| package org.apache.commons.jelly.tags.quartz; |
| |
| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * 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. |
| */ |
| |
| import org.apache.commons.jelly.TagSupport; |
| import org.quartz.Scheduler; |
| import org.quartz.SchedulerException; |
| import org.quartz.impl.StdSchedulerFactory; |
| |
| /** Basic support for all tags requiring a Quartz scheduler. |
| * |
| * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> |
| */ |
| public abstract class QuartzTagSupport extends TagSupport |
| { |
| /** The scheduler variable name in the JellyContext. */ |
| public static final String SCHED_VAR_NAME = "org.apache.commons.jelly.quartz.Scheduler"; |
| |
| |
| /** Retrieve or create a scheduler. |
| * |
| * <p> |
| * If a scheduler has already been created an installed |
| * in the variable {@link #SCHED_VAR_NAME}, then that scheduler |
| * will be returned. Otherwise, a new StdScheduler will be |
| * created, started, and installed. Additionally, a runtime |
| * shutdown hook will be added to cleanly shutdown the scheduler. |
| * |
| * @return The scheduler. |
| * |
| * @throws SchedulerException If there is an error creating the |
| * scheduler. |
| */ |
| public Scheduler getScheduler() throws SchedulerException |
| { |
| Scheduler sched = (Scheduler) getContext().getVariable( SCHED_VAR_NAME ); |
| |
| if ( sched == null ) |
| { |
| StdSchedulerFactory factory = new StdSchedulerFactory(); |
| |
| final Scheduler newSched = factory.getScheduler(); |
| |
| sched = newSched; |
| |
| getContext().setVariable( SCHED_VAR_NAME, |
| newSched ); |
| |
| Runtime.getRuntime().addShutdownHook( |
| new Thread() { |
| public void run() |
| { |
| try |
| { |
| if ( ! newSched.isShutdown() ) |
| { |
| newSched.shutdown(); |
| } |
| } |
| catch (SchedulerException e) |
| { |
| e.printStackTrace(); |
| } |
| } |
| } |
| ); |
| newSched.start(); |
| } |
| |
| |
| return sched; |
| } |
| } |
| |