Infinispan Concepts

External

• Infinispan 6 User Guide http://infinispan.org/docs/6.0.x/user_guide/user_guide.html

Internal

• Infinispan
• WildFly Infinispan Subsystem Concepts

Cache Container

A cache container is the runtime structure that instantiates and manages one or more caches. In case of clustered caches, the cache container encapsulates the networking mechanisms required to maintain state across more than one JVM for its caches, including a JGroups stack.

Each cache container declares a set of caches that share a global configuration, so caches belonging to different cache containers can have different transport configurations, optimized for different use cases.

The cache container implementations are heavyweight objects. There should be possible to use just one cache container per JVM, unless specific configuration requires the availability of more than one instance - but in this case there will be a minimal and finite number of such instances.

A WildFly cache container is the WildFly service wrapper around an Infinispan cache container. Each <cache-container> element eventually results in a org.infinispan.manager.DefaultCacheManager instance being created in the JVM.

The corresponding WildFly/JDG configuration element is <cache-container>. The <cache-container> elements are children of the "infinispan" (for WildFly) or "infinispan:server:core:" (for JDG) subsystems. More details about cache container configuration can be found here:

Cache Container Configuration

From an API perspective, the cache container is the primary API mechanism to retrieve cache instances or create cache instances on demand. For more details see:

Cache Container API

Cache Manager

A cache manager and a cache container represent similar concepts.

Cache

Default Cache and Named Caches

Each cache container has a default cache instance. The default cache can be retrieved via the CacheManager.getCache() API.

Named caches are retrieved via CacheManager.getCache(String name) API. Therefore, note that the name attribute of named cache is both mandatory and unique for every named cache specified. Named caches have the same XML schema as the default cache so they inherit settings from the default cache while additional behavior can be specified or overridden.

The default cache for a specific cache container is configured using the default-cache configuration attribute.

Cache Store

A cache store implements the CacheLoader or CacheWriter interfaces, or both.

Cache stores are deployed in a chain. A cache read operation looks at all of the installed CacheLoaders, in the order they are installed, until it finds a valid and non-null element of data. When performing writes all cache CacheWriters are written to, except if the ignoreModifications element has been set to true for a specific cache writer

More details on cache store configuration:

Cache Store Configuration

Shared Cache Store

A shared cache store means that the cache store instance is shared among different cache instances. If "shared" is set to true prevents repeated and unnecessary writes of the same data to the cache loader by different cache instances.

Cache Store Preloading

If the store is configured to do preloading, when the cache starts, data stored in the cache loader will be pre-loaded into memory. This is particularly useful when data in the cache loader is needed immediately after startup and you want to avoid cache operations being delayed as a result of loading this data lazily. Can be used to provide a warm-cache on startup, however there is a performance penalty as startup time is affected by this process. Note that preloading is done in a local fashion, so any data loaded is only stored locally in the node. No replication or distribution of the preloaded data happens. Also, Infinispan only preloads up to the maximum configured number of entries in eviction.

Cache Store Passivation

http://infinispan.org/docs/6.0.x/user_guide/user_guide.html#cache-passivation

Cache Store Purge

If purge is set to true, it empties the specified cache store (if ignoreModifications is false) when the cache loader starts up.

Connecting to an Infinispan Server

HotRot

The HotRod connector is configured in the infinispan:server:endpoint Section.

memcached

The memcached connector is configured in the infinispan:server:endpoint Section.

REST

The REST connector is configured in the infinispan:server:endpoint Section.