com.tencent.angel.spark.examples.pof.MulScalar Maven / Gradle / Ivy

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/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (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/BSD-3-Clause
 *
 * 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.
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package com.tencent.angel.spark.examples.pof;

import com.tencent.angel.ml.matrix.psf.update.enhance.map.MapFunc;
import io.netty.buffer.ByteBuf;

public class MulScalar implements MapFunc {

  private double multiplier;

  public MulScalar(double multiplier) {
    this.multiplier = multiplier;
  }

  public MulScalar() {
  }

  @Override
  public double call(double value) {
    return value * multiplier;
  }

  @Override
  public void serialize(ByteBuf buf) {
    buf.writeDouble(multiplier);
  }

  @Override
  public void deserialize(ByteBuf buf) {
    multiplier = buf.readDouble();
  }

  @Override
  public int bufferLen() {
    return 8;
  }

}