Package com.here.platform.data.client.v2.caching.javadsl.versioned

Class HierarchicalHereTileMetadataFetchPolicy

java.lang.Object

com.here.platform.data.client.v2.caching.javadsl.versioned.HierarchicalHereTileMetadataFetchPolicy

All Implemented Interfaces:

MetadataFetchPolicy<HereTileKey>

public class HierarchicalHereTileMetadataFetchPolicy
extends Object
implements MetadataFetchPolicy<HereTileKey>

The HierarchicalVersionedLayerMetadataLoader prefetches partitions looking up into the Here Tile hierarchy to fetch the tiles around a given tile.

Constructor Summary

Constructors

Constructor	Description
HierarchicalHereTileMetadataFetchPolicy()	HierarchicalHereTileMetadataFetchPolicy default constructor.
HierarchicalHereTileMetadataFetchPolicy(int numLevels)	HierarchicalHereTileMetadataFetchPolicy constructor.

Method Summary

Modifier and Type	Method	Description
Iterable<HereTileKey>	apply(HereTileKey key)	MetadataFetchPolicy defines which additional partition keys are fetched when requesting a partition key.

Methods inherited from class java.lang.Object

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

Constructor Details

HierarchicalHereTileMetadataFetchPolicy

public HierarchicalHereTileMetadataFetchPolicy(int numLevels)

HierarchicalHereTileMetadataFetchPolicy constructor.

Parameters:

numLevels - numbers of levels to go up in the hierarchy. The loader will fetch 4**n tiles around the given one. numLevels should not be greater than 3.

HierarchicalHereTileMetadataFetchPolicy

public HierarchicalHereTileMetadataFetchPolicy()

HierarchicalHereTileMetadataFetchPolicy default constructor.

Method Details

apply

public Iterable<HereTileKey> apply(HereTileKey key)

Description copied from interface: MetadataFetchPolicy

MetadataFetchPolicy defines which additional partition keys are fetched when requesting a partition key.

Specified by:

apply in interface MetadataFetchPolicy<HereTileKey>

Parameters:

key - Partition key.

Returns:

an Iterable over the partition keys to fetch.