com.bigdata.cache
Class ConcurrentWeakValueCacheWithTimeout<K,V>

java.lang.Object
  com.bigdata.cache.ConcurrentWeakValueCache<K,V>
      com.bigdata.cache.ConcurrentWeakValueCacheWithTimeout<K,V>

All Implemented Interfaces:

IConcurrentWeakValueCache<K,V>

Direct Known Subclasses:

IndexManager.IndexCache

public class ConcurrentWeakValueCacheWithTimeout<K,V>
extends ConcurrentWeakValueCache<K,V>

Extends the basic behavior to clear stale references from a backing hard reference queue. The weak reference values for entries whose hard reference is cleared from the backing hard reference queue WILL NOT be cleared from this map as long as those references remain strongly reachable.

Version:

$Id: ConcurrentWeakValueCacheWithTimeout.java 2265 2009-10-26 12:51:06Z thompsonbry $

Author:

Bryan Thompson

See Also:

SynchronizedHardReferenceQueueWithTimeout

Nested Class Summary

Nested classes/interfaces inherited from class com.bigdata.cache.ConcurrentWeakValueCache

ConcurrentWeakValueCache.WeakRef<K,V>

Field Summary

Fields inherited from class com.bigdata.cache.ConcurrentWeakValueCache

DEBUG, INFO, log

Constructor Summary

ConcurrentWeakValueCacheWithTimeout(int queueCapacity, float loadFactor, int concurrencyLevel, long timeout)
Ctor variant using a SynchronizedHardReferenceQueueWithTimeout with the specified capacity, timeout for stale references, and the specified concurrency level for the inner ConcurrentHashMap used by this class.

ConcurrentWeakValueCacheWithTimeout(int queueCapacity, long timeout)
Ctor variant using a SynchronizedHardReferenceQueueWithTimeout with the specified capacity and timeout for stale references.

Method Summary

Methods inherited from class com.bigdata.cache.ConcurrentWeakValueCache

capacity, clear, containsKey, didUpdate, entryIterator, get, isRemoveClearedReferences, iterator, newWeakRef, put, putIfAbsent, remove, removeClearedEntries, removeMapEntry, size

Methods inherited from class java.lang.Object

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

Constructor Detail

ConcurrentWeakValueCacheWithTimeout

public ConcurrentWeakValueCacheWithTimeout(int queueCapacity,
                                           long timeout)

Ctor variant using a SynchronizedHardReferenceQueueWithTimeout with the specified capacity and timeout for stale references.

Parameters:

timeout - The timeout in nanoseconds.

ConcurrentWeakValueCacheWithTimeout

public ConcurrentWeakValueCacheWithTimeout(int queueCapacity,
                                           float loadFactor,
                                           int concurrencyLevel,
                                           long timeout)

Ctor variant using a SynchronizedHardReferenceQueueWithTimeout with the specified capacity, timeout for stale references, and the specified concurrency level for the inner ConcurrentHashMap used by this class.

Parameters:

timeout - The timeout in nanoseconds.