org.apache.manifoldcf.crawler.system

Class 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 and Description
static java.lang.String	_rcsid
protected java.util.ArrayList	queue

Constructor Summary

Constructors

Constructor and Description
DocumentDeleteQueue() Constructor.

Method Summary

Modifier and Type	Method and 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