Package javax.cache.configuration

Class MutableConfiguration<K,V>

java.lang.Object

javax.cache.configuration.MutableConfiguration<K,V>

Type Parameters:

K - the type of keys maintained the cache

V - the type of cached values

All Implemented Interfaces:

Serializable, CompleteConfiguration<K,V>, Configuration<K,V>

public class MutableConfiguration<K,V>
extends Object
implements CompleteConfiguration<K,V>

A simple mutable implementation of a Configuration.

Since:

1.0

Author:

Brian Oliver, Greg Luck

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Factory<CacheLoader<K,V>>	cacheLoaderFactory	The Factory for the CacheLoader.
protected Factory<CacheWriter<? super K,? super V>>	cacheWriterFactory	The Factory for the CacheWriter.
protected Factory<ExpiryPolicy>	expiryPolicyFactory	The Factory for the ExpiryPolicy.
protected boolean	isManagementEnabled	Whether management is enabled
protected boolean	isReadThrough	A flag indicating if "read-through" mode is required.
protected boolean	isStatisticsEnabled	A flag indicating if statistics gathering is enabled.
protected boolean	isStoreByValue	A flag indicating if the cache will be store-by-value or store-by-reference.
protected boolean	isWriteThrough	A flag indicating if "write-through" mode is required.
protected Class<K>	keyType	The type of keys for Caches configured with this Configuration.
protected HashSet<CacheEntryListenerConfiguration<K,V>>	listenerConfigurations	The CacheEntryListenerConfigurations for the Configuration.
static long	serialVersionUID	The serialVersionUID required for Serializable.
protected Class<V>	valueType	The type of values for Caches configured with this Configuration.

Constructor Summary

Constructors

Constructor	Description
MutableConfiguration()	Default JavaBean constructor.
MutableConfiguration(CompleteConfiguration<K,V> configuration)	Constructs a MutableConfiguration based on another CompleteConfiguration.

Method Summary

Modifier and Type	Method	Description
MutableConfiguration<K,V>	addCacheEntryListenerConfiguration(CacheEntryListenerConfiguration<K,V> cacheEntryListenerConfiguration)	Add a configuration for a CacheEntryListener.
boolean	equals(Object object)
Iterable<CacheEntryListenerConfiguration<K,V>>	getCacheEntryListenerConfigurations()	Obtains the CacheEntryListenerConfigurations for CacheEntryListeners to be configured on a Cache.
Factory<CacheLoader<K,V>>	getCacheLoaderFactory()	Gets the Factory for the CacheLoader, if any.
Factory<CacheWriter<? super K,? super V>>	getCacheWriterFactory()	Gets the Factory for the CacheWriter, if any.
Factory<ExpiryPolicy>	getExpiryPolicyFactory()	Gets the Factory for the ExpiryPolicy to be used for caches.
Class<K>	getKeyType()	Determines the required type of keys for Caches configured with this Configuration.
Class<V>	getValueType()	Determines the required type of values for Caches configured with this Configuration.
int	hashCode()
boolean	isManagementEnabled()	Checks whether management is enabled on this cache.
boolean	isReadThrough()	Determines if a Cache should operate in read-through mode.
boolean	isStatisticsEnabled()	Checks whether statistics collection is enabled in this cache.
boolean	isStoreByValue()	Whether storeByValue (true) or storeByReference (false).
boolean	isWriteThrough()	Determines if a Cache should operate in write-through mode.
MutableConfiguration<K,V>	removeCacheEntryListenerConfiguration(CacheEntryListenerConfiguration<K,V> cacheEntryListenerConfiguration)	Remove a configuration for a CacheEntryListener.
MutableConfiguration<K,V>	setCacheLoaderFactory(Factory<? extends CacheLoader<K,V>> factory)	Set the CacheLoader factory.
MutableConfiguration<K,V>	setCacheWriterFactory(Factory<? extends CacheWriter<? super K,? super V>> factory)	Set the CacheWriter factory.
MutableConfiguration<K,V>	setExpiryPolicyFactory(Factory<? extends ExpiryPolicy> factory)	Set the Factory for the ExpiryPolicy.
MutableConfiguration<K,V>	setManagementEnabled(boolean enabled)	Sets whether management is enabled on a cache.
MutableConfiguration<K,V>	setReadThrough(boolean isReadThrough)	Set if read-through caching should be used.
MutableConfiguration<K,V>	setStatisticsEnabled(boolean enabled)	Sets whether statistics gathering is enabled on a cache.
MutableConfiguration<K,V>	setStoreByValue(boolean isStoreByValue)	Set if a configured cache should use store-by-value or store-by-reference semantics.
MutableConfiguration<K,V>	setTypes(Class<K> keyType, Class<V> valueType)	Sets the expected type of keys and values for a Cache configured with this Configuration.
MutableConfiguration<K,V>	setWriteThrough(boolean isWriteThrough)	Set if write-through caching should be used.

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

public static final long serialVersionUID

The serialVersionUID required for Serializable.

See Also:

Constant Field Values

keyType

protected Class<K> keyType

The type of keys for Caches configured with this Configuration.

valueType

protected Class<V> valueType

The type of values for Caches configured with this Configuration.

listenerConfigurations

protected HashSet<CacheEntryListenerConfiguration<K,V>> listenerConfigurations

The CacheEntryListenerConfigurations for the Configuration.

cacheLoaderFactory

protected Factory<CacheLoader<K,V>> cacheLoaderFactory

The Factory for the CacheLoader.

cacheWriterFactory

protected Factory<CacheWriter<? super K,? super V>> cacheWriterFactory

The Factory for the CacheWriter.

expiryPolicyFactory

protected Factory<ExpiryPolicy> expiryPolicyFactory

The Factory for the ExpiryPolicy.

isReadThrough

protected boolean isReadThrough

A flag indicating if "read-through" mode is required.

isWriteThrough

protected boolean isWriteThrough

A flag indicating if "write-through" mode is required.

isStatisticsEnabled

protected boolean isStatisticsEnabled

A flag indicating if statistics gathering is enabled.

isStoreByValue

protected boolean isStoreByValue

A flag indicating if the cache will be store-by-value or store-by-reference.

isManagementEnabled

protected boolean isManagementEnabled

Whether management is enabled

Constructor Detail

MutableConfiguration

public MutableConfiguration()

Default JavaBean constructor.

Creates a default configuration. Default configurations have no runtime type checking and are set for eternal expiry.

To enable runtime type enforcement, if supported by the implementation, call setTypes(java.lang.Class<K>, java.lang.Class<V>) after construction.

After construction set any other configuration parameters in the fluent style. e.g.

 CacheConfiguration<Integer, String> = new MutableConfiguration<Integer, String>()
             .setTypes(Integer.class, String.class)
             .setReadThrough(true)
             . . .
 

See Also:

setTypes(Class, Class)

MutableConfiguration

public MutableConfiguration(CompleteConfiguration<K,V> configuration)

Constructs a MutableConfiguration based on another CompleteConfiguration.

Parameters:

configuration - the CompleteConfiguration

Method Detail

getKeyType

public Class<K> getKeyType()

Determines the required type of keys for Caches configured with this Configuration.

Specified by:

getKeyType in interface Configuration<K,V>

Returns:

the key type or Object.class if the type is undefined

getValueType

public Class<V> getValueType()

Determines the required type of values for Caches configured with this Configuration.

Specified by:

getValueType in interface Configuration<K,V>

Returns:

the value type or Object.class if the type is undefined

setTypes

public MutableConfiguration<K,V> setTypes(Class<K> keyType,
                                          Class<V> valueType)

Sets the expected type of keys and values for a Cache configured with this Configuration. Setting both to Object.class means type-safety checks are not required.

This is used by CacheManager to ensure that the key and value types are the same as those configured for the Cache prior to returning a requested cache from this method.

Implementations may further perform type checking on mutative cache operations and throw a ClassCastException if these checks fail.

Parameters:

keyType - the expected key type

valueType - the expected value type

Returns:

the MutableConfiguration to permit fluent-style method calls

Throws:

NullPointerException - should the key or value type be null

See Also:

CacheManager.getCache(String, Class, Class)

getCacheEntryListenerConfigurations

public Iterable<CacheEntryListenerConfiguration<K,V>> getCacheEntryListenerConfigurations()

Obtains the CacheEntryListenerConfigurations for CacheEntryListeners to be configured on a Cache.

Specified by:

getCacheEntryListenerConfigurations in interface CompleteConfiguration<K,V>

Returns:

an Iterable over the CacheEntryListenerConfigurations

addCacheEntryListenerConfiguration

public MutableConfiguration<K,V> addCacheEntryListenerConfiguration(CacheEntryListenerConfiguration<K,V> cacheEntryListenerConfiguration)

Add a configuration for a CacheEntryListener.

Parameters:

cacheEntryListenerConfiguration - the CacheEntryListenerConfiguration

Returns:

the MutableConfiguration to permit fluent-style method calls

Throws:

IllegalArgumentException - is the same CacheEntryListenerConfiguration is used more than once

removeCacheEntryListenerConfiguration

public MutableConfiguration<K,V> removeCacheEntryListenerConfiguration(CacheEntryListenerConfiguration<K,V> cacheEntryListenerConfiguration)

Remove a configuration for a CacheEntryListener.

Parameters:

cacheEntryListenerConfiguration - the CacheEntryListenerConfiguration to remove

Returns:

the MutableConfiguration to permit fluent-style method calls

getCacheLoaderFactory

public Factory<CacheLoader<K,V>> getCacheLoaderFactory()

Gets the Factory for the CacheLoader, if any.

A CacheLoader should be configured for "Read Through" caches to load values when a cache miss occurs using either the Cache.get(Object) and/or Cache.getAll(java.util.Set) methods.

The default value is null.

Specified by:

getCacheLoaderFactory in interface CompleteConfiguration<K,V>

Returns:

the Factory for the CacheLoader or null if none has been set.

setCacheLoaderFactory

public MutableConfiguration<K,V> setCacheLoaderFactory(Factory<? extends CacheLoader<K,V>> factory)

Set the CacheLoader factory.

Parameters:

factory - the CacheLoader Factory

Returns:

the MutableConfiguration to permit fluent-style method calls

getCacheWriterFactory

public Factory<CacheWriter<? super K,? super V>> getCacheWriterFactory()

Gets the Factory for the CacheWriter, if any.

The default value is null.

Specified by:

getCacheWriterFactory in interface CompleteConfiguration<K,V>

Returns:

the Factory for the CacheWriter or null if none has been set.

setCacheWriterFactory

public MutableConfiguration<K,V> setCacheWriterFactory(Factory<? extends CacheWriter<? super K,? super V>> factory)

Set the CacheWriter factory.

Parameters:

factory - the CacheWriter Factory

Returns:

the MutableConfiguration to permit fluent-style method calls

getExpiryPolicyFactory

public Factory<ExpiryPolicy> getExpiryPolicyFactory()

Gets the Factory for the ExpiryPolicy to be used for caches.

The default value is a Factory that will produce a EternalExpiryPolicy instance.

Specified by:

getExpiryPolicyFactory in interface CompleteConfiguration<K,V>

Returns:

the Factory for ExpiryPolicy (must not be null)

setExpiryPolicyFactory

public MutableConfiguration<K,V> setExpiryPolicyFactory(Factory<? extends ExpiryPolicy> factory)

Set the Factory for the ExpiryPolicy. If null is specified the default ExpiryPolicy is used.

Only one expiry policy can be set for a cache. The last policy applied before cache construction will be the one used.

Parameters:

factory - the ExpiryPolicy Factory

Returns:

the MutableConfiguration to permit fluent-style method calls

isReadThrough

public boolean isReadThrough()

Determines if a Cache should operate in read-through mode.

When in "read-through" mode, cache misses that occur due to cache entries not existing as a result of performing a "get" will appropriately cause the configured CacheLoader to be invoked.

The default value is false.

Specified by:

isReadThrough in interface CompleteConfiguration<K,V>

Returns:

true when a Cache is in "read-through" mode.

See Also:

CompleteConfiguration.getCacheLoaderFactory()

setReadThrough

public MutableConfiguration<K,V> setReadThrough(boolean isReadThrough)

Set if read-through caching should be used.

It is an invalid configuration to set this to true without specifying a CacheLoader Factory.

Parameters:

isReadThrough - true if read-through is required

Returns:

the MutableConfiguration to permit fluent-style method calls

isWriteThrough

public boolean isWriteThrough()

Determines if a Cache should operate in write-through mode.

When in "write-through" mode, cache updates that occur as a result of performing "put" operations called via one of Cache.put(Object, Object), Cache.getAndRemove(Object), Cache.removeAll(), Cache.getAndPut(Object, Object) Cache.getAndRemove(Object), Cache.getAndReplace(Object, Object), Cache.invoke(Object, javax.cache.processor.EntryProcessor, Object...), Cache.invokeAll(java.util.Set, javax.cache.processor.EntryProcessor, Object...) will appropriately cause the configured CacheWriter to be invoked.

The default value is false.

Specified by:

isWriteThrough in interface CompleteConfiguration<K,V>

Returns:

true when a Cache is in "write-through" mode.

See Also:

CompleteConfiguration.getCacheWriterFactory()

setWriteThrough

public MutableConfiguration<K,V> setWriteThrough(boolean isWriteThrough)

Set if write-through caching should be used.

It is an invalid configuration to set this to true without specifying a CacheWriter Factory.

Parameters:

isWriteThrough - true if write-through is required

Returns:

the MutableConfiguration to permit fluent-style method calls

isStoreByValue

public boolean isStoreByValue()

Whether storeByValue (true) or storeByReference (false). When true, both keys and values are stored by value.

When false, both keys and values are stored by reference. Caches stored by reference are capable of mutation by any threads holding the reference. The effects are:

• if the key is mutated, then the key may not be retrievable or removable
• if the value is mutated, then all threads in the JVM can potentially observe those mutations, subject to the normal Java Memory Model rules.

Storage by reference only applies to the local heap. If an entry is moved off heap it will need to be transformed into a representation. Any mutations that occur after transformation may not be reflected in the cache.

When a cache is storeByValue, any mutation to the key or value does not affect the key of value stored in the cache.

The default value is true.

Specified by:

isStoreByValue in interface Configuration<K,V>

Returns:

true if the cache is store by value

setStoreByValue

public MutableConfiguration<K,V> setStoreByValue(boolean isStoreByValue)

Set if a configured cache should use store-by-value or store-by-reference semantics.

Parameters:

isStoreByValue - true if store-by-value is required, false for store-by-reference

Returns:

the MutableConfiguration to permit fluent-style method calls

isStatisticsEnabled

public boolean isStatisticsEnabled()

Checks whether statistics collection is enabled in this cache.

The default value is false.

Specified by:

isStatisticsEnabled in interface CompleteConfiguration<K,V>

Returns:

true if statistics collection is enabled

setStatisticsEnabled

public MutableConfiguration<K,V> setStatisticsEnabled(boolean enabled)

Sets whether statistics gathering is enabled on a cache.

Statistics may be enabled or disabled at runtime via CacheManager.enableStatistics(String, boolean).

Parameters:

enabled - true to enable statistics, false to disable.

Returns:

the MutableConfiguration to permit fluent-style method calls

isManagementEnabled

public boolean isManagementEnabled()

Checks whether management is enabled on this cache.

The default value is false.

Specified by:

isManagementEnabled in interface CompleteConfiguration<K,V>

Returns:

true if management is enabled

setManagementEnabled

public MutableConfiguration<K,V> setManagementEnabled(boolean enabled)

Sets whether management is enabled on a cache.

Management may be enabled or disabled at runtime via CacheManager.enableManagement(String, boolean).

Parameters:

enabled - true to enable statistics, false to disable.

Returns:

the MutableConfiguration to permit fluent-style method calls

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object object)

Overrides:

equals in class Object