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 com.alibaba.jstorm.metric;
  
  import com.alibaba.jstorm.common.metric.*;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.*;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  /**
   * metric registry. generally methods of this class should not be exposed, wrapper methods in @see JStormMonitorMetrics should be called.
   *
   * @author Cody (weiyue.wy@alibaba-inc.com)
   * @since 2.0.5
   */
  public class AsmMetricRegistry implements AsmMetricSet {
      private static final long serialVersionUID = 8184106900230111064L;
      private static final Logger LOG = LoggerFactory.getLogger(AsmMetricRegistry.class);
  
      protected final ConcurrentMap<String, AsmMetric> metrics = new ConcurrentHashMap<>();
  
      public int size() {
          return metrics.size();
      }
  
      /**
       * Given a {@link com.alibaba.jstorm.common.metric.old.window.Metric}, registers it under the given name.
       *
       * @param name   the metric node
       * @param metric the metric
       * @param <T>    the type of the metric
       * @return {@code metric}
       * @throws IllegalArgumentException if the name is already registered
       */
      @SuppressWarnings("unchecked")
      public <T extends AsmMetric> AsmMetric register(String name, T metric) throws IllegalArgumentException {
          metric.setMetricName(name);
          final AsmMetric existing = metrics.putIfAbsent(name, metric);
          if (existing == null) {
              LOG.info("Successfully register metric of {}", name);
              return metric;
          } else {
              LOG.warn("duplicate metric: {}", name);
              return existing;
          }
      }
  
      /**
       * Removes the metric with the given name.
       *
       * @param name the metric node
       * @return whether or not the metric was removed
       */
      public boolean remove(String name) {
          final AsmMetric metric = metrics.remove(name);
          if (metric != null) {
              LOG.info("Successfully unregister metric of {}", name);
              return true;
          }
          return false;
      }
  
      public AsmMetric getMetric(String name) {
          return metrics.get(name);
      }
  
      /**
       * Returns a set of the names of all the metrics in the registry.
       *
       * @return the names of all the metrics
       */
      public SortedSet<String> getMetricNames() {
          return Collections.unmodifiableSortedSet(new TreeSet<String>(metrics.keySet()));
      }
  
      /**
       * Returns a map of all the gauges in the registry and their names.
       *
       * @return all the gauges in the registry
       */
      public SortedMap<String, AsmGauge> getGauges() {
          return getGauges(AsmMetricFilter.ALL);
      }
  
      /**
       * Returns a map of all the gauges in the registry and their names which match the given filter.
       *
       * @param filter the metric filter to match
       * @return all the gauges in the registry
       */
      public SortedMap<String, AsmGauge> getGauges(AsmMetricFilter filter) {
          return getMetrics(AsmGauge.class, filter);
      }
  
      /**
       * Returns a map of all the counters in the registry and their names.
       *
       * @return all the counters in the registry
       */
      public SortedMap<String, AsmCounter> getCounters() {
          return getCounters(AsmMetricFilter.ALL);
      }
  
      /**
       * Returns a map of all the counters in the registry and their names which match the given filter.
       *
       * @param filter the metric filter to match
       * @return all the counters in the registry
       */
      public SortedMap<String, AsmCounter> getCounters(AsmMetricFilter filter) {
          return getMetrics(AsmCounter.class, filter);
      }
  
      /**
       * Returns a map of all the histograms in the registry and their names.
       *
       * @return all the histograms in the registry
       */
      public SortedMap<String, AsmHistogram> getHistograms() {
          return getHistograms(AsmMetricFilter.ALL);
      }
  
      /**
       * Returns a map of all the histograms in the registry and their names which match the given filter.
       *
       * @param filter the metric filter to match
       * @return all the histograms in the registry
       */
      public SortedMap<String, AsmHistogram> getHistograms(AsmMetricFilter filter) {
          return getMetrics(AsmHistogram.class, filter);
      }
  
      /**
       * Returns a map of all the meters in the registry and their names.
       *
       * @return all the meters in the registry
       */
      public SortedMap<String, AsmMeter> getMeters() {
          return getMeters(AsmMetricFilter.ALL);
      }
  
      /**
       * Returns a map of all the meters in the registry and their names which match the given filter.
       *
       * @param filter the metric filter to match
       * @return all the meters in the registry
       */
      public SortedMap<String, AsmMeter> getMeters(AsmMetricFilter filter) {
          return getMetrics(AsmMeter.class, filter);
      }
  
      @SuppressWarnings("unchecked")
      private <T extends AsmMetric> SortedMap<String, T> getMetrics(Class<T> klass, AsmMetricFilter filter) {
          final TreeMap<String, T> timers = new TreeMap<String, T>();
          for (Map.Entry<String, AsmMetric> entry : metrics.entrySet()) {
              if (klass.isInstance(entry.getValue()) && filter.matches(entry.getKey(), entry.getValue())) {
                  timers.put(entry.getKey(), (T) entry.getValue());
              }
          }
          return timers;
      }
  
      @Override
      public Map<String, AsmMetric> getMetrics() {
          return metrics;
      }
  
  }
  