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## org.apache.cocoon.pipeline.caching
Class SimpleCache

    java.lang.Object
      org.apache.cocoon.pipeline.caching.AbstractCache
          org.apache.cocoon.pipeline.caching.SimpleCache

All Implemented Interfaces:
  Cache

    public class SimpleCache

extends AbstractCache

A very simple implementation of the `Cache` interface.
It uses a `WeakHashMap` as internal data store.

Constructor Summary
`SimpleCache()`

Method Summary
`protected void` | `doClear()` Actually clears the underlying storage.
`protected boolean` | `doRemove(CacheKey cacheKey)` Actually removes cached data from underlying storage.
`protected CacheValue` | `retrieve(CacheKey cacheKey)` Actually retrieves the `CacheValue` from the underlying storage. This method must return the previously stored value - even if it is not valid anymore.
`protected Set<CacheKey>` | `retrieveKeySet()` Actually retrieves the `Set` for `CacheKey` from underlying storage.
`protected void` | `store(CacheKey cacheKey, CacheValue cacheValue)` Actually stores the given `cacheValue` at the given `cacheKey` in the underlying storage. This method is to replace any previously stored `CacheValue` (if any).
`String` | `toString()`

Methods inherited from class org.apache.cocoon.pipeline.caching.AbstractCache
`clear, get, get, isValid, keySet, put, remove`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### SimpleCache

    public SimpleCache()

Method Detail

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`
  See Also:
    `Object.toString()`

### retrieve

    protected CacheValue retrieve(CacheKey cacheKey)

  Actually retrieves the `CacheValue` from the underlying storage.
  This method must return the previously stored value - even if it is not valid anymore.

  Specified by:
    `retrieve` in class `AbstractCache`
  Parameters:
    `cacheKey` - The `CacheKey` to be used for retrieval.
  Returns:
    The previously stored `CacheValue` or `null` if no `CacheValue` is stored at the given `cacheKey`.
  See Also:
    `AbstractCache.retrieve(org.apache.cocoon.pipeline.caching.CacheKey)`

### store

    protected void store(CacheKey cacheKey,
                         CacheValue cacheValue)

  Actually stores the given `cacheValue` at the given `cacheKey` in the underlying storage.
  This method is to replace any previously stored `CacheValue` (if any).

  Specified by:
    `store` in class `AbstractCache`
  Parameters:
    `cacheKey` - The `CacheKey` to be used for storing.
    `cacheValue` - The `CacheValue` to be stored.
  See Also:
    `AbstractCache.store(org.apache.cocoon.pipeline.caching.CacheKey, org.apache.cocoon.pipeline.caching.CacheValue)`

### doClear

    protected void doClear()

  Actually clears the underlying storage.

  Specified by:
    `doClear` in class `AbstractCache`
  See Also:
    `org.apache.cocoon.pipeline.caching.AbstractCach#doClear()`

### doRemove

    protected boolean doRemove(CacheKey cacheKey)

  Actually removes cached data from underlying storage.

  Specified by:
    `doRemove` in class `AbstractCache`
  Parameters:
    `cacheKey` - The `CacheKey` to be removed.
  See Also:
    `org.apache.cocoon.pipeline.caching.AbstractCach#doRemove(org.apache.cocoon.pipeline.caching.CacheKey)`

### retrieveKeySet

    protected Set<CacheKey> retrieveKeySet()

  Actually retrieves the `Set` for `CacheKey` from underlying storage.

  Specified by:
    `retrieveKeySet` in class `AbstractCache`
  Returns:
    The `Set` of `CacheKey` of containded data.
  See Also:
    `org.apache.cocoon.pipeline.caching.AbstractCach#retrieve()`

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