kafka KafkaMetricsContext 源码
kafka KafkaMetricsContext 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/KafkaMetricsContext.java
/*
* 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;
/**
* A 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);
}
}
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