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Palantir open source project

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/*
 * 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;

import java.nio.ByteBuffer;

import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.BufferDecoratedKey;
import org.apache.cassandra.db.Cell;
import org.apache.cassandra.db.CounterCell;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.DeletedCell;
import org.apache.cassandra.db.ExpiringCell;
import org.apache.cassandra.utils.concurrent.OpOrder;

public abstract class MemtableBufferAllocator extends MemtableAllocator
{

    protected MemtableBufferAllocator(SubAllocator onHeap, SubAllocator offHeap)
    {
        super(onHeap, offHeap);
    }

    public Cell clone(Cell cell, CFMetaData cfm, OpOrder.Group writeOp)
    {
        return cell.localCopy(cfm, allocator(writeOp));
    }

    public CounterCell clone(CounterCell cell, CFMetaData cfm, OpOrder.Group writeOp)
    {
        return cell.localCopy(cfm, allocator(writeOp));
    }

    public DeletedCell clone(DeletedCell cell, CFMetaData cfm, OpOrder.Group writeOp)
    {
        return cell.localCopy(cfm, allocator(writeOp));
    }

    public ExpiringCell clone(ExpiringCell cell, CFMetaData cfm, OpOrder.Group writeOp)
    {
        return cell.localCopy(cfm, allocator(writeOp));
    }

    public DecoratedKey clone(DecoratedKey key, OpOrder.Group writeOp)
    {
        return new BufferDecoratedKey(key.getToken(), allocator(writeOp).clone(key.getKey()));
    }

    public abstract ByteBuffer allocate(int size, OpOrder.Group opGroup);

    protected AbstractAllocator allocator(OpOrder.Group writeOp)
    {
        return new ContextAllocator(writeOp, this);
    }
}