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.psf.triangle;
  
  import com.tencent.angel.ml.matrix.psf.update.base.PartitionUpdateParam;
  import com.tencent.angel.ml.matrix.psf.update.base.UpdateFunc;
  import com.tencent.angel.ml.matrix.psf.update.base.UpdateParam;
  import com.tencent.angel.ps.storage.matrix.ServerMatrix;
  import com.tencent.angel.ps.storage.partition.RowBasedPartition;
  import com.tencent.angel.ps.storage.vector.ServerLongAnyRow;
  import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
  import it.unimi.dsi.fastutil.objects.ObjectIterator;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.xerial.snappy.Snappy;
  
  import java.io.IOException;
  
  public class InitLongNeighborByteAttr extends UpdateFunc {
  
      private static final Logger LOG = LoggerFactory.getLogger(InitLongNeighborByteAttr.class);
  
      /**
       * Create a new UpdateParam
       *
       * @param param
       */
      public InitLongNeighborByteAttr(UpdateParam param) {
          super(param);
      }
  
      public InitLongNeighborByteAttr() {
          this(null);
      }
  
      @Override
      public void partitionUpdate(PartitionUpdateParam partParam) {
          PartInitNeighborAttrParam param = (PartInitNeighborAttrParam) partParam;
          ServerMatrix matrix = psContext.getMatrixStorageManager().getMatrix(partParam.getMatrixId());
          RowBasedPartition part = (RowBasedPartition) matrix
                  .getPartition(partParam.getPartKey().getPartitionId());
          ServerLongAnyRow row = (ServerLongAnyRow) part.getRow(0);
  
          ObjectIterator<Long2ObjectMap.Entry<NeighborsAttrsElement>> iter =
                  param.getNodeId2Neighbors().long2ObjectEntrySet().iterator();
  
          row.startWrite();
          try {
              while (iter.hasNext()) {
                  Long2ObjectMap.Entry<NeighborsAttrsElement> entry = iter.next();
                  NeighborsAttrsElement elem = entry.getValue();
                  if (elem == null) {
                      row.set(entry.getLongKey(), null);
                  } else {
                      // compress the neighbor IDs
                      try {
                          byte[] compressed = Snappy.compress(elem.getNeighborIds());
                          NeighborsAttrsCompressedElement compressedElement = new NeighborsAttrsCompressedElement(compressed, elem.getAttrs());
                          row.set(entry.getLongKey(), compressedElement);
                      } catch (IOException e) {
                          LOG.error("save neighbor table error!", e);
                          row.set(entry.getLongKey(), null);
                      }
                  }
  
              }
          } finally {
              row.endWrite();
          }
      }
  
  
  }
  