/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.processor.cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Processor;
import org.apache.camel.Service;
import org.apache.camel.builder.ExpressionBuilder;
import org.apache.camel.component.cache.CacheConstants;
import org.apache.camel.component.cache.DefaultCacheManagerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CacheBasedMessageBodyReplacer extends CacheValidate implements Processor, Service {
private static final Logger LOG = LoggerFactory.getLogger(CacheBasedMessageBodyReplacer.class);
private CacheManager cacheManager;
private String cacheName;
private Expression key;
public CacheBasedMessageBodyReplacer(String cacheName, String key) {
this(cacheName, ExpressionBuilder.constantExpression(key));
}
public CacheBasedMessageBodyReplacer(String cacheName, Expression key) {
if (cacheName.contains("cache://")) {
this.setCacheName(cacheName.replace("cache://", ""));
} else {
this.setCacheName(cacheName);
}
this.setKey(key);
}
public void process(Exchange exchange) throws Exception {
String cacheKey = key.evaluate(exchange, String.class);
if (isValid(cacheManager, cacheName, cacheKey)) {
Ehcache cache = cacheManager.getCache(cacheName);
LOG.debug("Replacing Message Body from CacheName {} for key {}", cacheName, cacheKey);
exchange.getIn().setHeader(CacheConstants.CACHE_KEY, cacheKey);
exchange.getIn().setBody(cache.get(cacheKey).getObjectValue());
}
}
public String getCacheName() {
return cacheName;
}
public void setCacheName(String cacheName) {
this.cacheName = cacheName;
}
public Expression getKey() {
return key;
}
public void setKey(String key) {
this.key = ExpressionBuilder.constantExpression(key);
}
public void setKey(Expression key) {
this.key = key;
}
@Override
public void start() throws Exception {
// Cache the buffer to the specified Cache against the specified key
if (cacheManager == null) {
cacheManager = new DefaultCacheManagerFactory().getInstance();
}
}
@Override
public void stop() throws Exception {
// noop
}
}