/*
* (C) 2007-2012 Alibaba Group Holding Limited.
*
* 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.
* Authors:
* wuhua <wq163@163.com> , boyan <killme2008@gmail.com>
*/
package com.taobao.metamorphosis.example;
import static com.taobao.metamorphosis.example.Help.initMetaConfig;
import java.util.concurrent.Executor;
import com.taobao.metamorphosis.Message;
import com.taobao.metamorphosis.client.MessageSessionFactory;
import com.taobao.metamorphosis.client.MetaMessageSessionFactory;
import com.taobao.metamorphosis.client.consumer.ConsumerConfig;
import com.taobao.metamorphosis.client.consumer.MessageConsumer;
import com.taobao.metamorphosis.client.consumer.MessageListener;
/**
* ��auto ackģʽ�½�����Ϣ������
*
* @author boyan
*
*/
public class TransactionalConsumer {
public static void main(final String[] args) throws Exception {
// New session factory,ǿ�ҽ���ʹ�õ���
final MessageSessionFactory sessionFactory = new MetaMessageSessionFactory(initMetaConfig());
// subscribed topic
final String topic = "meta-test";
// consumer group
final String group = "meta-example";
// create consumer,ǿ�ҽ���ʹ�õ���
final MessageConsumer consumer = sessionFactory.createConsumer(new ConsumerConfig(group));
// subscribe topic
consumer.subscribe(topic, 1024 * 1024, new MessageListener() {
private int count = 0;
@Override
public void recieveMessages(final Message message) {
System.out.println("Receive message " + new String(message.getData()));
// set auto ack to false
message.getPartition().setAutoAck(false);
// ack once per two messages
if (++this.count % 2 == 0) {
message.getPartition().ack();
System.out.println("ack message");
}
}
@Override
public Executor getExecutor() {
// Thread pool to process messages,maybe null.
return null;
}
});
// complete subscribe
consumer.completeSubscribe();
}
}