org.terracotta.offheapstore.concurrent.ConcurrentOffHeapHashMap Maven / Gradle / Ivy
Show all versions of offheap-store Show documentation
/*
* Copyright 2015 Terracotta, Inc., a Software AG company.
*
* 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 org.terracotta.offheapstore.concurrent;
import org.terracotta.offheapstore.ReadWriteLockedOffHeapHashMap;
import org.terracotta.offheapstore.paging.PageSource;
import org.terracotta.offheapstore.storage.StorageEngine;
import org.terracotta.offheapstore.util.Factory;
/**
* A striped concurrent-read/exclusive-write map.
*
* This implementation uses instances of {@link ReadWriteLockedOffHeapHashMap}
* for its segments.
*
* @param the type of keys maintained by this map
* @param the type of mapped values
*
* @author Chris Dennis
* @see ReadWriteLockedOffHeapHashMap
*/
public class ConcurrentOffHeapHashMap extends AbstractConcurrentOffHeapMap {
/**
* Creates a map using the given table buffer source and storage engine
* factory.
*
* @param tableSource buffer source from which hash tables are allocated
* @param storageEngineFactory factory for the segment storage engines
*/
public ConcurrentOffHeapHashMap(PageSource tableSource, Factory extends StorageEngine super K, ? super V>> storageEngineFactory) {
super(new ReadWriteLockedOffHeapHashMapFactory<>(tableSource, storageEngineFactory));
}
public ConcurrentOffHeapHashMap(PageSource tableSource, boolean tableAllocationsSteal, Factory extends StorageEngine super K, ? super V>> storageEngineFactory) {
super(new ReadWriteLockedOffHeapHashMapFactory<>(tableSource, tableAllocationsSteal, storageEngineFactory));
}
/**
* Creates a map using the given table buffer source, storage engine
* factory, initial table size, and concurrency.
*
* @param tableSource buffer source from which hash tables are allocated
* @param storageEngineFactory factory for the segment storage engines
* @param tableSize initial table size (summed across all segments)
* @param concurrency number of segments
*/
public ConcurrentOffHeapHashMap(PageSource tableSource, Factory extends StorageEngine super K, ? super V>> storageEngineFactory, long tableSize,
int concurrency) {
super(new ReadWriteLockedOffHeapHashMapFactory<>(tableSource, storageEngineFactory, (int) (tableSize / concurrency)), concurrency);
}
public ConcurrentOffHeapHashMap(PageSource tableSource, boolean tableAllocationsSteal, Factory extends StorageEngine super K, ? super V>> storageEngineFactory, long tableSize,
int concurrency) {
super(new ReadWriteLockedOffHeapHashMapFactory<>(tableSource, tableAllocationsSteal, storageEngineFactory, (int) (tableSize / concurrency)), concurrency);
}
}