An instance of a ZoomTilesSchedulerStrategy rules the desired order at which tiles in a given zoom should be processed (see derived classes for concrete strategies). More...

#include <zoom_tiles_scheduler.h>

Inheritance diagram for ZoomTilesSchedulerStrategy:

Public Member Functions
virtual void	initSchedule (const ctb::TileBounds &zoomBounds)=0

void	initRootSchedule ()

ctb::TilePoint	getNextTile ()
	Get the next tile to process.

int	numTiles ()
	Number of tiles in the schedule.

int	currentIndex ()
	The current index in the schedule.

bool	finished ()
	Marks if the current schedule is finished.

Protected Attributes
int	m_index

std::vector< ctb::TilePoint >	m_tilesToProcess

Detailed Description

An instance of a ZoomTilesSchedulerStrategy rules the desired order at which tiles in a given zoom should be processed (see derived classes for concrete strategies).

Note that the order in this schedule will only be the actual order in which the tiles will be processed when using a single processing thread.

When processing in parallel (numThreads > 1), the schedule will only be a "preferred order", since the tiles that can be processed at a given moment depend on the tiles being processed in the other threads. That is, when a tile is being processed, it prevents all its neighbors in an 8-connected vicinity from start processing. In those cases, the builder will select the closest one in the list of the scheduler that can be executed. Those which could not be executed are put on a waiting list, and they are processed as soon as possible.

While a complete analysis of the implications of the parameters has not been performed, keep in mind that the number of threads used and the preferred order selected will have consequences on both the number of tiles that need to be stored in the cache to maintain already-built borders and the number of processes that can be spawned at a given moment during the execution of the pyramid builder.

Note: this class is the algorithm interphase of an Strategy pattern.

The documentation for this class was generated from the following file:

/mnt/Raid1Ext/EMODNET/Code/src/base/zoom_tiles_scheduler.h

Public Member Functions

Protected Attributes

Detailed Description