/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.capedwarf.server.api.cache;
import javax.cache.Cache;
import javax.inject.Inject;
import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
/**
* Cache interceptor.
*
* @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
*/
@Cacheable
@Interceptor
public class CacheInterceptor implements Serializable {
private static final long serialVersionUID = 1l;
private static final Logger log = Logger.getLogger(CacheInterceptor.class.getName());
/**
* The keys
*/
private static Map<Class<? extends KeyStrategy>, KeyStrategy> keys = new ConcurrentHashMap<Class<? extends KeyStrategy>, KeyStrategy>();
/**
* The cache config
*/
private transient CacheConfig cacheConfig;
/**
* The cache execption handler
*/
private transient CacheExceptionHandler exceptionHandler;
@AroundInvoke
@SuppressWarnings("unchecked")
public Object manageCache(InvocationContext ctx) throws Exception {
Class<?> clazz = ctx.getTarget().getClass();
Method m = ctx.getMethod();
Cacheable cacheable = m.getAnnotation(Cacheable.class);
if (cacheable == null)
cacheable = clazz.getAnnotation(Cacheable.class);
// sanity check
if (cacheable == null)
throw new IllegalArgumentException("Null cachable, invalid usage?");
String cacheName = cacheable.name();
Cache cache = cacheConfig.configureCache(cacheName);
CacheMode mode = cacheable.mode(); // should not be null, as we got intercepted
Class<? extends KeyStrategy> ksClass = cacheable.key();
KeyStrategy ks = keys.get(ksClass);
if (ks == null) {
try {
ks = ksClass.newInstance();
} catch (Exception e) {
log.fine("Error creating KeyStrategy: " + e);
Constructor<? extends KeyStrategy> ctor = ksClass.getConstructor(CacheConfig.class);
ks = ctor.newInstance(cacheConfig);
}
keys.put(ksClass, ks);
}
Object target = ctx.getTarget();
Object[] args = ctx.getParameters();
Serializable key = ks.createKey(target, m, args);
Object value = null;
try {
if (mode == CacheMode.READ_ONLY || mode == CacheMode.ALL)
value = cache.get(key);
if (value != null) {
Object unwraped = ks.unwrap(value, target, m, args);
if (unwraped != null) // could be invalidated
return unwraped;
}
value = ctx.proceed();
if (value != null && (mode == CacheMode.WRITE_ONLY || mode == CacheMode.ALL))
cache.put(key, ks.wrap(value, target, m, args));
else if (mode == CacheMode.REMOVE)
cache.remove(key);
else if (mode == CacheMode.EVICT)
cache.evict();
else if (mode == CacheMode.CLEAR)
cache.clear();
return value;
} catch (Throwable e) {
return exceptionHandler.handleException(cache, ctx, key, value, e);
}
}
@Inject
public void setExceptionHandler(CacheExceptionHandler exceptionHandler) {
this.exceptionHandler = exceptionHandler;
}
@Inject
public void setCacheConfig(CacheConfig cacheConfig) {
this.cacheConfig = cacheConfig;
}
}