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/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * 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
 *
 * https://opensource.org/licenses/Apache-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 com.tencent.angel.utils;

import io.netty.buffer.*;

/**
 * Netty ByteBuf allocation utils.
 */
public class ByteBufUtils {
  private static volatile ByteBufAllocator allocator = null;
  public static volatile boolean useDirect = true;
  public static volatile boolean usePool = true;

  private static ByteBufAllocator getBufferAllocator() {
    if (allocator == null) {
      if (usePool) {
        allocator = new PooledByteBufAllocator();
      } else {
        allocator = new UnpooledByteBufAllocator(true);
      }
    }
    return allocator;
  }

  public static ByteBuf newHeapByteBuf(int estimizeSerilizeSize) {
    return getBufferAllocator().heapBuffer(estimizeSerilizeSize);
  }

  public static ByteBuf newDirectByteBuf(int estimizeSerilizeSize) {
    return getBufferAllocator().directBuffer(estimizeSerilizeSize);
  }

  public static ByteBuf newByteBuf(int estimizeSerilizeSize, boolean useDirect) {
    if (useDirect) {
      return newDirectByteBuf(estimizeSerilizeSize);
    } else {
      return newHeapByteBuf(estimizeSerilizeSize);
    }
  }

  public static ByteBuf newByteBuf(int estimizeSerilizeSize) {
    if (useDirect) {
      return newDirectByteBuf(estimizeSerilizeSize);
    } else {
      return newHeapByteBuf(estimizeSerilizeSize);
    }
  }
}