check if "empty".
`void`	`clear()`	Clear.
`DocumentDeleteSet`	`getDocuments()`	Pull a document set off the queue, and wait if there is nothing there.
`void`	`reset()`	Wake up all threads waiting on this queue.

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

- Field Detail
  - _rcsid
```
public static final java.lang.String _rcsid
```
    See Also:
    
    Constant Field Values
  - queue
```
protected java.util.ArrayList queue
```
- Constructor Detail
  - DocumentDeleteQueue
```
public DocumentDeleteQueue()
```
    Constructor.
- Method Detail
  - reset
```
public void reset()
```
    Wake up all threads waiting on this queue. This happens at the beginning of a reset.
  - clear
```
public void clear()
```
    Clear. This is only used on reset.
  - checkIfEmpty
```
public boolean checkIfEmpty(int n)
```
    Check if "empty".
    
    Parameters:
    
    n - is the low-water mark; if the number falls below this, then this method will return true.
  - addDocuments
```
public void addDocuments(DocumentDeleteSet dd)
```
    Add a document set to the queue. This will be a set of n documents (where n is some chunk size set by experiment).
    
    Parameters:
    
    dd - is the document set.
  - getDocuments
```
public DocumentDeleteSet getDocuments()
                               throws java.lang.InterruptedException
```
    Pull a document set off the queue, and wait if there is nothing there.
    
    Returns:
    
    the document.
    
    Throws:
    
    java.lang.InterruptedException