Annotation Type CacheResult


  • @Target({METHOD,TYPE})
    @Retention(RUNTIME)
    public @interface CacheResult
    When a method annotated with CacheResult is invoked a GeneratedCacheKey will be generated and Cache.get(Object) is called before the annotated method actually executes. If a value is found in the cache it is returned and the annotated method is never actually executed. If no value is found the annotated method is invoked and the returned value is stored in the cache with the generated key.

    Exceptions are not cached by default. Caching of exceptions can be enabled by specifying an exceptionCacheName(). If an exception cache is specified it is checked before invoking the annotated method and if a cached exception is found it is re-thrown.

    The cachedExceptions() and nonCachedExceptions() properties can be used to control the exceptions are cached and those that are not.

    To always invoke the annotated method and still cache the result set skipGet() to true. This will disable the pre-invocation Cache.get(Object) call. If exceptionCacheName() is specified the pre-invocation exception check is also disabled. This feature is useful for methods that create or update objects to be cached.

    Example of caching the Domain object with a key generated from the String and int parameters.

    With no cacheName() specified a cache name of "my.app.DomainDao.getDomain(java.lang.String,int)" will be generated.

    
     package my.app;
     
     public class DomainDao {
       @CacheResult
       public Domain getDomain(String domainId, int index) {
         ...
       }
     }
     

    Example using the GeneratedCacheKey annotation so that only the domainId parameter is used in key generation:

    
     package my.app;
     
     public class DomainDao {
       @CacheResult
       public Domain getDomain(@CacheKey String domainId, Monitor mon) {
         ...
       }
     }
     

    If exception caching is enabled via specification of exceptionCacheName() the following rules are used to determine if a thrown exception is cached:

    1. If cachedExceptions() and nonCachedExceptions() are both empty then all exceptions are cached
    2. If cachedExceptions() is specified and nonCachedExceptions() is not specified then only exceptions that pass an instanceof check against the cachedExceptions list are cached
    3. If nonCachedExceptions() is specified and cachedExceptions() is not specified then all exceptions that do not pass an instanceof check against the nonCachedExceptions list are cached
    4. If cachedExceptions() and nonCachedExceptions() are both specified then exceptions that pass an instanceof check against the cachedExceptions list but do not pass an instanceof check against the nonCachedExceptions list are cached
    Since:
    1.0
    Author:
    Eric Dalquist, Rick Hightower
    See Also:
    CacheKey
    • Element Detail

      • cacheName

        String cacheName

        The name of the cache.

        If not specified defaults first to CacheDefaults.cacheName() and if that is not set it defaults to: package.name.ClassName.methodName(package.ParameterType,package.ParameterType)
        Default:
        ""
      • skipGet

        boolean skipGet
        If set to true the pre-invocation Cache.get(Object) is skipped and the annotated method is always executed with the returned value being cached as normal. This is useful for create or update methods that should always be executed and have their returned value placed in the cache.

        If true and an exceptionCacheName() is specified the pre-invocation check for a thrown exception is also skipped. If an exception is thrown during invocation it will be cached following the standard exception caching rules.

        Defaults to false.

        See Also:
        CachePut
        Default:
        false
      • exceptionCacheName

        String exceptionCacheName
        The name of the cache to cache exceptions.

        If not specified no exception caching is done.

        Default:
        ""
      • cachedExceptions

        Class<? extends Throwable>[] cachedExceptions
        Defines zero (0) or more exception classes, that must be a subclass of Throwable, indicating the exception types that must be cached. Only consulted if exceptionCacheName() is specified.
        Default:
        {}
      • nonCachedExceptions

        Class<? extends Throwable>[] nonCachedExceptions
        Defines zero (0) or more exception Classes, that must be a subclass of Throwable, indicating the exception types that must not be cached. Only consulted if exceptionCacheName() is specified.
        Default:
        {}