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Appendix C. Endpoint Implementation Classes

The example below is the demonstration application configuration mentioned in Section 19.3.2.1, “JAX-WS Service Context Handlers”.

Example C.1. Application Configuration (context-handlers.xml)

<?xml version="1.0" encoding="UTF-8"?>
<!--
-->
<handler-chains xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee">
    <handler-chain>
	<handler>
		<handler-name>ContextHandler</handler-name>
		<handler-class>com.arjuna.mw.wst11.service.JaxWSHeaderContextProcessor</handler-class>
	</handler>
    </handler-chain>
</handler-chains>
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The following four code samples are demonstration implementations of the javax.jws.WebService and javax.jws.HandlerChain annotations which are discussed in Section 19.3.2.1, “JAX-WS Service Context Handlers”.

Example C.2. RestaurantServiceAT.java

package com.jboss.jbosstm.xts.demo.services.restaurant;

import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.mw.wst11.TransactionManagerFactory;
import com.arjuna.mw.wst11.UserTransactionFactory;
import com.jboss.jbosstm.xts.demo.restaurant.IRestaurantServiceAT;
import com.jboss.jbosstm.xts.demo.services.recovery.DemoATRecoveryModule;

import javax.jws.HandlerChain;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.soap.SOAPBinding;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.jboss.jbossts.xts.recovery.participant.at.XTSATRecoveryManager;

/**
 * An adapter class that exposes the RestaurantManager business API as a
 * transactional Web Service. Also logs events to a RestaurantView object.
 *
 * @author Jonathan Halliday (jonathan.halliday@arjuna.com)
 * @version $Revision: 1.3 $
 */
@WebService(serviceName="RestaurantServiceATService", portName="RestaurantServiceAT",
        name = "IRestaurantServiceAT", targetNamespace = "http://www.jboss.com/jbosstm/xts/demo/Restaurant",
        wsdlLocation = "/WEB-INF/wsdl/RestaurantServiceAT.wsdl")
@HandlerChain(file = "../context-handlers.xml", name = "Context Handlers")                  
@SOAPBinding(style=SOAPBinding.Style.RPC)
public class RestaurantServiceAT implements IRestaurantServiceAT
{
    /**
     * ensure that the recovery module for the dmeo is installed
     */
    @PostConstruct
    void postConstruct()
    {
        // ensure that the xts-demo AT recovery helper module is registered
        DemoATRecoveryModule.register();
    }

    /**
     * ensure that the recovery module for the dmeo is deinstalled
     */
    @PreDestroy
    void preDestroy()
    {
        // ensure that the xts-demo AT recovery helper module is registered
        DemoATRecoveryModule.unregister();
    }

    /**
     * Book a number of seats in the restaurant
     * Enrols a Participant if necessary, then passes
     * the call through to the business logic.
     *
     * @param how_many The number of seats to book
     */
    @WebMethod
    public void bookSeats(
            @WebParam(name = "how_many", partName = "how_many")
            int how_many)
    {
        RestaurantView restaurantView = RestaurantView.getSingletonInstance();
        RestaurantManager restaurantManager = RestaurantManager.getSingletonInstance();

        String transactionId = null;
        try
        {
            // get the transaction context of this thread:
            transactionId = UserTransactionFactory.userTransaction().toString();
            System.out.println("RestaurantServiceAT transaction id =" + transactionId);

            if (!restaurantManager.knowsAbout(transactionId))
            {
                System.out.println("RestaurantServiceAT - enrolling...");
                // enlist the Participant for this service:
                RestaurantParticipantAT restaurantParticipant = new RestaurantParticipantAT(transactionId);
                TransactionManagerFactory.transactionManager().enlistForDurableTwoPhase(restaurantParticipant, "org.jboss.jbossts.xts-demo:restaurantAT:" + new Uid().toString());
            }
        }
        catch (Exception e)
        {
            System.err.println("bookSeats: Participant enrolment failed");
            e.printStackTrace(System.err);
            return;
        }

        restaurantView.addMessage("******************************");

        restaurantView.addMessage("id:" + transactionId + ". Received a booking request for one table of " + how_many + " people");

        restaurantManager.bookSeats(transactionId, how_many);

        restaurantView.addMessage("Request complete\n");
        restaurantView.updateFields();
    }
}
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Example C.3. TaxiServiceBA.java

package com.jboss.jbosstm.xts.demo.services.taxi;

import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.mw.wst11.BusinessActivityManagerFactory;
import com.arjuna.mw.wst11.BusinessActivityManager;
import com.arjuna.wst11.BAParticipantManager;
import com.arjuna.wst.SystemException;
import com.jboss.jbosstm.xts.demo.taxi.ITaxiServiceBA;

import javax.jws.HandlerChain;
import javax.jws.WebMethod;
import javax.jws.WebResult;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;

/**
 * An adapter class that exposes the TaxiManager business API as a
 * transactional Web Service. Also logs events to a TaxiView object.
 *
 * @author Jonathan Halliday (jonathan.halliday@arjuna.com)
 * @version $Revision: 1.5 $
 */
@WebService(serviceName="TaxiServiceBAService", portName="TaxiServiceBA",
        name = "ITaxiServiceBA", targetNamespace = "http://www.jboss.com/jbosstm/xts/demo/Taxi",
        wsdlLocation = "/WEB-INF/wsdl/TaxiServiceBA.wsdl")
@HandlerChain(file = "../context-handlers.xml", name = "Context Handlers")
@SOAPBinding(style=SOAPBinding.Style.RPC)
public class TaxiServiceBA implements ITaxiServiceBA
{
    /**
     * Book a taxi
     * Enrols a Participant if necessary and passes
     * the call through to the business logic.
     *
     * @return true on success, false otherwise.
     */
    @WebMethod
    @WebResult(name = "bookTaxiBAResponse", partName = "bookTaxiBAResponse")
    public boolean bookTaxi()
    {
        TaxiView taxiView = TaxiView.getSingletonInstance();
        TaxiManager taxiManager = TaxiManager.getSingletonInstance();

        BusinessActivityManager activityManager = BusinessActivityManagerFactory.businessActivityManager();

        // get the transaction context of this thread:
        String transactionId = null;
        try
        {
            transactionId = activityManager.currentTransaction().toString();
        }
        catch (SystemException e)
        {
            System.err.println("bookTaxi: unable to obtain a transaction context!");
            e.printStackTrace(System.err);
            return false;
        }

        // log the event:
        System.out.println("TaxiServiceBA transaction id =" + transactionId);

        taxiView.addMessage("******************************");

        taxiView.addPrepareMessage("id:" + transactionId.toString() + ". Received a taxi booking request");
        taxiView.updateFields();

        // invoke the backend business logic:
        taxiManager.bookTaxi(transactionId);

        // attempt to finalise the booking
        if (taxiManager.prepareTaxi(transactionId))
        {
            taxiView.addMessage("id:" + transactionId + ". Seats prepared, trying to commit and enlist compensation Participant");
            taxiView.updateFields();

            // it worked, so now we need a participant enlisted in case of compensation:
            TaxiParticipantBA taxiParticipant = new TaxiParticipantBA(transactionId);
            // enlist the Participant for this service:
            BAParticipantManager participantManager = null;
            try
            {
                participantManager = activityManager.enlistForBusinessAgreementWithParticipantCompletion(taxiParticipant, "org.jboss.jbossts.xts-demo:restaurantBA:" + new Uid().toString());
            }
            catch (Exception e)
            {
                taxiView.addMessage("id:" + transactionId + ". Participant enrolement failed");
                taxiManager.cancelTaxi(transactionId);
                System.err.println("bookTaxi: Participant enrolment failed");
                e.printStackTrace(System.err);
                return false;
            }

            // finish the booking in the backend ensuring it is compensatable:
            taxiManager.commitTaxi(transactionId, true);

            try
            {
                // tell the manager we have finished our work:
                participantManager.completed();
            }
            catch (Exception e)
            {
                System.err.println("bookTaxi: 'completed' callback failed");
                taxiManager.cancelTaxi(transactionId);
                e.printStackTrace(System.err);
                return false;
            }
        }
        else
        {
            taxiView.addMessage("id:" + transactionId + ". Failed to reserve taxi. Cancelling.");
            taxiManager.cancelTaxi(transactionId);
            taxiView.updateFields();
            return false;
        }

        taxiView.addMessage("Request complete\n");
        taxiView.updateFields();

        return true;
    }
}
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Example C.4. TaxiServiceAT.java

package com.jboss.jbosstm.xts.demo.services.taxi;

import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.mw.wst11.TransactionManagerFactory;
import com.arjuna.mw.wst11.UserTransactionFactory;
import com.jboss.jbosstm.xts.demo.taxi.ITaxiServiceAT;
import com.jboss.jbosstm.xts.demo.services.recovery.DemoATRecoveryModule;

import javax.jws.WebService;
import javax.jws.HandlerChain;
import javax.jws.WebMethod;
import javax.jws.soap.SOAPBinding;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

/**
 * An adapter class that exposes the TaxiManager business API as a
 * transactional Web Service. Also logs events to a TaxiView object.
 *
 * @author Jonathan Halliday (jonathan.halliday@arjuna.com)
 * @version $Revision: 1.3 $
 */
@WebService(serviceName="TaxiServiceATService", portName="TaxiServiceAT",
        name = "ITaxiServiceAT", targetNamespace = "http://www.jboss.com/jbosstm/xts/demo/Taxi",
        wsdlLocation = "/WEB-INF/wsdl/TaxiServiceAT.wsdl")
@HandlerChain(file = "../context-handlers.xml", name = "Context Handlers")
@SOAPBinding(style=SOAPBinding.Style.RPC)
public class TaxiServiceAT implements ITaxiServiceAT
{
    /**
     * ensure that the recovery module for the dmeo is installed
     */
    @PostConstruct
    void postConstruct()
    {
        // ensure that the xts-demo AT recovery helper module is registered
        DemoATRecoveryModule.register();
    }

    /**
     * ensure that the recovery module for the dmeo is deinstalled
     */
    @PreDestroy
    void preDestroy()
    {
        // ensure that the xts-demo AT recovery helper module is registered
        DemoATRecoveryModule.unregister();
    }

    /**
     * Book a taxi
     * Enrols a Participant if necessary, then passes
     * the call through to the business logic.
     */
    @WebMethod
    public void bookTaxi()
    {
        TaxiView taxiView = TaxiView.getSingletonInstance();
        TaxiManager taxiManager = TaxiManager.getSingletonInstance();

        String transactionId = null;
        try
        {
            // get the transaction context of this thread:
            transactionId = UserTransactionFactory.userTransaction().toString();
            System.out.println("TaxiServiceAT transaction id =" + transactionId);

            if (!taxiManager.knowsAbout(transactionId))
            {
                System.out.println("TaxiServiceAT - enrolling...");
                // enlist the Participant for this service:
                TaxiParticipantAT taxiParticipant = new TaxiParticipantAT(transactionId);
                TransactionManagerFactory.transactionManager().enlistForDurableTwoPhase(taxiParticipant, "org.jboss.jbossts.xts-demo:taxiAT:" + new Uid().toString());
            }
        }
        catch (Exception e)
        {
            System.err.println("bookTaxi: Participant enrolment failed");
            e.printStackTrace(System.err);
            return;
        }

        taxiView.addMessage("******************************");

        taxiView.addMessage("id:" + transactionId.toString() + ". Received a taxi booking request");

        TaxiManager.getSingletonInstance().bookTaxi(transactionId);

        taxiView.addMessage("Request complete\n");
        taxiView.updateFields();
    }
}
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Example C.5. TheatreServiceAT.java

package com.jboss.jbosstm.xts.demo.services.theatre;

import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.mw.wst11.TransactionManagerFactory;
import com.arjuna.mw.wst11.UserTransactionFactory;
import com.jboss.jbosstm.xts.demo.theatre.ITheatreServiceAT;
import com.jboss.jbosstm.xts.demo.services.recovery.DemoATRecoveryModule;

import javax.jws.WebService;
import javax.jws.WebParam;
import javax.jws.HandlerChain;
import javax.jws.WebMethod;
import javax.jws.soap.SOAPBinding;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

/**
 * An adapter class that exposes the TheatreManager business API as a
 * transactional Web Service. Also logs events to a TheatreView object.
 *
 * @author Jonathan Halliday (jonathan.halliday@arjuna.com)
 * @version $Revision: 1.3 $
 */
@WebService(serviceName="TheatreServiceATService", portName="TheatreServiceAT",
        name = "ITheatreServiceAT", targetNamespace = "http://www.jboss.com/jbosstm/xts/demo/Theatre",
        wsdlLocation = "/WEB-INF/wsdl/TheatreServiceAT.wsdl")
@HandlerChain(file = "../context-handlers.xml", name = "Context Handlers")
@SOAPBinding(style=SOAPBinding.Style.RPC)
public class TheatreServiceAT implements ITheatreServiceAT
{
    /**
     * ensure that the recovery module for the dmeo is installed
     */
    @PostConstruct
    void postConstruct()
    {
        // ensure that the xts-demo AT recovery helper module is registered
        DemoATRecoveryModule.register();
    }

    /**
     * ensure that the recovery module for the dmeo is deinstalled
     */
    @PreDestroy
    void preDestroy()
    {
        // ensure that the xts-demo AT recovery helper module is registered
        DemoATRecoveryModule.unregister();
    }

    /**
     * Book a number of seats in the Theatre
     * Enrols a Participant if necessary, then passes
     * the call through to the business logic.
     *
     * @param how_many   The number of seats to book
     * @param which_area The area of the theatre to book seats in
     */
    @WebMethod
    public void bookSeats(
        @WebParam(name = "how_many", partName = "how_many")
        int how_many,
        @WebParam(name = "which_area", partName = "which_area")
        int which_area)
    {
        TheatreView theatreView = TheatreView.getSingletonInstance();
        TheatreManager theatreManager = TheatreManager.getSingletonInstance();

        String transactionId = null;
        try
        {
            // get the transaction context of this thread:
            transactionId = UserTransactionFactory.userTransaction().toString();
            System.out.println("TheatreServiceAT transaction id =" + transactionId);

            if (!theatreManager.knowsAbout(transactionId))
            {
                System.out.println("theatreService - enrolling...");
                // enlist the Participant for this service:
                TheatreParticipantAT theatreParticipant = new TheatreParticipantAT(transactionId);
                TransactionManagerFactory.transactionManager().enlistForDurableTwoPhase(theatreParticipant, "org.jboss.jbossts.xts-demo:theatreAT:" + new Uid().toString());
            }
        }
        catch (Exception e)
        {
            System.err.println("bookSeats: Participant enrolment failed");
            e.printStackTrace(System.err);
            return;
        }

        theatreView.addMessage("******************************");

        theatreView.addMessage("id:" + transactionId.toString() + ". Received a theatre booking request for " + how_many + " seats in area " + which_area);

        TheatreManager.getSingletonInstance().bookSeats(transactionId, how_many, which_area);

        theatreView.addMessage("Request complete\n");
        theatreView.updateFields();
    }
}
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