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

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

All Implemented Interfaces:
  Cache

Direct Known Subclasses:
  SimpleCache

    public abstract class AbstractCache

extends Object
implements Cache

An abstract implementation of the `Cache` interface.
It handles the validity check for retrieving `CacheValue`s but relies on child classes for actually accessing the underlying stores.

Constructor Summary
`AbstractCache()`

Method Summary
`void` | `clear()` Removes all data coneined in this Cache
`protected abstract void` | `doClear()` Actually clears the underlying storage.
`protected abstract boolean` | `doRemove(CacheKey cacheKey)` Actually removes cached data from underlying storage.
`CacheValue` | `get(CacheKey cacheKey)` Retrieves the `CacheValue` previously stored using the given `cacheKey`. If the `cacheKey` is not stored in this `Cache` this method will return `null`. Furthermore the `Cache` will check if the stored `CacheValue` is still valid (using the `CacheValue.isValid(CacheKey)` method).
`CacheValue` | `get(CacheKey cacheKey, boolean includeInvalid)` Retrieves the `CacheValue` previously stored using the given `cacheKey`. If the `cacheKey` is not stored in this `Cache` this method will return `null`. This method will omit the check for validity if `includeInvalid` is `true` (i.e.
`protected boolean` | `isValid(CacheKey cacheKey, CacheValue cacheValue)` Determines if the given `cacheValue` is valid according to the given `cacheKey`. This method returns `true` if and only if the given `cacheValue` is not `null` and calling `CacheValue.isValid(CacheKey)` with the given `cacheKey` returns `true`.
`Set<CacheKey>` | `keySet()` Returns `Set` of `CacheKey` contained in this Cache
`void` | `put(CacheKey cacheKey, CacheValue cacheValue)` Stores the given `cacheValue` at the given `cacheKey`. If this cache already contains the given `cacheKey` it will be replaced. If two `CacheKey`s represent the same data is ultimately depending on the implementation, but usually relies on the `equals` an/or `hashcode` methods.
`boolean` | `remove(CacheKey cacheKey)` Removes that CacheKey from this Cache.
`protected abstract 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 abstract Set<CacheKey>` | `retrieveKeySet()` Actually retrieves the `Set` for `CacheKey` from underlying storage.
`protected abstract 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).

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

Constructor Detail

### AbstractCache

    public AbstractCache()

Method Detail

### get

    public final CacheValue get(CacheKey cacheKey)

  Retrieves the `CacheValue` previously stored using the given `cacheKey`.
  If the `cacheKey` is not stored in this `Cache` this method will return `null`.
  Furthermore the `Cache` will check if the stored `CacheValue` is still valid (using the `CacheValue.isValid(CacheKey)` method). If the `CacheValue` is considered to be invalid this method will return `null` as well (indicating that no valid `CacheValue` is available).
  To retrieve CacheValues even if they are invalid, use the `Cache.get(CacheKey, boolean)` method.

  Specified by:
    `get` in interface `Cache`
  Parameters:
    `cacheKey` - The `CacheKey` defining which `CacheValue` to retrieve.
  Returns:
    The previously stored `CacheValue` or `null` if no or no valid `CacheValue` is stored at the given `cacheValue`.
  See Also:
    `Cache.get(org.apache.cocoon.pipeline.caching.CacheKey)`

### get

    public final CacheValue get(CacheKey cacheKey,
                                boolean includeInvalid)

  Retrieves the `CacheValue` previously stored using the given `cacheKey`.
  If the `cacheKey` is not stored in this `Cache` this method will return `null`.
  This method will omit the check for validity if `includeInvalid` is `true` (i.e. the returned CacheValue might be invalid in this case).

  Specified by:
    `get` in interface `Cache`
  Parameters:
    `cacheKey` - The `CacheKey` defining which `CacheValue` to retrieve.
    `includeInvalid` - Defines whether invalid `CacheValue` should be returned or not. Using `true` will also return invalid `CacheValue`. Using `false` will yield the same results as `Cache.get(CacheKey)`.
  Returns:
    The previously stored `CacheValue` or `null` if and only if no `CacheValue` is stored at the given `cacheValue`.
  See Also:
    `Cache.get(org.apache.cocoon.pipeline.caching.CacheKey, boolean)`

### put

    public final void put(CacheKey cacheKey,
                          CacheValue cacheValue)

  Stores the given `cacheValue` at the given `cacheKey`.
  If this cache already contains the given `cacheKey` it will be replaced.
  If two `CacheKey`s represent the same data is ultimately depending on the implementation, but usually relies on the `equals` an/or `hashcode` methods.

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

### clear

    public void clear()

  Removes all data coneined in this Cache

  Specified by:
    `clear` in interface `Cache`
  See Also:
    `Cache.clear()`

### remove

    public boolean remove(CacheKey cacheKey)

  Removes that CacheKey from this Cache.

  Specified by:
    `remove` in interface `Cache`
  See Also:
    `Cache.remove(org.apache.cocoon.pipeline.caching.CacheKey)`

### keySet

    public Set<CacheKey> keySet()

  Returns `Set` of `CacheKey` contained in this Cache

  Specified by:
    `keySet` in interface `Cache`
  Returns:
    a set CacheKey contained in this Cache
  See Also:
    `Cache.keySet()`

### isValid

    protected boolean isValid(CacheKey cacheKey,
                              CacheValue cacheValue)

  Determines if the given `cacheValue` is valid according to the given `cacheKey`.
  This method returns `true` if and only if the given `cacheValue` is not `null` and calling `CacheValue.isValid(CacheKey)` with the given `cacheKey` returns `true`.

  Parameters:
    `cacheKey` - The `CacheKey` to be used for checking the `cacheValue`'s validity.
    `cacheValue` - The `CacheValue` to check for validity.
  Returns:
    `true` if the given `cacheValue` is not `null` and valid for the given `cacheKey`.

### retrieve

    protected abstract 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.

  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`.

### store

    protected abstract 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).

  Parameters:
    `cacheKey` - The `CacheKey` to be used for storing.
    `cacheValue` - The `CacheValue` to be stored.

### doClear

    protected abstract void doClear()

  Actually clears the underlying storage.

### doRemove

    protected abstract boolean doRemove(CacheKey cacheKey)

  Actually removes cached data from underlying storage.

  Parameters:
    `cacheKey` - The `CacheKey` to be removed.

### retrieveKeySet

    protected abstract Set<CacheKey> retrieveKeySet()

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

  Returns:
    The `Set` of `CacheKey` of containded data.

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