com.arsdigita.caching
Class CacheServlet
java.lang.Object
javax.servlet.GenericServlet
javax.servlet.http.HttpServlet
com.arsdigita.caching.CacheServlet
- All Implemented Interfaces:
- Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig
- public class CacheServlet
- extends javax.servlet.http.HttpServlet
A simple servlet which accepts the cache notifications issued by other
webserver to implement coherent caching. Since there can be any
number of webservers attached to the same database instance, we must make
sure that caches among different webservers contain either the same,
consistent value for a particular cache entry, or no value at all.
Whenever a CacheTable.put(String,Object)
is invoked, a HTTP
request is sent to all the other JVMs running this service, (except the
current server of course).
The HTTP notification for newly added cache entry carries the hashcode
of the new entry, so that the peer caches can decide whether the entry they
already have (if at all) is outdated or not. For
CacheTable.remove(String)
invocations, no hash code is produced, and
peer caches will remove this item unconditionally.
- Version:
- $Revision: #18 $ $DateTime: 2004/04/07 16:07:11 $
- Author:
- Matthew Booth, Sebastian Skracic
- See Also:
- Serialized Form
Method Summary |
protected void |
doGet(javax.servlet.http.HttpServletRequest req,
javax.servlet.http.HttpServletResponse res)
This is executed when foreign server asked us to drop an entry
from our cache. |
Methods inherited from class javax.servlet.http.HttpServlet |
doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service |
Methods inherited from class javax.servlet.GenericServlet |
destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
CacheServlet
public CacheServlet()
doGet
protected void doGet(javax.servlet.http.HttpServletRequest req,
javax.servlet.http.HttpServletResponse res)
- This is executed when foreign server asked us to drop an entry
from our cache. Make sure that we don't end up in recursion.
Copyright (c) 2004 Red Hat, Inc. Corporation. All Rights Reserved. Generated at July 20 2004:2337 UTC