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.kafka.common.metrics;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * An implementation of MetricsContext, it encapsulates required metrics context properties for Kafka services and clients
   */
  public class KafkaMetricsContext implements MetricsContext {
      /**
       * Client or Service's contextLabels map.
       */
      private final Map<String, String> contextLabels = new HashMap<>();
  
      /**
       * Create a MetricsContext with namespace, no service or client properties
       * @param namespace value for _namespace key
       */
      public KafkaMetricsContext(String namespace) {
          this(namespace, new HashMap<>());
      }
  
      /**
       * Create a MetricsContext with namespace, service or client properties
       * @param namespace value for _namespace key
       * @param contextLabels  contextLabels additional entries to add to the context.
       *                  values will be converted to string using Object.toString()
       */
      public KafkaMetricsContext(String namespace, Map<String, ?> contextLabels) {
          this.contextLabels.put(MetricsContext.NAMESPACE, namespace);
          contextLabels.forEach((key, value) -> this.contextLabels.put(key, value != null ? value.toString() : null));
      }
  
      @Override
      public Map<String, String> contextLabels() {
          return Collections.unmodifiableMap(contextLabels);
      }
  
  }
  