Job Scheduling From Web Dynpro Java for CE 7.1 Using Java Scheduler API and EJB3.0 (1)

8/17/2019 Job Scheduling From Web Dynpro Java for CE 7.1 Using Java Scheduler API and EJB3.0 (1)

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ILL BE Job Scheduling from WebDynpro Java for CE 7.1 Using JavaScheduler API and EJB3.0

Appl ies to:

SAP NetWeaver 7.1, Web Dynpro for java, JEE 5, Java Scheduler. For more information, visit the UserInterface Technology homepage.

Summary

A new job scheduler is now available as part of the SAP NetWeaver Application Server, Java EE 5 Edition.

Using EJB 3.0 job is implemented as Message-Driven Bean (MDB), which is invoked using Java MessageService (JMS) technology.

Using scheduler API we can create tasks and set the job parameters through Web Dynpro.

Author : Snehal Kendre

Company: L&T Infotech

Created on: 08 October 2008

Author Bio

Snehal Kendre is an Web Dynpro consultant at L&T Infotech.

SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com

© 2008 SAP AG 1

https://www.sdn.sap.com/irj/sdn/nw-ui






ILL BE Job Scheduling from Web Dynpro Java for CE 7.1 Using Java Scheduler API and EJB3.0

Table of Contents

Getting started ....................................................................................................................................................3

Scenario .......................................................................................................................................................... 3

Creating an EJB 3.0 project................................................................................................................................3

Developing Job Bean class.............................................................................................................................5

Deploy EAR application project. .....................................................................................................................8

See The Job Definition in Java scheduler....................................................................................................................8

Implementation of Web Dynpro project ..............................................................................................................9

Implementation of SchedulerCompView......................................................................................................................9

Deploy and run Web Dynpro project.............................................................................................................13

Run the Application...........................................................................................................................................13

Task information in Java Scheduler .................................................................................................................14

Successful execution of job........................................................................................................................................14

Related Content................................................................................................................................................15

Disclaimer and Liability Notice..........................................................................................................................16


© 2008 SAP AG 2




Getting started

Here we are going to create an EJB 3.0 project that includes a job bean.

The scheduler runtime service provides certain basic services to the job implementation. That is why, theJobBean class cannot implement the onMessage() method, which is the standard business method ofmessage-driven beans. JobBeans have a single business method, the onJob() method. In the JobBeanclass, you must provide an implementation of the onJob() method. The JobBean inherits from anMDBJobImplementation base class which itself provides an implementation of the onMessage() method.

To set the job parameters and schedule we will create a Web Dynpro project

Scenario

We will create a job using job beans which is nothing but a message-driven bean inheritedfrom an MDBJ obI mpl ementat i on base class.

A web Dynpro project will provide basic functionality to schedule a job and to set the job parameters.

Creating an EJB 3.0 project

Open JEE perspective. Create a new EJB project as we_JobEJB

Create an EAR Application project ja_JobEAR


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Select the project facets

Add we_JobEJB into ja_JobEAR

Choose the project facets for EJB project


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Developing Job Bean class

First add tc~je~scheduler~api~jar as an external jar in build path of we_JobEjb

Create a new message driven bean JobBean

Use javax.jm.queue as JMS destination type

Select MDBJ obI mpl ement at i on as a supercalss for jobbean


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And say finish.

Implementation of ejb-j2ee-engine.xml

Write down the JobBean specific settings in ej b- j 2ee- engi ne. xml

<?xml versi on="1. 0" encodi ng="UTF- 8"?>

<ej b- j 2ee- engi ne

xml ns: xsi ="htt p: / / www. w3. org/ 2001/ XMLSchema- i nstance">

<ent erpr i se- beans>

<ent erpr i se- bean>

<ej b- name> J obBean</ ej b- name>

<j ndi - name> J obBean</ j ndi - name>

<message- props>

<dest i nat i on- name> J obQueue</ dest i nat i on- name>

<connect i on- f act ory- name>

J obQueueFact ory

</ connect i on- f actory- name>

</ message- props>

</ ent er pr i se- bean>

</ ent erpri se- beans>

</ ej b- j 2ee- engi ne>

Create new xml for job information as j ob- def i ni t i ons. xml

< j ob- def i ni t i ons>

< j ob- def i ni t i on name="Schedul eJ ob"

descri pt i on="sampl e j ob for t est i ng">

< j ob- def i ni t i on- paramet er name="User"

data- t ype="St ri ng"

di rect i on="I N"/ >

</ j ob- def i ni t i on> </ j ob- def i ni t i ons>

Implementation of JobBean

/**

*

*/

package com.sap.jobbean;

import java.util.logging.Logger;

import javax.jms.MessageListener;


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import com.sap.scheduler.runtime.JobContext;

import com.sap.scheduler.runtime.JobParameter;

import com.sap.scheduler.runtime.mdb.MDBJobImplementation;

import javax.ejb.MessageDriven;

import javax.ejb.ActivationConfigProperty;

/**

* @author Snehal Kendre

*

*/

@MessageDriven(

//TODO The JMS destination name (mapped name) must correspond to the resource name in the jms-

resources.xml

name="JobBean", mappedName="MyDestination",

activationConfig={@ActivationConfigProperty(

propertyName="messageSelector",

propertyValue="JobDefinition='Schedule_JobBean'"),@ActivationConfigProperty(propertyName="de

stinationType", propertyValue="javax.jms.Queue")})

public class JobBean extends MDBJobImplementation implements MessageListener {

/* (non-Javadoc)

* @see

com.sap.scheduler.runtime.mdb.MDBJobImplementation#onJob(com.sap.scheduler.runtime.JobContext)*/

@Override

public void onJob(JobContext arg0) throws Exception {

// TODO Auto-generated method stub

JobParameter parameter = arg0.getJobParameter("User");

Logger logger = arg0.getLogger();

logger.info("Hi"+parameter+"your job is scheduled");

}

}

Implementation of the application-j2ee-engine.xml from ja_JobEAR

<?xml versi on="1. 0" encodi ng="UTF- 8"?> <appl i cat i on- j 2ee- engi ne xml ns: xsi ="htt p: / / www. w3. org/ 2001/ XMLSchema- i nst ance">

<provi der- name>sap. com</ provi der - name>

<r ef erence r ef erence- t ype="hard">

<r ef erence- t arget pr ovi der- name="sap. com" t ar get- t ype= "ser vi ce">

schedul er~r unt i me

</ r ef er ence- t ar get >

</ r ef erence>

<modul es- addi t i onal >

<modul e>

<ent r y- name>we_J obBean. j ar</ ent r y- name>

<cont ai ner- t ype>schedul er~cont ai ner </ cont ai ner- t ype>

</ modul e>

</ modul es- addi t i onal > </ appl i cat i on- j 2ee- engi ne>


© 2008 SAP AG 7




Deploy EAR application project.

Open the server view

Add the EAR application project

And finish it.

See The Job Definition in Java scheduler

We can see our job definition in SAP NetWeaver Administrator.

http://<hostname>:<port>/nwa

Operation Management-> Jobs

Click on Job Definitions


© 2008 SAP AG 8




Implementation of Web Dynpro project

Open web Dynpro development perspective and create a new project dp_SchedulerApp.

Create an application.

Create New components as SchedulerComp with window SchedulerWindow and SchedulerCompView.

First add tc~je~scheduler~api~jar as an external jar in build path

Implementation of SchedulerCompView.

Create a New simple type Months

With following Enumerations


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Create context for scheduler options as follow

Assign simple type Months to the ctx_va_Month, String type to ctx_va_user and assign Integer to othercontext.

Create a form to take inputs from user. For this use apply template.

Say finish and create a form.


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Create an action button to submit information to java scheduler.

Apply action button template.

Implement onActionSchedule() as follow

public void onActionSchedule(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent

wdEvent )

{

//@@begin onActionSchedule(ServerEvent)

Scheduler syncscheduler;

try {

InitialContext ctx = new InitialContext();

syncscheduler = (Scheduler)ctx.lookup("scheduler");

JobDefinition syncdef =

syncscheduler.getJobDefinitionByName("Schedule_JobBean");

// SchedulerTaskID taskid = new SchedulerTaskID(2);

wdComponentAPI.getMessageManager().reportSuccess(syncdef.getDescription());

Job syncjob;

java.util.Calendar calendar = java.util.Calendar.getInstance ();

calendar.set(Calendar.YEAR ,

wdContext.currentContextElement().getCtx_va_year());

calendar.set(Calendar.MONTH ,wdContext.currentContextElement().getCtx_va_Month()-1);

calendar.set(Calendar.DAY_OF_MONTH ,

wdContext.currentContextElement().getCtx_va_day());

calendar.set(Calendar.HOUR_OF_DAY ,

wdContext.currentContextElement().getCtx_va_hour());


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calendar.set(Calendar.MINUTE ,

wdContext.currentContextElement().getCtx_va_min());

java.util.Date date = calendar.getTime();

wdComponentAPI.getMessageManager().reportSuccess("your task is scheduled

for date="+ date);

//Create SchedulerTime and pass to it the Calendar instance

SchedulerTime time = new SchedulerTime(date, TimeZone.getDefault ());

//Create RecurringEntry and pass to it SchedulerTime instance

RecurringEntry re = new RecurringEntry(time);

//Create a SchedulerTask for the HelloJob

// set job paramater

JobParameterDefinition user = syncdef.getParameter("User");

JobParameter userparameter = new

JobParameter(user,wdContext.currentContextElement().getCtx_va_user());

SchedulerTask task = new

SchedulerTask(SchedulerTaskID.newID (),syncdef.getJobDefinitionId(),new JobParameter[]

{userparameter},new RecurringEntry[] {re}, new CronEntry[]

{},"Schedule_Job","scheduled by API");

syncscheduler.schedule(task);

//

task.createSchedulerTask(syncdef.getJobDefinitionId(),parm,recs,crons,filters,23,

"synctaskbywd","wd generated task",null);

// syncscheduler.schedule(task);

} catch (Exception e) {

// TODO Auto-generated catch block

wdComponentAPI.getMessageManager().reportException("problem in

scheduler",true);

}

//@@end }


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Deploy and run Web Dynpro project

Build project and create its archive

Deploy and run the application

Run the Application

Run the application in browser.

Get the confirmation after scheduling the job.


© 2008 SAP AG 13




Task information in Java Scheduler

We can see our job definition in SAP NetWeaver Administrator.

http://<hostname>:<port>/nwa

Check the scheduled task in Java Scheduler

Successful execution of job

Check log


© 2008 SAP AG 14




Related Content

https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10fed553-0e01-0010-9bb8-ed55659e1236

https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/e8ab5056-0e01-0010-5581-d3e51724ee21

http://help.sap.com/saphelp_nwce10/helpdata/en/44/03d66015ee10b3e10000000a11466f/frameset.htm

For more information, visit the User Interface Technology homepage.


© 2008 SAP AG 15
















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Disclaimer and Liabili ty Notice

This document may discuss sample coding or other information that does not include SAP official interfaces and therefore is notsupported by SAP. Changes made based on this information are not supported and can be overwritten during an upgrade.

SAP will not be held liable for any damages caused by using or misusing the information, code or methods suggested in this document,and anyone using these methods does so at his/her own risk.

SAP offers no guarantees and assumes no responsibility or liability of any type with respect to the content of this technical article orcode sample, including any liability resulting from incompatibility between the content within this document and the materials andservices offered by SAP. You agree that you will not hold, or seek to hold, SAP responsible or liable with respect to the content of thisdocument.

Job Scheduling From Web Dynpro Java for CE 7.1 Using Java Scheduler API and EJB3.0 (1)

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