Timer (Java SE 16 & JDK 16) (original) (raw)

All Implemented Interfaces:

[MBeanRegistration](../MBeanRegistration.html "interface in javax.management"), [NotificationBroadcaster](../NotificationBroadcaster.html "interface in javax.management"), [NotificationEmitter](../NotificationEmitter.html "interface in javax.management"), [TimerMBean](TimerMBean.html "interface in javax.management.timer")

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.

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.
Additional timer notifications can be added into regularly repeating notifications.

Note:

  1. When sending timer notifications, the timer updates the notification sequence number irrespective of the notification type.
  2. 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.
  3. The default behavior for periodic notifications is fixed-delay execution, as specified in Timer. In order to use fixed-rate execution, use the overloaded addNotification(String, String, Object, Date, long, long, boolean) method.
  4. 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 NotificationBroadcasterSupport.

Since:

1.5

Fields
static long
Number of milliseconds in one day.
static long
Number of milliseconds in one hour.
static long
Number of milliseconds in one minute.
static long
Number of milliseconds in one second.
static long
Number of milliseconds in one week.

Constructors

Creates a new timer notification with the specified type, message and userData and inserts it into the list of notifications with a given date and a null period and number of occurrences.
Creates a new timer notification with the specified type, message and userData and inserts it into the list of notifications with a given date and period and a null number of occurrences.
Creates a new timer notification with the specified type, message and userData and inserts it into the list of notifications with a given date, period and number of occurrences.
[addNotification](#addNotification%28java.lang.String,java.lang.String,java.lang.Object,java.util.Date,long,long,boolean%29)​([String](../../../../java.base/java/lang/String.html "class in java.lang") type,[String](../../../../java.base/java/lang/String.html "class in java.lang") message,[Object](../../../../java.base/java/lang/Object.html "class in java.lang") userData,[Date](../../../../java.base/java/util/Date.html "class in java.util") date, long period, long nbOccurences, boolean fixedRate)
Creates a new timer notification with the specified type, message and userData and inserts it into the list of notifications with a given date, period and number of occurrences.
Gets all timer notification identifiers registered into the list of notifications.
Gets a copy of the date associated to a timer notification.
Gets a copy of the flag indicating whether a periodic notification is executed at fixed-delay or at fixed-rate.
int
Gets the number of timer notifications registered into the list of notifications.
Gets a copy of the remaining number of occurrences associated to a timer notification.
Gets all the identifiers of timer notifications corresponding to the specified type.
Gets the timer notification detailed message corresponding to the specified identifier.
Gets the timer notification type corresponding to the specified identifier.
Gets the timer notification user data object corresponding to the specified identifier.
Gets a copy of the period (in milliseconds) associated to a timer notification.
boolean
Gets the flag indicating whether or not the timer sends past notifications.
boolean
[isActive](#isActive%28%29)()
Tests whether the timer MBean is active.
boolean
[isEmpty](#isEmpty%28%29)()
Tests whether the list of timer notifications is empty.
void
Allows the timer MBean to perform any operations needed after having been unregistered by the MBean server.
void
Allows the timer MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.
void
Allows the timer MBean to perform any operations it needs before being unregistered by the MBean server.
Allows the timer MBean to perform any operations it needs before being registered in the MBean server.
void
Removes all the timer notifications from the list of notifications and resets the counter used to update the timer notification identifiers.
void
Removes the timer notification corresponding to the specified identifier from the list of notifications.
void
Removes all the timer notifications corresponding to the specified type from the list of notifications.
void
[setSendPastNotifications](#setSendPastNotifications%28boolean%29)​(boolean value)
Sets the flag indicating whether the timer sends past notifications or not.
void
[start](#start%28%29)()
void
[stop](#stop%28%29)()

Methods declared in class java.lang.Object

[clone](../../../../java.base/java/lang/Object.html#clone%28%29), [equals](../../../../java.base/java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../../../java.base/java/lang/Object.html#finalize%28%29), [getClass](../../../../java.base/java/lang/Object.html#getClass%28%29), [hashCode](../../../../java.base/java/lang/Object.html#hashCode%28%29), [notify](../../../../java.base/java/lang/Object.html#notify%28%29), [notifyAll](../../../../java.base/java/lang/Object.html#notifyAll%28%29), [toString](../../../../java.base/java/lang/Object.html#toString%28%29), [wait](../../../../java.base/java/lang/Object.html#wait%28%29), [wait](../../../../java.base/java/lang/Object.html#wait%28long%29), [wait](../../../../java.base/java/lang/Object.html#wait%28long,int%29)