service.emailer.Emailer.java Source code

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Here is the source code for service.emailer.Emailer.java

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/*
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package service.emailer;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
 *
 * @author Chunsing
 */
public class Emailer {

    private static final String JNDI_CONNECTION_FACTORY = "jms/__defaultConnectionFactory";
    private static final String JNDI_QUEUE = "jms/emailQueue";

    private static <T> T lookup(Class<T> retvalClass, String jndi) {
        try {
            return retvalClass.cast(InitialContext.doLookup(jndi));
        } catch (NamingException ex) {
            throw new IllegalArgumentException("failed to lookup instance of " + retvalClass + " at " + jndi, ex);
        }
    }

    /**
     * Send email with parameters to emailQueue
     * @param area
     * @param email
     */
    public static void sendEmail(String area, List<String> email) {
        try {
            //JMS QUEUE SEND
            final ConnectionFactory connectionFactory = lookup(ConnectionFactory.class, JNDI_CONNECTION_FACTORY);
            final Queue queue = lookup(Queue.class, JNDI_QUEUE);

            Connection connection = connectionFactory.createConnection();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageProducer producer = session.createProducer(queue);
            MapMessage message = session.createMapMessage();
            message.setString("type", "warnFile");
            message.setString("area", area);
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(email);
            message.setString("emailReceivers", json);
            producer.send(message);
        } catch (JMSException ex) {
            Logger.getLogger(Emailer.class.getName()).log(Level.SEVERE, null, ex);
        } catch (JsonProcessingException ex) {
            Logger.getLogger(Emailer.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}