org.apache.lucene.index

Class ConcurrentMergeScheduler

java.lang.Object

org.apache.lucene.index.MergeScheduler

org.apache.lucene.index.ConcurrentMergeScheduler

public class ConcurrentMergeScheduler
extends MergeScheduler

A MergeScheduler that runs each merge using a separate thread, up until a maximum number of threads (setMaxThreadCount(int)) at which points merges are run in the foreground, serially. This is a simple way to use concurrency in the indexing process without having to create and manage application level threads.

Constructor Summary

Constructors

Constructor and Description
ConcurrentMergeScheduler()

Method Summary

Modifier and Type	Method and Description
static boolean	anyUnhandledExceptions() Used for testing
void	close() Close this MergeScheduler.
int	getMaxThreadCount() Get the max # simultaneous threads that may be running.
int	getMergeThreadPriority() Return the priority that merge threads run at.
void	merge(IndexWriter writer) Run the merges provided by IndexWriter.getNextMerge().
void	setMaxThreadCount(int count) Sets the max # simultaneous threads that may be running.
void	setMergeThreadPriority(int pri) Return the priority that merge threads run at.
static void	setTestMode()
void	sync()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConcurrentMergeScheduler

public ConcurrentMergeScheduler()

Method Detail

setMaxThreadCount

public void setMaxThreadCount(int count)

Sets the max # simultaneous threads that may be running. If a merge is necessary yet we already have this many threads running, the merge is returned back to IndexWriter so that it runs in the "foreground".

getMaxThreadCount

public int getMaxThreadCount()

Get the max # simultaneous threads that may be running. @see #setMaxThreadCount.

getMergeThreadPriority

public int getMergeThreadPriority()

Return the priority that merge threads run at. By default the priority is 1 plus the priority of (ie, slightly higher priority than) the first thread that calls merge.

setMergeThreadPriority

public void setMergeThreadPriority(int pri)

Return the priority that merge threads run at.

close

public void close()

Description copied from class: MergeScheduler

Close this MergeScheduler.

sync

public void sync()

merge

public void merge(IndexWriter writer)
           throws CorruptIndexException,
                  java.io.IOException

Description copied from class: MergeScheduler

Run the merges provided by IndexWriter.getNextMerge().

Throws:

CorruptIndexException

java.io.IOException

anyUnhandledExceptions

public static boolean anyUnhandledExceptions()

Used for testing

setTestMode

public static void setTestMode()