content: /*
   * 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.cassandra.service.accord.interop;
  
  import accord.coordinate.Timeout;
  import accord.local.Node;
  import accord.messages.Callback;
  import accord.messages.ReadData;
  import accord.messages.ReadData.ReadOk;
  import accord.messages.ReadData.ReadReply;
  import accord.utils.Invariants;
  import org.apache.cassandra.exceptions.RequestFailure;
  import org.apache.cassandra.exceptions.RequestFailureReason;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.RequestCallback;
  
  import static accord.messages.ReadData.CommitOrReadNack.Insufficient;
  
  public abstract class AccordInteropReadCallback<T> implements Callback<ReadReply>
  {
      private final Node.Id id;
      private final InetAddressAndPort endpoint;
      private final Message<?> message;
      private final RequestCallback<T> wrapped;
      private final AccordInteropExecution interopExecution;
  
      public AccordInteropReadCallback(Node.Id id, InetAddressAndPort endpoint, Message<?> message, RequestCallback<T> wrapped, AccordInteropExecution interopExecution)
      {
          this.id = id;
          this.message = message;
          this.endpoint = endpoint;
          this.wrapped = wrapped;
          this.interopExecution = interopExecution;
      }
  
      abstract T convertResponse(ReadOk ok);
  
      @Override
      public void onSuccess(Node.Id from, ReadReply reply)
      {
          Invariants.requireArgument(from.equals(id));
          if (reply.isOk())
          {
              ReadOk readOk = (ReadOk)reply;
              interopExecution.maybeUpdateUniqueHlc(readOk.uniqueHlc);
              wrapped.onResponse(message.responseWith(convertResponse(readOk)).withFrom(endpoint));
          }
          else if (reply == Insufficient)
          {
              // Might still send a response if we send a maximal commit. Accord would tryAlternative and send
              // both the commit and an additional repair, but Cassandra doesn't have tryAlternative unless we add
              // it and instead opts to trigger additional repair messages based on time.
              interopExecution.sendMaximalCommit(id);
          }
          else if (reply != ReadData.CommitOrReadNack.Waiting)
          {
              wrapped.onFailure(endpoint, RequestFailure.UNKNOWN);
          }
      }
  
      @Override
      public void onFailure(Node.Id from, Throwable failure)
      {
          RequestFailure requestFailure;
          // Convert from Accord's timeout exception to our failure reason because timeout is something
          // that is useful for metrics and can be handled differently
          if (failure instanceof Timeout)
              requestFailure = new RequestFailure(RequestFailureReason.TIMEOUT, failure);
          else
              requestFailure = new RequestFailure(RequestFailureReason.UNKNOWN, failure);
          wrapped.onFailure(endpoint, requestFailure);
      }
  
      @Override
      public boolean onCallbackFailure(Node.Id from, Throwable failure)
      {
          wrapped.onFailure(endpoint, RequestFailure.UNKNOWN);
          return true;
      }
  }
  