Caching the output of servlets, commands, and JavaServer Pages
(JSP) improves application performance. WebSphere® Application Server consolidates
several caching activities including servlets, Web services, and WebSphere commands
into one service called the dynamic cache. These caching activities
work together to improve application performance, and share many configuration
parameters that are set in the dynamic cache service of an application server.
You can use the dynamic cache to improve the performance of servlet and JSP
files by serving requests from an in-memory cache. Cache entries contain servlet
output, the results of a servlet after it runs, and metadata.
About this task
The dynamic cache service works within an application server Java virtual
machine (JVM), intercepting calls to cacheable objects. For example, it intercepts
calls through a servlet service method or a command execute method, and either
stores the output of the object to the cache or serves the content of the
object from the dynamic cache.
Procedure
- The dynamic cache service is enabled by default. You
can configure the default cache instance in the administrative console. Refer
to the Using the dynamic cache service topic for more information.
- Configure the type of caching that you are using:
- Configuring servlet caching.
- Configuring portlet fragment caching.
- Configuring Edge Side Include caching.
- Configuring command caching.
- Example: Caching Web services.
- Configuring the JAX-RPC Web services client cache.
- Monitor the results of your configuration using the dynamic cache
monitor. Refer to the Displaying cache information topic for more
information about the dynamic cache monitor.
What to do next
To use the DistributedMap and DistributedObjectCache interfaces for
the dynamic cache, refer to the Using the DistributedMap and DistributedObjectCache
interfaces for the dynamic cache topic.