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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.PooledByteBufAllocator;
import io.netty.util.internal.PlatformDependent;

import java.lang.reflect.Field;

public class NettyUtils {
  public static PooledByteBufAllocator createPooledByteBufAllocator(boolean allowDirectBufs,
    boolean allowCache, int numCores) {
    if (numCores == 0) {
      numCores = Runtime.getRuntime().availableProcessors();
    }
    return new PooledByteBufAllocator(allowDirectBufs && PlatformDependent.directBufferPreferred(),
      Math.min(getPrivateStaticField("DEFAULT_NUM_HEAP_ARENA"), numCores),
      Math.min(getPrivateStaticField("DEFAULT_NUM_DIRECT_ARENA"), allowDirectBufs ? numCores : 0),
      getPrivateStaticField("DEFAULT_PAGE_SIZE"), getPrivateStaticField("DEFAULT_MAX_ORDER"),
      allowCache ? getPrivateStaticField("DEFAULT_TINY_CACHE_SIZE") : 0,
      allowCache ? getPrivateStaticField("DEFAULT_SMALL_CACHE_SIZE") : 0,
      allowCache ? getPrivateStaticField("DEFAULT_NORMAL_CACHE_SIZE") : 0);
  }

  private static int getPrivateStaticField(String name) {
    try {
      Field f = PooledByteBufAllocator.DEFAULT.getClass().getDeclaredField(name);
      f.setAccessible(true);
      return f.getInt(null);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
}