org.apache.flink.streaming.connectors.jms.JmsTopicSink.java Source code

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Here is the source code for org.apache.flink.streaming.connectors.jms.JmsTopicSink.java

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/*
 * Copyright 2016 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.apache.flink.streaming.connectors.jms;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Session;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
import javax.jms.TopicPublisher;
import javax.jms.TopicSession;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.jms.UncategorizedJmsException;
import org.springframework.jms.support.JmsUtils;
import org.springframework.util.Assert;

public abstract class JmsTopicSink<T> extends RichSinkFunction<T> implements InitializingBean {
    private static final long serialVersionUID = 42L;

    private static Logger logger = LoggerFactory.getLogger(JmsTopicSink.class);

    private Topic destination;
    private TopicConnectionFactory connectionFactory;

    private TopicConnection connection;
    private TopicSession session;
    private TopicPublisher producer;

    // --------------------------------------------------------------------------

    public JmsTopicSink() {

    }

    public JmsTopicSink(final TopicConnectionFactory connectionFactory, final Topic destination) {
        Assert.notNull(connectionFactory, "QueueConnectionFactory must not be null");
        Assert.notNull(destination, "Queue must not be null");
        this.connectionFactory = connectionFactory;
        this.destination = destination;
    }

    @Override
    public void open(final Configuration parameters) throws Exception {
        super.open(parameters);
        final String username = parameters.getString("jms_username", null);
        final String password = parameters.getString("jms_password", null);
        connection = connectionFactory.createTopicConnection(username, password);
        final String clientId = parameters.getString("jms_client_id", null);
        if (clientId != null)
            connection.setClientID(clientId);
        session = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
        producer = session.createPublisher(destination);
        connection.start();
    }

    @Override
    public void invoke(final T object) throws Exception {
        try {
            producer.publish(destination, convert(object, session), Message.DEFAULT_DELIVERY_MODE,
                    Message.DEFAULT_PRIORITY, Message.DEFAULT_TIME_TO_LIVE);
        } catch (JMSException e) {
            logger.error("Error sending message to [{}]: {}", destination.getTopicName(), e.getLocalizedMessage(),
                    e);
            throw new UncategorizedJmsException(e);
        }
    }

    protected abstract Message convert(final T object, final Session session) throws Exception;

    @Override
    public void close() throws Exception {
        super.close();
        JmsUtils.closeMessageProducer(producer);
        JmsUtils.closeSession(session);
        JmsUtils.closeConnection(connection, true);
    }

    public void setDestination(final Topic destination) {
        this.destination = destination;
    }

    public void setConnectionFactory(final TopicConnectionFactory connectionFactory) {
        this.connectionFactory = connectionFactory;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Assert.notNull(destination, "Destination topic must not be null");
        Assert.notNull(connectionFactory, "TopicConnectionFactory must not be null");
    }
}