Package com.massifmaps.datasources

Class MemoryCacheTileDataSource

java.lang.Object

com.massifmaps.datasources.TileDataSource

com.massifmaps.datasources.CacheTileDataSource

com.massifmaps.datasources.MemoryCacheTileDataSource

public class MemoryCacheTileDataSource
extends CacheTileDataSource

A tile data source that loads tiles from another tile data source
and caches them in memory. This cache is not persistent, tiles
will be cleared once the application closes. Default cache capacity is 6MB.

Constructor Summary

Constructors

Constructor	Description
MemoryCacheTileDataSource(TileDataSource dataSource)	Constructs a MemoryCacheTileDataSource object from tile data source.

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear the cache.
long	getCapacity()	Returns the tile cache capacity.
TileData	loadTile(MapTile mapTile)	Loads the specified tile. Note: the tile coordinate system used here is vertically flipped relative to layer tile coordinate system.
void	setCapacity(long capacityInBytes)	Sets the cache capacity.

Methods inherited from class com.massifmaps.datasources.CacheTileDataSource

getContainerMetaData, getDataExtent, getDataSource, getMaxZoom, getMinZoom, notifyTilesChanged

Methods inherited from class com.massifmaps.datasources.TileDataSource

buildTagValues, containsMetaDataKey, getMaxOverzoomLevel, getMaxZoomWithOverzoom, getMetaData, getMetaDataElement, getProjection, isMaxOverzoomLevelSet, setMaxOverzoomLevel, setMetaData, setMetaDataElement

Methods inherited from class java.lang.Object

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

Constructor Details

MemoryCacheTileDataSource

public MemoryCacheTileDataSource(TileDataSource dataSource)

Constructs a MemoryCacheTileDataSource object from tile data source.

Parameters:

dataSource - The datasource to be cached.

Method Details

loadTile

public TileData loadTile(MapTile mapTile)

Description copied from class: TileDataSource

Loads the specified tile.
Note: the tile coordinate system used here is vertically flipped relative to layer tile coordinate system.

Overrides:

loadTile in class TileDataSource

Parameters:

mapTile - The tile to load.

Returns:

The tile data. If the tile is not available, null may be returned.

clear

public void clear()

Description copied from class: CacheTileDataSource

Clear the cache.

Overrides:

clear in class CacheTileDataSource

getCapacity

public long getCapacity()

Description copied from class: CacheTileDataSource

Returns the tile cache capacity.

Overrides:

getCapacity in class CacheTileDataSource

Returns:

The tile cache capacity in bytes.

setCapacity

public void setCapacity(long capacityInBytes)

Description copied from class: CacheTileDataSource

Sets the cache capacity.

Overrides:

setCapacity in class CacheTileDataSource

Parameters:

capacityInBytes - The new tile cache capacity in bytes.