org.infinispan.lucene.readlocks

Class LocalLockMergingSegmentReadLocker

java.lang.Object

org.infinispan.lucene.readlocks.LocalLockMergingSegmentReadLocker

All Implemented Interfaces:

SegmentReadLocker

public class LocalLockMergingSegmentReadLocker
extends Object
implements SegmentReadLocker

LocalLockMergingSegmentReadLocker decorates the DistributedSegmentReadLocker to minimize remote operations in case several IndexReaders are opened on the same Infinispan based Directory. It keeps track of locks which where already acquired for a specific filename from another request on the same node and merges the request so that the different clients share the same remote lock.

Since:

4.1

Author:

Sanne Grinovero

Constructor Summary

Constructors

Constructor and Description
LocalLockMergingSegmentReadLocker(Cache<?,?> locksCache, Cache<?,?> chunksCache, Cache<?,?> metadataCache, String indexName) Create a new LocalLockMergingSegmentReadLocker with special purpose caches
LocalLockMergingSegmentReadLocker(Cache<?,?> cache, String indexName) Create a new LocalLockMergingSegmentReadLocker for specified cache and index name.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	acquireReadLock(String name) Acquires a readlock, in order to prevent other invocations to SegmentReadLocker.deleteOrReleaseReadLock(String) from deleting the file.
void	deleteOrReleaseReadLock(String name) It will release a previously acquired readLock, or if no readLock was acquired it will mark the file to be deleted as soon as all pending locks are releases.

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalLockMergingSegmentReadLocker

public LocalLockMergingSegmentReadLocker(Cache<?,?> cache,
                                 String indexName)

Create a new LocalLockMergingSegmentReadLocker for specified cache and index name.

Parameters:

cache -

indexName -

LocalLockMergingSegmentReadLocker

public LocalLockMergingSegmentReadLocker(Cache<?,?> locksCache,
                                 Cache<?,?> chunksCache,
                                 Cache<?,?> metadataCache,
                                 String indexName)

Create a new LocalLockMergingSegmentReadLocker with special purpose caches

Parameters:

locksCache - the cache to be used to store distributed locks

chunksCache - the cache containing the chunks, this is where the bulk of data is stored

metadataCache - smaller cache for the metadata of stored elements

indexName -

Method Detail

acquireReadLock

public boolean acquireReadLock(String name)

Acquires a readlock, in order to prevent other invocations to SegmentReadLocker.deleteOrReleaseReadLock(String) from deleting the file.

Specified by:

acquireReadLock in interface SegmentReadLocker

Returns:

true if the lock was acquired, false if the implementation detects the file does not exist, or that it's being deleted by some other thread.

See Also:

Directory#openInput(String)

deleteOrReleaseReadLock

public void deleteOrReleaseReadLock(String name)

It will release a previously acquired readLock, or if no readLock was acquired it will mark the file to be deleted as soon as all pending locks are releases. If it's invoked on a file without pending locks the file is deleted.

Specified by:

deleteOrReleaseReadLock in interface SegmentReadLocker

Parameters:

name - of the file to release or delete

See Also:

Directory#deleteFile(String)