/**
* Copyright (c) 2014, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.synapse.message.store.impl.jdbc;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.MessageContext;
import org.apache.synapse.SynapseException;
import org.apache.synapse.message.MessageConsumer;
/**
* JDBC Store Consumer
*/
public class JDBCConsumer implements MessageConsumer {
/**
* Logger for the class
*/
private static final Log logger = LogFactory.getLog(JDBCConsumer.class.getName());
/**
* Store for the consumer
*/
private JDBCMessageStore store;
/**
* Id of the consumer
*/
private String consumerId;
/**
* Store current message index processing
*/
private String currentMessageId;
/**
* Initialize consumer
*
* @param store - JDBC message store
*/
public JDBCConsumer(JDBCMessageStore store) {
this.store = store;
}
/**
* Select and return the first element in current table
*
* @return - Select and return the first element from the table
*/
@Override
public MessageContext receive() {
// Message will get peeked from the table
MessageContext msg = null;
try {
msg = store.peek();
if (msg != null) {
currentMessageId = msg.getMessageID();
}
} catch (SynapseException e) {
logger.error("Can't receive message ", e);
}
return msg;
}
/**
* Ack on success message sending by processor
*
* @return Success of removing
*/
@Override
public boolean ack() {
// Message will be removed at this point
MessageContext msg = store.remove(currentMessageId);
if (msg != null) {
store.dequeued();
return true;
} else {
return false;
}
}
/**
* Cleanup the consumer
*
* @return Success of cleaning
*/
@Override
public boolean cleanup() {
currentMessageId = null;
return true;
}
/**
* Check JDBC consumer is alive
*
* @return consumer status
*/
public boolean isAlive() {
return true; //TODO need to implement proper way to check availability
}
/**
* Set consumer id
*
* @param id ID
*/
@Override
public void setId(int id) {
consumerId = "[" + store.getName() + "-C-" + id + "]";
}
/**
* Get consumer id
*
* @return consumerId - Consumer identifier
*/
@Override
public String getId() {
if (consumerId == null) {
return "[unknown-consumer]";
}
return consumerId;
}
}