/*
* 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.commonj;
import commonj.timers.TimerListener;
/**
* JavaBean that describes a scheduled TimerListener, consisting of
* the TimerListener itself (or a Runnable to create a TimerListener for)
* and a delay plus period. Period needs to be specified;
* there is no point in a default for it.
*
* <p>The CommonJ TimerManager does not offer more sophisticated scheduling
* options such as cron expressions. Consider using Quartz for such
* advanced needs.
*
* <p>Note that the TimerManager uses a TimerListener instance that is
* shared between repeated executions, in contrast to Quartz which
* instantiates a new Job for each execution.
*
* @author Juergen Hoeller
* @since 2.0
* @see commonj.timers.TimerListener
* @see commonj.timers.TimerManager#schedule(commonj.timers.TimerListener, long, long)
* @see commonj.timers.TimerManager#scheduleAtFixedRate(commonj.timers.TimerListener, long, long)
*/
public class ScheduledTimerListener {
private TimerListener timerListener;
private long delay = 0;
private long period = -1;
private boolean fixedRate = false;
/**
* Create a new ScheduledTimerListener,
* to be populated via bean properties.
* @see #setTimerListener
* @see #setDelay
* @see #setPeriod
* @see #setFixedRate
*/
public ScheduledTimerListener() {
}
/**
* Create a new ScheduledTimerListener, with default
* one-time execution without delay.
* @param timerListener the TimerListener to schedule
*/
public ScheduledTimerListener(TimerListener timerListener) {
this.timerListener = timerListener;
}
/**
* Create a new ScheduledTimerListener, with default
* one-time execution with the given delay.
* @param timerListener the TimerListener to schedule
* @param delay the delay before starting the task for the first time (ms)
*/
public ScheduledTimerListener(TimerListener timerListener, long delay) {
this.timerListener = timerListener;
this.delay = delay;
}
/**
* Create a new ScheduledTimerListener.
* @param timerListener the TimerListener to schedule
* @param delay the delay before starting the task for the first time (ms)
* @param period the period between repeated task executions (ms)
* @param fixedRate whether to schedule as fixed-rate execution
*/
public ScheduledTimerListener(TimerListener timerListener, long delay, long period, boolean fixedRate) {
this.timerListener = timerListener;
this.delay = delay;
this.period = period;
this.fixedRate = fixedRate;
}
/**
* Create a new ScheduledTimerListener, with default
* one-time execution without delay.
* @param timerTask the Runnable to schedule as TimerListener
*/
public ScheduledTimerListener(Runnable timerTask) {
setRunnable(timerTask);
}
/**
* Create a new ScheduledTimerListener, with default
* one-time execution with the given delay.
* @param timerTask the Runnable to schedule as TimerListener
* @param delay the delay before starting the task for the first time (ms)
*/
public ScheduledTimerListener(Runnable timerTask, long delay) {
setRunnable(timerTask);
this.delay = delay;
}
/**
* Create a new ScheduledTimerListener.
* @param timerTask the Runnable to schedule as TimerListener
* @param delay the delay before starting the task for the first time (ms)
* @param period the period between repeated task executions (ms)
* @param fixedRate whether to schedule as fixed-rate execution
*/
public ScheduledTimerListener(Runnable timerTask, long delay, long period, boolean fixedRate) {
setRunnable(timerTask);
this.delay = delay;
this.period = period;
this.fixedRate = fixedRate;
}
/**
* Set the Runnable to schedule as TimerListener.
* @see DelegatingTimerListener
*/
public void setRunnable(Runnable timerTask) {
this.timerListener = new DelegatingTimerListener(timerTask);
}
/**
* Set the TimerListener to schedule.
*/
public void setTimerListener(TimerListener timerListener) {
this.timerListener = timerListener;
}
/**
* Return the TimerListener to schedule.
*/
public TimerListener getTimerListener() {
return this.timerListener;
}
/**
* Set the delay before starting the task for the first time,
* in milliseconds. Default is 0, immediately starting the
* task after successful scheduling.
* <p>If the "firstTime" property is specified, this property will be ignored.
* Specify one or the other, not both.
*/
public void setDelay(long delay) {
this.delay = delay;
}
/**
* Return the delay before starting the job for the first time.
*/
public long getDelay() {
return this.delay;
}
/**
* Set the period between repeated task executions, in milliseconds.
* <p>Default is -1, leading to one-time execution. In case of zero or a
* positive value, the task will be executed repeatedly, with the given
* interval inbetween executions.
* <p>Note that the semantics of the period value vary between fixed-rate
* and fixed-delay execution.
* <p><b>Note:</b> A period of 0 (for example as fixed delay) <i>is</i>
* supported, because the CommonJ specification defines this as a legal value.
* Hence a value of 0 will result in immediate re-execution after a job has
* finished (not in one-time execution like with <code>java.util.Timer</code>).
* @see #setFixedRate
* @see #isOneTimeTask()
* @see commonj.timers.TimerManager#schedule(commonj.timers.TimerListener, long, long)
*/
public void setPeriod(long period) {
this.period = period;
}
/**
* Return the period between repeated task executions.
*/
public long getPeriod() {
return this.period;
}
/**
* Is this task only ever going to execute once?
* @return <code>true</code> if this task is only ever going to execute once
* @see #getPeriod()
*/
public boolean isOneTimeTask() {
return (this.period < 0);
}
/**
* Set whether to schedule as fixed-rate execution, rather than
* fixed-delay execution. Default is "false", i.e. fixed delay.
* <p>See TimerManager javadoc for details on those execution modes.
* @see commonj.timers.TimerManager#schedule(commonj.timers.TimerListener, long, long)
* @see commonj.timers.TimerManager#scheduleAtFixedRate(commonj.timers.TimerListener, long, long)
*/
public void setFixedRate(boolean fixedRate) {
this.fixedRate = fixedRate;
}
/**
* Return whether to schedule as fixed-rate execution.
*/
public boolean isFixedRate() {
return this.fixedRate;
}
}
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