net.sf.ehcache.exceptionhandler
Class ExceptionHandlingDynamicCacheProxy

java.lang.Object
  net.sf.ehcache.exceptionhandler.ExceptionHandlingDynamicCacheProxy

All Implemented Interfaces:

java.lang.reflect.InvocationHandler

public final class ExceptionHandlingDynamicCacheProxy
extends java.lang.Object
implements java.lang.reflect.InvocationHandler

A dynamic proxy which provides CacheException handling.

The ehcache configuration will create and register in the CacheManager Ehcaches decorated with this dynamic proxy. See following for programmatic use.

The createProxy factory method may be used to simply create a proxy. Otherwise the calling client will need code similar to:

 (Ehcache) Proxy.newProxyInstance(ehcache.getClass().getClassLoader(), new Class[]{ Ehcache.class },
 new ExceptionHandlingDynamicCacheProxy(ehcache));

A common usage is to create a proxy and then register the proxy in CacheManager in place of the underlying cache. To do that create a proxy and then call

 cacheManager.replaceCacheWithDecoratedCache(Ehcache cache, Ehcache decoratedCache);
 

All clients accessing the cache throughcacheManager.getEhcache() will then receive proxy references.

See CacheTest for a perf test.

Version:

$Id: ExceptionHandlingDynamicCacheProxy.java 604 2008-04-25 02:20:57Z gregluck $

Author:

Greg Luck

Constructor Summary

ExceptionHandlingDynamicCacheProxy(Ehcache ehcache)
Constructor: Use with something like:

Method Summary

static Ehcache	createProxy(Ehcache ehcache) A simple factory method to hide the messiness of creating the proxy from clients.
(package private) static java.lang.String	extractKey(java.lang.String message) Extracts the key from the message, if any
java.lang.Object	invoke(java.lang.Object proxy, java.lang.reflect.Method method, java.lang.Object[] args) Processes a method invocation on a proxy instance and returns the result.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExceptionHandlingDynamicCacheProxy

public ExceptionHandlingDynamicCacheProxy(Ehcache ehcache)

Constructor: Use with something like:

 (Ehcache) Proxy.newProxyInstance(ehcache.getClass().getClassLoader(), new Class[]{ Ehcache.class },
 new ExceptionHandlingDynamicCacheProxy(ehcache));

Parameters:

ehcache - the backing ehcache

Method Detail

createProxy

public static Ehcache createProxy(Ehcache ehcache)

A simple factory method to hide the messiness of creating the proxy from clients.

Parameters:

ehcache - the target cache

Returns:

a proxied Ehcache

invoke

public java.lang.Object invoke(java.lang.Object proxy,
                               java.lang.reflect.Method method,
                               java.lang.Object[] args)
                        throws java.lang.Throwable

Processes a method invocation on a proxy instance and returns the result. This method will be invoked on an invocation handler when a method is invoked on a proxy instance that it is associated with.

Specified by:

invoke in interface java.lang.reflect.InvocationHandler

Parameters:

proxy - the proxy instance that the method was invoked on

method - the Method instance corresponding to the interface method invoked on the proxy instance. The declaring class of the Method object will be the interface that the method was declared in, which may be a superinterface of the proxy interface that the proxy class inherits the method through.

args - an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, or null if interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such as java.lang.Integer or java.lang.Boolean.

Returns:

the value to return from the method invocation on the proxy instance. If the declared return type of the interface method is a primitive type, then the value returned by this method must be an instance of the corresponding primitive wrapper class; otherwise, it must be a type assignable to the declared return type. If the value returned by this method is null and the interface method's return type is primitive, then a NullPointerException will be thrown by the method invocation on the proxy instance. If the value returned by this method is otherwise not compatible with the interface method's declared return type as described above, a ClassCastException will be thrown by the method invocation on the proxy instance.

Throws:

java.lang.Throwable - the exception to throw from the method invocation on the proxy instance. The exception's type must be assignable either to any of the exception types declared in the throws clause of the interface method or to the unchecked exception types java.lang.RuntimeException or java.lang.Error. If a checked exception is thrown by this method that is not assignable to any of the exception types declared in the throws clause of the interface method, then an UndeclaredThrowableException containing the exception that was thrown by this method will be thrown by the method invocation on the proxy instance.

See Also:

UndeclaredThrowableException

extractKey

static java.lang.String extractKey(java.lang.String message)

Extracts the key from the message, if any