/*
 * � 2001-2009, Progress Software Corporation and/or its subsidiaries or affiliates.  All rights reserved.
 *
 * 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.
 
Sample Application

Writing a Basic JMS Application with Point-to-Point Queues,
using:
    - Send and Receive
    - Transacted Sessions
    - Multiple Sessions

This sample starts up with a username, and the queues you are
sending on, and receiving on.

Continue writing lines and pressing enter to buffer messages until a
specific key word is used to confirm the messages or to completely
forget them.

Messages are buffered and sent when a specific string is seen ("COMMIT").
Messages buffered can be discarded by entering a specified string ("CANCEL").

Usage:
  java TransactedTalk -b <broker:port> -u <username> -p <password> -qs <queue> -qr <queue>
      -b broker:port points to your message broker
                Default: tcp://localhost:61616
      -u username    must be unique (but is not checked)
      -p password    password for user (not checked)
      -qr queue      name of queue to receive
      -qs queue      name of queue to send

You must specify either a queue for sending or receiving (or both).

Suggested demonstration:
  - In separate console windows with the environment set,
    start instances of the application under unique user names.
    For example:
       java TransactedTalk -u OPERATIONS -qr  Q1 -qs  Q2
       java TransactedTalk -u FACILITIES -qr  Q2 -qs  Q1
  - Type some text and then press Enter.
  - Repeat to create a batch of messages.
  - Send the batched messages by entering the text "COMMIT"
  - Discard the batched messages by entering the text "CANCEL"
  - Stop a session by pressing CTRL+C in its console window.

*/

import org.apache.activemq.*;

public class TransactedTalk
    implements javax.jms.MessageListener
{
    private static final String DEFAULT_BROKER_NAME = "tcp://localhost:61616";
    private static final String DEFAULT_PASSWORD = "password";
    private static final int    MESSAGE_LIFESPAN = 1800000;  // milliseconds (30 minutes)

    private javax.jms.Connection connect = null;
    private javax.jms.Session sendSession = null;
    private javax.jms.Session receiveSession = null;
    private javax.jms.MessageProducer sender = null;




    /** Create JMS client for sending and receiving messages. */
    private void talker( String broker, String username, String password, String rQueue, String sQueue)
    {
        // Create a connection.
        try
        {
            javax.jms.ConnectionFactory factory;
            factory = new ActiveMQConnectionFactory(username, password, broker);
            connect = factory.createConnection (username, password);
            // We want to be able up commit/rollback messages sent,
            // but not affect messages received.  Therefore, we need two sessions.
            sendSession = connect.createSession(true,javax.jms.Session.AUTO_ACKNOWLEDGE);
            receiveSession = connect.createSession(false,javax.jms.Session.AUTO_ACKNOWLEDGE);
        }
        catch (javax.jms.JMSException jmse)
        {
            System.err.println("error: Cannot connect to Broker - " + broker);
            jmse.printStackTrace();
            System.exit(1);
        }

        // Create Sender and Receiver 'Talk' queues
        try
        {
            if (sQueue != null)
            {
                javax.jms.Queue sendQueue = sendSession.createQueue (sQueue);
                sender = sendSession.createProducer(sendQueue);
            }
            if (rQueue != null)
            {
                javax.jms.Queue receiveQueue = receiveSession.createQueue (rQueue);
                javax.jms.MessageConsumer qReceiver = receiveSession.createConsumer(receiveQueue);
                qReceiver.setMessageListener(this);
                // Now that 'receive' setup is complete, start the Connection
                connect.start();
            }
        }
        catch (javax.jms.JMSException jmse)
        {
            jmse.printStackTrace();
            exit();
        }

        try
        {
            if (rQueue != null)
               System.out.println ("");
            else
               System.out.println ("\nNo receiving queue specified.\n");

            // Read all standard input and send it as a message.
            java.io.BufferedReader stdin =
                new java.io.BufferedReader( new java.io.InputStreamReader( System.in ) );

            if (sQueue != null){
                    System.out.println ("TransactedTalk application:");
	                System.out.println ("===========================" );
                    System.out.println ("The application user " + username + " connects to the broker at " + DEFAULT_BROKER_NAME + ".");
					System.out.println ("The application will stage messages to " + sQueue + " until you either commit them or roll them back.");
				    System.out.println ("The application receives messages on " + rQueue + " to consume any committed messages sent there.\n");
                    System.out.println ("1. Enter text to send and then press Enter to stage the message.");
                    System.out.println ("2. Add a few messages to the transaction batch.");
                    System.out.println ("3. Then, either:");
                    System.out.println ("     o Enter the text 'COMMIT', and press Enter to send all the staged messages.");
                    System.out.println ("     o Enter the text 'CANCEL', and press Enter to drop the staged messages waiting to be sent.");
            }
            else
                System.out.println ("\nPress CTRL-C to exit.\n");

            while ( true )
            {
                String s = stdin.readLine();

                if ( s == null )
                    exit();
                else if (s.trim().equals("CANCEL"))
                {
                    // Rollback the messages. A new transaction is implicitly
                    // started for following messages.
                    System.out.print ("Cancelling messages...");
                    sendSession.rollback();
                    System.out.println ("Staged messages have been cleared.");
                }
                else if ( s.length() > 0 && sQueue != null)
                {
                    javax.jms.TextMessage msg = sendSession.createTextMessage();
                    msg.setText( username + ": " + s );
                    // Queues usually are used for PERSISTENT messages.
                    // Hold messages for 30 minutes (1,800,000 millisecs).
                    sender.send( msg,
                                 javax.jms.DeliveryMode.PERSISTENT,
                                 javax.jms.Message.DEFAULT_PRIORITY,
                                 MESSAGE_LIFESPAN);
                    // See if we should send the messages
                    if (s.trim().equals("COMMIT"))
                    {
                        // Commit (send) the messages. A new transaction is
                        // implicitly  started for following messages.
                        System.out.print ("Committing messages...");
                        sendSession.commit();
                        System.out.println ("Staged messages have all been sent.");
                    }
                }
            }
        }
        catch ( java.io.IOException ioe )
        {
            ioe.printStackTrace();
        }
        catch ( javax.jms.JMSException jmse )
        {
            jmse.printStackTrace();
        }
        // Close the connection.
        exit();
    }

    /**
     * Handle the message
     * (as specified in the javax.jms.MessageListener interface).
     */
    public void onMessage( javax.jms.Message aMessage)
    {
        try
        {
            // Cast the message as a text message.
            javax.jms.TextMessage textMessage = (javax.jms.TextMessage) aMessage;

            // This handler reads a single String from the
            // message and prints it to the standard output.
            try
            {
                String string = textMessage.getText();
                System.out.println( string );
            }
            catch (javax.jms.JMSException jmse)
            {
                jmse.printStackTrace();
            }
        }
        catch (java.lang.RuntimeException rte)
        {
            rte.printStackTrace();
        }
    }

    /** Cleanup resources and then exit. */
    private void exit()
    {
        try
        {
            sendSession.rollback(); // Rollback any uncommitted messages.
            connect.close();
        }
        catch (javax.jms.JMSException jmse)
        {
            jmse.printStackTrace();
        }

        System.exit(0);
    }

    //
    // NOTE: the remainder of this sample deals with reading arguments
    // and does not utilize any JMS classes or code.
    //

    /** Main program entry point. */
    public static void main(String argv[]) {

        // Is there anything to do?
        if (argv.length == 0) {
            printUsage();
            System.exit(1);
        }

        // Values to be read from parameters
        String broker    	= DEFAULT_BROKER_NAME;
        String username  	= null;
        String password  	= DEFAULT_PASSWORD;
        String qSender		= null;
        String qReceiver	= null;

        // Check parameters
        for (int i = 0; i < argv.length; i++) {
            String arg = argv[i];

            // Options
            if (!arg.startsWith("-")) {
                System.err.println ("error: unexpected argument - "+arg);
                printUsage();
                System.exit(1);
            }
            else {
                if (arg.equals("-b")) {
                    if (i == argv.length - 1 || argv[i+1].startsWith("-")) {
                        System.err.println("error: missing broker name:port");
                        System.exit(1);
                    }
                    broker = argv[++i];
                    continue;
                }

                if (arg.equals("-u")) {
                    if (i == argv.length - 1 || argv[i+1].startsWith("-")) {
                        System.err.println("error: missing user name");
                        System.exit(1);
                    }
                    username = argv[++i];
                    continue;
                }

                if (arg.equals("-p")) {
                    if (i == argv.length - 1 || argv[i+1].startsWith("-")) {
                        System.err.println("error: missing password");
                        System.exit(1);
                    }
                    password = argv[++i];
                    continue;
                }

                if (arg.equals("-qr")) {
                    if (i == argv.length - 1 || argv[i+1].startsWith("-")) {
                        System.err.println("error: missing receive queue parameter");
                        System.exit(1);
                    }
                    qReceiver = argv[++i];
                    continue;
                }

                if (arg.equals("-qs")) {
                    if (i == argv.length - 1 || argv[i+1].startsWith("-")) {
                        System.err.println("error: missing send queue parameter");
                        System.exit(1);
                    }
                    qSender = argv[++i];
                    continue;
                }


                if (arg.equals("-h")) {
                    printUsage();
                    System.exit(1);
                }
            }
        }

        // Check values read in.
        if (username == null) {
            System.err.println ("error: user name must be supplied");
            printUsage();
            System.exit(1);
        }

        if (qReceiver == null && qSender == null) {
            System.err.println ("error: receive queue, or send queue, must be supplied");
            printUsage();
            System.exit(1);
        }

        // Start the JMS client for the "Talk".
        TransactedTalk tranTalk = new TransactedTalk();
        tranTalk.talker (broker, username, password, qReceiver, qSender);

    }

    /** Prints the usage. */
    private static void printUsage() {

        StringBuffer use = new StringBuffer();
        use.append("usage: java TransactedTalk (options) ...\n\n");
        use.append("options:\n");
        use.append("  -b name:port Specify name:port of broker.\n");
        use.append("               Default broker: "+DEFAULT_BROKER_NAME+"\n");
        use.append("  -u name      Specify unique user name. (Required)\n");
        use.append("  -p password  Specify password for user.\n");
        use.append("               Default password: "+DEFAULT_PASSWORD+"\n");
        use.append("  -qr queue    Specify queue for receiving messages.\n");
        use.append("  -qs queue    Specify queue for sending messages.\n");
        use.append("  -h           This help screen.\n");
        System.err.println (use);
    }

}
