org.gvsig.remoteclient.taskplanning

Interface IQueue

All Known Implementing Classes:

RetrieveQueue

public interface IQueue

You should write your own concrete Queue implementation to hold the tasks in a specific kind of queue.

Following the contract, you should also write a task planner that does what you desire. Task planners are a concrete class of the ITaskPlanner that would plannify which is the next, the previous,.. task to be done. However, if you don't want to write anything special, just guess a simple FIFO queue

Author:

jaume dominguez faus - jaume.dominguez@iver.es

See Also:

ITaskPlanner

Method Summary

Methods

Modifier and Type	Method and Description
ITaskPlanner	getTaskPlanner() Returns the task planner currently defined by this queue.
java.util.Vector	getTasks() Returns the set of tasks in a Vector (thread-safe).
boolean	isEmpty() Returns true if the Queue has no (more) jobs to do.
void	pause() Causes the execution of this queue to be paused.
IRunnableTask	put(IRunnableTask task) Adds a new task to the queue.
void	resume() Causes the execution of this queue to be resumed.
void	setTaskPlanner(ITaskPlanner planner) Sets the TaskPlanner that will decide which of the tasks in the queue will be executed next.
IRunnableTask	take() Returns the next task by calling the task planner's nextTask() method.

Method Detail

getTaskPlanner

ITaskPlanner getTaskPlanner()

Returns the task planner currently defined by this queue.

Returns:

ITaskPlanner

getTasks

java.util.Vector getTasks()

Returns the set of tasks in a Vector (thread-safe).

Returns:

Vector containing the tasks in this queue.

isEmpty

boolean isEmpty()

Returns true if the Queue has no (more) jobs to do.

Returns:

pause

void pause()

Causes the execution of this queue to be paused. The task currently in execution finishes and after it the planner will not issue more tasks until resume() is invoked.

put

IRunnableTask put(IRunnableTask task)

Adds a new task to the queue. The place where the new task will be put its left to the concrete implementation of this interface.

Parameters:

IRunnableTask - task

resume

void resume()

Causes the execution of this queue to be resumed. The execution will continue with the next task issued by the planner. It has no effect if the queue was not paused yet.

setTaskPlanner

void setTaskPlanner(ITaskPlanner planner)

Sets the TaskPlanner that will decide which of the tasks in the queue will be executed next. A null value should represent a FIFO planner.

Parameters:

planner -

take

IRunnableTask take()

Returns the next task by calling the task planner's nextTask() method.

Returns:

IRunnableTask with the next task to be executed.