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/*
 * SonarQube
 * Copyright (C) 2009-2018 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.ce.queue;

import java.util.List;
import org.picocontainer.Startable;
import org.sonar.api.ce.ComputeEngineSide;
import org.sonar.api.platform.ServerUpgradeStatus;
import org.sonar.api.utils.log.Logger;
import org.sonar.api.utils.log.Loggers;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;

/**
 * Cleans-up the Compute Engine queue and resets the JMX counters.
 * CE workers must not be started before execution of this class.
 */
@ComputeEngineSide
public class CeQueueCleaner implements Startable {

  private static final Logger LOGGER = Loggers.get(CeQueueCleaner.class);

  private final DbClient dbClient;
  private final ServerUpgradeStatus serverUpgradeStatus;
  private final InternalCeQueue queue;

  public CeQueueCleaner(DbClient dbClient, ServerUpgradeStatus serverUpgradeStatus, InternalCeQueue queue) {
    this.dbClient = dbClient;
    this.serverUpgradeStatus = serverUpgradeStatus;
    this.queue = queue;
  }

  @Override
  public void start() {
    if (serverUpgradeStatus.isUpgraded()) {
      cleanOnUpgrade();
    } else {
      try (DbSession dbSession = dbClient.openSession(false)) {
        verifyConsistency(dbSession);
      }
    }
  }

  private void cleanOnUpgrade() {
    // we assume that pending tasks are not compatible with the new version
    // and can't be processed
    LOGGER.info("Cancel all pending tasks (due to upgrade)");
    queue.clear();
  }

  private void verifyConsistency(DbSession dbSession) {
    // Reports that have been processed are not kept in database yet.
    // They are supposed to be systematically dropped.
    // Let's clean-up orphans if any.
    List uuids = dbClient.ceTaskInputDao().selectUuidsNotInQueue(dbSession);
    dbClient.ceTaskInputDao().deleteByUuids(dbSession, uuids);
    dbSession.commit();
  }

  @Override
  public void stop() {
    // nothing to do
  }
}