/*
* Copyright 2002-2007 the original author or authors.
*
* 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.springframework.scheduling.timer;
import java.util.Timer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.JdkVersion;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* FactoryBean that sets up a {@link java.util.Timer} and exposes it for bean references.
*
* <p>Allows for registration of {@link ScheduledTimerTask ScheduledTimerTasks},
* automatically starting the {@link Timer} on initialization and cancelling it
* on destruction of the context. In scenarios that just require static registration
* of tasks at startup, there is no need to access the {@link Timer} instance itself
* in application code at all.
*
* <p>Note that the {@link Timer} mechanism uses a {@link java.util.TimerTask}
* instance that is shared between repeated executions, in contrast to Quartz
* which creates a new Job instance for each execution.
*
* @author Juergen Hoeller
* @since 19.02.2004
* @see ScheduledTimerTask
* @see java.util.Timer
* @see java.util.TimerTask
*/
public class TimerFactoryBean implements FactoryBean, BeanNameAware, InitializingBean, DisposableBean {
protected final Log logger = LogFactory.getLog(getClass());
private ScheduledTimerTask[] scheduledTimerTasks;
private boolean daemon = false;
private String beanName;
private Timer timer;
/**
* Register a list of ScheduledTimerTask objects with the Timer that
* this FactoryBean creates. Depending on each SchedulerTimerTask's
* settings, it will be registered via one of Timer's schedule methods.
* @see java.util.Timer#schedule(java.util.TimerTask, long)
* @see java.util.Timer#schedule(java.util.TimerTask, long, long)
* @see java.util.Timer#scheduleAtFixedRate(java.util.TimerTask, long, long)
*/
public void setScheduledTimerTasks(ScheduledTimerTask[] scheduledTimerTasks) {
this.scheduledTimerTasks = scheduledTimerTasks;
}
/**
* Set whether the timer should use a daemon thread,
* just executing as long as the application itself is running.
* <p>Default is "false": The timer will automatically get cancelled on
* destruction of this FactoryBean. Hence, if the application shuts down,
* tasks will by default finish their execution. Specify "true" for eager
* shutdown of threads that execute tasks.
* @see java.util.Timer#Timer(boolean)
*/
public void setDaemon(boolean daemon) {
this.daemon = daemon;
}
public void setBeanName(String beanName) {
this.beanName = beanName;
}
public void afterPropertiesSet() {
logger.info("Initializing Timer");
this.timer = createTimer(this.beanName, this.daemon);
// Register specified ScheduledTimerTasks, if necessary.
if (!ObjectUtils.isEmpty(this.scheduledTimerTasks)) {
registerTasks(this.scheduledTimerTasks, this.timer);
}
}
/**
* Create a new Timer instance. Called by <code>afterPropertiesSet</code>.
* Can be overridden in subclasses to provide custom Timer subclasses.
* <p>Uses the specified name as Timer thread name on JDK 1.5,
* simply falling back to a default Timer thread on JDK 1.4.
* @param name the desired name of the Timer's associated thread
* (applied on JDK 1.5 and higher; ignored on JDK 1.4)
* @param daemon whether to create a Timer that runs as daemon thread
* @return a new Timer instance
* @see #afterPropertiesSet()
* @see java.util.Timer#Timer(boolean)
*/
protected Timer createTimer(String name, boolean daemon) {
Timer timer = createTimer(daemon);
if (timer != null) {
return timer;
}
if (StringUtils.hasText(name) && JdkVersion.isAtLeastJava15()) {
return new Timer(name, daemon);
}
else {
return new Timer(daemon);
}
}
/**
* Create a new Timer instance. Called by <code>afterPropertiesSet</code>.
* Can be overridden in subclasses to provide custom Timer subclasses.
* @deprecated as of Spring 2.0.1, in favor of {@link #createTimer(String, boolean)}
*/
protected Timer createTimer(boolean daemon) {
return null;
}
/**
* Register the specified {@link ScheduledTimerTask ScheduledTimerTasks}
* on the given {@link Timer}.
* @param tasks the specified ScheduledTimerTasks (never empty)
* @param timer the Timer to register the tasks on.
*/
protected void registerTasks(ScheduledTimerTask[] tasks, Timer timer) {
for (int i = 0; i < tasks.length; i++) {
ScheduledTimerTask task = tasks[i];
if (task.isOneTimeTask()) {
timer.schedule(task.getTimerTask(), task.getDelay());
}
else {
if (task.isFixedRate()) {
timer.scheduleAtFixedRate(task.getTimerTask(), task.getDelay(), task.getPeriod());
}
else {
timer.schedule(task.getTimerTask(), task.getDelay(), task.getPeriod());
}
}
}
}
public Object getObject() {
return this.timer;
}
public Class getObjectType() {
return Timer.class;
}
public boolean isSingleton() {
return true;
}
/**
* Cancel the Timer on bean factory shutdown, stopping all scheduled tasks.
* @see java.util.Timer#cancel()
*/
public void destroy() {
logger.info("Cancelling Timer");
this.timer.cancel();
}
}