EHCACHE 2.5 DOCUMENTATION PDF

Caching data is a typical optimization in modern applications, and so Play provides a global cache. Note: An important point about the cache is that it behaves just like a cache should: the data you just stored may just go missing. For any data stored in the cache, a regeneration strategy needs to be put in place in case the data goes missing. This philosophy is one of the fundamentals behind Play, and is different from Java EE, where the session is expected to retain values throughout its lifetime.

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Caches can be configured in Ehcache either declaratively in XML, or by creating caches programmatically and specifying their parameters in the constructor. While both approaches are fully supported, it is generally a good idea to separate the cache configuration from runtime use. There are also these benefits:. Caches consume memory, and disk space. They need to be carefully tuned.

You can see the total effect in a configuration file. You could do this all in code, but it would not as visible. While a defaultCache configuration is not required, an error is generated if caches are created by name programmatically with no defaultCache loaded. The Ehcache documentation focuses on XML declarative configuration. Programmatic configuration is explored in certain examples and is documented in Javadocs.

Ehcache is redistributed by many projects, some of which might not provide an up-to-date sample Ehcache XML configuration file. If so, download Ehcache. The latest ehcache. After a Cache has been started, its configuration is not generally changeable. However, since Ehcache 2.

In the current version of Ehcache, this includes the following:. The maximum number of seconds an element can exist in the cache regardless of use. The element expires at this limit and will no longer be returned from the cache. The maximum number of seconds an element can exist in the cache without being accessed.

This example shows how to dynamically modify the cache configuration of a running cache:. In ehcache. BigMemory introduced the OffHeap store, where sizing of caches is also allowed. To learn more about sizing caches, see How to Size Caches. Pinning of caches or specific elements is discussed in Pinning, Expiration, and Eviction. When a cache starts up, the stores are always empty.

Ehcache provides a BootstrapCacheLoader mechanism to overcome this. The BootstrapCacheLoader is run before the cache is set to alive. If synchronous, loading completes before the CacheManager starts, or if asynchronous, the CacheManager starts but loading continues aggressively rather than waiting for elements to be requested, which is a lazy loading approach. Replicated caches provide a bootstrap mechanism that populates them.

For example, the following is the JGroups bootstrap cache loader:. A cache can be configured to copy the data, rather than return reference to it on get or put. This is configured using the copyOnRead and copyOnWrite attributes of cache and defaultCache elements in your configuration or programmatically as follows:. The default implementation uses serialization to copy elements.

You can provide your own implementation of net. CopyStrategy like this:. Per cache, a single instance of your CopyStrategy is used. Therefore, in your implementation of CopyStrategy. Setting this system property to true using java -Dnet. If disabled, no elements can be added to a cache puts are silently discarded. When LRU is selected as the eviction policy, set this system property to true using java -Dnet.

This is provided for ease of migration. Ehcache configuration files must comply with the Ehcache XML schema, ehcache. Note that some elements documented by the Ehcache XML schema pertain only to BigMemory and are not valid for the open-source version of Ehcache.

If the CacheManager default constructor or factory method is called, Ehcache looks for a file called ehcache. If Ehcache does not find that file, Ehcache looks for ehcache-failsafe. If the default configuration is used, Ehcache will emit a warning to remind the user to set up a proper configuration. The meaning of the elements and attributes are explained in the section on ehcache.

The update checker is used to see if you have the latest version of Ehcache. It is also used to get non-identifying feedback on the operating system architectures using Ehcache.

To disable the check, do one of the following:. The outer ehcache element takes an updateCheck attribute, which is set to false as in the following example. Prior to ehcache Starting with ehcache The non-default creation methods allow a configuration file to be specified with any name you want. It is an error to use the same configuration for multiple CacheManagers, because settings such as directory paths and listener ports will conflict.

Ehcache will attempt to resolve conflicts and will emit a warning reminding the user to configure a separate configuration for multiple CacheManagers with conflicting settings. The sample ehcache. It contains comments to help you configure each element. Note that some elements documented in the sample Ehcache XML file pertain only to BigMemory and are not valid for the open-source version of Ehcache.

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Documentation

Caches can be configured in Ehcache either declaratively in XML, or by creating caches programmatically and specifying their parameters in the constructor. While both approaches are fully supported, it is generally a good idea to separate the cache configuration from runtime use. There are also these benefits:. Caches consume memory, and disk space. They need to be carefully tuned.

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Ehcache Core 2.5.2 API

Ehcache is an open source, standards-based cache that boosts performance, offloads your database, and simplifies scalability. It's the most widely-used Java-based cache because it's robust, proven, full-featured, and integrates with other popular libraries and frameworks. Watch for continued rapid improvements to features, stability and performance of the 3. Toggle navigation By.

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