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.ambari.server.alerts;
  
  import static java.util.Collections.emptyList;
  import static java.util.Collections.singletonList;
  
  import java.net.URI;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.configuration.ComponentSSLConfiguration;
  import org.apache.ambari.server.controller.internal.URLStreamProvider;
  import org.apache.ambari.server.controller.jmx.JMXMetricHolder;
  import org.apache.ambari.server.orm.entities.AlertDefinitionEntity;
  import org.apache.ambari.server.state.Alert;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.ConfigHelper;
  import org.apache.ambari.server.state.alert.AlertDefinition;
  import org.apache.ambari.server.state.alert.AlertDefinitionFactory;
  import org.apache.ambari.server.state.alert.MetricSource;
  import org.apache.ambari.server.state.alert.ServerSource;
  import org.apache.ambari.server.state.services.MetricsRetrievalService;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Inject;
  
  /**
   * I represent a "SERVER" {@link org.apache.ambari.server.state.alert.SourceType} alert
   * which can pull JMX metrics from a remote cluster.
   */
  public class JmxServerSideAlert extends AlertRunnable {
    private final static Logger LOG = LoggerFactory.getLogger(JmxServerSideAlert.class);
    @Inject
    private AlertDefinitionFactory definitionFactory;
    @Inject
    private MetricsRetrievalService metricsRetrievalService;
    @Inject
    private ConfigHelper configHelper;
  
    public JmxServerSideAlert(String definitionName) {
      super(definitionName);
    }
  
    @Override
    List<Alert> execute(Cluster cluster, AlertDefinitionEntity entity) throws AmbariException {
      AlertDefinition alertDef = definitionFactory.coerce(entity);
      ServerSource serverSource = (ServerSource) alertDef.getSource();
      return buildAlert(jmxMetric(serverSource, cluster), serverSource.getJmxInfo(), alertDef)
        .map(alert -> singletonList(alert))
        .orElse(emptyList());
    }
  
    public Optional<Alert> buildAlert(Optional<JMXMetricHolder> metricHolder, MetricSource.JmxInfo jmxInfo, AlertDefinition alertDef) {
      return metricHolder.flatMap(metric -> buildAlert(metric, jmxInfo, alertDef));
    }
  
    private Optional<Alert> buildAlert(JMXMetricHolder metricHolder, MetricSource.JmxInfo jmxInfo, AlertDefinition alertDef) {
      List<Object> allMetrics = metricHolder.findAll(jmxInfo.getPropertyList());
      return jmxInfo.eval(metricHolder).map(val -> alertDef.buildAlert(val.doubleValue(), allMetrics));
    }
  
    private Optional<JMXMetricHolder> jmxMetric(ServerSource serverSource, Cluster cluster) throws AmbariException {
      URI jmxUri = jmxUrl(cluster, serverSource);
      URLStreamProvider streamProvider = new URLStreamProvider(
        serverSource.getUri().getConnectionTimeoutMsec(),
        serverSource.getUri().getReadTimeoutMsec(),
        ComponentSSLConfiguration.instance());
      metricsRetrievalService.submitRequest(MetricsRetrievalService.MetricSourceType.JMX, streamProvider, jmxUri.toString());
      return Optional.ofNullable(metricsRetrievalService.getCachedJMXMetric(jmxUri.toString()));
    }
  
    private URI jmxUrl(Cluster cluster, ServerSource serverSource) throws AmbariException {
      return serverSource.getUri().resolve(config(cluster)).resolve(serverSource.getJmxInfo().getUrlSuffix());
    }
  
    private Map<String, Map<String, String>> config(Cluster cluster) throws AmbariException {
      return configHelper.getEffectiveConfigProperties(cluster, configHelper.getEffectiveDesiredTags(cluster, null));
    }
  }
  