The caching service does not impose a structure on objects being cached. To facilitate sharing of cached objects, all objects within the cache are accessed by name. The Java Object Cache can manage any Java object. That is, objects are cached within the process memory space, and the Java Object Cache is a single service that is shared by all threads running in the process, in contrast to a service that runs in another process. The Java Object Cache is an in-process, process-wide caching service for general application use. The process could be a servlet application that generates HTML pages, or any other Java application. The cache delivers information to a user process. Alternatively, they can be reused outside HTTP, such as in outputting cached XML objects through Simple Mail Transfer Protocol (SMTP), Java Message Service (JMS), Advanced Queueing (AQ), or Simple Object Access Protocol (SOAP).įigure 9-1 shows the basic architecture for the Java Object Cache. These objects can be cached conveniently in association with HTTP semantics. The cached objects can be HTML or XML text fragments, XML DOM objects, or Java serializable objects. Each block can produce its own resulting cache object. ![]() By default, the Web Object Cache uses the Java Object Cache as its repository.Ī custom tag library or API enables you to define page fragment boundaries and to capture, store, reuse, process, and manage the intermediate and partial execution results of JSP pages and servlets as cached objects. The Web Object Cache is generally used as a complement to the Web cache. Using the Web Object Cache, applications can cache programmatically, using application programming interface (API) calls (for servlets) or custom tag libraries (for JSPs). The Web Object Cache is a hybrid cache, both Web-based and object-based. It is an application-level cache, embedded and maintained within a Java Web application. The Web Object Cache is a Web-application-level caching facility. ![]() The Java Object Cache automatically loads and updates objects as specified by the Java application. Cached Java objects can contain generated pages or can provide support objects within the program to assist in creating new content. ![]() The Java Object Cache provides caching for expensive or frequently used Java objects when the application servers use a Java program to supply their content. In addition, it offers relatively limited postprocessing abilities on cached data. Given that it exists as a flat content-based cache outside the application, it cannot cache objects (such as Java objects or XML DOM-Document Object Model-objects) in a structured format. It is a pure, content-based cache, capable of caching static data (such as HTML, GIF, or JPEG files) or dynamic data (such as servlet or JSP results). The Web Cache is an HTTP-level cache, maintained outside the application, providing fast cache operations. If the requested content has changed, the Web Cache retrieves the new content from the application servers. The Web Cache, in turn, acts as a virtual server to the application servers. When browsers access the Web site, they send HTTP requests to the Web Cache. ![]() The Web Cache sits in front of the application servers (Web servers), caching their content and providing that content to Web browsers that request it. The Oracle Application Server 10 g cache architecture includes the following cache components: The Java Object Cache retrieves content faster and greatly reduces the load on application servers. The Java Object Cache improves the performance, scalability, and availability of Web sites running on Oracle Application Server 10 g.īy storing frequently accessed or expensive-to-create objects in memory or on disk, the Java Object Cache eliminates the need to repeatedly create and load information within a Java program. Oracle Application Server 10 g offers the Java Object Cache to help e-businesses manage Web site performance issues for dynamically generated content.
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