com.hazelcast.map.impl

Class LatencyTrackingMapLoader<K,V>

java.lang.Object

com.hazelcast.map.impl.LatencyTrackingMapLoader<K,V>

All Implemented Interfaces:

MapLoader<K,V>

public class LatencyTrackingMapLoader<K,V>
extends Object
implements MapLoader<K,V>

Constructor Summary

Constructors

Constructor and Description
LatencyTrackingMapLoader(MapLoader<K,V> delegate, StoreLatencyPlugin plugin, String mapName)

Method Summary

Modifier and Type	Method and Description
V	load(K key) Loads the value of a given key.
Map<K,V>	loadAll(Collection<K> keys) Loads given keys.
Iterable<K>	loadAllKeys() Loads all of the keys from the store.

Methods inherited from class java.lang.Object

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

Constructor Detail

LatencyTrackingMapLoader

public LatencyTrackingMapLoader(MapLoader<K,V> delegate,
                                StoreLatencyPlugin plugin,
                                String mapName)

Method Detail

load

public V load(K key)

Description copied from interface: MapLoader

Loads the value of a given key. If distributed map doesn't contain the value for the given key then Hazelcast will call implementation's load (key) method to obtain the value. Implementation can use any means of loading the given key; such as an O/R mapping tool, simple SQL or reading a file etc.

Specified by:

load in interface MapLoader<K,V>

Returns:

value of the key; returning null value signals value missing in the underlying store

loadAll

public Map<K,V> loadAll(Collection<K> keys)

Description copied from interface: MapLoader

Loads given keys. This is batch load operation so that implementation can optimize the multiple loads.

For any key in the input keys, there should be a single mapping in the resulting map. Also the resulting map should not have any keys that are not part of the input keys.

The given collection should not contain any null keys. The returned Map should not contain any null keys or values.

Loading other items than what provided in keys prevents the map from being filled from the map store.

Specified by:

loadAll in interface MapLoader<K,V>

Parameters:

keys - keys of the values entries to load

Returns:

map of loaded key-value pairs.

loadAllKeys

public Iterable<K> loadAllKeys()

Description copied from interface: MapLoader

Loads all of the keys from the store. The returned Iterable may return the keys lazily by loading them in batches. The Iterator of this Iterable may implement the Closeable interface in which case it will be closed once iteration is over. This is intended for releasing resources such as closing a JDBC result set.

The returned Iterable should not contain any null keys.

Specified by:

loadAllKeys in interface MapLoader<K,V>

Returns:

all the keys. Keys inside the Iterable cannot be null.