|
|
The Timer.java Java example source code
/*
* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.management.timer;
import static com.sun.jmx.defaults.JmxProperties.TIMER_LOGGER;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.Vector;
import java.util.logging.Level;
// jmx imports
//
import javax.management.InstanceNotFoundException;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanRegistration;
import javax.management.MBeanServer;
import javax.management.NotificationBroadcasterSupport;
import javax.management.ObjectName;
/**
*
* Provides the implementation of the timer MBean.
* The timer MBean sends out an alarm at a specified time
* that wakes up all the listeners registered to receive timer notifications.
* <P>
*
* This class manages a list of dated timer notifications.
* A method allows users to add/remove as many notifications as required.
* When a timer notification is emitted by the timer and becomes obsolete,
* it is automatically removed from the list of timer notifications.
* <BR>Additional timer notifications can be added into regularly repeating notifications.
* <P>
*
* Note:
* <OL>
* <LI>When sending timer notifications, the timer updates the notification sequence number
* irrespective of the notification type.
* <LI>The timer service relies on the system date of the host where the Timer class is loaded.
* Listeners may receive untimely notifications
* if their host has a different system date.
* To avoid such problems, synchronize the system date of all host machines where timing is needed.
* <LI>The default behavior for periodic notifications is fixed-delay execution, as
* specified in {@link java.util.Timer}. In order to use <i>fixed-rate execution, use the
* overloaded {@link #addNotification(String, String, Object, Date, long, long, boolean)} method.
* <LI>Notification listeners are potentially all executed in the same
* thread. Therefore, they should execute rapidly to avoid holding up
* other listeners or perturbing the regularity of fixed-delay
* executions. See {@link NotificationBroadcasterSupport}.
* </OL>
*
* @since 1.5
*/
public class Timer extends NotificationBroadcasterSupport
implements TimerMBean, MBeanRegistration {
/*
* ------------------------------------------
* PUBLIC VARIABLES
* ------------------------------------------
*/
/**
* Number of milliseconds in one second.
* Useful constant for the <CODE>addNotification method.
*/
public static final long ONE_SECOND = 1000;
/**
* Number of milliseconds in one minute.
* Useful constant for the <CODE>addNotification method.
*/
public static final long ONE_MINUTE = 60*ONE_SECOND;
/**
* Number of milliseconds in one hour.
* Useful constant for the <CODE>addNotification method.
*/
public static final long ONE_HOUR = 60*ONE_MINUTE;
/**
* Number of milliseconds in one day.
* Useful constant for the <CODE>addNotification method.
*/
public static final long ONE_DAY = 24*ONE_HOUR;
/**
* Number of milliseconds in one week.
* Useful constant for the <CODE>addNotification method.
*/
public static final long ONE_WEEK = 7*ONE_DAY;
/*
* ------------------------------------------
* PRIVATE VARIABLES
* ------------------------------------------
*/
/**
* Table containing all the timer notifications of this timer,
* with the associated date, period and number of occurrences.
*/
final private Map<Integer,Object[]> timerTable =
new HashMap<>();
/**
* Past notifications sending on/off flag value.
* This attribute is used to specify if the timer has to send past notifications after start.
* <BR>The default value is set to false.
*/
private boolean sendPastNotifications = false;
/**
* Timer state.
* The default value is set to <CODE>false.
*/
private transient boolean isActive = false;
/**
* Timer sequence number.
* The default value is set to 0.
*/
private transient long sequenceNumber = 0;
// Flags needed to keep the indexes of the objects in the array.
//
private static final int TIMER_NOTIF_INDEX = 0;
private static final int TIMER_DATE_INDEX = 1;
private static final int TIMER_PERIOD_INDEX = 2;
private static final int TIMER_NB_OCCUR_INDEX = 3;
private static final int ALARM_CLOCK_INDEX = 4;
private static final int FIXED_RATE_INDEX = 5;
/**
* The notification counter ID.
* Used to keep the max key value inserted into the timer table.
*/
volatile private int counterID = 0;
private java.util.Timer timer;
/*
* ------------------------------------------
* CONSTRUCTORS
* ------------------------------------------
*/
/**
* Default constructor.
*/
public Timer() {
}
/*
* ------------------------------------------
* PUBLIC METHODS
* ------------------------------------------
*/
/**
* Allows the timer MBean to perform any operations it needs before being registered
* in the MBean server.
* <P>
* Not used in this context.
*
* @param server The MBean server in which the timer MBean will be registered.
* @param name The object name of the timer MBean.
*
* @return The name of the timer MBean registered.
*
* @exception java.lang.Exception
*/
public ObjectName preRegister(MBeanServer server, ObjectName name)
throws java.lang.Exception {
return name;
}
/**
* Allows the timer MBean to perform any operations needed after having been
* registered in the MBean server or after the registration has failed.
* <P>
* Not used in this context.
*/
public void postRegister (Boolean registrationDone) {
}
/**
* Allows the timer MBean to perform any operations it needs before being unregistered
* by the MBean server.
* <P>
* Stops the timer.
*
* @exception java.lang.Exception
*/
public void preDeregister() throws java.lang.Exception {
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"preDeregister", "stop the timer");
// Stop the timer.
//
stop();
}
/**
* Allows the timer MBean to perform any operations needed after having been
* unregistered by the MBean server.
* <P>
* Not used in this context.
*/
public void postDeregister() {
}
/*
* This overrides the method in NotificationBroadcasterSupport.
* Return the MBeanNotificationInfo[] array for this MBean.
* The returned array has one element to indicate that the MBean
* can emit TimerNotification. The array of type strings
* associated with this entry is a snapshot of the current types
* that were given to addNotification.
*/
public synchronized MBeanNotificationInfo[] getNotificationInfo() {
Set<String> notifTypes = new TreeSet();
for (Object[] entry : timerTable.values()) {
TimerNotification notif = (TimerNotification)
entry[TIMER_NOTIF_INDEX];
notifTypes.add(notif.getType());
}
String[] notifTypesArray =
notifTypes.toArray(new String[0]);
return new MBeanNotificationInfo[] {
new MBeanNotificationInfo(notifTypesArray,
TimerNotification.class.getName(),
"Notification sent by Timer MBean")
};
}
/**
* Starts the timer.
* <P>
* If there is one or more timer notifications before the time in the list of notifications, the notification
* is sent according to the <CODE>sendPastNotifications flag and then, updated
* according to its period and remaining number of occurrences.
* If the timer notification date remains earlier than the current date, this notification is just removed
* from the list of notifications.
*/
public synchronized void start() {
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"start", "starting the timer");
// Start the TimerAlarmClock.
//
if (isActive == false) {
timer = new java.util.Timer();
TimerAlarmClock alarmClock;
Date date;
Date currentDate = new Date();
// Send or not past notifications depending on the flag.
// Update the date and the number of occurrences of past notifications
// to make them later than the current date.
//
sendPastNotifications(currentDate, sendPastNotifications);
// Update and start all the TimerAlarmClocks.
// Here, all the notifications in the timer table are later than the current date.
//
for (Object[] obj : timerTable.values()) {
// Retrieve the date notification and the TimerAlarmClock.
//
date = (Date)obj[TIMER_DATE_INDEX];
// Update all the TimerAlarmClock timeouts and start them.
//
boolean fixedRate = ((Boolean)obj[FIXED_RATE_INDEX]).booleanValue();
if (fixedRate)
{
alarmClock = new TimerAlarmClock(this, date);
obj[ALARM_CLOCK_INDEX] = (Object)alarmClock;
timer.schedule(alarmClock, alarmClock.next);
}
else
{
alarmClock = new TimerAlarmClock(this, (date.getTime() - currentDate.getTime()));
obj[ALARM_CLOCK_INDEX] = (Object)alarmClock;
timer.schedule(alarmClock, alarmClock.timeout);
}
}
// Set the state to ON.
//
isActive = true;
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"start", "timer started");
} else {
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"start", "the timer is already activated");
}
}
/**
* Stops the timer.
*/
public synchronized void stop() {
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"stop", "stopping the timer");
// Stop the TimerAlarmClock.
//
if (isActive == true) {
for (Object[] obj : timerTable.values()) {
// Stop all the TimerAlarmClock.
//
TimerAlarmClock alarmClock = (TimerAlarmClock)obj[ALARM_CLOCK_INDEX];
if (alarmClock != null) {
// alarmClock.interrupt();
// try {
// // Wait until the thread die.
// //
// alarmClock.join();
// } catch (InterruptedException ex) {
// // Ignore...
// }
// // Remove the reference on the TimerAlarmClock.
// //
alarmClock.cancel();
}
}
timer.cancel();
// Set the state to OFF.
//
isActive = false;
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"stop", "timer stopped");
} else {
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"stop", "the timer is already deactivated");
}
}
/**
* Creates a new timer notification with the specified <CODE>type, message
* and <CODE>userData and inserts it into the list of notifications with a given date,
* period and number of occurrences.
* <P>
* If the timer notification to be inserted has a date that is before the current date,
* the method behaves as if the specified date were the current date. <BR>
* For once-off notifications, the notification is delivered immediately. <BR>
* For periodic notifications, the first notification is delivered immediately and the
* subsequent ones are spaced as specified by the period parameter.
* <P>
* Note that once the timer notification has been added into the list of notifications,
* its associated date, period and number of occurrences cannot be updated.
* <P>
* In the case of a periodic notification, the value of parameter <i>fixedRate is used to
* specify the execution scheme, as specified in {@link java.util.Timer}.
*
* @param type The timer notification type.
* @param message The timer notification detailed message.
* @param userData The timer notification user data object.
* @param date The date when the notification occurs.
* @param period The period of the timer notification (in milliseconds).
* @param nbOccurences The total number the timer notification will be emitted.
* @param fixedRate If <code>true and if the notification is periodic, the notification
* is scheduled with a <i>fixed-rate execution scheme. If
* <code>false and if the notification is periodic, the notification
* is scheduled with a <i>fixed-delay execution scheme. Ignored if the
* notification is not periodic.
*
* @return The identifier of the new created timer notification.
*
* @exception java.lang.IllegalArgumentException The date is {@code null} or
* the period or the number of occurrences is negative.
*
* @see #addNotification(String, String, Object, Date, long, long)
*/
// NPCTE fix for bugId 4464388, esc 0, MR, to be added after modification of jmx spec
// public synchronized Integer addNotification(String type, String message, Serializable userData,
// Date date, long period, long nbOccurences)
// end of NPCTE fix for bugId 4464388
public synchronized Integer addNotification(String type, String message, Object userData,
Date date, long period, long nbOccurences, boolean fixedRate)
throws java.lang.IllegalArgumentException {
if (date == null) {
throw new java.lang.IllegalArgumentException("Timer notification date cannot be null.");
}
// Check that all the timer notification attributes are valid.
//
// Invalid timer period value exception:
// Check that the period and the nbOccurences are POSITIVE VALUES.
//
if ((period < 0) || (nbOccurences < 0)) {
throw new java.lang.IllegalArgumentException("Negative values for the periodicity");
}
Date currentDate = new Date();
// Update the date if it is before the current date.
//
if (currentDate.after(date)) {
date.setTime(currentDate.getTime());
if (TIMER_LOGGER.isLoggable(Level.FINER)) {
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"addNotification",
"update timer notification to add with:" +
"\n\tNotification date = " + date);
}
}
// Create and add the timer notification into the timer table.
//
Integer notifID = Integer.valueOf(++counterID);
// The sequenceNumber and the timeStamp attributes are updated
// when the notification is emitted by the timer.
//
TimerNotification notif = new TimerNotification(type, this, 0, 0, message, notifID);
notif.setUserData(userData);
Object[] obj = new Object[6];
TimerAlarmClock alarmClock;
if (fixedRate)
{
alarmClock = new TimerAlarmClock(this, date);
}
else
{
alarmClock = new TimerAlarmClock(this, (date.getTime() - currentDate.getTime()));
}
// Fix bug 00417.B
// The date registered into the timer is a clone from the date parameter.
//
Date d = new Date(date.getTime());
obj[TIMER_NOTIF_INDEX] = (Object)notif;
obj[TIMER_DATE_INDEX] = (Object)d;
obj[TIMER_PERIOD_INDEX] = (Object) period;
obj[TIMER_NB_OCCUR_INDEX] = (Object) nbOccurences;
obj[ALARM_CLOCK_INDEX] = (Object)alarmClock;
obj[FIXED_RATE_INDEX] = Boolean.valueOf(fixedRate);
if (TIMER_LOGGER.isLoggable(Level.FINER)) {
StringBuilder strb = new StringBuilder()
.append("adding timer notification:\n\t")
.append("Notification source = ")
.append(notif.getSource())
.append("\n\tNotification type = ")
.append(notif.getType())
.append("\n\tNotification ID = ")
.append(notifID)
.append("\n\tNotification date = ")
.append(d)
.append("\n\tNotification period = ")
.append(period)
.append("\n\tNotification nb of occurrences = ")
.append(nbOccurences)
.append("\n\tNotification executes at fixed rate = ")
.append(fixedRate);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"addNotification", strb.toString());
}
timerTable.put(notifID, obj);
// Update and start the TimerAlarmClock.
//
if (isActive == true) {
if (fixedRate)
{
timer.schedule(alarmClock, alarmClock.next);
}
else
{
timer.schedule(alarmClock, alarmClock.timeout);
}
}
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"addNotification", "timer notification added");
return notifID;
}
/**
* Creates a new timer notification with the specified <CODE>type, message
* and <CODE>userData and inserts it into the list of notifications with a given date,
* period and number of occurrences.
* <P>
* If the timer notification to be inserted has a date that is before the current date,
* the method behaves as if the specified date were the current date. <BR>
* For once-off notifications, the notification is delivered immediately. <BR>
* For periodic notifications, the first notification is delivered immediately and the
* subsequent ones are spaced as specified by the period parameter.
* <P>
* Note that once the timer notification has been added into the list of notifications,
* its associated date, period and number of occurrences cannot be updated.
* <P>
* In the case of a periodic notification, uses a <i>fixed-delay execution scheme, as specified in
* {@link java.util.Timer}. In order to use a <i>fixed-rate execution scheme, use
* {@link #addNotification(String, String, Object, Date, long, long, boolean)} instead.
*
* @param type The timer notification type.
* @param message The timer notification detailed message.
* @param userData The timer notification user data object.
* @param date The date when the notification occurs.
* @param period The period of the timer notification (in milliseconds).
* @param nbOccurences The total number the timer notification will be emitted.
*
* @return The identifier of the new created timer notification.
*
* @exception java.lang.IllegalArgumentException The date is {@code null} or
* the period or the number of occurrences is negative.
*
* @see #addNotification(String, String, Object, Date, long, long, boolean)
*/
// NPCTE fix for bugId 4464388, esc 0, MR , to be added after modification of jmx spec
// public synchronized Integer addNotification(String type, String message, Serializable userData,
// Date date, long period)
// end of NPCTE fix for bugId 4464388 */
public synchronized Integer addNotification(String type, String message, Object userData,
Date date, long period, long nbOccurences)
throws java.lang.IllegalArgumentException {
return addNotification(type, message, userData, date, period, nbOccurences, false);
}
/**
* Creates a new timer notification with the specified <CODE>type, message
* and <CODE>userData and inserts it into the list of notifications with a given date
* and period and a null number of occurrences.
* <P>
* The timer notification will repeat continuously using the timer period using a <i>fixed-delay
* execution scheme, as specified in {@link java.util.Timer}. In order to use a <i>fixed-rate
* execution scheme, use {@link #addNotification(String, String, Object, Date, long, long,
* boolean)} instead.
* <P>
* If the timer notification to be inserted has a date that is before the current date,
* the method behaves as if the specified date were the current date. The
* first notification is delivered immediately and the subsequent ones are
* spaced as specified by the period parameter.
*
* @param type The timer notification type.
* @param message The timer notification detailed message.
* @param userData The timer notification user data object.
* @param date The date when the notification occurs.
* @param period The period of the timer notification (in milliseconds).
*
* @return The identifier of the new created timer notification.
*
* @exception java.lang.IllegalArgumentException The date is {@code null} or
* the period is negative.
*/
// NPCTE fix for bugId 4464388, esc 0, MR , to be added after modification of jmx spec
// public synchronized Integer addNotification(String type, String message, Serializable userData,
// Date date, long period)
// end of NPCTE fix for bugId 4464388 */
public synchronized Integer addNotification(String type, String message, Object userData,
Date date, long period)
throws java.lang.IllegalArgumentException {
return (addNotification(type, message, userData, date, period, 0));
}
/**
* Creates a new timer notification with the specified <CODE>type, message
* and <CODE>userData and inserts it into the list of notifications with a given date
* and a null period and number of occurrences.
* <P>
* The timer notification will be handled once at the specified date.
* <P>
* If the timer notification to be inserted has a date that is before the current date,
* the method behaves as if the specified date were the current date and the
* notification is delivered immediately.
*
* @param type The timer notification type.
* @param message The timer notification detailed message.
* @param userData The timer notification user data object.
* @param date The date when the notification occurs.
*
* @return The identifier of the new created timer notification.
*
* @exception java.lang.IllegalArgumentException The date is {@code null}.
*/
// NPCTE fix for bugId 4464388, esc 0, MR, to be added after modification of jmx spec
// public synchronized Integer addNotification(String type, String message, Serializable userData, Date date)
// throws java.lang.IllegalArgumentException {
// end of NPCTE fix for bugId 4464388
public synchronized Integer addNotification(String type, String message, Object userData, Date date)
throws java.lang.IllegalArgumentException {
return (addNotification(type, message, userData, date, 0, 0));
}
/**
* Removes the timer notification corresponding to the specified identifier from the list of notifications.
*
* @param id The timer notification identifier.
*
* @exception InstanceNotFoundException The specified identifier does not correspond to any timer notification
* in the list of notifications of this timer MBean.
*/
public synchronized void removeNotification(Integer id) throws InstanceNotFoundException {
// Check that the notification to remove is effectively in the timer table.
//
if (timerTable.containsKey(id) == false) {
throw new InstanceNotFoundException("Timer notification to remove not in the list of notifications");
}
// Stop the TimerAlarmClock.
//
Object[] obj = timerTable.get(id);
TimerAlarmClock alarmClock = (TimerAlarmClock)obj[ALARM_CLOCK_INDEX];
if (alarmClock != null) {
// alarmClock.interrupt();
// try {
// // Wait until the thread die.
// //
// alarmClock.join();
// } catch (InterruptedException e) {
// // Ignore...
// }
// // Remove the reference on the TimerAlarmClock.
// //
alarmClock.cancel();
}
// Remove the timer notification from the timer table.
//
if (TIMER_LOGGER.isLoggable(Level.FINER)) {
StringBuilder strb = new StringBuilder()
.append("removing timer notification:")
.append("\n\tNotification source = ")
.append(((TimerNotification)obj[TIMER_NOTIF_INDEX]).getSource())
.append("\n\tNotification type = ")
.append(((TimerNotification)obj[TIMER_NOTIF_INDEX]).getType())
.append("\n\tNotification ID = ")
.append(((TimerNotification)obj[TIMER_NOTIF_INDEX]).getNotificationID())
.append("\n\tNotification date = ")
.append(obj[TIMER_DATE_INDEX])
.append("\n\tNotification period = ")
.append(obj[TIMER_PERIOD_INDEX])
.append("\n\tNotification nb of occurrences = ")
.append(obj[TIMER_NB_OCCUR_INDEX])
.append("\n\tNotification executes at fixed rate = ")
.append(obj[FIXED_RATE_INDEX]);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"removeNotification", strb.toString());
}
timerTable.remove(id);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"removeNotification", "timer notification removed");
}
/**
* Removes all the timer notifications corresponding to the specified type from the list of notifications.
*
* @param type The timer notification type.
*
* @exception InstanceNotFoundException The specified type does not correspond to any timer notification
* in the list of notifications of this timer MBean.
*/
public synchronized void removeNotifications(String type) throws InstanceNotFoundException {
Vector<Integer> v = getNotificationIDs(type);
if (v.isEmpty())
throw new InstanceNotFoundException("Timer notifications to remove not in the list of notifications");
for (Integer i : v)
removeNotification(i);
}
/**
* Removes all the timer notifications from the list of notifications
* and resets the counter used to update the timer notification identifiers.
*/
public synchronized void removeAllNotifications() {
TimerAlarmClock alarmClock;
for (Object[] obj : timerTable.values()) {
// Stop the TimerAlarmClock.
//
alarmClock = (TimerAlarmClock)obj[ALARM_CLOCK_INDEX];
// if (alarmClock != null) {
// alarmClock.interrupt();
// try {
// // Wait until the thread die.
// //
// alarmClock.join();
// } catch (InterruptedException ex) {
// // Ignore...
// }
// Remove the reference on the TimerAlarmClock.
//
// }
alarmClock.cancel();
}
// Remove all the timer notifications from the timer table.
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"removeAllNotifications", "removing all timer notifications");
timerTable.clear();
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"removeAllNotifications", "all timer notifications removed");
// Reset the counterID.
//
counterID = 0;
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"removeAllNotifications", "timer notification counter ID reset");
}
// GETTERS AND SETTERS
//--------------------
/**
* Gets the number of timer notifications registered into the list of notifications.
*
* @return The number of timer notifications.
*/
public synchronized int getNbNotifications() {
return timerTable.size();
}
/**
* Gets all timer notification identifiers registered into the list of notifications.
*
* @return A vector of <CODE>Integer objects containing all the timer notification identifiers.
* <BR>The vector is empty if there is no timer notification registered for this timer MBean.
*/
public synchronized Vector<Integer> getAllNotificationIDs() {
return new Vector<Integer>(timerTable.keySet());
}
/**
* Gets all the identifiers of timer notifications corresponding to the specified type.
*
* @param type The timer notification type.
*
* @return A vector of <CODE>Integer objects containing all the identifiers of
* timer notifications with the specified <CODE>type.
* <BR>The vector is empty if there is no timer notifications registered for this timer MBean
* with the specified <CODE>type.
*/
public synchronized Vector<Integer> getNotificationIDs(String type) {
String s;
Vector<Integer> v = new Vector();
for (Map.Entry<Integer,Object[]> entry : timerTable.entrySet()) {
Object[] obj = entry.getValue();
s = ((TimerNotification)obj[TIMER_NOTIF_INDEX]).getType();
if ((type == null) ? s == null : type.equals(s))
v.addElement(entry.getKey());
}
return v;
}
// 5089997: return is Vector<Integer> not Vector
/**
* Gets the timer notification type corresponding to the specified identifier.
*
* @param id The timer notification identifier.
*
* @return The timer notification type or null if the identifier is not mapped to any
* timer notification registered for this timer MBean.
*/
public synchronized String getNotificationType(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
return ( ((TimerNotification)obj[TIMER_NOTIF_INDEX]).getType() );
}
return null;
}
/**
* Gets the timer notification detailed message corresponding to the specified identifier.
*
* @param id The timer notification identifier.
*
* @return The timer notification detailed message or null if the identifier is not mapped to any
* timer notification registered for this timer MBean.
*/
public synchronized String getNotificationMessage(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
return ( ((TimerNotification)obj[TIMER_NOTIF_INDEX]).getMessage() );
}
return null;
}
/**
* Gets the timer notification user data object corresponding to the specified identifier.
*
* @param id The timer notification identifier.
*
* @return The timer notification user data object or null if the identifier is not mapped to any
* timer notification registered for this timer MBean.
*/
// NPCTE fix for bugId 4464388, esc 0, MR, 03 sept 2001, to be added after modification of jmx spec
//public Serializable getNotificationUserData(Integer id) {
// end of NPCTE fix for bugId 4464388
public synchronized Object getNotificationUserData(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
return ( ((TimerNotification)obj[TIMER_NOTIF_INDEX]).getUserData() );
}
return null;
}
/**
* Gets a copy of the date associated to a timer notification.
*
* @param id The timer notification identifier.
*
* @return A copy of the date or null if the identifier is not mapped to any
* timer notification registered for this timer MBean.
*/
public synchronized Date getDate(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
Date date = (Date)obj[TIMER_DATE_INDEX];
return (new Date(date.getTime()));
}
return null;
}
/**
* Gets a copy of the period (in milliseconds) associated to a timer notification.
*
* @param id The timer notification identifier.
*
* @return A copy of the period or null if the identifier is not mapped to any
* timer notification registered for this timer MBean.
*/
public synchronized Long getPeriod(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
return (Long)obj[TIMER_PERIOD_INDEX];
}
return null;
}
/**
* Gets a copy of the remaining number of occurrences associated to a timer notification.
*
* @param id The timer notification identifier.
*
* @return A copy of the remaining number of occurrences or null if the identifier is not mapped to any
* timer notification registered for this timer MBean.
*/
public synchronized Long getNbOccurences(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
return (Long)obj[TIMER_NB_OCCUR_INDEX];
}
return null;
}
/**
* Gets a copy of the flag indicating whether a periodic notification is
* executed at <i>fixed-delay or at fixed-rate.
*
* @param id The timer notification identifier.
*
* @return A copy of the flag indicating whether a periodic notification is
* executed at <i>fixed-delay or at fixed-rate.
*/
public synchronized Boolean getFixedRate(Integer id) {
Object[] obj = timerTable.get(id);
if (obj != null) {
Boolean fixedRate = (Boolean)obj[FIXED_RATE_INDEX];
return (Boolean.valueOf(fixedRate.booleanValue()));
}
return null;
}
/**
* Gets the flag indicating whether or not the timer sends past notifications.
* <BR>The default value of the past notifications sending on/off flag is false.
*
* @return The past notifications sending on/off flag value.
*
* @see #setSendPastNotifications
*/
public boolean getSendPastNotifications() {
return sendPastNotifications;
}
/**
* Sets the flag indicating whether the timer sends past notifications or not.
* <BR>The default value of the past notifications sending on/off flag is false.
*
* @param value The past notifications sending on/off flag value.
*
* @see #getSendPastNotifications
*/
public void setSendPastNotifications(boolean value) {
sendPastNotifications = value;
}
/**
* Tests whether the timer MBean is active.
* A timer MBean is marked active when the {@link #start start} method is called.
* It becomes inactive when the {@link #stop stop} method is called.
* <BR>The default value of the active on/off flag is false.
*
* @return <CODE>true if the timer MBean is active, false otherwise.
*/
public boolean isActive() {
return isActive;
}
/**
* Tests whether the list of timer notifications is empty.
*
* @return <CODE>true if the list of timer notifications is empty, false otherwise.
*/
public synchronized boolean isEmpty() {
return (timerTable.isEmpty());
}
/*
* ------------------------------------------
* PRIVATE METHODS
* ------------------------------------------
*/
/**
* Sends or not past notifications depending on the specified flag.
*
* @param currentDate The current date.
* @param currentFlag The flag indicating if past notifications must be sent or not.
*/
private synchronized void sendPastNotifications(Date currentDate, boolean currentFlag) {
TimerNotification notif;
Integer notifID;
Date date;
ArrayList<Object[]> values =
new ArrayList<Object[]>(timerTable.values());
for (Object[] obj : values) {
// Retrieve the timer notification and the date notification.
//
notif = (TimerNotification)obj[TIMER_NOTIF_INDEX];
notifID = notif.getNotificationID();
date = (Date)obj[TIMER_DATE_INDEX];
// Update the timer notification while:
// - the timer notification date is earlier than the current date
// - the timer notification has not been removed from the timer table.
//
while ( (currentDate.after(date)) && (timerTable.containsKey(notifID)) ) {
if (currentFlag == true) {
if (TIMER_LOGGER.isLoggable(Level.FINER)) {
StringBuilder strb = new StringBuilder()
.append("sending past timer notification:")
.append("\n\tNotification source = ")
.append(notif.getSource())
.append("\n\tNotification type = ")
.append(notif.getType())
.append("\n\tNotification ID = ")
.append(notif.getNotificationID())
.append("\n\tNotification date = ")
.append(date)
.append("\n\tNotification period = ")
.append(obj[TIMER_PERIOD_INDEX])
.append("\n\tNotification nb of occurrences = ")
.append(obj[TIMER_NB_OCCUR_INDEX])
.append("\n\tNotification executes at fixed rate = ")
.append(obj[FIXED_RATE_INDEX]);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"sendPastNotifications", strb.toString());
}
sendNotification(date, notif);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"sendPastNotifications", "past timer notification sent");
}
// Update the date and the number of occurrences of the timer notification.
//
updateTimerTable(notif.getNotificationID());
}
}
}
/**
* If the timer notification is not periodic, it is removed from the list of notifications.
* <P>
* If the timer period of the timer notification has a non null periodicity,
* the date of the timer notification is updated by adding the periodicity.
* The associated TimerAlarmClock is updated by setting its timeout to the period value.
* <P>
* If the timer period has a defined number of occurrences, the timer
* notification is updated if the number of occurrences has not yet been reached.
* Otherwise it is removed from the list of notifications.
*
* @param notifID The timer notification identifier to update.
*/
private synchronized void updateTimerTable(Integer notifID) {
// Retrieve the timer notification and the TimerAlarmClock.
//
Object[] obj = timerTable.get(notifID);
Date date = (Date)obj[TIMER_DATE_INDEX];
Long period = (Long)obj[TIMER_PERIOD_INDEX];
Long nbOccurences = (Long)obj[TIMER_NB_OCCUR_INDEX];
Boolean fixedRate = (Boolean)obj[FIXED_RATE_INDEX];
TimerAlarmClock alarmClock = (TimerAlarmClock)obj[ALARM_CLOCK_INDEX];
if (period.longValue() != 0) {
// Update the date and the number of occurrences of the timer notification
// and the TimerAlarmClock time out.
// NOTES :
// nbOccurences = 0 notifies an infinite periodicity.
// nbOccurences = 1 notifies a finite periodicity that has reached its end.
// nbOccurences > 1 notifies a finite periodicity that has not yet reached its end.
//
if ((nbOccurences.longValue() == 0) || (nbOccurences.longValue() > 1)) {
date.setTime(date.getTime() + period.longValue());
obj[TIMER_NB_OCCUR_INDEX] = Long.valueOf(java.lang.Math.max(0L, (nbOccurences.longValue() - 1)));
nbOccurences = (Long)obj[TIMER_NB_OCCUR_INDEX];
if (isActive == true) {
if (fixedRate.booleanValue())
{
alarmClock = new TimerAlarmClock(this, date);
obj[ALARM_CLOCK_INDEX] = (Object)alarmClock;
timer.schedule(alarmClock, alarmClock.next);
}
else
{
alarmClock = new TimerAlarmClock(this, period.longValue());
obj[ALARM_CLOCK_INDEX] = (Object)alarmClock;
timer.schedule(alarmClock, alarmClock.timeout);
}
}
if (TIMER_LOGGER.isLoggable(Level.FINER)) {
TimerNotification notif = (TimerNotification)obj[TIMER_NOTIF_INDEX];
StringBuilder strb = new StringBuilder()
.append("update timer notification with:")
.append("\n\tNotification source = ")
.append(notif.getSource())
.append("\n\tNotification type = ")
.append(notif.getType())
.append("\n\tNotification ID = ")
.append(notifID)
.append("\n\tNotification date = ")
.append(date)
.append("\n\tNotification period = ")
.append(period)
.append("\n\tNotification nb of occurrences = ")
.append(nbOccurences)
.append("\n\tNotification executes at fixed rate = ")
.append(fixedRate);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"updateTimerTable", strb.toString());
}
}
else {
if (alarmClock != null) {
// alarmClock.interrupt();
// try {
// // Wait until the thread die.
// //
// alarmClock.join();
// } catch (InterruptedException e) {
// // Ignore...
// }
alarmClock.cancel();
}
timerTable.remove(notifID);
}
}
else {
if (alarmClock != null) {
// alarmClock.interrupt();
// try {
// // Wait until the thread die.
// //
// alarmClock.join();
// } catch (InterruptedException e) {
// // Ignore...
// }
alarmClock.cancel();
}
timerTable.remove(notifID);
}
}
/*
* ------------------------------------------
* PACKAGE METHODS
* ------------------------------------------
*/
/**
* This method is called by the timer each time
* the TimerAlarmClock has exceeded its timeout.
*
* @param notification The TimerAlarmClock notification.
*/
@SuppressWarnings("deprecation")
void notifyAlarmClock(TimerAlarmClockNotification notification) {
TimerNotification timerNotification = null;
Date timerDate = null;
// Retrieve the timer notification associated to the alarm-clock.
//
TimerAlarmClock alarmClock = (TimerAlarmClock)notification.getSource();
synchronized(Timer.this) {
for (Object[] obj : timerTable.values()) {
if (obj[ALARM_CLOCK_INDEX] == alarmClock) {
timerNotification = (TimerNotification)obj[TIMER_NOTIF_INDEX];
timerDate = (Date)obj[TIMER_DATE_INDEX];
break;
}
}
}
// Notify the timer.
//
sendNotification(timerDate, timerNotification);
// Update the notification and the TimerAlarmClock timeout.
//
updateTimerTable(timerNotification.getNotificationID());
}
/**
* This method is used by the timer MBean to update and send a timer
* notification to all the listeners registered for this kind of notification.
*
* @param timeStamp The notification emission date.
* @param notification The timer notification to send.
*/
void sendNotification(Date timeStamp, TimerNotification notification) {
if (TIMER_LOGGER.isLoggable(Level.FINER)) {
StringBuilder strb = new StringBuilder()
.append("sending timer notification:")
.append("\n\tNotification source = ")
.append(notification.getSource())
.append("\n\tNotification type = ")
.append(notification.getType())
.append("\n\tNotification ID = ")
.append(notification.getNotificationID())
.append("\n\tNotification date = ")
.append(timeStamp);
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"sendNotification", strb.toString());
}
long curSeqNumber;
synchronized(this) {
sequenceNumber = sequenceNumber + 1;
curSeqNumber = sequenceNumber;
}
synchronized (notification) {
notification.setTimeStamp(timeStamp.getTime());
notification.setSequenceNumber(curSeqNumber);
this.sendNotification((TimerNotification)notification.cloneTimerNotification());
}
TIMER_LOGGER.logp(Level.FINER, Timer.class.getName(),
"sendNotification", "timer notification sent");
}
}
Other Java examples (source code examples)
Here is a short list of links related to this Java Timer.java source code file:
|
The search page
Other Java source code examples at this package level
Click here to learn more about this project
