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.graph.client.psf.sample.samplenodefeats;
  
  import com.tencent.angel.graph.client.psf.sample.SampleUtils;
  import com.tencent.angel.graph.utils.GraphMatrixUtils;
  import com.tencent.angel.ml.math2.vector.IntFloatVector;
  import com.tencent.angel.ml.matrix.psf.get.base.GetFunc;
  import com.tencent.angel.ml.matrix.psf.get.base.GetResult;
  import com.tencent.angel.ml.matrix.psf.get.base.PartitionGetParam;
  import com.tencent.angel.ml.matrix.psf.get.base.PartitionGetResult;
  import com.tencent.angel.ps.storage.vector.ServerLongAnyRow;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  public class SampleNodeFeat extends GetFunc {
  
    /**
     * Create a new DefaultGetFunc.
     *
     * @param param parameter of get udf
     */
    public SampleNodeFeat(SampleNodeFeatParam param) {
      super(param);
    }
  
    public SampleNodeFeat() {
      this(null);
    }
  
    @Override
    public PartitionGetResult partitionGet(PartitionGetParam partParam) {
      PartSampleNodeFeatParam sampleParam = (PartSampleNodeFeatParam) partParam;
      ServerLongAnyRow row = GraphMatrixUtils.getPSLongKeyRow(psContext, partParam);
  
      int count = Math.min(row.size(), sampleParam.getCount());
      IntFloatVector[] feats =
          SampleUtils.sampleNodeFeatByCount(row, count, System.currentTimeMillis());
  
      return new PartSampleNodeFeatResult(sampleParam.getPartKey().getPartitionId(), feats);
    }
  
    @Override
    public GetResult merge(List<PartitionGetResult> partResults) {
      List<IntFloatVector> results = new ArrayList<>();
      for (PartitionGetResult partResult : partResults) {
        results.addAll(Arrays.asList(((PartSampleNodeFeatResult) partResult).getNodeFeats()));
      }
      return new SampleNodeFeatResult(results);
    }
  }