Class TaskManager

public class TaskManager implements Runnable
{
  // Constructors
  public TaskManager(ThreadGroup threadGroup);
  public TaskManager(ThreadGroup threadGroup,
        boolean runTasksAsDaemons);

  // Methods
  public synchronized boolean cancel(int id);
  public static TaskManager global();
  public void run();
  public int schedule(Runnable runnable);
  public int schedule(Runnable runnable, long when);
  public synchronized int schedule(Runnable runnable, long when,
        boolean lightweight);
}

This class schedules or manages the execution of runnable objects.

Constructors

TaskManager

public TaskManager(ThreadGroup threadGroup);

Constructs a new TaskManager object.

Parameter	Description
threadGroup	The thread group that the task manager creates threads in.

TaskManager

public TaskManager(ThreadGroup threadGroup, boolean runTasksAsDaemons);

Constructs a new TaskManager object.

Parameter	Description
threadGroup	The thread group that the task manager creates threads in.
runTasksAsDaemons	Set to true if the tasks in this task manager are to run on daemon threads; otherwise, set to false.

Methods

cancel

public synchronized boolean cancel(int id);

Cancels a pending runnable object.

Return Value:

Returns true if the runnable object was cancelled successfully; returns false if the task was already run or had never been scheduled.

Parameter	Description
id	An integer that identifies the task.

global

public static TaskManager global();

Retrieves the global task manager.

Return Value:

Returns the global TaskManager object.

run

public void run();

Called when the thread is started.

Return Value:

No return value.

schedule

public int schedule(Runnable runnable);

Schedules a runnable object to run immediately.

Return Value:

Returns a non-zero integer that identifies the task.

Parameter	Description
runnable	The object that is run.

schedule

public int schedule(Runnable runnable, long when);

Schedules a runnable object to run at a specified time.

Return Value:

Returns a non-zero integer that identifies the task.

Parameter	Description
runnable	The object that is run.
long	The time at which the object is to start.

schedule

public synchronized int schedule(Runnable runnable, long when,
        boolean lightweight);

Schedules a runnable object to run at a specified time.

Return Value:

Returns a non-zero integer that identifies the task.

Parameter	Description
runnable	The object that is run.
when	The time at which the object is run.
lightweight	Set to true to run the task as a lightweight task.