content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.stress;
  
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.grpc.ConfigProperty;
  import alluxio.grpc.LocationBlockIdListEntry;
  import alluxio.master.MasterClientContext;
  import alluxio.worker.block.BlockMapIterator;
  import alluxio.worker.block.BlockMasterClient;
  import alluxio.worker.block.BlockStoreLocation;
  import alluxio.worker.block.RegisterStreamer;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicReference;
  
  /**
   * Use this class to avoid the map-list conversion at the client side.
   * This reduces the client side work so the time measurement for the whole RPC better reflects
   * the time taken at the master side.
   * Also reducing the workload on the client side will avoid the test becoming CPU-bound on the
   * client side, when the concurrency is high.
   */
  public class CachingBlockMasterClient extends BlockMasterClient {
    private static final Logger LOG = LoggerFactory.getLogger(CachingBlockMasterClient.class);
  
    private List<LocationBlockIdListEntry> mLocationBlockIdList;
    public CachingBlockMapIterator mBlockBatchIterator;
  
    /**
     * Creates a new instance and caches the converted proto.
     *
     * @param conf master client configuration
     * @param locationBlockIdList location block id list
     */
    public CachingBlockMasterClient(MasterClientContext conf,
        List<LocationBlockIdListEntry> locationBlockIdList) {
      super(conf);
      LOG.debug("Init CachingBlockMasterClient for unary RPC");
      mLocationBlockIdList = locationBlockIdList;
    }
  
    /**
     * Creates a new instance and caches the converted proto.
     *
     * @param conf master client configuration
     * @param blockMap block lists of each location
     */
    public CachingBlockMasterClient(MasterClientContext conf,
        Map<BlockStoreLocation, List<Long>> blockMap) {
      super(conf);
      LOG.info("Init CachingBlockMasterClient for streaming RPC");
      mBlockBatchIterator = new CachingBlockMapIterator(blockMap, conf.getClusterConf());
    }
  
    @Override
    public List<LocationBlockIdListEntry> convertBlockListMapToProto(
            Map<BlockStoreLocation, List<Long>> blockListOnLocation) {
      LOG.debug("Using the cached block list proto");
      return mLocationBlockIdList;
    }
  
    @Override
    public void registerWithStream(final long workerId, final List<String> storageTierAliases,
        final Map<String, Long> totalBytesOnTiers, final Map<String, Long> usedBytesOnTiers,
        final Map<BlockStoreLocation, List<Long>> currentBlocksOnLocation,
        final Map<String, List<String>> lostStorage,
        final List<ConfigProperty> configList) throws IOException {
      AtomicReference<IOException> ioe = new AtomicReference<>();
      retryRPC(() -> {
        try {
          RegisterStreamer stream =
              new RegisterStreamer(mAsyncClient, workerId, storageTierAliases, totalBytesOnTiers,
                  usedBytesOnTiers, lostStorage, configList, mBlockBatchIterator);
          stream.registerWithMaster();
        } catch (IOException e) {
          ioe.set(e);
        } catch (InterruptedException e) {
          ioe.set(new IOException(e));
        }
        return null;
      }, LOG, "Register", "workerId=%d", workerId);
  
      if (ioe.get() != null) {
        throw ioe.get();
      }
    }
  
    /**
     * Pre-generate the list so the RPC execution time does not include the conversion time.
     */
    public static class CachingBlockMapIterator extends BlockMapIterator {
      List<List<LocationBlockIdListEntry>> mBatches;
      Iterator<List<LocationBlockIdListEntry>> mDelegate;
  
      /**
       * Constructor.
       *
       * @param blockLocationMap the block lists of each location
       * @param conf configuration properties
       */
      public CachingBlockMapIterator(
          Map<BlockStoreLocation, List<Long>> blockLocationMap, AlluxioConfiguration conf) {
        super(blockLocationMap, conf);
        mBatches = new ArrayList<>();
        while (super.hasNext()) {
          mBatches.add(super.next());
        }
        mDelegate = mBatches.iterator();
      }
  
      @Override
      public boolean hasNext() {
        return mDelegate.hasNext();
      }
  
      @Override
      public List<LocationBlockIdListEntry> next() {
        return mDelegate.next();
      }
    }
  }
  