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.task;
  
  import java.util.concurrent.ExecutorService;
  
  import javax.inject.Inject;
  
  import org.apache.cloudstack.ha.HAConfig;
  import org.apache.cloudstack.ha.HAManager;
  import org.apache.cloudstack.ha.HAResource;
  import org.apache.cloudstack.ha.HAResourceCounter;
  import org.apache.cloudstack.ha.provider.HACheckerException;
  import org.apache.cloudstack.ha.provider.HAProvider;
  import org.apache.cloudstack.ha.provider.HAProvider.HAProviderConfig;
  import org.joda.time.DateTime;
  
  public class ActivityCheckTask extends BaseHATask {
  
  
      @Inject
      private HAManager haManager;
  
      private long disconnectTime;
      private long maxActivityChecks;
      private double activityCheckFailureRatio;
  
      public ActivityCheckTask(final HAResource resource, final HAProvider<HAResource> haProvider, final HAConfig haConfig, final HAProvider.HAProviderConfig haProviderConfig,
              final ExecutorService executor, final long disconnectTime) {
          super(resource, haProvider, haConfig, haProviderConfig, executor);
          this.disconnectTime = disconnectTime;
          this.maxActivityChecks = (Long)haProvider.getConfigValue(HAProviderConfig.MaxActivityChecks, resource);
          this.activityCheckFailureRatio = (Double)haProvider.getConfigValue(HAProviderConfig.ActivityCheckFailureRatio, resource);
      }
  
      public boolean performAction() throws HACheckerException {
          return getHaProvider().hasActivity(getResource(), new DateTime(disconnectTime));
      }
  
      public synchronized void processResult(boolean result, Throwable t) {
          final HAConfig haConfig = getHaConfig();
          final HAResourceCounter counter = haManager.getHACounter(haConfig.getResourceId(), haConfig.getResourceType());
  
          if (t != null && t instanceof HACheckerException) {
              haManager.transitionHAState(HAConfig.Event.Ineligible, getHaConfig());
              counter.resetActivityCounter();
              return;
          }
  
          counter.incrActivityCounter(!result);
  
          if (counter.getActivityCheckCounter() < maxActivityChecks) {
              haManager.transitionHAState(HAConfig.Event.TooFewActivityCheckSamples, haConfig);
              return;
          }
  
          if (counter.hasActivityThresholdExceeded(activityCheckFailureRatio)) {
              haManager.transitionHAState(HAConfig.Event.ActivityCheckFailureOverThresholdRatio, haConfig);
          } else {
              if (haManager.transitionHAState(HAConfig.Event.ActivityCheckFailureUnderThresholdRatio, haConfig)) {
                  counter.markResourceDegraded();
              }
          }
          counter.resetActivityCounter();
      }
  }
  