聊聊artemis的ActiveMQMetricsPlugin

序

本文主要研究一下artemis的ActiveMQMetricsPlugin

ActiveMQMetricsPlugin

activemq-artemis-2.11.0/artemis-server/src/main/java/org/apache/activemq/artemis/core/server/metrics/ActiveMQMetricsPlugin.java

public interface ActiveMQMetricsPlugin extends Serializable {

   ActiveMQMetricsPlugin init(Map options);

   MeterRegistry getRegistry();
}

• ActiveMQMetricsPlugin继承了Serializable，它定义了init方法以及getRegistry方法

SimpleMetricsPlugin

activemq-artemis-2.11.0/artemis-server/src/main/java/org/apache/activemq/artemis/core/server/metrics/plugins/SimpleMetricsPlugin.java

public class SimpleMetricsPlugin implements ActiveMQMetricsPlugin {

   private transient MeterRegistry meterRegistry;

   private Map options;

   @Override
   public ActiveMQMetricsPlugin init(Map options) {
      this.meterRegistry = new SimpleMeterRegistry();
      this.options = options;
      return this;
   }

   @Override
   public MeterRegistry getRegistry() {
      return meterRegistry;
   }

   public Map getOptions() {
      return options;
   }
}

• SimpleMetricsPlugin实现了ActiveMQMetricsPlugin接口，其init方法创建了SimpleMeterRegistry

LoggingMetricsPlugin

activemq-artemis-2.11.0/artemis-server/src/main/java/org/apache/activemq/artemis/core/server/metrics/plugins/LoggingMetricsPlugin.java

public class LoggingMetricsPlugin implements ActiveMQMetricsPlugin {

   private transient MeterRegistry meterRegistry;

   @Override
   public ActiveMQMetricsPlugin init(Map options) {
      this.meterRegistry = new LoggingMeterRegistry();
      return this;
   }

   @Override
   public MeterRegistry getRegistry() {
      return meterRegistry;
   }
}

• LoggingMetricsPlugin实现了ActiveMQMetricsPlugin接口，其init方法创建了LoggingMeterRegistry

FileConfigurationParser

activemq-artemis-2.11.0/artemis-server/src/main/java/org/apache/activemq/artemis/core/deployers/impl/FileConfigurationParser.java

public final class FileConfigurationParser extends XMLConfigurationUtil {

   //......

   private ActiveMQMetricsPlugin parseMetricsPlugin(final Node item, final Configuration config) {
      final String clazz = item.getAttributes().getNamedItem("class-name").getNodeValue();

      Map properties = getMapOfChildPropertyElements(item);

      ActiveMQMetricsPlugin metricsPlugin = AccessController.doPrivileged(new PrivilegedAction() {
         @Override
         public ActiveMQMetricsPlugin run() {
            return (ActiveMQMetricsPlugin) ClassloadingUtil.newInstanceFromClassLoader(FileConfigurationParser.class, clazz);
         }
      });

      ActiveMQServerLogger.LOGGER.initializingMetricsPlugin(clazz, properties.toString());
      config.setMetricsPlugin(metricsPlugin.init(properties));

      return metricsPlugin;
   }

   //......
}

• FileConfigurationParser的parseMetricsPlugin方法会获取配置的clazz及properties，然后实例化metricsPlugin并执行metricsPlugin.init(properties)

MetricsManager

activemq-artemis-2.11.0/artemis-server/src/main/java/org/apache/activemq/artemis/core/server/metrics/MetricsManager.java

public class MetricsManager {

   private final String brokerName;

   private final MeterRegistry meterRegistry;

   private final Map> meters = new ConcurrentHashMap<>();

   public MetricsManager(String brokerName, ActiveMQMetricsPlugin metricsPlugin) {
      this.brokerName = brokerName;
      meterRegistry = metricsPlugin.getRegistry();
      Metrics.globalRegistry.add(meterRegistry);
      new JvmMemoryMetrics().bindTo(meterRegistry);
   }

   public MeterRegistry getMeterRegistry() {
      return meterRegistry;
   }

   @FunctionalInterface
   public interface MetricGaugeBuilder {

      void register(String metricName, Object state, ToDoubleFunction f, String description);
   }

   public void registerQueueGauge(String address, String queue, Consumer builder) {
      final MeterRegistry meterRegistry = this.meterRegistry;
      if (meterRegistry == null) {
         return;
      }
      final List newMeters = new ArrayList<>();
      builder.accept((metricName, state, f, description) -> {
         Gauge.Builder meter = Gauge
            .builder("artemis." + metricName, state, f)
            .tag("broker", brokerName)
            .tag("address", address)
            .tag("queue", queue)
            .description(description);
         newMeters.add(meter);
      });
      final String resource = ResourceNames.QUEUE + queue;
      this.meters.compute(resource, (s, meters) -> {
         //the old meters are ignored on purpose
         meters = new ArrayList<>(newMeters.size());
         for (Gauge.Builder gauge : newMeters) {
            meters.add(gauge.register(meterRegistry));
         }
         return meters;
      });
   }

   public void registerAddressGauge(String address, Consumer builder) {
      final MeterRegistry meterRegistry = this.meterRegistry;
      if (meterRegistry == null) {
         return;
      }
      final List newMeters = new ArrayList<>();
      builder.accept((metricName, state, f, description) -> {
         Gauge.Builder meter = Gauge
            .builder("artemis." + metricName, state, f)
            .tag("broker", brokerName)
            .tag("address", address)
            .description(description);
         newMeters.add(meter);
      });
      final String resource = ResourceNames.ADDRESS + address;
      this.meters.compute(resource, (s, meters) -> {
         //the old meters are ignored on purpose
         meters = new ArrayList<>(newMeters.size());
         for (Gauge.Builder gauge : newMeters) {
            meters.add(gauge.register(meterRegistry));
         }
         return meters;
      });
   }

   public void registerBrokerGauge(Consumer builder) {
      final MeterRegistry meterRegistry = this.meterRegistry;
      if (meterRegistry == null) {
         return;
      }
      final List newMeters = new ArrayList<>();
      builder.accept((metricName, state, f, description) -> {
         Gauge.Builder meter = Gauge
            .builder("artemis." + metricName, state, f)
            .tag("broker", brokerName)
            .description(description);
         newMeters.add(meter);
      });
      final String resource = ResourceNames.BROKER + "." + brokerName;
      this.meters.compute(resource, (s, meters) -> {
         //the old meters are ignored on purpose
         meters = new ArrayList<>(newMeters.size());
         for (Gauge.Builder gauge : newMeters) {
            meters.add(gauge.register(meterRegistry));
         }
         return meters;
      });
   }

   public void remove(String component) {
      meters.computeIfPresent(component, (s, meters) -> {
         if (meters == null) {
            return null;
         }
         for (Meter meter : meters) {
            Meter removed = meterRegistry.remove(meter);
            if (ActiveMQServerLogger.LOGGER.isDebugEnabled()) {
               ActiveMQServerLogger.LOGGER.debug("Removed meter: " + removed.getId());
            }
         }
         return null;
      });
   }
}

• MetricsManager的构造器接收brokerName以及metricsPlugin两个参数；之后定义了registerQueueGauge(QueueImpl使用)、registerAddressGauge(AddressInfo使用)、registerBrokerGauge(ActiveMQServerImpl使用)、remove方法(QueueImpl、AddressInfo、ActiveMQServerImpl使用)

小结

ActiveMQMetricsPlugin继承了Serializable，它定义了init方法以及getRegistry方法；FileConfigurationParser的parseMetricsPlugin方法会获取配置的clazz及properties，然后实例化metricsPlugin并执行metricsPlugin.init(properties)；MetricsManager的构造器接收brokerName以及metricsPlugin两个参数；之后定义了registerQueueGauge(QueueImpl使用)、registerAddressGauge(AddressInfo使用)、registerBrokerGauge(ActiveMQServerImpl使用)、remove方法(QueueImpl、AddressInfo、ActiveMQServerImpl使用)

doc

• ActiveMQMetricsPlugin