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com.tangosol.util
Class ConverterCollections.ConverterNamedCache

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.ConverterCollections.ConverterMap
com.tangosol.util.ConverterCollections.ConverterObservableMap
com.tangosol.util.ConverterCollections.ConverterCacheMap
com.tangosol.util.ConverterCollections.ConverterNamedCache

All Implemented Interfaces:

CacheMap, NamedCache, ConcurrentMap, InvocableMap, ObservableMap, QueryMap, Serializable, Map

Enclosing class:

ConverterCollections

public static class ConverterCollections.ConverterNamedCache

extends ConverterCollections.ConverterCacheMap

implements NamedCache, Serializable

A Converter NamedCache views an underlying NamedCache through a set of key and value Converters.

Nested Class Summary

Nested classes/interfaces inherited from interface com.tangosol.util.QueryMap

QueryMap.Entry

Nested classes/interfaces inherited from interface com.tangosol.util.InvocableMap

InvocableMap.Entry, InvocableMap.EntryAggregator, InvocableMap.EntryProcessor, InvocableMap.ParallelAwareAggregator

Field Summary

protected ConverterCollections.ConverterConcurrentMap	m_mapConcurrent A Converter ConcurrentMap around the underlying NamedCache.
protected ConverterCollections.ConverterInvocableMap	m_mapInvocable A Converter InvocableMap around the underlying NamedCache.
protected ConverterCollections.ConverterQueryMap	m_mapQuery A Converter QueryMap around the underlying NamedCache.

Fields inherited from class com.tangosol.util.ConverterCollections.ConverterMap

m_convKeyDown, m_convKeyUp, m_convValDown, m_convValUp, m_map, m_set

Fields inherited from interface com.tangosol.net.cache.CacheMap

EXPIRY_DEFAULT, EXPIRY_NEVER

Fields inherited from interface com.tangosol.util.ConcurrentMap

LOCK_ALL

Constructor Summary

ConverterCollections.ConverterNamedCache(NamedCache cache, Converter convKeyUp, Converter convKeyDown, Converter convValUp, Converter convValDown)
Constructor.

Method Summary

void	addIndex(ValueExtractor extractor, boolean fOrdered, Comparator comparator) Add an index to this QueryMap.
Object	aggregate(Collection collKeys, InvocableMap.EntryAggregator agent) Perform an aggregating operation against the entries specified by the passed keys.
Object	aggregate(Filter filter, InvocableMap.EntryAggregator agent) Perform an aggregating operation against the set of entries that are selected by the given Filter.
void	destroy() Release and destroy this instance of NamedCache.
Set	entrySet(Filter filter) Return a set view of the entries contained in this map that satisfy the criteria expressed by the filter.
Set	entrySet(Filter filter, Comparator comparator) Return a set view of the entries contained in this map that satisfy the criteria expressed by the filter.
String	getCacheName() Return the cache name.
CacheService	getCacheService() Return the CacheService that this NamedCache is a part of.
NamedCache	getNamedCache() Return the underlying NamedCache.
Object	invoke(Object oKey, InvocableMap.EntryProcessor agent) Invoke the passed EntryProcessor against the Entry specified by the passed key, returning the result of the invocation.
Map	invokeAll(Collection collKeys, InvocableMap.EntryProcessor agent) Invoke the passed EntryProcessor against the entries specified by the passed keys, returning the result of the invocation for each.
Map	invokeAll(Filter filter, InvocableMap.EntryProcessor agent) Invoke the passed EntryProcessor against the set of entries that are selected by the given Filter, returning the result of the invocation for each.
boolean	isActive() Specifies whether or not the NamedCache is active.
Set	keySet(Filter filter) Return a set view of the keys contained in this map for entries that satisfy the criteria expressed by the filter.
boolean	lock(Object oKey) Attempt to lock the specified item and return immediately.
boolean	lock(Object oKey, long cWait) Attempt to lock the specified item within the specified period of time.
void	release() Release local resources associated with this instance of NamedCache.
void	removeIndex(ValueExtractor extractor) Remove an index from this QueryMap.
boolean	unlock(Object oKey) Unlock the specified item.

Methods inherited from class com.tangosol.util.ConverterCollections.ConverterCacheMap

getAll, getCacheMap, put

Methods inherited from class com.tangosol.util.ConverterCollections.ConverterObservableMap

addMapListener, addMapListener, addMapListener, getConverterListener, getObservableMap, removeMapListener, removeMapListener, removeMapListener

Methods inherited from class com.tangosol.util.ConverterCollections.ConverterMap

clear, containsKey, containsValue, entrySet, get, getConverterKeyDown, getConverterKeyUp, getConverterValueDown, getConverterValueUp, getMap, instantiateCollection, instantiateEntrySet, instantiateMap, instantiateSet, isEmpty, keySet, put, putAll, remove, size, toString, values

Methods inherited from interface com.tangosol.net.NamedCache

put

Methods inherited from interface com.tangosol.net.cache.CacheMap

getAll, put

Methods inherited from interface com.tangosol.util.ConcurrentMap

clear, containsKey, containsValue, get, isEmpty, put, putAll, remove, size

Field Detail

m_mapConcurrent

protected ConverterCollections.ConverterConcurrentMap m_mapConcurrent

A Converter ConcurrentMap around the underlying NamedCache.

m_mapInvocable

protected ConverterCollections.ConverterInvocableMap m_mapInvocable

A Converter InvocableMap around the underlying NamedCache.

m_mapQuery

protected ConverterCollections.ConverterQueryMap m_mapQuery

A Converter QueryMap around the underlying NamedCache.

Constructor Detail

ConverterCollections.ConverterNamedCache

public ConverterCollections.ConverterNamedCache(NamedCache cache,
                                                Converter convKeyUp,
                                                Converter convKeyDown,
                                                Converter convValUp,
                                                Converter convValDown)

Constructor.

Parameters:

cache - the underlying NamedCache

convKeyUp - the Converter to view the underlying NamedCache's keys through

convKeyDown - the Converter to use to pass keys down to the underlying NamedCache

convValUp - the Converter to view the underlying NamedCache's values through

convValDown - the Converter to use to pass values down to the underlying NamedCache

Method Detail

getCacheName

public String getCacheName()

Return the cache name.

Specified by:

getCacheName in interface NamedCache

Returns:

the cache name

getCacheService

public CacheService getCacheService()

Return the CacheService that this NamedCache is a part of.

Specified by:

getCacheService in interface NamedCache

Returns:

the CacheService

isActive

public boolean isActive()

Specifies whether or not the NamedCache is active.

Specified by:

isActive in interface NamedCache

Returns:

true if the NamedCache is active; false otherwise

release

public void release()

Release local resources associated with this instance of NamedCache.

Releasing a cache makes it no longer usable, but does not affect the cache itself. In other words, all other references to the cache will still be valid, and the cache data is not affected by releasing the reference. Any attempt to use this reference afterward will result in an exception.

Caches should be released by the same mechanism in which they were obtained. For example:

• new Cache() - cache.release()
• CacheFactory.getCache() - CacheFactory.releaseCache()
• ConfigurableCacheFactory.ensureCache() - ConfigurableCacheFactory.releaseCache()

Except for the case where the application code explicitly allocated the cache, this method should not be called by application code.

The purpose for releasing a cache is to allow the cache implementation to release the ClassLoader used to deserialize items in the cache. The cache implementation ensures that all references to that ClassLoader are released. This implies that objects in the cache that were loaded by that ClassLoader will be re-serialized to release their hold on that ClassLoader. The result is that the ClassLoader can be garbage-collected by Java in situations where the cache is operating in an application server and applications are dynamically loaded and unloaded.

Specified by:

release in interface NamedCache

See Also:

CacheFactory.releaseCache(NamedCache), ConfigurableCacheFactory.releaseCache(NamedCache)

destroy

public void destroy()

Release and destroy this instance of NamedCache.

Warning: This method is used to completely destroy the specified cache across the cluster. All references in the entire cluster to this cache will be invalidated, the cached data will be cleared, and all internal resources will be released.

Caches should be destroyed by the same mechansim in which they were obtained. For example:

• new Cache() - cache.destroy()
• CacheFactory.getCache() - CacheFactory.destroyCache()
• ConfigurableCacheFactory.ensureCache() - ConfigurableCacheFactory.destroyCache()

Except for the case where the application code expicitly allocated the cache, this method should not be called by application code.

Specified by:

destroy in interface NamedCache

See Also:

CacheFactory.destroyCache(NamedCache), ConfigurableCacheFactory.destroyCache(NamedCache)

lock

public boolean lock(Object oKey,
                    long cWait)

Attempt to lock the specified item within the specified period of time.

The item doesn't have to exist to be locked. While the item is locked there is known to be a lock holder which has an exclusive right to modify (calling put and remove methods) that item.

Lock holder is an abstract concept that depends on the ConcurrentMap implementation. For example, holder could be a cluster member or a thread (or both).

Locking strategy may vary for concrete implementations as well. Lock could have an expiration time (this lock is sometimes called a "lease") or be held indefinitely (until the lock holder terminates).

Some implementations may allow the entire map to be locked. If the map is locked in such a way, then only a lock holder is allowed to perform any of the "put" or "remove" operations. Pass the special constant ConcurrentMap.LOCK_ALL as the oKey parameter to indicate the map lock.

Specified by:

lock in interface ConcurrentMap

Parameters:

oKey - key being locked

cWait - the number of milliseconds to continue trying to obtain a lock; pass zero to return immediately; pass -1 to block the calling thread until the lock could be obtained

Returns:

true if the item was successfully locked within the specified time; false otherwise

lock

public boolean lock(Object oKey)

Attempt to lock the specified item and return immediately.

This method behaves exactly as if it simply performs the call lock(oKey, 0).

Specified by:

lock in interface ConcurrentMap

Parameters:

oKey - key being locked

Returns:

true if the item was successfully locked; false otherwise

unlock

public boolean unlock(Object oKey)

Unlock the specified item. The item doesn't have to exist to be unlocked. If the item is currently locked, only the holder of the lock could successfully unlock it.

Specified by:

unlock in interface ConcurrentMap

Parameters:

oKey - key being unlocked

Returns:

true if the item was successfully unlocked; false otherwise

invoke

public Object invoke(Object oKey,
                     InvocableMap.EntryProcessor agent)

Invoke the passed EntryProcessor against the Entry specified by the passed key, returning the result of the invocation.

Specified by:

invoke in interface InvocableMap

Parameters:

oKey - the key to process; it is not required to exist within the Map

agent - the EntryProcessor to use to process the specified key

Returns:

the result of the invocation as returned from the EntryProcessor

invokeAll

public Map invokeAll(Collection collKeys,
                     InvocableMap.EntryProcessor agent)

Invoke the passed EntryProcessor against the entries specified by the passed keys, returning the result of the invocation for each.

Specified by:

invokeAll in interface InvocableMap

Parameters:

collKeys - the keys to process; these keys are not required to exist within the Map

agent - the EntryProcessor to use to process the specified keys

Returns:

a Map containing the results of invoking the EntryProcessor against each of the specified keys

invokeAll

public Map invokeAll(Filter filter,
                     InvocableMap.EntryProcessor agent)

Invoke the passed EntryProcessor against the set of entries that are selected by the given Filter, returning the result of the invocation for each. <p/> Unless specified otherwise, InvocableMap implementations will perform this operation in two steps: (1) use the filter to retrieve a matching entry set; (2) apply the agent to every filtered entry. This algorithm assumes that the agent's processing does not affect the result of the specified filter evaluation, since the filtering and processing could be performed in parallel on different threads. If this assumption does not hold, the processor logic has to be idempotent, or at least re-evaluate the filter. This could be easily accomplished by wrapping the processor with the ConditionalProcessor.

Specified by:

invokeAll in interface InvocableMap

Parameters:

filter - a Filter that results in the set of keys to be processed

agent - the EntryProcessor to use to process the specified keys

Returns:

a Map containing the results of invoking the EntryProcessor against the keys that are selected by the given Filter

aggregate

public Object aggregate(Collection collKeys,
                        InvocableMap.EntryAggregator agent)

Perform an aggregating operation against the entries specified by the passed keys.

Specified by:

aggregate in interface InvocableMap

Parameters:

collKeys - the Collection of keys that specify the entries within this Map to aggregate across

agent - the EntryAggregator that is used to aggregate across the specified entries of this Map

Returns:

the result of the aggregation

aggregate

public Object aggregate(Filter filter,
                        InvocableMap.EntryAggregator agent)

Perform an aggregating operation against the set of entries that are selected by the given Filter.

Specified by:

aggregate in interface InvocableMap

Parameters:

filter - the Filter that is used to select entries within this Map to aggregate across

agent - the EntryAggregator that is used to aggregate across the selected entries of this Map

Returns:

the result of the aggregation

keySet

public Set keySet(Filter filter)

Return a set view of the keys contained in this map for entries that satisfy the criteria expressed by the filter. <p/> Unlike the Map.keySet() method, the set returned by this method may not be backed by the map, so changes to the set may not reflected in the map, and vice-versa. <p/> Note: When using the Coherence Enterprise Edition or Grid Edition, the Partitioned Cache implements the QueryMap interface using the Parallel Query feature. When using Coherence Standard Edition, the Parallel Query feature is not available, resulting in lower performance for most queries, and particularly when querying large data sets.

Specified by:

keySet in interface QueryMap

Parameters:

filter - the Filter object representing the criteria that the entries of this map should satisfy

Returns:

a set of keys for entries that satisfy the specified criteria

entrySet

public Set entrySet(Filter filter)

Return a set view of the entries contained in this map that satisfy the criteria expressed by the filter. Each element in the returned set is a Map.Entry. <p/> Unlike the Map.entrySet() method, the set returned by this method may not be backed by the map, so changes to the set may not be reflected in the map, and vice-versa. <p/> Note: When using the Coherence Enterprise Edition or Grid Edition, the Partitioned Cache implements the QueryMap interface using the Parallel Query feature. When using Coherence Standard Edition, the Parallel Query feature is not available, resulting in lower performance for most queries, and particularly when querying large data sets.

Specified by:

entrySet in interface QueryMap

Parameters:

filter - the Filter object representing the criteria that the entries of this map should satisfy

Returns:

a set of entries that satisfy the specified criteria

entrySet

public Set entrySet(Filter filter,
                    Comparator comparator)

Return a set view of the entries contained in this map that satisfy the criteria expressed by the filter. Each element in the returned set is a Map.Entry. It is further guaranteed that its iterator will traverse the set in such a way that the entry values come up in ascending order, sorted by the specified Comparator or according to the natural ordering (see Comparable). <p/> Unlike the Map.entrySet() method, the set returned by this method may not be backed by the map, so changes to the set may not be reflected in the map, and vice-versa. <p/> Note: When using the Coherence Enterprise Edition or Grid Edition, the Partitioned Cache implements the QueryMap interface using the Parallel Query feature. When using Coherence Standard Edition, the Parallel Query feature is not available, resulting in lower performance for most queries, and particularly when querying large data sets.

Specified by:

entrySet in interface QueryMap

Parameters:

filter - the Filter object representing the criteria that the entries of this map should satisfy

comparator - the Comparator object which imposes an ordering on entries in the resulting set; or null if the entries' values natural ordering should be used

Returns:

a set of entries that satisfy the specified criteria

See Also:

ChainedComparator

addIndex

public void addIndex(ValueExtractor extractor,
                     boolean fOrdered,
                     Comparator comparator)

Add an index to this QueryMap. This allows to correlate values stored in this indexed Map (or attributes of those values) to the corresponding keys in the indexed Map and increase the performance of keySet and entrySet methods. <p/> This method is only intended as a hint to the cache implementation, and as such it may be ignored by the cache if indexes are not supported or if the desired index (or a similar index) already exists. It is expected that an application will call this method to suggest an index even if the index may already exist, just so that the application is certain that index has been suggested. For example in a distributed environment, each server will likely suggest the same set of indexes when it starts, and there is no downside to the application blindly requesting those indexes regardless of whether another server has already requested the same indexes. <p/> Note: Indexes are a feature of Coherence Enterprise Edition and Coherence Grid Edition. This method will have no effect when using Coherence Standard Edition.

Specified by:

addIndex in interface QueryMap

Parameters:

extractor - the ValueExtractor object that is used to extract an indexable Object from a value stored in the indexed Map. Must not be null.

fOrdered - true iff the contents of the indexed information should be ordered; false otherwise

comparator - the Comparator object which imposes an ordering on entries in the indexed map; or null if the entries' values natural ordering should be used

See Also:

ReflectionExtractor, ChainedComparator

removeIndex

public void removeIndex(ValueExtractor extractor)

Remove an index from this QueryMap.

Specified by:

removeIndex in interface QueryMap

Parameters:

extractor - the ValueExtractor object that is used to extract an indexable Object from a value stored in the Map.

getNamedCache

public NamedCache getNamedCache()

Return the underlying NamedCache.

Returns:

the underlying NamedCache

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