/**
* 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.component.hazelcast.map;
import java.util.Collection;
import java.util.Map;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.query.SqlPredicate;
import org.apache.camel.Exchange;
import org.apache.camel.component.hazelcast.HazelcastComponentHelper;
import org.apache.camel.component.hazelcast.HazelcastConstants;
import org.apache.camel.component.hazelcast.HazelcastDefaultProducer;
public class HazelcastMapProducer extends HazelcastDefaultProducer {
private final IMap<Object, Object> cache;
public HazelcastMapProducer(HazelcastInstance hazelcastInstance, HazelcastMapEndpoint endpoint, String cacheName) {
super(endpoint);
this.cache = hazelcastInstance.getMap(cacheName);
}
public void process(Exchange exchange) throws Exception {
Map<String, Object> headers = exchange.getIn().getHeaders();
// get header parameters
Object oid = null;
String query = null;
if (headers.containsKey(HazelcastConstants.OBJECT_ID)) {
oid = headers.get(HazelcastConstants.OBJECT_ID);
}
if (headers.containsKey(HazelcastConstants.QUERY)) {
query = (String) headers.get(HazelcastConstants.QUERY);
}
final int operation = lookupOperationNumber(exchange);
switch (operation) {
case HazelcastConstants.PUT_OPERATION:
this.put(oid, exchange);
break;
case HazelcastConstants.GET_OPERATION:
this.get(oid, exchange);
break;
case HazelcastConstants.DELETE_OPERATION:
this.delete(oid);
break;
case HazelcastConstants.UPDATE_OPERATION:
this.update(oid, exchange);
break;
case HazelcastConstants.QUERY_OPERATION:
this.query(query, exchange);
break;
default:
throw new IllegalArgumentException(String.format("The value '%s' is not allowed for parameter '%s' on the MAP cache.", operation, HazelcastConstants.OPERATION));
}
// finally copy headers
HazelcastComponentHelper.copyHeaders(exchange);
}
/**
* query map with a sql like syntax (see http://www.hazelcast.com/)
*/
private void query(String query, Exchange exchange) {
Collection<Object> result = this.cache.values(new SqlPredicate(query));
exchange.getOut().setBody(result);
}
/**
* update an object in your cache (the whole object will be replaced)
*/
private void update(Object oid, Exchange exchange) {
Object body = exchange.getIn().getBody();
this.cache.lock(oid);
this.cache.replace(oid, body);
this.cache.unlock(oid);
}
/**
* remove an object from the cache
*/
private void delete(Object oid) {
this.cache.remove(oid);
}
/**
* find an object by the given id and give it back
*/
private void get(Object oid, Exchange exchange) {
exchange.getOut().setBody(this.cache.get(oid));
}
/**
* put a new object into the cache
*/
private void put(Object oid, Exchange exchange) {
Object body = exchange.getIn().getBody();
this.cache.put(oid, body);
}
}