GeoJS

Class: tileCache

geo. tileCache

new geo.tileCache(options)

tileCache.js, line 13

This class implements a simple cache for tile objects. Each tile is stored in cache object keyed by a configurable hashing function. Another array keeps track of last access times for each tile to purge old tiles once the maximum cache size is reached.

Name Type Description
options object optional

A configuration object for the cache.

Name Type Default Description
size number 64 optional

The maximum number of tiles to store.

Members

length

Get the current cache size. Read only.

Properties:
Name Type Description
length number

The current cache size.

size

Get/set the maximum cache size.

Properties:
Name Type Description
size number

The maximum cache size.

Methods

add(tile, removeFunc, noPurge)

tileCache.js, line 117

Add a tile to the cache.

Name Type Description
tile geo.tile

The tile to add.
removeFunc function

If specified and tiles must be purged from the cache, call this function on each tile before purging.
noPurge boolean

if true, don't purge tiles.

clear(){this}

tileCache.js, line 81

Remove all tiles from the cache.

Returns:
Type Description
this

get(hash, noMove){geo.tile|null}

tileCache.js, line 96

Get a tile from the cache if it exists, otherwise return null. This method also moves the tile to the front of the access queue.

Name Type Description
hash string | geo.tile

The tile or the tile hash value.
noMove boolean optional

If truthy, don't move the tile to the front of the access queue.
Returns:
Type Description
geo.tile | null

purge(removeFunc)

tileCache.js, line 137

Purge tiles from the cache if it is full.

Name Type Description
removeFunc function

If specified and tiles must be purged from the cache, call this function on each tile before purging.

remove(tile){boolean}

tileCache.js, line 60

Remove a tile from the cache.

Name Type Description
tile string | geo.tile

The tile or its hash.
Returns:
Type Description
boolean true if a tile was removed.