org.infinispan.lucene.readlocks
Class LocalLockMergingSegmentReadLocker

java.lang.Object
  extended by 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 InfinispanDirectory. 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
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
 boolean acquireReadLock(String name)
          Acquires a readlock, in order to prevent other invocations to SegmentReadLocker.deleteOrReleaseReadLock(String) from deleting the file.
 boolean aquireReadLock(String filename)
          Deprecated. 
 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

aquireReadLock

@Deprecated
public boolean aquireReadLock(String filename)
Deprecated. 

Specified by:
aquireReadLock in interface SegmentReadLocker

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:
InfinispanDirectory.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:
InfinispanDirectory.deleteFile(String)

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