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/* 
 * Copyright 2001-2009 Terracotta, Inc. 
 * 
 * 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
                }
            }
        }
    }

    private 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);
    }    
}