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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.hadoop.hive.llap.cache;

import java.util.List;

import org.apache.hadoop.hive.common.io.Allocator;
import org.apache.hadoop.hive.common.io.encoded.MemoryBuffer;

/**
 * The buffer usage (refcount) tracker. Buffer usage can either be tracked by a cache, which
 * will handle the coordination with eviction, or by a simple refcount manager to facilitate
 * sharing when the buffer contains data for multiple readers.
 */
public interface BufferUsageManager {
  Allocator getAllocator();

  void decRefBuffer(MemoryBuffer buffer);

  void decRefBuffers(List buffers);

  boolean incRefBuffer(MemoryBuffer buffer);
}