Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.services.cache.ConcurrentCache

Modifier and Type	Field and Description
private final ConcurrentHashMap<Object, CacheEntry>	cache Map with all the cached objects.
private BackgroundCleaner	cleaner Background cleaner which can be used to clean cached objects in a separate thread to avoid blocking the user threads.
private volatile boolean	collectAccessCounts Flag that tells if hit/miss/eviction counts should be collected.
private final AtomicLong	evictions The number of evictions from the cache.
private final AtomicLong	hits The number of cache hits.
private final CacheableFactory	holderFactory Factory which creates `Cacheable`s.
private final int	maxSize The maximum size (number of elements) for this cache.
private Object	mbean The identifier of the MBean that allows monitoring of this instance.
private final AtomicLong	misses The number of cache misses.
private final String	name Name of this cache.
private final ReplacementPolicy	replacementPolicy Replacement policy to be used for this cache.
private volatile boolean	stopped Flag that indicates whether this cache instance has been shut down.

Access	Constructor and Description
pack-priv	ConcurrentCache(CacheableFactory factory which creates `Cacheable`s holderFactory, String the name of the cache name, int the initial capacity of the cache initialSize, int maximum number of elements in the cache maxSize) Creates a new cache manager.

Method Summary

Modifier and Type	Method and Description
public void	ageOut() Implements org.apache.derby.iapi.services.cache.CacheManager.ageOut. Remove all objects that are not kept and not dirty.
public void	clean(Matchable the partial (or exact) key to match partialKey) Implements org.apache.derby.iapi.services.cache.CacheManager.clean. Clean all dirty objects matching a partial key.
public void	cleanAll() Implements org.apache.derby.iapi.services.cache.CacheManager.cleanAll. Clean all dirty objects in the cache.
pack-priv void	cleanAndUnkeepEntry(CacheEntry the entry to clean entry, Cacheable the cached object contained in the entry item) Clean an entry in the cache and decrement its keep count.
private void	cleanCache(Matchable the partial (or exact) key to match, or `null` to match all keys partialKey) Clean all dirty objects matching a partial key.
pack-priv void	cleanEntry(CacheEntry the entry to clean entry) Clean an entry in the cache.
private void	countEviction() Count an eviction from the cache.
private void	countHit() Count a cache hit.
private void	countMiss() Count a cache miss.
public Cacheable	Returns: a reference to the cached object, or `null` if the object cannot be created create(Object identity of the object to create key, Object parameters passed to `Cacheable.createIdentity()` createParameter) Implements org.apache.derby.iapi.services.cache.CacheManager.create. Create an object in the cache.
public void	deregisterMBean() Implements org.apache.derby.iapi.services.cache.CacheManager.deregisterMBean. Deregister the MBean that monitors this cache.
public boolean	Returns: `true` if all matching objects were removed, `false` otherwise discard(Matchable the partial (or exact) key, or `null` to match all keys partialKey) Implements org.apache.derby.iapi.services.cache.CacheManager.discard. Discard all unused objects that match a partial key.
pack-priv void	evictEntry(Object identity of the entry to remove key) Evict an entry to make room for a new entry that is being inserted into the cache.
public Cacheable	Returns: the cached object, or `null` if it cannot be found find(Object identity of the object to find key) Implements org.apache.derby.iapi.services.cache.CacheManager.find. Find an object in the cache.
public Cacheable	Returns: the cached object, or `null` if it's not in the cache findCached(Object identity of the object to find key) Implements org.apache.derby.iapi.services.cache.CacheManager.findCached. Find an object in the cache.
pack-priv long	getAllocatedEntries() Get the number of allocated entries in the cache.
pack-priv BackgroundCleaner	getBackgroundCleaner()
pack-priv boolean	getCollectAccessCounts() Check if collection of hit/miss/eviction counts is enabled.
private CacheEntry	Returns: an entry for the specified key, always locked getEntry(Object the identity of the cached object key) Get the entry associated with the specified key from the cache.
pack-priv long	getEvictionCount() Get the number of evictions from the cache.
pack-priv long	getHitCount() Get the number of cache hits.
pack-priv long	getMaxEntries() Get the maximum number of entries in the cache.
pack-priv long	getMissCount() Get the number of cache misses.
pack-priv ReplacementPolicy	Returns: replacement policy getReplacementPolicy() Return the `ReplacementPolicy` instance for this cache.
private static Object	getSystemModule(final String factoryInterface) Must be private so that user code can't call this entry point.
pack-priv long	getUsedEntries() Get the number of cached objects.
private Cacheable	Returns: a `Cacheable` object that the caller can reuse insertIntoFreeSlot(Object the identity of the object being inserted key, CacheEntry the entry that is being inserted entry) Insert a `CacheEntry` into a free slot in the `ReplacementPolicy`'s internal data structure, and return a `Cacheable` that the caller can reuse.
public void	registerMBean(String the unique name of the database to which the cache belongs dbName) Implements org.apache.derby.iapi.services.cache.CacheManager.registerMBean. Register an MBean that allows user to monitor this cache instance.
public void	release(Cacheable a `Cacheable` value item) Implements org.apache.derby.iapi.services.cache.CacheManager.release. Release an object that has been fetched from the cache with `find()`, `findCached()` or `create()`.
public void	remove(Cacheable the object to remove from the cache item) Implements org.apache.derby.iapi.services.cache.CacheManager.remove. Remove an object from the cache.
private void	removeEntry(Object the identity of the entry to remove key) Remove an entry from the cache.
pack-priv void	setCollectAccessCounts(boolean collect) Enable or disable collection of hit/miss/eviction counts.
private void	settingIdentityComplete(Object the identity of the object being inserted key, CacheEntry the entry which is going to hold the cached object entry, Cacheable a `Cacheable` object with the identity set (if the identity was successfully set), or `null` if setting the identity failed item) Complete the setting of the identity.
public void	shutdown() Implements org.apache.derby.iapi.services.cache.CacheManager.shutdown. Shut down the cache.
public void	useDaemonService(DaemonService the daemon service to use daemon) Implements org.apache.derby.iapi.services.cache.CacheManager.useDaemonService. Specify a daemon service that can be used to perform operations in the background.
public Collection<Cacheable>	Returns: a collection view of the objects in the cache values() Implements org.apache.derby.iapi.services.cache.CacheManager.values. Return a collection view of all the `Cacheable`s in the cache.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

cache	back to summary
private final ConcurrentHashMap<Object, CacheEntry> cache Map with all the cached objects.

cleaner	back to summary
private BackgroundCleaner cleaner Background cleaner which can be used to clean cached objects in a separate thread to avoid blocking the user threads.

collectAccessCounts	back to summary
private volatile boolean collectAccessCounts Flag that tells if hit/miss/eviction counts should be collected.

evictions	back to summary
private final AtomicLong evictions The number of evictions from the cache.

hits	back to summary
private final AtomicLong hits The number of cache hits.

holderFactory	back to summary
private final CacheableFactory holderFactory Factory which creates `Cacheable`s.

maxSize	back to summary
private final int maxSize The maximum size (number of elements) for this cache.

mbean	back to summary
private Object mbean The identifier of the MBean that allows monitoring of this instance.

misses	back to summary
private final AtomicLong misses The number of cache misses.

name	back to summary
private final String name Name of this cache.

replacementPolicy	back to summary
private final ReplacementPolicy replacementPolicy Replacement policy to be used for this cache.

stopped	back to summary
private volatile boolean stopped Flag that indicates whether this cache instance has been shut down. When it has been stopped, `find()`, `findCached()` and `create()` will return `null`. The flag is declared `volatile` so that no synchronization is needed when it is accessed by concurrent threads.

ConcurrentCache	back to summary
pack-priv ConcurrentCache(CacheableFactory holderFactory, String name, int initialSize, int maxSize) Creates a new cache manager. Parameters holderFactory:CacheableFactory factory which creates `Cacheable`s name:String the name of the cache initialSize:int the initial capacity of the cache maxSize:int maximum number of elements in the cache

Method Detail

ageOut	back to summary
public void ageOut() Implements org.apache.derby.iapi.services.cache.CacheManager.ageOut. Remove all objects that are not kept and not dirty.

ageOut

back to summary

public void ageOut()

Implements org.apache.derby.iapi.services.cache.CacheManager.ageOut.

Remove all objects that are not kept and not dirty.

clean	back to summary
public void clean(Matchable partialKey) throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.clean. Clean all dirty objects matching a partial key. Parameters partialKey:Matchable the partial (or exact) key to match Exceptions StandardException: Doc from org.apache.derby.iapi.services.cache.CacheManager.clean. Standard Derby error policy.

clean

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public void clean(Matchable partialKey) throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.clean.

Clean all dirty objects matching a partial key.

Parameters

partialKey:Matchable: the partial (or exact) key to match

Exceptions

StandardException:

Doc from org.apache.derby.iapi.services.cache.CacheManager.clean.

Standard Derby error policy.

cleanAll	back to summary
public void cleanAll() throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.cleanAll. Clean all dirty objects in the cache. All objects that existed in the cache at the time of the call will be cleaned. Objects added later may or may not be cleaned. Exceptions StandardException: Doc from org.apache.derby.iapi.services.cache.CacheManager.cleanAll. Standard Derby error policy.

cleanAll

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public void cleanAll() throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.cleanAll.

Clean all dirty objects in the cache. All objects that existed in the cache at the time of the call will be cleaned. Objects added later may or may not be cleaned.

Exceptions

StandardException:

Doc from org.apache.derby.iapi.services.cache.CacheManager.cleanAll.

Standard Derby error policy.

cleanAndUnkeepEntry back to summary

cleanAndUnkeepEntry	back to summary
pack-priv void cleanAndUnkeepEntry(CacheEntry entry, Cacheable item) throws StandardException Clean an entry in the cache and decrement its keep count. The entry must be kept before this method is called, and it must contain the specified `Cacheable`. Parameters entry:CacheEntry the entry to clean item:Cacheable the cached object contained in the entry Exceptions StandardException: if an error occurs while cleaning

pack-priv void cleanAndUnkeepEntry(CacheEntry entry, Cacheable item) throws StandardException

Clean an entry in the cache and decrement its keep count. The entry must be kept before this method is called, and it must contain the specified Cacheable.

Parameters

entry:CacheEntry: the entry to clean
item:Cacheable: the cached object contained in the entry

Exceptions

StandardException:: if an error occurs while cleaning

cleanCache back to summary

cleanCache	back to summary
private void cleanCache(Matchable partialKey) throws StandardException Clean all dirty objects matching a partial key. If no key is specified, clean all dirty objects in the cache. Parameters partialKey:Matchable the partial (or exact) key to match, or `null` to match all keys

private void cleanCache(Matchable partialKey) throws StandardException

Clean all dirty objects matching a partial key. If no key is specified, clean all dirty objects in the cache.

Parameters

partialKey:Matchable: the partial (or exact) key to match, or null to match all keys

cleanEntry	back to summary
pack-priv void cleanEntry(CacheEntry entry) throws StandardException Clean an entry in the cache. Parameters entry:CacheEntry the entry to clean Exceptions StandardException: if an error occurs while cleaning

cleanEntry

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pack-priv void cleanEntry(CacheEntry entry) throws StandardException

Clean an entry in the cache.

Parameters

entry:CacheEntry: the entry to clean

Exceptions

StandardException:: if an error occurs while cleaning

countEviction	back to summary
private void countEviction() Count an eviction from the cache.

countHit	back to summary
private void countHit() Count a cache hit.

countMiss	back to summary
private void countMiss() Count a cache miss.

create back to summary

create	back to summary
public Cacheable create(Object key, Object createParameter) throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.create. Create an object in the cache. The object is kept until `release()` is called. Parameters key:Object identity of the object to create createParameter:Object parameters passed to `Cacheable.createIdentity()` Returns:Cacheable a reference to the cached object, or `null` if the object cannot be created Exceptions StandardException: if the object is already in the cache, or if some other error occurs See Also `Cacheable#createIdentity(Object, Object)`

public Cacheable create(Object key, Object createParameter) throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.create.

Create an object in the cache. The object is kept until release() is called.

Parameters

key:Object: identity of the object to create
createParameter:Object: parameters passed to Cacheable.createIdentity()

Returns:Cacheable

a reference to the cached object, or null if the object cannot be created

Exceptions

StandardException:: if the object is already in the cache, or if some other error occurs

deregisterMBean	back to summary
public void deregisterMBean() Implements org.apache.derby.iapi.services.cache.CacheManager.deregisterMBean. Doc from org.apache.derby.iapi.services.cache.CacheManager.deregisterMBean. Deregister the MBean that monitors this cache. If there is no MBean for this instance, this is a no-op. Annotations @Override

deregisterMBean

back to summary

public void deregisterMBean()

Implements org.apache.derby.iapi.services.cache.CacheManager.deregisterMBean.

Doc from org.apache.derby.iapi.services.cache.CacheManager.deregisterMBean.

Deregister the MBean that monitors this cache. If there is no MBean for this instance, this is a no-op.

Annotations

@Override

discard back to summary

discard	back to summary
public boolean discard(Matchable partialKey) Implements org.apache.derby.iapi.services.cache.CacheManager.discard. Discard all unused objects that match a partial key. Dirty objects will not be cleaned before their removal. Parameters partialKey:Matchable the partial (or exact) key, or `null` to match all keys Returns:boolean `true` if all matching objects were removed, `false` otherwise

public boolean discard(Matchable partialKey)

Implements org.apache.derby.iapi.services.cache.CacheManager.discard.

Discard all unused objects that match a partial key. Dirty objects will not be cleaned before their removal.

Parameters

partialKey:Matchable: the partial (or exact) key, or null to match all keys

Returns:boolean

true if all matching objects were removed, false otherwise

evictEntry back to summary

evictEntry	back to summary
pack-priv void evictEntry(Object key) Evict an entry to make room for a new entry that is being inserted into the cache. Clear the identity of its `Cacheable` and set it to `null`. When this method is called, the caller has already chosen the `Cacheable` for reuse. Therefore, this method won't call `CacheEntry.free()` as that would make the `Cacheable` free for reuse by other entries as well. The caller must have locked the entry that is about to be evicted. Parameters key:Object identity of the entry to remove

pack-priv void evictEntry(Object key)

Evict an entry to make room for a new entry that is being inserted into the cache. Clear the identity of its Cacheable and set it to null. When this method is called, the caller has already chosen the Cacheable for reuse. Therefore, this method won't call CacheEntry.free() as that would make the Cacheable free for reuse by other entries as well.

The caller must have locked the entry that is about to be evicted.

Parameters

key:Object: identity of the entry to remove

find back to summary

find	back to summary
public Cacheable find(Object key) throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.find. Find an object in the cache. If it is not present, add it to the cache. The returned object is kept until `release()` is called. Parameters key:Object identity of the object to find Returns:Cacheable the cached object, or `null` if it cannot be found Exceptions StandardException: Doc from org.apache.derby.iapi.services.cache.CacheManager.find. Standard Derby error policy.

public Cacheable find(Object key) throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.find.

Find an object in the cache. If it is not present, add it to the cache. The returned object is kept until release() is called.

Parameters

key:Object: identity of the object to find

Returns:Cacheable

the cached object, or null if it cannot be found

Exceptions

StandardException:

Doc from org.apache.derby.iapi.services.cache.CacheManager.find.

Standard Derby error policy.

findCached back to summary

findCached	back to summary
public Cacheable findCached(Object key) throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.findCached. Find an object in the cache. If it is not present, return `null`. The returned object is kept until `release()` is called. Parameters key:Object identity of the object to find Returns:Cacheable the cached object, or `null` if it's not in the cache Exceptions StandardException: Doc from org.apache.derby.iapi.services.cache.CacheManager.findCached. Standard Derby error policy.

public Cacheable findCached(Object key) throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.findCached.

Find an object in the cache. If it is not present, return null. The returned object is kept until release() is called.

Parameters

key:Object: identity of the object to find

Returns:Cacheable

the cached object, or null if it's not in the cache

Exceptions

StandardException:

Doc from org.apache.derby.iapi.services.cache.CacheManager.findCached.

Standard Derby error policy.

getAllocatedEntries	back to summary
pack-priv long getAllocatedEntries() Get the number of allocated entries in the cache.

getBackgroundCleaner	back to summary
pack-priv BackgroundCleaner getBackgroundCleaner()

getCollectAccessCounts	back to summary
pack-priv boolean getCollectAccessCounts() Check if collection of hit/miss/eviction counts is enabled.

getEntry	back to summary
private CacheEntry getEntry(Object key) Get the entry associated with the specified key from the cache. If the entry does not exist, insert an empty one and return it. The returned entry is always locked for exclusive access by the current thread, but not kept. If another thread is currently setting the identity of this entry, this method will block until the identity has been set. Parameters key:Object the identity of the cached object Returns:CacheEntry an entry for the specified key, always locked

getEntry

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private CacheEntry getEntry(Object key)

Get the entry associated with the specified key from the cache. If the entry does not exist, insert an empty one and return it. The returned entry is always locked for exclusive access by the current thread, but not kept. If another thread is currently setting the identity of this entry, this method will block until the identity has been set.

Parameters

key:Object: the identity of the cached object

Returns:CacheEntry

an entry for the specified key, always locked

getEvictionCount	back to summary
pack-priv long getEvictionCount() Get the number of evictions from the cache.

getHitCount	back to summary
pack-priv long getHitCount() Get the number of cache hits.

getMaxEntries	back to summary
pack-priv long getMaxEntries() Get the maximum number of entries in the cache.

getMissCount	back to summary
pack-priv long getMissCount() Get the number of cache misses.

getReplacementPolicy back to summary

getReplacementPolicy	back to summary
pack-priv ReplacementPolicy getReplacementPolicy() Return the `ReplacementPolicy` instance for this cache. Returns:ReplacementPolicy replacement policy

pack-priv ReplacementPolicy getReplacementPolicy()

Return the ReplacementPolicy instance for this cache.

Returns:ReplacementPolicy: replacement policy

getSystemModule	back to summary
private static Object getSystemModule(final String factoryInterface) Must be private so that user code can't call this entry point.

getUsedEntries	back to summary
pack-priv long getUsedEntries() Get the number of cached objects.

insertIntoFreeSlot back to summary

insertIntoFreeSlot	back to summary
private Cacheable insertIntoFreeSlot(Object key, CacheEntry entry) throws StandardException Insert a `CacheEntry` into a free slot in the `ReplacementPolicy`'s internal data structure, and return a `Cacheable` that the caller can reuse. The entry must have been locked before this method is called. Parameters key:Object the identity of the object being inserted entry:CacheEntry the entry that is being inserted Returns:Cacheable a `Cacheable` object that the caller can reuse Exceptions StandardException: if an error occurs while inserting the entry or while allocating a new `Cacheable`

private Cacheable insertIntoFreeSlot(Object key, CacheEntry entry) throws StandardException

Insert a CacheEntry into a free slot in the ReplacementPolicy's internal data structure, and return a Cacheable that the caller can reuse. The entry must have been locked before this method is called.

Parameters

key:Object: the identity of the object being inserted
entry:CacheEntry: the entry that is being inserted

Returns:Cacheable

a Cacheable object that the caller can reuse

Exceptions

StandardException:: if an error occurs while inserting the entry or while allocating a new Cacheable

registerMBean back to summary

registerMBean	back to summary
public void registerMBean(String dbName) throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.registerMBean. Doc from org.apache.derby.iapi.services.cache.CacheManager.registerMBean. Register an MBean that allows user to monitor this cache instance. This is a no-op if the platform does not support Java Management Extensions (JMX). The MBean will be automatically deregistered when `shutdown()` is called, or it can be manually deregistered by calling `deregisterMBean()`. Parameters dbName:String the unique name of the database to which the cache belongs Annotations @Override Exceptions StandardException: if an error occurs when registering the MBean

public void registerMBean(String dbName) throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.registerMBean.

Doc from org.apache.derby.iapi.services.cache.CacheManager.registerMBean.

Register an MBean that allows user to monitor this cache instance. This is a no-op if the platform does not support Java Management Extensions (JMX).

The MBean will be automatically deregistered when shutdown() is called, or it can be manually deregistered by calling deregisterMBean().

Parameters

dbName:String: the unique name of the database to which the cache belongs

Annotations

@Override

Exceptions

StandardException:: if an error occurs when registering the MBean

release back to summary

release	back to summary
public void release(Cacheable item) Implements org.apache.derby.iapi.services.cache.CacheManager.release. Release an object that has been fetched from the cache with `find()`, `findCached()` or `create()`. Parameters item:Cacheable a `Cacheable` value

public void release(Cacheable item)

Implements org.apache.derby.iapi.services.cache.CacheManager.release.

Release an object that has been fetched from the cache with find(), findCached() or create().

Parameters

item:Cacheable: a Cacheable value

remove back to summary

remove	back to summary
public void remove(Cacheable item) throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.remove. Remove an object from the cache. The object must previously have been fetched from the cache with `find()`, `findCached()` or `create()`. The user of the cache must make sure that only one caller executes this method on a cached object. This method will wait until the object has been removed (its keep count must drop to zero before it can be removed). Parameters item:Cacheable the object to remove from the cache Exceptions StandardException: Doc from org.apache.derby.iapi.services.cache.CacheManager.remove. Standard Derby error policy.

public void remove(Cacheable item) throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.remove.

Remove an object from the cache. The object must previously have been fetched from the cache with find(), findCached() or create(). The user of the cache must make sure that only one caller executes this method on a cached object. This method will wait until the object has been removed (its keep count must drop to zero before it can be removed).

Parameters

item:Cacheable: the object to remove from the cache

Exceptions

StandardException:

Doc from org.apache.derby.iapi.services.cache.CacheManager.remove.

Standard Derby error policy.

removeEntry back to summary

removeEntry	back to summary
private void removeEntry(Object key) Remove an entry from the cache. Its `Cacheable` is cleared and made available for other entries. This method should only be called if the entry is present in the cache and locked by the current thread. Parameters key:Object the identity of the entry to remove

private void removeEntry(Object key)

Remove an entry from the cache. Its Cacheable is cleared and made available for other entries. This method should only be called if the entry is present in the cache and locked by the current thread.

Parameters

key:Object: the identity of the entry to remove

setCollectAccessCounts	back to summary
pack-priv void setCollectAccessCounts(boolean collect) Enable or disable collection of hit/miss/eviction counts.

settingIdentityComplete back to summary

settingIdentityComplete	back to summary
private void settingIdentityComplete(Object key, CacheEntry entry, Cacheable item) Complete the setting of the identity. This includes notifying the threads that are waiting for the setting of the identity to complete, so that they can wake up and continue. If setting the identity failed, the entry will be removed from the cache. Parameters key:Object the identity of the object being inserted entry:CacheEntry the entry which is going to hold the cached object item:Cacheable a `Cacheable` object with the identity set (if the identity was successfully set), or `null` if setting the identity failed

private void settingIdentityComplete(Object key, CacheEntry entry, Cacheable item)

Complete the setting of the identity. This includes notifying the threads that are waiting for the setting of the identity to complete, so that they can wake up and continue. If setting the identity failed, the entry will be removed from the cache.

Parameters

key:Object: the identity of the object being inserted
entry:CacheEntry: the entry which is going to hold the cached object
item:Cacheable: a Cacheable object with the identity set (if the identity was successfully set), or null if setting the identity failed

shutdown	back to summary
public void shutdown() throws StandardException Implements org.apache.derby.iapi.services.cache.CacheManager.shutdown. Shut down the cache. Exceptions StandardException: Doc from org.apache.derby.iapi.services.cache.CacheManager.shutdown. Standard Derby error policy.

shutdown

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public void shutdown() throws StandardException

Implements org.apache.derby.iapi.services.cache.CacheManager.shutdown.

Shut down the cache.

Exceptions

StandardException:

Doc from org.apache.derby.iapi.services.cache.CacheManager.shutdown.

Standard Derby error policy.

useDaemonService

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public void useDaemonService(DaemonService daemon)

Implements org.apache.derby.iapi.services.cache.CacheManager.useDaemonService.

Specify a daemon service that can be used to perform operations in the background. Callers must provide enough synchronization so that they have exclusive access to the cache when this method is called.

Parameters

daemon:DaemonService: the daemon service to use

values back to summary

public Collection<Cacheable> values()

Implements org.apache.derby.iapi.services.cache.CacheManager.values.

Return a collection view of all the Cacheables in the cache. There is no guarantee that the objects in the collection can be accessed in a thread-safe manner once this method has returned, so it should only be used for diagnostic purposes. (Currently, it is only used by the StatementCache VTI.)

Returns:Collection<Cacheable>: a collection view of the objects in the cache

pack-priv final Class ConcurrentCache

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail