lm-sistemi-software-distribuiti/src/main/kotlin/util/jms/replier/AbstarctReplier.kt

package util.jms.replier

import java.io.Serializable
import javax.jms.Message
import javax.jms.Queue
import javax.jms.QueueConnectionFactory
import javax.jms.Session
import javax.jms.ObjectMessage
import javax.jms.TextMessage

abstract class AbstarctReplier(
    queueName: String,
    private val shared: Boolean = false
) : Replier {
    private val factory: QueueConnectionFactory = this.getFactory()
    private val connection = factory.createQueueConnection()
    private val mainSession = connection.createQueueSession(
        false,
        Session.AUTO_ACKNOWLEDGE
    )
    private val mainQueue = mainSession.createQueue(queueName)
    private val receiver = mainSession.createReceiver(mainQueue)
    private val secondarySession = connection.createQueueSession(
        false,
        Session.AUTO_ACKNOWLEDGE
    )

    override fun onRequest(buildResponse: (Message) -> Message) {
        receiver.setMessageListener {
            val replyQueue = it.jmsReplyTo as Queue
            val sender = secondarySession.createSender(replyQueue)
            val replyMessage = buildResponse(it)

            if (shared)
                replyMessage.jmsCorrelationID = it.jmsMessageID

            sender.send(replyMessage)
        }
    }

    override fun createTextMessage(text: String): TextMessage = mainSession.createTextMessage(text)

    override fun createObjectMessage(obj: Serializable?): ObjectMessage =
        mainSession.createObjectMessage(obj)

    override fun createMessage(): Message = mainSession.createMessage()

    override fun start() {
        connection.start()
    }

    override fun close() {
        mainSession.close()
        connection.close()
    }

    abstract fun getFactory(uri: String = "tcp://localhost:61616"): QueueConnectionFactory
}