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Quartz Enterprise Job Scheduler - additional library of ready to use Jobs
/*
* All content copyright Terracotta, Inc., unless otherwise indicated. 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.
*
*/
package org.quartz.jobs.ee.ejb;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.rmi.RemoteException;
import java.util.Hashtable;
import javax.ejb.EJBHome;
import javax.ejb.EJBMetaData;
import javax.ejb.EJBObject;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;
import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
/**
*
* A Job that invokes a method on an EJB.
*
*
*
* Expects the properties corresponding to the following keys to be in the
* JobDataMap when it executes:
*
* EJB_JNDI_NAME_KEY- the JNDI name (location) of the
* EJB's home interface.EJB_METHOD_KEY- the name of the method to invoke on the
* EJB.EJB_ARGS_KEY- an Object[] of the args to pass to the
* method (optional, if left out, there are no arguments).EJB_ARG_TYPES_KEY- an Class[] of the types of the args to
* pass to the method (optional, if left out, the types will be derived by
* calling getClass() on each of the arguments).
*
* The following keys can also be used at need:
*
* INITIAL_CONTEXT_FACTORY - the context factory used to
* build the context.PROVIDER_URL - the name of the environment property
* for specifying configuration information for the service provider to use.
*
*
*
*
* The result of the EJB method invocation will be available to
* Job/TriggerListeners via
* {@link org.quartz.JobExecutionContext#getResult()}.
*
*
* @author Andrew Collins
* @author James House
* @author Joel Shellman
* @author Chris Bonham
*/
public class EJBInvokerJob implements Job {
/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Constants.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
public static final String EJB_JNDI_NAME_KEY = "ejb";
public static final String EJB_METHOD_KEY = "method";
public static final String EJB_ARG_TYPES_KEY = "argTypes";
public static final String EJB_ARGS_KEY = "args";
public static final String INITIAL_CONTEXT_FACTORY = "java.naming.factory.initial";
public static final String PROVIDER_URL = "java.naming.provider.url";
public static final String PRINCIPAL = "java.naming.security.principal";
public static final String CREDENTIALS = "java.naming.security.credentials";
/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Constructors.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
public EJBInvokerJob() {
// nothing
}
/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Interface.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
public void execute(JobExecutionContext context)
throws JobExecutionException {
JobDataMap dataMap = context.getMergedJobDataMap();
String ejb = dataMap.getString(EJB_JNDI_NAME_KEY);
String method = dataMap.getString(EJB_METHOD_KEY);
Object[] arguments = (Object[]) dataMap.get(EJB_ARGS_KEY);
if (arguments == null) {
arguments = new Object[0];
}
if (ejb == null) {
// must specify remote home
throw new JobExecutionException();
}
InitialContext jndiContext = null;
// get initial context
try {
jndiContext = getInitialContext(dataMap);
} catch (NamingException ne) {
throw new JobExecutionException(ne);
}
try {
Object value = null;
// locate home interface
try {
value = jndiContext.lookup(ejb);
} catch (NamingException ne) {
throw new JobExecutionException(ne);
}
// get home interface
EJBHome ejbHome = (EJBHome) PortableRemoteObject.narrow(value,
EJBHome.class);
// get meta data
EJBMetaData metaData = null;
try {
metaData = ejbHome.getEJBMetaData();
} catch (RemoteException re) {
throw new JobExecutionException(re);
}
// get home interface class
Class homeClass = metaData.getHomeInterfaceClass();
// get remote interface class
Class remoteClass = metaData.getRemoteInterfaceClass();
// get home interface
ejbHome = (EJBHome) PortableRemoteObject.narrow(ejbHome, homeClass);
Method methodCreate = null;
try {
// create method 'create()' on home interface
methodCreate = homeClass.getMethod("create", ((Class[])null));
} catch (NoSuchMethodException nsme) {
throw new JobExecutionException(nsme);
}
// create remote object
EJBObject remoteObj = null;
try {
// invoke 'create()' method on home interface
remoteObj = (EJBObject) methodCreate.invoke(ejbHome, ((Object[])null));
} catch (IllegalAccessException iae) {
throw new JobExecutionException(iae);
} catch (InvocationTargetException ite) {
throw new JobExecutionException(ite);
}
// execute user-specified method on remote object
Method methodExecute = null;
try {
// create method signature
Class[] argTypes = (Class[]) dataMap.get(EJB_ARG_TYPES_KEY);
if (argTypes == null) {
argTypes = new Class[arguments.length];
for (int i = 0; i < arguments.length; i++) {
argTypes[i] = arguments[i].getClass();
}
}
// get method on remote object
methodExecute = remoteClass.getMethod(method, argTypes);
} catch (NoSuchMethodException nsme) {
throw new JobExecutionException(nsme);
}
try {
// invoke user-specified method on remote object
Object returnObj = methodExecute.invoke(remoteObj, arguments);
// Return any result in the JobExecutionContext so it will be
// available to Job/TriggerListeners
context.setResult(returnObj);
} catch (IllegalAccessException iae) {
throw new JobExecutionException(iae);
} catch (InvocationTargetException ite) {
throw new JobExecutionException(ite);
}
} finally {
// Don't close jndiContext until after method execution because
// WebLogic requires context to be open to keep the user credentials
// available. See JIRA Issue: QUARTZ-401
if (jndiContext != null) {
try {
jndiContext.close();
} catch (NamingException e) {
// Ignore any errors closing the initial context
}
}
}
}
protected InitialContext getInitialContext(JobDataMap jobDataMap)
throws NamingException {
Hashtable params = new Hashtable(2);
String initialContextFactory =
jobDataMap.getString(INITIAL_CONTEXT_FACTORY);
if (initialContextFactory != null) {
params.put(Context.INITIAL_CONTEXT_FACTORY, initialContextFactory);
}
String providerUrl = jobDataMap.getString(PROVIDER_URL);
if (providerUrl != null) {
params.put(Context.PROVIDER_URL, providerUrl);
}
String principal = jobDataMap.getString(PRINCIPAL);
if ( principal != null ) {
params.put( Context.SECURITY_PRINCIPAL, principal );
}
String credentials = jobDataMap.getString(CREDENTIALS);
if ( credentials != null ) {
params.put( Context.SECURITY_CREDENTIALS, credentials );
}
return (params.size() == 0) ? new InitialContext() : new InitialContext(params);
}
}