/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.map.impl.mapstore;
import com.hazelcast.config.MapStoreConfig;
import com.hazelcast.map.impl.MapServiceContext;
import com.hazelcast.map.impl.MapStoreWrapper;
import com.hazelcast.map.impl.mapstore.writebehind.WriteBehindProcessor;
import com.hazelcast.map.impl.mapstore.writebehind.WriteBehindQueue;
import com.hazelcast.map.impl.mapstore.writebehind.WriteBehindStore;
import com.hazelcast.map.impl.mapstore.writethrough.WriteThroughStore;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.properties.GroupProperty;
import com.hazelcast.spi.properties.HazelcastProperties;
import com.hazelcast.spi.serialization.SerializationService;
import java.util.concurrent.atomic.AtomicInteger;
import static com.hazelcast.map.impl.mapstore.writebehind.WriteBehindQueues.createBoundedWriteBehindQueue;
import static com.hazelcast.map.impl.mapstore.writebehind.WriteBehindQueues.createDefaultWriteBehindQueue;
/**
* Factory class responsible for creating various data store implementations.
*
* @see com.hazelcast.map.impl.mapstore.MapDataStore
*/
public final class MapDataStores {
public static final MapDataStore EMPTY_MAP_DATA_STORE = new EmptyMapDataStore();
private MapDataStores() {
}
/**
* Creates a write behind data store.
*
* @param mapStoreContext context for map store operations.
* @param partitionId partition id of partition.
* @param writeBehindProcessor the {@link WriteBehindProcessor}
* @param <K> type of key to store.
* @param <V> type of value to store.
* @return new write behind store manager.
*/
public static <K, V> MapDataStore<K, V> createWriteBehindStore(MapStoreContext mapStoreContext, int partitionId,
WriteBehindProcessor writeBehindProcessor) {
MapServiceContext mapServiceContext = mapStoreContext.getMapServiceContext();
MapStoreConfig mapStoreConfig = mapStoreContext.getMapStoreConfig();
WriteBehindStore mapDataStore = new WriteBehindStore(mapStoreContext, partitionId);
mapDataStore.setWriteBehindQueue(newWriteBehindQueue(mapServiceContext, mapStoreConfig.isWriteCoalescing()));
mapDataStore.setWriteBehindProcessor(writeBehindProcessor);
return (MapDataStore<K, V>) mapDataStore;
}
private static WriteBehindQueue newWriteBehindQueue(MapServiceContext mapServiceContext, boolean writeCoalescing) {
HazelcastProperties hazelcastProperties = mapServiceContext.getNodeEngine().getProperties();
final int capacity = hazelcastProperties.getInteger(GroupProperty.MAP_WRITE_BEHIND_QUEUE_CAPACITY);
final AtomicInteger counter = mapServiceContext.getWriteBehindQueueItemCounter();
return (writeCoalescing ? createDefaultWriteBehindQueue() : createBoundedWriteBehindQueue(capacity, counter));
}
/**
* Creates a write through data store.
*
* @param mapStoreContext context for map store operations.
* @param <K> type of key to store.
* @param <V> type of value to store.
* @return new write through store manager.
*/
public static <K, V> MapDataStore<K, V> createWriteThroughStore(MapStoreContext mapStoreContext) {
final MapStoreWrapper store = mapStoreContext.getMapStoreWrapper();
final MapServiceContext mapServiceContext = mapStoreContext.getMapServiceContext();
final NodeEngine nodeEngine = mapServiceContext.getNodeEngine();
final SerializationService serializationService = nodeEngine.getSerializationService();
return (MapDataStore<K, V>) new WriteThroughStore(store, serializationService);
}
/**
* Used for providing neutral null behaviour.
*
* @param <K> type of key to store.
* @param <V> type of value to store.
* @return empty store manager.
*/
public static <K, V> MapDataStore<K, V> emptyStore() {
return (MapDataStore<K, V>) EMPTY_MAP_DATA_STORE;
}
}