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.consistent;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Set;
  
  import com.google.common.base.Preconditions;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.repair.SharedContext;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.repair.messages.FailSession;
  import org.apache.cassandra.repair.messages.FinalizePromise;
  import org.apache.cassandra.repair.messages.PrepareConsistentResponse;
  import org.apache.cassandra.repair.messages.RepairMessage;
  import org.apache.cassandra.service.ActiveRepairService;
  import org.apache.cassandra.repair.NoSuchRepairSessionException;
  import org.apache.cassandra.utils.TimeUUID;
  
  import static org.apache.cassandra.repair.messages.RepairMessage.sendFailureResponse;
  
  /**
   * Container for all consistent repair sessions a node is coordinating
   */
  public class CoordinatorSessions
  {
      private static final Logger logger = LoggerFactory.getLogger(CoordinatorSessions.class);
      private final SharedContext ctx;
      
      private final Map<TimeUUID, CoordinatorSession> sessions = new HashMap<>();
  
      public CoordinatorSessions(SharedContext ctx)
      {
          this.ctx = ctx;
      }
  
      protected CoordinatorSession buildSession(CoordinatorSession.Builder builder)
      {
          return new CoordinatorSession(builder);
      }
  
      public synchronized CoordinatorSession registerSession(TimeUUID sessionId, Set<InetAddressAndPort> participants, boolean isForced) throws NoSuchRepairSessionException
      {
          ActiveRepairService.ParentRepairSession prs = ctx.repair().getParentRepairSession(sessionId);
  
          Preconditions.checkArgument(!sessions.containsKey(sessionId),
                                      "A coordinator already exists for session %s", sessionId);
          Preconditions.checkArgument(!isForced || prs.repairedAt == ActiveRepairService.UNREPAIRED_SSTABLE,
                                      "cannot promote data for forced incremental repairs");
  
          CoordinatorSession.Builder builder = CoordinatorSession.builder(ctx);
          builder.withState(ConsistentSession.State.PREPARING);
          builder.withSessionID(sessionId);
          builder.withCoordinator(prs.coordinator);
  
          builder.withTableIds(prs.getTableIds());
          builder.withRepairedAt(prs.repairedAt);
          builder.withRanges(prs.getRanges());
          builder.withParticipants(participants);
          builder.withListener(this::onSessionStateUpdate);
          builder.withContext(ctx);
          CoordinatorSession session = buildSession(builder);
          sessions.put(session.sessionID, session);
          return session;
      }
  
      public synchronized CoordinatorSession getSession(TimeUUID sessionId)
      {
          return sessions.get(sessionId);
      }
  
      public synchronized void onSessionStateUpdate(CoordinatorSession session)
      {
          if (session.isCompleted())
          {
              logger.info("Removing completed session {} with state {}", session.sessionID, session.getState());
              sessions.remove(session.sessionID);
          }
      }
  
      public void handlePrepareResponse(Message<? extends RepairMessage> msg)
      {
          PrepareConsistentResponse payload = (PrepareConsistentResponse) msg.payload;
          CoordinatorSession session = getSession(payload.parentSession);
          if (session != null)
          {
              session.handlePrepareResponse((Message<PrepareConsistentResponse>) msg);
          }
          else
          {
              sendFailureResponse(ctx, msg);
          }
      }
  
      public void handleFinalizePromiseMessage(Message<? extends RepairMessage> message)
      {
          FinalizePromise msg = (FinalizePromise) message.payload;
          CoordinatorSession session = getSession(msg.sessionID);
          if (session != null)
          {
              session.handleFinalizePromise((Message<FinalizePromise>) message);
          }
          else
          {
              sendFailureResponse(ctx, message);
          }
      }
  
      public void handleFailSessionMessage(FailSession msg)
      {
          CoordinatorSession session = getSession(msg.sessionID);
          if (session != null)
          {
              session.fail();
          }
      }
  }
  