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.ps.storage.partition.storage;
  
  import com.tencent.angel.ml.matrix.psf.update.base.PartitionUpdateParam;
  import com.tencent.angel.ml.matrix.psf.update.base.UpdateFunc;
  import io.netty.buffer.ByteBuf;
  import java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.io.IOException;
  
  /**
   * Base class of server partition storage
   */
  public abstract class ServerPartitionStorage implements IServerPartitionStorage {
    /**
     * Row id offset
     */
    protected volatile int rowIdOffset;
  
    public ServerPartitionStorage(int rowIdOffset) {
      this.rowIdOffset = rowIdOffset;
    }
  
    @Override
    public void serialize(ByteBuf output) {
      output.writeInt(rowIdOffset);
    }
  
    @Override
    public void deserialize(ByteBuf input) {
      rowIdOffset = input.readInt();
    }
  
    @Override
    public int bufferLen() {
      return 4;
    }
  
    @Override
    public void serialize(DataOutputStream output) throws IOException {
      output.writeInt(rowIdOffset);
    }
  
    @Override
    public void deserialize(DataInputStream input) throws IOException {
      rowIdOffset = input.readInt();
    }
  
    @Override
    public int dataLen() {
      return 4;
    }
  
    @Override
    public long dataSize() {
      return 4;
    }
  
    @Override
    public void update(UpdateFunc func, PartitionUpdateParam partParam) {
      func.partitionUpdate(partParam);
    }
  }
  