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## org.apache.cocoon.pipeline
Class CachingPipeline<T extends PipelineComponent>

    java.lang.Object
      org.apache.cocoon.pipeline.AbstractPipeline<T>
          org.apache.cocoon.pipeline.CachingPipeline<T>

All Implemented Interfaces:
  Pipeline<T>

Direct Known Subclasses:
  AsyncCachePipeline

    public class CachingPipeline<T extends PipelineComponent>

extends AbstractPipeline<T>

A `Pipeline` implementation that returns a cached result if, and only if all its components support caching. A `PipelineComponent` is cacheable if it implements the interface `CachingPipelineComponent`.

Field Summary
`protected Cache` | `cache`
`protected CacheKey` | `cacheKey`
`protected CachingOutputStream` | `cachingOutputStream`

Constructor Summary
`CachingPipeline()`

Method Summary
`CacheKey` | `constructCacheKey()`
`void` | `execute()` After the pipeline has been setup (`Pipeline.setup(OutputStream, Map)`, this method can be invoked in order to produce the result.
`protected CacheValue` | `getCachedValue(CacheKey cacheKey)`
`CacheKey` | `getCacheKey()`
`String` | `getExpires()`
`long` | `getLastModified()` Get the time of the last modification.
`protected boolean` | `isCacheKeyValid(CacheValue cachedValue)`
`void` | `setCache(Cache cache)`
`protected void` | `setCachedValue(CacheKey cacheKey, CacheValue cacheValue)`
`void` | `setConfiguration(Map<String,? extends Object> parameters)` Pass pipeline specific configuration parameters to the pipeline component in a generic way.
`void` | `setExpires(String expires)`
`void` | `setExpiresCacheKey(Serializable expiresCacheKey)`
`void` | `setup(OutputStream outputStream, Map<String,Object> parameters)` The same as `Pipeline.setup(OutputStream)` but also allows passing parameters to the pipeline components.

Methods inherited from class org.apache.cocoon.pipeline.AbstractPipeline
`addComponent, getComponents, getContentType, getFinisher, invokeStarter, setup, setupComponents, toString`

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

Field Detail

### cache

    protected Cache cache

### cacheKey

    protected CacheKey cacheKey

### cachingOutputStream

    protected CachingOutputStream cachingOutputStream

Constructor Detail

### CachingPipeline

    public CachingPipeline()

Method Detail

### constructCacheKey

    public CacheKey constructCacheKey()

### execute

    public void execute()
                 throws Exception

  Description copied from class: `AbstractPipeline`
  After the pipeline has been setup (`Pipeline.setup(OutputStream, Map)`, this method can be invoked in order to produce the result.

  Specified by:
    `execute` in interface `Pipeline<T extends PipelineComponent>`
  Overrides:
    `execute` in class `AbstractPipeline<T extends PipelineComponent>`
  Throws:
    `Exception` - Any problem that might occur while processing the pipeline.
  See Also:
    `Pipeline.execute()`

### getCacheKey

    public CacheKey getCacheKey()

### getExpires

    public String getExpires()

### getLastModified

    public long getLastModified()

  Description copied from interface: `Pipeline`
  Get the time of the last modification.

  Specified by:
    `getLastModified` in interface `Pipeline<T extends PipelineComponent>`
  Overrides:
    `getLastModified` in class `AbstractPipeline<T extends PipelineComponent>`
  Returns:
    The last modification date

### setCache

    public void setCache(Cache cache)

### setConfiguration

    public void setConfiguration(Map<String,? extends Object> parameters)

  Pass pipeline specific configuration parameters to the pipeline component in a generic way. This is useful in environments that automatically assemble pipelines with their components and can't use the pipeline's constructors or setters.

  Specified by:
    `setConfiguration` in interface `Pipeline<T extends PipelineComponent>`
  Overrides:
    `setConfiguration` in class `AbstractPipeline<T extends PipelineComponent>`
  See Also:
    `AbstractPipeline.setConfiguration(java.util.Map)`

### setExpires

    public void setExpires(String expires)

### setExpiresCacheKey

    public void setExpiresCacheKey(Serializable expiresCacheKey)

### setup

    public void setup(OutputStream outputStream,
                      Map<String,Object> parameters)

  Description copied from class: `AbstractPipeline`
  The same as `Pipeline.setup(OutputStream)` but also allows passing parameters to the pipeline components.

  Specified by:
    `setup` in interface `Pipeline<T extends PipelineComponent>`
  Overrides:
    `setup` in class `AbstractPipeline<T extends PipelineComponent>`
  Parameters:
    `outputStream` - An `OutputStream` where the pipeline execution result is written.
    `parameters` - A `Map` of parameters that are available to all `PipelineComponent`s.
  See Also:
    `Pipeline.setup(java.io.OutputStream, java.util.Map)`

### getCachedValue

    protected CacheValue getCachedValue(CacheKey cacheKey)

### isCacheKeyValid

    protected boolean isCacheKeyValid(CacheValue cachedValue)

### setCachedValue

    protected void setCachedValue(CacheKey cacheKey,
                                  CacheValue cacheValue)

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