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.repair;
  
  import java.util.concurrent.RunnableFuture;
  
  import org.apache.cassandra.exceptions.RequestFailure;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.RequestCallback;
  import org.apache.cassandra.repair.messages.RepairMessage;
  import org.apache.cassandra.repair.messages.SnapshotMessage;
  import org.apache.cassandra.utils.concurrent.AsyncFuture;
  
  import static org.apache.cassandra.net.Verb.SNAPSHOT_MSG;
  import static org.apache.cassandra.repair.messages.RepairMessage.notDone;
  
  /**
   * SnapshotTask is a task that sends snapshot request.
   */
  public class SnapshotTask extends AsyncFuture<InetAddressAndPort> implements RunnableFuture<InetAddressAndPort>
  {
      private final RepairJobDesc desc;
      private final InetAddressAndPort endpoint;
      private final SharedContext ctx;
  
      SnapshotTask(SharedContext ctx, RepairJobDesc desc, InetAddressAndPort endpoint)
      {
          this.ctx = ctx;
          this.desc = desc;
          this.endpoint = endpoint;
      }
  
      public void run()
      {
          RepairMessage.sendMessageWithRetries(ctx, notDone(this), new SnapshotMessage(desc), SNAPSHOT_MSG, endpoint, new SnapshotCallback(this));
      }
  
      /**
       * Callback for snapshot request. Run on INTERNAL_RESPONSE stage.
       */
      static class SnapshotCallback implements RequestCallback<InetAddressAndPort>
      {
          final SnapshotTask task;
  
          SnapshotCallback(SnapshotTask task)
          {
              this.task = task;
          }
  
          /**
           * When we received response from the node,
           *
           * @param msg response received.
           */
          @Override
          public void onResponse(Message msg)
          {
              task.trySuccess(task.endpoint);
          }
  
          @Override
          public boolean invokeOnFailure()
          {
              return true;
          }
  
          @Override
          public void onFailure(InetAddressAndPort from, RequestFailure failure)
          {
              task.tryFailure(new RuntimeException("Could not create snapshot at " + from + "; " + failure.reason));
          }
      }
  }
  