The clients are Coherence cluster members, but are not responsible for storing data. Cache operations include loading objects in the cache, using cached objects, processing cached data, and performing cache maintenance. For details about application scope, see Running Multiple Applications in a Single Cluster.Īn application tier is comprised of any number of clients that perform cache operations. See Overview of the DefaultCacheServer Class in Developing Applications with Oracle Coherence. You can override the default name by providing a different name as an argument. Java -server -Xms4g -Xmx4g -cp APPLICATION_HOME\config COHERENCE_HOME\lib\coherence.jar D:\example\MyGAR.gar The default name ( MyGAR) is used as the application name, which provides a scope for the application on the cluster. The following example starts a cache server and uses the application artifacts that are packaged in the MyGar.gar file. The instructions are included as part of WebLogic server deployment, but are also applicable to a GAR being deployed with the DefaultCacheServer class. A GAR adheres to a specific directory structure and includes an application descriptor. As a convenience, you can reuse the COHERENCE_HOME \bin\cache-server script and modify it as required.Ĭoherence application artifacts can be packaged as a Grid ARchive (GAR) and deployed with the DefaultCacheServer class. If you choose to include any configuration overrides as system properties (rather than modifying an operational override file), then they can be included as -D arguments to the java command. Java -server -Xms4g -Xmx4g -cp APPLICATION_HOME\config APPLICATION_HOME\lib\m圜lasses.jar COHERENCE_HOME\lib\coherence.jar The following example starts a single cache server using the configuration files in the APPLICATION_HOME \config directory and uses the implementations classes in the APPLICATION_HOME \lib\m圜lasses library: However, the artifacts must be found on the server classpath and all configuration files must be found before the coherence.jar library if the default names are used otherwise, the default configuration files that are located in the coherence.jar library are loaded. There are no restrictions on how the application artifacts must be packaged on a data tier. The following application artifacts are often deployed with a cache server:Ĭonfiguration files such as the operational override configuration file, the cache configuration file and the POF user type configuration fileĭata grid processing implementations such as queries, entry processor, entry aggregators, and so onĬache store and loader implementations when caching objects from data sources See Starting Cache Servers in Developing Applications with Oracle Coherence. The class contains a main method and is started from the command line. See Cache Size Calculation Recommendations and Hardware Recommendations.Ĭache servers are typically started using the class. Each cache server is a Coherence cluster member and runs in its own JVM process and multiple cache server processes can be collocated on a physical server. The number of cache servers depends on the amount of data that is expected in the cache and whether the data must be backed up and survive a server failure. A Coherence application may require any number of cache servers in the data tier.
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