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.metrics.rest;
  
  import com.alibaba.metrics.IMetricManager;
  import com.alibaba.metrics.Metric;
  import com.alibaba.metrics.MetricFilter;
  import com.alibaba.metrics.MetricLevel;
  import com.alibaba.metrics.MetricManager;
  import com.alibaba.metrics.MetricName;
  import com.alibaba.metrics.MetricRegistry;
  
  import javax.ws.rs.POST;
  import javax.ws.rs.Path;
  import javax.ws.rs.PathParam;
  import javax.ws.rs.Produces;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.core.Response;
  import java.util.List;
  import java.util.SortedMap;
  
  import static com.alibaba.metrics.rest.Utils.buildResult;
  
  @Path("/metrics/controller")
  public class MetricsController {
  
      private static IMetricManager manager = MetricManager.getIMetricManager();
  
      @Path("/changeLevel/{group}/{metricPrefix}/{level}")
      @POST
      @Produces({Constants.PRODUCE_JSON_WITH_QUALITY_SOURCE, MediaType.TEXT_HTML})
      public Response changeMetricLevel(@PathParam("group") String group,
                                                            final @PathParam("metricPrefix") String metricPrefix,
                                                            @PathParam("level") String level) {
  
          MetricFilter prefixFilter = new MetricFilter() {
              @Override
              public boolean matches(MetricName name, Metric metric) {
                  return name.getKey().startsWith(metricPrefix);
              }
          };
  
          MetricLevel levelToChange;
  
          try {
              levelToChange = MetricLevel.valueOf(level.toUpperCase());
          } catch (IllegalArgumentException e) {
              return buildResult(null, false, "Incorrect metric level!");
          }
  
          if ("all".equalsIgnoreCase(group)) {
  
              for (String groupName : manager.listMetricGroups()) {
                  try {
                      MetricRegistry registry = manager.getMetricRegistryByGroup(groupName);
                      changeMetricLevel(registry, prefixFilter, levelToChange);
                  } catch (Throwable e) {
                      return buildResult(null, false, e.getMessage());
                  }
              }
  
              return buildResult(null, true, "");
  
          } else {
              List<String> groups = manager.listMetricGroups();
              if (!groups.contains(group)) {
                  return buildResult(null, false, "The specified group is not found!");
              }
              MetricRegistry registry = manager.getMetricRegistryByGroup(group);
              changeMetricLevel(registry, prefixFilter, levelToChange);
              return buildResult(null, true, "");
          }
      }
  
      private void changeMetricLevel(MetricRegistry registry, MetricFilter filter, MetricLevel levelToChange) {
          for (SortedMap.Entry<MetricName, Metric> entry: registry.getMetrics(filter).entrySet()) {
              entry.getKey().level(levelToChange);
          }
      }
  
  }
  