content: /*
   * 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 com.esotericsoftware.kryo.Kryo;
  import com.esotericsoftware.kryo.io.Input;
  import com.esotericsoftware.kryo.io.Output;
  import com.tencent.angel.ml.metric.Metric;
  import de.javakaffee.kryoserializers.KryoReflectionFactorySupport;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  
  public class KryoUtils {
    private static ThreadLocal<Kryo> kryos = new ThreadLocal<Kryo>();
    private static ThreadLocal<KryoReflectionFactorySupport> kryoRefs =
      new ThreadLocal<KryoReflectionFactorySupport>();
  
    private static Kryo getKryo() {
      Kryo kryo = kryos.get();
      if (kryo == null) {
        kryo = new Kryo();
        kryos.set(kryo);
      }
  
      return kryo;
    }
  
    private static KryoReflectionFactorySupport getKryoRef() {
      KryoReflectionFactorySupport kryoRef = kryoRefs.get();
      if (kryoRef == null) {
        kryoRef = new KryoReflectionFactorySupport();
        kryoRefs.set(kryoRef);
      }
  
      return kryoRef;
    }
  
    public static byte[] serializeAlgoMetric(Metric value) {
      Kryo kryo = getKryo();
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      Output output = new Output(baos);
      kryo.writeClassAndObject(output, value);
      output.flush();
      output.close();
      return baos.toByteArray();
    }
  
    public static Metric deserializeAlgoMetric(byte[] data) {
      ByteArrayInputStream bais = new ByteArrayInputStream(data);
      Input input = new Input(bais);
      KryoReflectionFactorySupport kryoRef = getKryoRef();
      return ((Metric) kryoRef.readClassAndObject(input));
    }
  }
  