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.master.meta;
  
  import alluxio.RpcUtils;
  import alluxio.conf.PropertyKey;
  import alluxio.grpc.GetConfigHashPOptions;
  import alluxio.grpc.GetConfigHashPResponse;
  import alluxio.grpc.GetConfigurationPOptions;
  import alluxio.grpc.GetConfigurationPResponse;
  import alluxio.grpc.MetaMasterConfigurationServiceGrpc;
  import alluxio.grpc.RemovePathConfigurationPRequest;
  import alluxio.grpc.RemovePathConfigurationPResponse;
  import alluxio.grpc.SetPathConfigurationPRequest;
  import alluxio.grpc.SetPathConfigurationPResponse;
  import alluxio.grpc.UpdateConfigurationPRequest;
  import alluxio.grpc.UpdateConfigurationPResponse;
  import alluxio.wire.ConfigHash;
  
  import io.grpc.stub.StreamObserver;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  
  /**
   * This class is a gRPC handler for meta master RPCs.
   */
  public final class MetaMasterConfigurationServiceHandler
      extends MetaMasterConfigurationServiceGrpc.MetaMasterConfigurationServiceImplBase {
    private static final Logger LOG =
        LoggerFactory.getLogger(MetaMasterConfigurationServiceHandler.class);
  
    private final MetaMaster mMetaMaster;
    /**
     * The cached response of GetConfiguration to save serialization cost when configurations are
     * not updated.
     */
    private volatile GetConfigurationPResponse mClusterConf;
    private volatile GetConfigurationPResponse mPathConf;
  
    /**
     * @param metaMaster the Alluxio meta master
     */
    public MetaMasterConfigurationServiceHandler(MetaMaster metaMaster) {
      mMetaMaster = metaMaster;
    }
  
    @Override
    public void getConfiguration(GetConfigurationPOptions options,
        StreamObserver<GetConfigurationPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> {
        GetConfigurationPResponse clusterConf = mClusterConf;
        GetConfigurationPResponse pathConf = mPathConf;
        GetConfigurationPResponse.Builder builder = GetConfigurationPResponse.newBuilder();
        ConfigHash hash = mMetaMaster.getConfigHash();
        if (!options.getIgnoreClusterConf()) {
          if (clusterConf == null
              || !clusterConf.getClusterConfigHash().equals(hash.getClusterConfigHash())) {
            clusterConf = mMetaMaster.getConfiguration(options.toBuilder()
                .setIgnorePathConf(true).build()).toProto();
            mClusterConf = clusterConf;
          }
          builder.addAllClusterConfigs(clusterConf.getClusterConfigsList());
          builder.setClusterConfigHash(clusterConf.getClusterConfigHash());
        }
        if (!options.getIgnorePathConf()) {
          if (pathConf == null
              || !pathConf.getPathConfigHash().equals(hash.getPathConfigHash())) {
            pathConf = mMetaMaster.getConfiguration(options.toBuilder()
                .setIgnoreClusterConf(true).build()).toProto();
            mPathConf = pathConf;
          }
          builder.putAllPathConfigs(pathConf.getPathConfigsMap());
          builder.setPathConfigHash(pathConf.getPathConfigHash());
        }
        return builder.build();
      }, "getConfiguration", "request=%s", responseObserver, options);
    }
  
    @Override
    public void getConfigHash(GetConfigHashPOptions request,
        StreamObserver<GetConfigHashPResponse> responseObserver) {
      RpcUtils.call(LOG, () ->
          mMetaMaster.getConfigHash().toProto(), "getConfigHash", "request=%s", responseObserver,
          request);
    }
  
    @Override
    public void setPathConfiguration(SetPathConfigurationPRequest request,
        StreamObserver<SetPathConfigurationPResponse> responseObserver) {
      String path = request.getPath();
      Map<String, String> properties = request.getPropertiesMap();
  
      RpcUtils.call(LOG, () -> {
        Map<PropertyKey, String> props = new HashMap<>();
        properties.forEach((key, value) -> props.put(PropertyKey.fromString(key), value));
        mMetaMaster.setPathConfiguration(path, props);
        return SetPathConfigurationPResponse.getDefaultInstance();
      }, "setPathConfiguration", "request=%s", responseObserver, request);
    }
  
    @Override
    public void removePathConfiguration(RemovePathConfigurationPRequest request,
        StreamObserver<RemovePathConfigurationPResponse> responseObserver) {
      String path = request.getPath();
      List<String> keys = request.getKeysList();
  
      RpcUtils.call(LOG, () -> {
        if (keys.isEmpty()) {
          mMetaMaster.removePathConfiguration(path);
        } else {
          mMetaMaster.removePathConfiguration(path, new HashSet<>(keys));
        }
        return RemovePathConfigurationPResponse.getDefaultInstance();
      }, "removePathConfiguration", "request=%s", responseObserver, request);
    }
  
    @Override
    public void updateConfiguration(
        UpdateConfigurationPRequest request,
        StreamObserver<UpdateConfigurationPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> {
        Map<String, Boolean> result =
            mMetaMaster.updateConfiguration(request.getPropertiesMap());
        return UpdateConfigurationPResponse.newBuilder()
            .putAllStatus(result)
            .build();
      }, "updateConfiguration", "request=%s", responseObserver, request);
    }
  }
  