Oracle® Coherence Java API Reference
v3.5

E14977-01

com.tangosol.util
Class SegmentedConcurrentMap.SizeAction

java.lang.Object
  extended by com.tangosol.util.SegmentedHashMap.EntryActionAdapter
      extended by com.tangosol.util.SegmentedConcurrentMap.SizeAction
All Implemented Interfaces:
SegmentedHashMap.EntryAction, SegmentedHashMap.IterableEntryAction
Enclosing class:
SegmentedConcurrentMap

protected static class SegmentedConcurrentMap.SizeAction
extends SegmentedHashMap.EntryActionAdapter

Action support for size(). The action is invoked on each Entry in the map to determine the number of key-value mappings contained in the map. SizeAction is not required to run while holding any segment-locks.

The context object for a SizeAction is an opaque context created by instantiateContext.

The result of invoking a SizeAction is the number of key-value mappings found in the map.


Constructor Summary
protected SegmentedConcurrentMap.SizeAction()
           
 
Method Summary
 java.lang.Object instantiateContext(boolean fEmptyCheck)
          Instantiate a context appropriate for applying SizeAction to count the number of entries in the map.
 java.lang.Object invokeFound(java.lang.Object oKey, java.lang.Object oContext, SegmentedHashMap.Entry[] aeBucket, int nBucket, SegmentedHashMap.Entry entryPrev, SegmentedHashMap.Entry entryCur)
          Invoke some action, holding the segment lock, when a matching Entry is found.
 boolean isComplete(java.lang.Object oContext)
          Return true iff further key evaluations for the given context are known to be unnecessary.
 int size(java.lang.Object oContext)
          Return the number of Entry objects found while applying this action.
 
Methods inherited from class com.tangosol.util.SegmentedHashMap.EntryActionAdapter
invokeNotFound
 

Constructor Detail

SegmentedConcurrentMap.SizeAction

protected SegmentedConcurrentMap.SizeAction()
Method Detail

invokeFound

public java.lang.Object invokeFound(java.lang.Object oKey,
                                    java.lang.Object oContext,
                                    SegmentedHashMap.Entry[] aeBucket,
                                    int nBucket,
                                    SegmentedHashMap.Entry entryPrev,
                                    SegmentedHashMap.Entry entryCur)
Invoke some action, holding the segment lock, when a matching Entry is found.

Specified by:
invokeFound in interface SegmentedHashMap.EntryAction
Overrides:
invokeFound in class SegmentedHashMap.EntryActionAdapter
Parameters:
oKey - the key to which the action is applied
oContext - opaque context specific to the action
aeBucket - the bucket array
nBucket - the index into the bucket array
entryPrev - the Entry object immediately preceding the Entry that was found, or null
entryCur - the Entry object that was found
Returns:
an opaque result value

isComplete

public boolean isComplete(java.lang.Object oContext)
Return true iff further key evaluations for the given context are known to be unnecessary.

Specified by:
isComplete in interface SegmentedHashMap.IterableEntryAction
Overrides:
isComplete in class SegmentedHashMap.EntryActionAdapter
Parameters:
oContext - the action context
Returns:
true iff further evaluations are unnecessary

size

public int size(java.lang.Object oContext)
Return the number of Entry objects found while applying this action.

Parameters:
oContext - the action context
Returns:
the number of Entry objects found

instantiateContext

public java.lang.Object instantiateContext(boolean fEmptyCheck)
Instantiate a context appropriate for applying SizeAction to count the number of entries in the map.


Oracle® Coherence Java API Reference
v3.5

E14977-01

Copyright © 2000, 2009, Oracle. All rights reserved.