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.ml.matrix.psf.update.enhance;
  
  import com.tencent.angel.PartitionKey;
  import com.tencent.angel.ml.matrix.psf.Utils;
  import com.tencent.angel.ml.matrix.psf.update.base.PartitionUpdateParam;
  import com.tencent.angel.ml.matrix.psf.update.base.UpdateParam;
  import com.tencent.angel.psagent.PSAgentContext;
  import io.netty.buffer.ByteBuf;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * `MMUpdateParam` is Parameter class for `MMUpdateFunc`
   */
  public class MMUpdateParam extends UpdateParam {
  
    private final int[] rowIds;
    private final double[] scalars;
  
    public MMUpdateParam(int matrixId, int[] rowIds, double[] scalars) {
      super(matrixId, false);
      this.rowIds = rowIds;
      this.scalars = scalars;
    }
  
    public MMUpdateParam(int matrixId, int startId, int length, double[] scalars) {
      super(matrixId, false);
      this.rowIds = getRowIds(startId, length);
      this.scalars = scalars;
    }
  
    private int[] getRowIds(int startId, int length) {
      int[] rowIds = new int[length];
      for (int i = 0; i < length; i++) {
        rowIds[i] = startId + i;
      }
      return rowIds;
    }
  
    @Override public List<PartitionUpdateParam> split() {
      List<PartitionKey> parts = PSAgentContext.get().getMatrixMetaManager().getPartitions(matrixId);
      int size = parts.size();
      List<PartitionUpdateParam> partParams = new ArrayList<PartitionUpdateParam>(size);
      for (PartitionKey part : parts) {
        if (Utils.withinPart(part, rowIds)) {
          partParams.add(new MMPartitionUpdateParam(matrixId, part, rowIds, scalars));
        }
      }
  
      if (partParams.isEmpty()) {
        System.out.println("Rows must in same partition.");
      }
  
      return partParams;
    }
  
    public static class MMPartitionUpdateParam extends PartitionUpdateParam {
      private int[] rowIds;
      private double[] scalars;
  
      public MMPartitionUpdateParam(int matrixId, PartitionKey partKey, int[] rowIds,
        double[] scalars) {
        super(matrixId, partKey, false);
        this.rowIds = rowIds;
        this.scalars = scalars;
      }
  
      public MMPartitionUpdateParam() {
        super();
      }
  
      @Override public void serialize(ByteBuf buf) {
        super.serialize(buf);
        buf.writeInt(rowIds.length);
        for (int rowId : rowIds) {
          buf.writeInt(rowId);
        }
        buf.writeInt(scalars.length);
        for (double scalar : scalars) {
          buf.writeDouble(scalar);
        }
      }
  
      @Override public void deserialize(ByteBuf buf) {
        super.deserialize(buf);
        int rowLength = buf.readInt();
        this.rowIds = new int[rowLength];
        for (int i = 0; i < rowLength; i++) {
          this.rowIds[i] = buf.readInt();
        }
  
        int scalarLength = buf.readInt();
        this.scalars = new double[scalarLength];
        for (int i = 0; i < scalarLength; i++) {
          this.scalars[i] = buf.readDouble();
        }
      }
  
      @Override public int bufferLen() {
        return super.bufferLen() + (4 + 4 * rowIds.length) + (4 + 8 * scalars.length);
      }
  
      public int[] getRowIds() {
        return rowIds;
      }
  
      public double[] getScalars() {
        return scalars;
      }
  
      @Override public String toString() {
        return "MMPartitionUpdateParam [rowIds=" + Arrays.toString(rowIds) + ", scalars=" + Arrays
          .toString(rowIds) + ", toString()=" + super.toString() + "]";
      }
    }
  
  }
  