Package javax.persistence

Interface Cache

public interface Cache
Interface used to interact with the second-level cache. If a cache is not in use, the methods of this interface have no effect, except for contains, which returns false.
Since:
Java Persistence 2.0

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    contains(Class cls, Object primaryKey)
    Whether the cache contains data for the given entity.
    void
    evict(Class cls)
    Remove the data for entities of the specified class (and its subclasses) from the cache.
    void
    evict(Class cls, Object primaryKey)
    Remove the data for the given entity from the cache.
    void
    evictAll()
    Clear the cache.
    <T> T
    unwrap(Class<T> cls)
    Return an object of the specified type to allow access to the provider-specific API.

  • Method Details

    • contains

      boolean contains(Class cls, Object primaryKey)
      Whether the cache contains data for the given entity.
      Parameters:
      cls - entity class
      primaryKey - primary key
      Returns:
      boolean indicating whether the entity is in the cache

    • evict

      void evict(Class cls, Object primaryKey)
      Remove the data for the given entity from the cache.
      Parameters:
      cls - entity class
      primaryKey - primary key

    • evict

      void evict(Class cls)
      Remove the data for entities of the specified class (and its subclasses) from the cache.
      Parameters:
      cls - entity class

    • evictAll

      void evictAll()
      Clear the cache.

    • unwrap

      <T> T unwrap(Class<T> cls)
      Return an object of the specified type to allow access to the provider-specific API. If the provider's Cache implementation does not support the specified class, the PersistenceException is thrown.
      Parameters:
      cls - the class of the object to be returned. This is normally either the underlying Cache implementation class or an interface that it implements.
      Returns:
      an instance of the specified class
      Throws:
      PersistenceException - if the provider does not support the call
      Since:
      Java Persistence 2.1