javax.cache.management

Interface CacheMXBean

@MXBean
public interface CacheMXBean

A management bean for cache. It provides configuration information. It does not allow mutation of configuration or mutation of the cache.

Each cache's management object must be registered with an ObjectName that is unique and has the following type and attributes:

Type: javax.cache:type=CacheConfiguration

Required Attributes:

• CacheManager the URI of the CacheManager
• Cache the name of the Cache

Since:

1.0

Author:

Greg Luck, Yannis Cosmadopoulos

Method Summary

Methods

Modifier and Type	Method and Description
String	getKeyType() Determines the required type of keys for this Cache, if any.
String	getValueType() Determines the required type of values for this Cache, if any.
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.

Method Detail

getKeyType

String getKeyType()

Determines the required type of keys for this Cache, if any.

Returns:

the fully qualified class name of the key type, or "java.lang.Object" if the type is undefined.

getValueType

String getValueType()

Determines the required type of values for this Cache, if any.

Returns:

the fully qualified class name of the value type, or "java.lang.Object" if the type is undefined.

isReadThrough

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" call via one of Cache.get(K), Cache.getAll(java.util.Set<? extends K>), Cache.getAndRemove(K) and/or Cache.getAndReplace(K, V) will appropriately cause the configured CacheLoader to be invoked.

The default value is false.

Returns:

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

See Also:

CacheLoader

isWriteThrough

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(K, V), Cache.getAndRemove(K), Cache.removeAll(java.util.Set<? extends K>), Cache.getAndPut(K, V) Cache.getAndRemove(K), Cache.getAndReplace(K, V), Cache.invoke(K, javax.cache.processor.EntryProcessor<K, V, T>, java.lang.Object...) Cache.invokeAll(java.util.Set<? extends K>, javax.cache.processor.EntryProcessor<K, V, T>, java.lang.Object...)

will appropriately cause the configured CacheWriter to be invoked.

The default value is false.

Returns:

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

See Also:

CacheWriter

isStoreByValue

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.

Returns:

true if the cache is store by value

isStatisticsEnabled

boolean isStatisticsEnabled()

Checks whether statistics collection is enabled in this cache.

The default value is false.

Returns:

true if statistics collection is enabled

isManagementEnabled

boolean isManagementEnabled()

Checks whether management is enabled on this cache.

The default value is false.

Returns:

true if management is enabled