/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *     http://www.apache.org/licenses/LICENSE-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 org.apache.hadoop.hdfs.protocolPB;

import java.io.Closeable;
import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.AddMountTableEntryRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.AddMountTableEntryResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.DisableNameserviceRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.DisableNameserviceResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.EnableNameserviceRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.EnableNameserviceResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.EnterSafeModeRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.EnterSafeModeResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.GetDisabledNameservicesRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.GetDisabledNameservicesResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.GetMountTableEntriesRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.GetMountTableEntriesResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.GetSafeModeRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.GetSafeModeResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.LeaveSafeModeRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.LeaveSafeModeResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.RemoveMountTableEntryRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.RemoveMountTableEntryResponseProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.UpdateMountTableEntryRequestProto;
import org.apache.hadoop.hdfs.federation.protocol.proto.HdfsServerFederationProtos.UpdateMountTableEntryResponseProto;
import org.apache.hadoop.hdfs.server.federation.resolver.MountTableManager;
import org.apache.hadoop.hdfs.server.federation.router.NameserviceManager;
import org.apache.hadoop.hdfs.server.federation.router.RouterStateManager;
import org.apache.hadoop.hdfs.server.federation.store.protocol.AddMountTableEntryRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.AddMountTableEntryResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.DisableNameserviceRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.DisableNameserviceResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.EnableNameserviceRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.EnableNameserviceResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.EnterSafeModeRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.EnterSafeModeResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetDisabledNameservicesRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetDisabledNameservicesResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetMountTableEntriesRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetMountTableEntriesResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetSafeModeRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetSafeModeResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.LeaveSafeModeRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.LeaveSafeModeResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.RemoveMountTableEntryRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.RemoveMountTableEntryResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.UpdateMountTableEntryRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.UpdateMountTableEntryResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.AddMountTableEntryRequestPBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.AddMountTableEntryResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.DisableNameserviceRequestPBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.DisableNameserviceResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.EnableNameserviceRequestPBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.EnableNameserviceResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.EnterSafeModeResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.GetDisabledNameservicesResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.GetMountTableEntriesRequestPBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.GetMountTableEntriesResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.GetSafeModeResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.LeaveSafeModeResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.RemoveMountTableEntryRequestPBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.RemoveMountTableEntryResponsePBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.UpdateMountTableEntryRequestPBImpl;
import org.apache.hadoop.hdfs.server.federation.store.protocol.impl.pb.UpdateMountTableEntryResponsePBImpl;
import org.apache.hadoop.ipc.ProtobufHelper;
import org.apache.hadoop.ipc.ProtocolMetaInterface;
import org.apache.hadoop.ipc.ProtocolTranslator;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RpcClientUtil;

import com.google.protobuf.ServiceException;

/**
 * This class forwards NN's ClientProtocol calls as RPC calls to the NN server
 * while translating from the parameter types used in ClientProtocol to the
 * new PB types.
 */
@InterfaceAudience.Private
@InterfaceStability.Stable
public class RouterAdminProtocolTranslatorPB
    implements ProtocolMetaInterface, MountTableManager,
    Closeable, ProtocolTranslator, RouterStateManager, NameserviceManager {
  final private RouterAdminProtocolPB rpcProxy;

  public RouterAdminProtocolTranslatorPB(RouterAdminProtocolPB proxy) {
    rpcProxy = proxy;
  }

  @Override
  public void close() {
    RPC.stopProxy(rpcProxy);
  }

  @Override
  public Object getUnderlyingProxyObject() {
    return rpcProxy;
  }

  @Override
  public boolean isMethodSupported(String methodName) throws IOException {
    return RpcClientUtil.isMethodSupported(rpcProxy,
        RouterAdminProtocolPB.class, RPC.RpcKind.RPC_PROTOCOL_BUFFER,
        RPC.getProtocolVersion(RouterAdminProtocolPB.class), methodName);
  }

  @Override
  public AddMountTableEntryResponse addMountTableEntry(
      AddMountTableEntryRequest request) throws IOException {
    AddMountTableEntryRequestPBImpl requestPB =
        (AddMountTableEntryRequestPBImpl)request;
    AddMountTableEntryRequestProto proto = requestPB.getProto();
    try {
      AddMountTableEntryResponseProto response =
          rpcProxy.addMountTableEntry(null, proto);
      return new AddMountTableEntryResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public UpdateMountTableEntryResponse updateMountTableEntry(
      UpdateMountTableEntryRequest request) throws IOException {
    UpdateMountTableEntryRequestPBImpl requestPB =
        (UpdateMountTableEntryRequestPBImpl)request;
    UpdateMountTableEntryRequestProto proto = requestPB.getProto();
    try {
      UpdateMountTableEntryResponseProto response =
          rpcProxy.updateMountTableEntry(null, proto);
      return new UpdateMountTableEntryResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public RemoveMountTableEntryResponse removeMountTableEntry(
      RemoveMountTableEntryRequest request) throws IOException {
    RemoveMountTableEntryRequestPBImpl requestPB =
        (RemoveMountTableEntryRequestPBImpl)request;
    RemoveMountTableEntryRequestProto proto = requestPB.getProto();
    try {
      RemoveMountTableEntryResponseProto responseProto =
          rpcProxy.removeMountTableEntry(null, proto);
      return new RemoveMountTableEntryResponsePBImpl(responseProto);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public GetMountTableEntriesResponse getMountTableEntries(
      GetMountTableEntriesRequest request) throws IOException {
    GetMountTableEntriesRequestPBImpl requestPB =
        (GetMountTableEntriesRequestPBImpl)request;
    GetMountTableEntriesRequestProto proto = requestPB.getProto();
    try {
      GetMountTableEntriesResponseProto response =
          rpcProxy.getMountTableEntries(null, proto);
      return new GetMountTableEntriesResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public EnterSafeModeResponse enterSafeMode(EnterSafeModeRequest request)
      throws IOException {
    EnterSafeModeRequestProto proto =
        EnterSafeModeRequestProto.newBuilder().build();
    try {
      EnterSafeModeResponseProto response =
          rpcProxy.enterSafeMode(null, proto);
      return new EnterSafeModeResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public LeaveSafeModeResponse leaveSafeMode(LeaveSafeModeRequest request)
      throws IOException {
    LeaveSafeModeRequestProto proto =
        LeaveSafeModeRequestProto.newBuilder().build();
    try {
      LeaveSafeModeResponseProto response =
          rpcProxy.leaveSafeMode(null, proto);
      return new LeaveSafeModeResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public GetSafeModeResponse getSafeMode(GetSafeModeRequest request)
      throws IOException {
    GetSafeModeRequestProto proto =
        GetSafeModeRequestProto.newBuilder().build();
    try {
      GetSafeModeResponseProto response =
          rpcProxy.getSafeMode(null, proto);
      return new GetSafeModeResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public DisableNameserviceResponse disableNameservice(
      DisableNameserviceRequest request) throws IOException {
    DisableNameserviceRequestPBImpl requestPB =
        (DisableNameserviceRequestPBImpl)request;
    DisableNameserviceRequestProto proto = requestPB.getProto();
    try {
      DisableNameserviceResponseProto response =
          rpcProxy.disableNameservice(null, proto);
      return new DisableNameserviceResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public EnableNameserviceResponse enableNameservice(
      EnableNameserviceRequest request) throws IOException {
    EnableNameserviceRequestPBImpl requestPB =
        (EnableNameserviceRequestPBImpl)request;
    EnableNameserviceRequestProto proto = requestPB.getProto();
    try {
      EnableNameserviceResponseProto response =
          rpcProxy.enableNameservice(null, proto);
      return new EnableNameserviceResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }

  @Override
  public GetDisabledNameservicesResponse getDisabledNameservices(
      GetDisabledNameservicesRequest request) throws IOException {
    GetDisabledNameservicesRequestProto proto =
        GetDisabledNameservicesRequestProto.newBuilder().build();
    try {
      GetDisabledNameservicesResponseProto response =
          rpcProxy.getDisabledNameservices(null, proto);
      return new GetDisabledNameservicesResponsePBImpl(response);
    } catch (ServiceException e) {
      throw new IOException(ProtobufHelper.getRemoteException(e).getMessage());
    }
  }
}