org.jboss.cache.eviction
Class BaseSortedEvictionAlgorithm
java.lang.Object
org.jboss.cache.eviction.BaseEvictionAlgorithm
org.jboss.cache.eviction.BaseSortedEvictionAlgorithm
- All Implemented Interfaces:
- EvictionAlgorithm
- Direct Known Subclasses:
- ElementSizeAlgorithm, LFUAlgorithm
public abstract class BaseSortedEvictionAlgorithm
- extends BaseEvictionAlgorithm
- implements EvictionAlgorithm
An abstract SortedEvictionAlgorithm.
This class supports early termination of the eviction queue processing. Because the eviction
queue is sorted by first to evict to last to evict, when iterating the eviction queue, the first time
a node is encountered that does not require eviction will terminate the loop early. This way we don't incur
the full breadth of the O(n) = n operation everytime we need to check for eviction (defined by eviction poll time
interval).
- Author:
- Daniel Huang - dhuang@jboss.org - 10/2005
Method Summary |
void |
process(Region region)
Process the given region. |
protected void |
processQueues(Region region)
Event processing for Evict/Add/Visiting of nodes. |
protected void |
resortEvictionQueue(boolean evictionQueueModified)
This method is called to resort the queue after add or visit events have occurred. |
Methods inherited from class org.jboss.cache.eviction.BaseEvictionAlgorithm |
emptyRecycleQueue, evict, evictCacheNode, getEvictionQueue, initialize, isNodeInUseAndNotTimedOut, isYoungerThanMinimumTimeToLive, processAddedElement, processAddedNodes, processAddedNodes, processMarkInUseNodes, processRemovedElement, processRemovedNodes, processUnmarkInUseNodes, processVisitedNodes, prune, resetEvictionQueue, setupEvictionQueue, shouldEvictNode, toString |
BaseSortedEvictionAlgorithm
public BaseSortedEvictionAlgorithm()
process
public void process(Region region)
throws EvictionException
- Description copied from class:
BaseEvictionAlgorithm
- Process the given region.
Eviction Processing encompasses the following:
- Add/Remove/Visit Nodes
- Prune according to Eviction Algorithm
- Empty/Retry the recycle queue of previously evicted but locked (during actual cache eviction) nodes.
- Specified by:
process
in interface EvictionAlgorithm
- Overrides:
process
in class BaseEvictionAlgorithm
- Parameters:
region
- Cache region to process for eviction.
- Throws:
EvictionException
processQueues
protected void processQueues(Region region)
throws EvictionException
- Description copied from class:
BaseEvictionAlgorithm
- Event processing for Evict/Add/Visiting of nodes.
- On AddEvents a new element is added into the eviction queue
- On RemoveEvents, the removed element is removed from the eviction queue.
- On VisitEvents, the visited node has its eviction statistics updated (idleTime, numberOfNodeVisists, etc..)
- Overrides:
processQueues
in class BaseEvictionAlgorithm
- Parameters:
region
- Cache region to process for eviction.
- Throws:
EvictionException
resortEvictionQueue
protected void resortEvictionQueue(boolean evictionQueueModified)
- This method is called to resort the queue after add or visit events have occurred.
If the parameter is true, the queue needs to be resorted. If it is false, the queue does not
need resorting.
- Parameters:
evictionQueueModified
- True if the queue was added to or visisted during event processing.
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