ca.eandb.jdcp.server.scheduling

Class PrioritySerialTaskScheduler

java.lang.Object

ca.eandb.jdcp.server.scheduling.PrioritySerialTaskScheduler

All Implemented Interfaces:

TaskScheduler

public final class PrioritySerialTaskScheduler
extends Object
implements TaskScheduler

A TaskScheduler that serves tasks for the earliest scheduled job having the highest priority in a round robin fashion. That is, tasks are scheduled so that each job completes before the next one starts.

Author:

Brad Kimmel

Constructor Summary

Constructors

Constructor and Description
PrioritySerialTaskScheduler()

Method Summary

Modifier and Type	Method and Description
void	add(TaskDescription task) Adds a task to be scheduled.
boolean	contains(UUID jobId, int taskId) Determines if the specified task exists.
TaskDescription	get(UUID jobId, int taskId) Retrieves the specified task.
TaskDescription	getNextTask() Gets the next task to be served.
TaskDescription	remove(UUID jobId, int taskId) Removes a task from the schedule.
void	removeJob(UUID jobId) Removes all tasks from the schedule that are associated with the specified job.
void	setJobPriority(UUID jobId, int priority) Sets the priority of a job.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PrioritySerialTaskScheduler

public PrioritySerialTaskScheduler()

Method Detail

add

public void add(TaskDescription task)

Description copied from interface: TaskScheduler

Adds a task to be scheduled.

Specified by:

add in interface TaskScheduler

Parameters:

task - An TaskDescription describing the task to be performed.

get

public TaskDescription get(UUID jobId,
                           int taskId)

Description copied from interface: TaskScheduler

Retrieves the specified task.

Specified by:

get in interface TaskScheduler

Parameters:

jobId - The UUID identifying the job associated with the task to retrieve.

taskId - The identifier for the task to be retrieved.

Returns:

The TaskDescription describing the specified task, or null if no such task exists.

contains

public boolean contains(UUID jobId,
                        int taskId)

Description copied from interface: TaskScheduler

Determines if the specified task exists.

Specified by:

contains in interface TaskScheduler

Parameters:

jobId - The UUID identifying the job associated with the task to retrieve.

taskId - The identifier for the task to be retrieved.

Returns:

A value indicating if the specified task exists.

getNextTask

public TaskDescription getNextTask()

Description copied from interface: TaskScheduler

Gets the next task to be served.

Specified by:

getNextTask in interface TaskScheduler

Returns:

A TaskDescription describing the next task to be served.

See Also:

TaskDescription

remove

public TaskDescription remove(UUID jobId,
                              int taskId)

Description copied from interface: TaskScheduler

Removes a task from the schedule.

Specified by:

remove in interface TaskScheduler

Parameters:

jobId - The UUID identifying the job associated with the task to be removed.

taskId - The identifier for the task to be removed.

Returns:

The TaskDescription describing the specified task.

setJobPriority

public void setJobPriority(UUID jobId,
                           int priority)

Description copied from interface: TaskScheduler

Sets the priority of a job. The job priority is a hint to the scheduler which it may use to determine the order in which tasks are served.

Specified by:

setJobPriority in interface TaskScheduler

Parameters:

jobId - The UUID identifying the job for which to set the priority.

priority - The priority to set for the specified job.

removeJob

public void removeJob(UUID jobId)

Description copied from interface: TaskScheduler

Removes all tasks from the schedule that are associated with the specified job.

Specified by:

removeJob in interface TaskScheduler

Parameters:

jobId - The UUID identifying the job for which all tasks are to be removed.