kafka MetricsUtils 源码
kafka MetricsUtils 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/internals/MetricsUtils.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.internals;
import org.apache.kafka.common.metrics.Metrics;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
public class MetricsUtils {
/**
* Converts the provided time from milliseconds to the requested
* time unit.
*/
public static double convert(long timeMs, TimeUnit unit) {
switch (unit) {
case NANOSECONDS:
return timeMs * 1000.0 * 1000.0;
case MICROSECONDS:
return timeMs * 1000.0;
case MILLISECONDS:
return timeMs;
case SECONDS:
return timeMs / 1000.0;
case MINUTES:
return timeMs / (60.0 * 1000.0);
case HOURS:
return timeMs / (60.0 * 60.0 * 1000.0);
case DAYS:
return timeMs / (24.0 * 60.0 * 60.0 * 1000.0);
default:
throw new IllegalStateException("Unknown unit: " + unit);
}
}
/**
* Create a set of tags using the supplied key and value pairs. The order of the tags will be kept.
*
* @param keyValue the key and value pairs for the tags; must be an even number
* @return the map of tags that can be supplied to the {@link Metrics} methods; never null
*/
public static Map<String, String> getTags(String... keyValue) {
if ((keyValue.length % 2) != 0)
throw new IllegalArgumentException("keyValue needs to be specified in pairs");
Map<String, String> tags = new LinkedHashMap<>(keyValue.length / 2);
for (int i = 0; i < keyValue.length; i += 2)
tags.put(keyValue[i], keyValue[i + 1]);
return tags;
}
}
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