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org.mmbase.framework
Class CachedRenderer

java.lang.Object
  extended by org.mmbase.framework.AbstractRenderer
      extended by org.mmbase.framework.WrappedRenderer
          extended by org.mmbase.framework.CachedRenderer
All Implemented Interfaces:
Renderer
Direct Known Subclasses:
DocumentationRenderer
public class CachedRenderer
extends WrappedRenderer

This renderer caches other renderers. If you need caching for a certain block, then you define another block with this class CachedRenderer, and refer the to-be-cached block. Like so: 

  <block name="statistics_uncached"
         mimetype="text/html">
    <body>
       <class name="org.mmbase.framework.ResourceRenderer">
         <param name="resource">documentation/mmstatistics.xml</param>
         <param name="type">config</param>
         <param name="xslt">xslt/docbook2block.xslt</param>
      </class>
    </body>
  </block>

  <block name="statistics"
         classification="mmbase.documentation"
         mimetype="text/html">
    <body>
      <class name="org.mmbase.framework.CachedRenderer">
        <param name="wrapsBlock">statistics_uncached</param>
        <param name="includeRenderTime">xml-comments</param>
      </class>
    </body>
  </block>
* Caching can be based on an 'expires' property. If that is not specified, caching will happen according the HTTP specifications on the URI returned by Renderer.getUri().

Since:
MMBase-1.9.1
Version:
$Id: CachedRenderer.java 40167 2009-12-08 18:00:55Z michiel $
Author:
Michiel Meeuwissen

Nested Class Summary
 
Nested classes/interfaces inherited from interface org.mmbase.framework.Renderer
Renderer.Type
 
Field Summary
 
Fields inherited from class org.mmbase.framework.WrappedRenderer
wrapped
 
Fields inherited from class org.mmbase.framework.AbstractRenderer
type
 
Constructor Summary
CachedRenderer(Renderer.Type t, Block parent)
           
 
Method Summary
protected  File getCacheFile(Parameters blockParameters, RenderHints hints)
           
protected  File getETagFile(File file)
           
protected  File getExpiresFile(File file)
           
protected  String getKey(Parameters blockParameters)
           
protected  String readETag(File f)
           
protected  long readExpires(File f)
           
 void render(Parameters blockParameters, Writer w, RenderHints hints)
          Renders to a writer.
protected  void renderFile(File f, Writer w)
           
protected  void renderWrappedAndFile(File f, Parameters blockParameters, Writer w, RenderHints hints, Runnable ready)
          Renders the wrapped renderer, and writes the result to both a file, and to the writer.
 void setDirectory(String d)
           
 void setExpires(int e)
           
 void setIncludeRenderTime(String type)
           
 void setTimeout(int t)
          If using an HttpURLConnection, then use the given timeout.
 void setWait(int t)
          If rendering of the cached renderer takes very long, you may choose to not wait for the result.
 String toString()
           
protected  void writeETag(File f, String etag)
           
protected  void writeExpires(File f, long expires)
           
protected  void writeRenderTime(Date time, Writer w)
           
 
Methods inherited from class org.mmbase.framework.WrappedRenderer
getParameters, getUri, getWraps, setWraps, setWrapsBlock
 
Methods inherited from class org.mmbase.framework.AbstractRenderer
decorateIntro, decorateOutro, getBlock, getType, getUri
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

CachedRenderer

public CachedRenderer(Renderer.Type t,
                      Block parent)
Method Detail

setExpires

public void setExpires(int e)

setDirectory

public void setDirectory(String d)

setTimeout

public void setTimeout(int t)
If using an HttpURLConnection, then use the given timeout. Defaults to 2 seconds.

Parameters:
t - Timeout in milliseconds

setWait

public void setWait(int t)
If rendering of the cached renderer takes very long, you may choose to not wait for the result. But serve an message or the old version. The job can be joined later.

Parameters:
t - Wait-time in milliseconds

setIncludeRenderTime

public void setIncludeRenderTime(String type)

writeRenderTime

protected void writeRenderTime(Date time,
                               Writer w)
                        throws FrameworkException,
                               IOException
Throws:
FrameworkException
IOException

getKey

protected String getKey(Parameters blockParameters)

getCacheFile

protected File getCacheFile(Parameters blockParameters,
                            RenderHints hints)

getETagFile

protected File getETagFile(File file)

writeETag

protected void writeETag(File f,
                         String etag)
                  throws IOException
Throws:
IOException

readETag

protected String readETag(File f)
                   throws IOException
Throws:
IOException

getExpiresFile

protected File getExpiresFile(File file)

writeExpires

protected void writeExpires(File f,
                            long expires)
                     throws IOException
Throws:
IOException

readExpires

protected long readExpires(File f)
                    throws IOException
Throws:
IOException

renderFile

protected void renderFile(File f,
                          Writer w)
                   throws FrameworkException,
                          IOException
Throws:
FrameworkException
IOException

renderWrappedAndFile

protected void renderWrappedAndFile(File f,
                                    Parameters blockParameters,
                                    Writer w,
                                    RenderHints hints,
                                    Runnable ready)
                             throws FrameworkException,
                                    IOException
Renders the wrapped renderer, and writes the result to both a file, and to the writer.

Throws:
FrameworkException
IOException

render

public void render(Parameters blockParameters,
                   Writer w,
                   RenderHints hints)
            throws FrameworkException
Description copied from interface: Renderer
Renders to a writer. In case of e.g. a JSPView, the parameters must also contain the Http Servlet response and request, besided specific parameters for this component.

Specified by:
render in interface Renderer
Overrides:
render in class WrappedRenderer
Throws:
FrameworkException

toString

public String toString()
Overrides:
toString in class WrappedRenderer
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