TopLink Grid uses the standard JPA run-time configuration file persistence.xml and the JPA mapping file orm.xml. The TopLink Grid cache store and cache loader implementations are shipped in the toplink-grid.jar file. These implementations reside in the package. In this JPA on the Grid approach, TopLink Grid provides a set of cache and query configuration options that allow you to control how EclipseLink JPA uses Coherence. Applications can be scaled in a number of ways, ranging from using Coherence as a distributed shared (L2) cache up to directing JP QL queries to Coherence for parallel execution across the grid to reduce database load. TopLink Grid provides the means for scaling JPA applications using Oracle Coherence. You can build applications using JPA and transparently use the power of the data grid for improved scalability and performance. In this traditional Coherence approach, TopLink Grid provides the CacheLoader and CacheStore implementations in the package that are optimized for EclipseLink JPA. You can use the Coherence API with caches backed by TopLink Grid to access relational data with special cache loader and cache store interfaces which have been implemented for JPA. Oracle TopLink Grid is a feature used for integrating the TopLink JPA implementation, provided by EclipseLink, with Oracle Coherence. One of the additional components provided by TopLink is TopLink Grid. TopLink includes additional features beyond EclipseLink. The core technology of TopLink is provided by EclipseLink, the open-source persistence framework from the Eclipse Foundation. Oracle TopLink is a persistence framework including development tools and run-time capabilities for providing transformation, mapping, and persistence operations in Java SE and Java EE environments. It also allows you to use standard Coherence get and put methods, and have Coherence calls translated into database calls using JPA and Oracle TopLink (based on the open source EclipseLink project). The JPA implementation used in this exercise provides Object Relational Mapping (ORM) from the Java world to the database world. To persist data, there are several backing map implementations. By default, Coherence uses a memory-based backing map. To determine how data is stored within a Coherence cluster, a backing map is used. In addition to simplifying the entity persistence model, the JPA standardizes object-relational mapping. JPA defines how relational data is mapped to Java objects (persistent entities), the way that these objects are stored in a relational database so that they can be accessed at a later time, and the continued existence of an entity's state even after the application that uses it ends.
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