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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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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.net;

import java.nio.ByteBuffer;

import io.netty.channel.EventLoop;
import org.apache.cassandra.utils.memory.BufferPool;
import org.apache.cassandra.utils.memory.BufferPools;

/**
 * Equivalent to {@link GlobalBufferPoolAllocator}, except explicitly using a specified
 * {@link org.apache.cassandra.utils.memory.BufferPool.LocalPool} to allocate from.
 *
 * Exists to facilitate more efficient handling large messages on the inbound path,
 * used by {@link ConnectionType#LARGE_MESSAGES} connections.
 */
class LocalBufferPoolAllocator extends BufferPoolAllocator
{
    private final BufferPool.LocalPool pool;
    private final EventLoop eventLoop;

    LocalBufferPoolAllocator(EventLoop eventLoop)
    {
        this.pool = BufferPools.forNetworking().create().recycleWhenFree(false);
        this.eventLoop = eventLoop;
    }

    @Override
    ByteBuffer get(int size)
    {
        if (!eventLoop.inEventLoop())
            throw new IllegalStateException("get() called from outside of owning event loop");
        return pool.get(size);
    }

    @Override
    ByteBuffer getAtLeast(int size)
    {
        if (!eventLoop.inEventLoop())
            throw new IllegalStateException("getAtLeast() called from outside of owning event loop");
        return pool.getAtLeast(size);
    }

    @Override
    public void release()
    {
        pool.release();
    }
}