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.cloudstack.ha.provider;
  
  import org.apache.cloudstack.ha.HAConfig;
  import org.apache.cloudstack.ha.HAResource;
  import org.joda.time.DateTime;
  
  import com.cloud.utils.component.Adapter;
  
  public interface HAProvider<R extends HAResource> extends Adapter {
  
      enum HAProviderConfig {
          HealthCheckTimeout,
          ActivityCheckTimeout,
          RecoveryTimeout,
          FenceTimeout,
          ActivityCheckFailureRatio,
          MaxActivityChecks,
          MaxRecoveryAttempts,
          MaxActivityCheckInterval,
          MaxDegradedWaitTimeout,
          RecoveryWaitTimeout
      };
  
      HAResource.ResourceType resourceType();
  
      HAResource.ResourceSubType resourceSubType();
  
      boolean isDisabled(R r);
  
      boolean isInMaintenanceMode(R r);
  
      boolean isEligible(R r);
  
      boolean isHealthy(R r) throws HACheckerException;
  
      boolean hasActivity(R r, DateTime afterThis) throws HACheckerException;
  
      boolean recover(R r) throws HARecoveryException;
  
      boolean fence(R r) throws HAFenceException;
  
      void fenceSubResources(R r);
  
      void enableMaintenance(R r);
  
      void sendAlert(R r, HAConfig.HAState nextState);
  
      Object getConfigValue(HAProviderConfig name, R r);
  }
  