/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cache.jcache;
import java.util.concurrent.Callable;
import javax.cache.processor.EntryProcessor;
import javax.cache.processor.EntryProcessorException;
import javax.cache.processor.MutableEntry;
import org.springframework.cache.support.AbstractValueAdaptingCache;
import org.springframework.util.Assert;
/**
* {@link org.springframework.cache.Cache} implementation on top of a
* {@link javax.cache.Cache} instance.
*
* <p>Note: This class has been updated for JCache 1.0, as of Spring 4.0.
*
* @author Juergen Hoeller
* @author Stephane Nicoll
* @since 3.2
*/
public class JCacheCache extends AbstractValueAdaptingCache {
private final javax.cache.Cache<Object, Object> cache;
/**
* Create an {@link org.springframework.cache.jcache.JCacheCache} instance.
* @param jcache backing JCache Cache instance
*/
public JCacheCache(javax.cache.Cache<Object, Object> jcache) {
this(jcache, true);
}
/**
* Create an {@link org.springframework.cache.jcache.JCacheCache} instance.
* @param jcache backing JCache Cache instance
* @param allowNullValues whether to accept and convert null values for this cache
*/
public JCacheCache(javax.cache.Cache<Object, Object> jcache, boolean allowNullValues) {
super(allowNullValues);
Assert.notNull(jcache, "Cache must not be null");
this.cache = jcache;
}
@Override
public final String getName() {
return this.cache.getName();
}
@Override
public final javax.cache.Cache<Object, Object> getNativeCache() {
return this.cache;
}
@Override
protected Object lookup(Object key) {
return this.cache.get(key);
}
@Override
public <T> T get(Object key, Callable<T> valueLoader) {
try {
return this.cache.invoke(key, new ValueLoaderEntryProcessor<T>(), valueLoader);
}
catch (EntryProcessorException ex) {
throw new ValueRetrievalException(key, valueLoader, ex.getCause());
}
}
@Override
public void put(Object key, Object value) {
this.cache.put(key, toStoreValue(value));
}
@Override
public ValueWrapper putIfAbsent(Object key, Object value) {
boolean set = this.cache.putIfAbsent(key, toStoreValue(value));
return (set ? null : get(key));
}
@Override
public void evict(Object key) {
this.cache.remove(key);
}
@Override
public void clear() {
this.cache.removeAll();
}
private class ValueLoaderEntryProcessor<T> implements EntryProcessor<Object, Object, T> {
@SuppressWarnings("unchecked")
@Override
public T process(MutableEntry<Object, Object> entry, Object... arguments)
throws EntryProcessorException {
Callable<T> valueLoader = (Callable<T>) arguments[0];
if (entry.exists()) {
return (T) fromStoreValue(entry.getValue());
}
else {
T value;
try {
value = valueLoader.call();
}
catch (Exception ex) {
throw new EntryProcessorException("Value loader '" + valueLoader + "' failed " +
"to compute value for key '" + entry.getKey() + "'", ex);
}
entry.setValue(toStoreValue(value));
return value;
}
}
}
}