ano-prise Caches.

ano-prise offers a set of built-in caches for object caching in services. Currently we offer two types of caches which have several implementations:

Cache - roundrobin caches for hit-reduction.

Definition

RoundRobin caches have a limited size. If the cache is full a newly placed element will overwrite the least recently placed element. The access time of the element doesn't matter, only the put order is considered. This is pretty effective and simple at same time.

Implementations

Following implementations of the RoundRobin Cache are available:

Cache

Effect

RoundRobinHardwiredCache

Cache of defined size and capacity. Useful if the size of the en-cached objects is known (for example user objects

RoundRobinSoftReferenceCache

Cache of defined capacity. However it uses SoftReferences instead of direct References, which prevents the cache from going OutOfMemory. Useful for en-caching objects of different sizes, for example messages, texts etc

ExpiringCache

 A wrapper around another cache implementation which adds an expiration check to each en-cached element and removes
it on access if the element has expired

Interface

SVN: ano-prise/trunk/java/net/anotheria/anoprise/cache/Cache.java

Unknown macro: {groovy}

def data = new URL('http://svn.anotheria.net/opensource/ano-prise/trunk/java/net/anotheria/anoprise/cache/Cache.java').getText()
println '

' + data + '

'

BoundedCache

Definition

BoundedCache differes from RoundRobin cache in only one aspect, if its full, it refuses to accept more elements, until some elements are removed. To enable this behavior it offers no put method, but an offer method instead. If offer returns true the element is accepted, otherwise it returns false.

Implementations

Following implementations of the RoundRobin Cache are available:

Cache

Effect

BoundedHardwiredCache

Cache of defined size and capacity. Useful if the size of the en-cached objects is known (for example user objects

BoundedSoftReferenceCache

yet missing

BoundedExpiringCache

 yet missing

Interface

SVN: ano-prise/trunk/java/net/anotheria/anoprise/cache/BoundedCache.java

Unknown macro: {groovy}

def data = new URL('http://svn.anotheria.net/opensource/ano-prise/trunk/java/net/anotheria/anoprise/cache/BoundedCache.java').getText()
println '

' + data + '

'

Caches Utility.

Similar to Collections or Arrays in Core Java, Caches offers some useful methods to create preconfigured caches.

Methods

public static final <K,V> Cache<K,V> createSoftReferenceCache(String name)

public static final <K,V> Cache<K,V> createSoftReferenceCache(String name, int startSize, int maxSize)

public static final <K,V> Cache<K,V> createHardwiredCache(String name)

public static final <K,V> Cache<K,V> createHardwiredCache(String name, int startSize, int maxSize)

public static final <K,V> Cache<K,V> createHardwiredExpiringCache(String name, int startSize, int maxSize, int expirationTime)

public static final <K,V> Cache<K,V> createSoftReferenceExpiringCache(String name, int startSize, int maxSize, int expirationTime)

public static final <K,V> Cache<K,V> createConfigurableSoftReferenceCache(String name)

public static final <K,V> Cache<K,V> createConfigurableHardwiredCache(String name)

For details on the methods please check the javadoc documentation.

Configuration

Configurable caches support dynamic configuration and re-configuration via ConfigureMe.
The configuration supports three configuration options:

Option

Type

 Meaning

cacheOn

Boolean

Switches the cache on and off.

startSize

Int

Initial size of the cache. If the size is reached the cache will enlarge itself.

maxSize

Int

Max size of the cache. The cache won't enlarge itself above this.

Example of a configuration:

SVN: ano-prise/trunk/etc/appdata/cachetest.json

Unknown macro: {groovy}

def data = new URL('http://svn.anotheria.net/opensource/ano-prise/trunk/etc/appdata/cachetest.json').getText()
println '

' + data + '

'
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