Package org.geotools.swing

Interface RenderingExecutor

All Known Implementing Classes:

DefaultRenderingExecutor

public interface RenderingExecutor

Defines the core methods for executors used to run drawing tasks on background threads.

Since:

8.0

Author:

Michael Bedward

Field Summary

Fields

Modifier and Type	Field	Description
static final long	TASK_REJECTED	Value returned by the submit(org.geotools.map.MapContent, org.geotools.renderer.GTRenderer, java.awt.Graphics2D, org.geotools.swing.RenderingExecutorListener) method if a task is rejected by the executor.

Method Summary

Modifier and Type	Method	Description
void	cancel(long taskId)	Cancels a specific rendering task.
void	cancelAll()
long	getPollingInterval()	Get the interval for polling the result of a rendering task
boolean	isShutdown()	Checks whether shutdown() has been called.
void	setPollingInterval(long interval)	Set the interval for polling the result of a rendering task
void	shutdown()	Stops any current rendering tasks and cleans up resources.
long	submit(MapContent mapContent, List<RenderingOperands> operands, RenderingExecutorListener listener)	Submits a new rendering task to the executor.
long	submit(MapContent mapContent, GTRenderer renderer, Graphics2D graphics, RenderingExecutorListener listener)	Submits a new rendering task to the executor.

Field Details

TASK_REJECTED

static final long TASK_REJECTED

Value returned by the submit(org.geotools.map.MapContent, org.geotools.renderer.GTRenderer, java.awt.Graphics2D, org.geotools.swing.RenderingExecutorListener) method if a task is rejected by the executor.

See Also:

• Constant Field Values

Method Details

getPollingInterval

long getPollingInterval()

Get the interval for polling the result of a rendering task

Returns:

polling interval in milliseconds

setPollingInterval

void setPollingInterval(long interval)

Set the interval for polling the result of a rendering task

Parameters:

interval - interval in milliseconds (values <= 0 are ignored)

submit

long submit(MapContent mapContent,
 GTRenderer renderer,
 Graphics2D graphics,
 RenderingExecutorListener listener)

Submits a new rendering task to the executor. The specified listener will be notified of task progress. If the task is rejected by the executor for any reason, this method returns TASK_REJECTED instead of a task ID value.

Parameters:

mapContent - the map content holding the layers to be rendered

renderer - the renderer to use

graphics - the graphics object to draw into

listener - the listener to be notified of task progress

Returns:

either a task ID value (which should be positive and unique across all executors and rendering tasks) if the task was accepted; or TASK_REJECTED

Throws:

IllegalArgumentException - if any arguments are null

IllegalStateException - if called after the executor has been shut down

submit

long submit(MapContent mapContent,
 List<RenderingOperands> operands,
 RenderingExecutorListener listener)

Submits a new rendering task to the executor. The specified listener will be notified of task progress. If the task is rejected by the executor for any reason, this method returns TASK_REJECTED instead of a task ID value.

Parameters:

mapContent - the map content holding the layers to be rendered

operands - operands for each of the sub-tasks composing this task

listener - the listener to be notified of task progress

Returns:

either a task ID value (which should be positive and unique across all executors and rendering tasks) if the task was accepted; or TASK_REJECTED

Throws:

IllegalArgumentException - if any arguments are null

IllegalStateException - if called after the executor has been shut down

cancel

void cancel(long taskId)

Cancels a specific rendering task.

Parameters:

taskId - the ID value of the task

cancelAll

void cancelAll()

shutdown

void shutdown()

Stops any current rendering tasks and cleans up resources. After calling this method the executor is no longer usable.

isShutdown

boolean isShutdown()

Checks whether shutdown() has been called.

Returns:

true if the executor has been shut down