src/java/org/apache/cassandra/utils/memory/SlabPool.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.cassandra.utils.memory;

public class SlabPool extends MemtablePool
{
    final boolean allocateOnHeap;

    public SlabPool(long maxOnHeapMemory, long maxOffHeapMemory, float cleanupThreshold, Runnable cleaner)
    {
        super(maxOnHeapMemory, maxOffHeapMemory, cleanupThreshold, cleaner);
        this.allocateOnHeap = maxOffHeapMemory == 0;
    }

    public MemtableAllocator newAllocator()
    {
        return new SlabAllocator(onHeap.newAllocator(), offHeap.newAllocator(), allocateOnHeap);
    }

    public boolean needToCopyOnHeap()
    {
        return !allocateOnHeap;
    }
}