apoorvmittal10 commented on code in PR #14619: URL: https://github.com/apache/kafka/pull/14619#discussion_r1375099869
########## clients/src/main/java/org/apache/kafka/common/telemetry/internals/MetricNamingConvention.java: ########## @@ -0,0 +1,119 @@ +/* + * 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.telemetry.internals; + +import org.apache.kafka.common.MetricName; + +import java.util.Collections; +import java.util.Locale; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Objects; +import java.util.regex.Pattern; +import java.util.stream.Collectors; + +/** + * This class encapsulates naming and mapping conventions defined as part of + * <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-714%3A+Client+metrics+and+observability#KIP714:Clientmetricsandobservability-Metricsnamingandformat";>Metrics naming and format</a> + */ +public class MetricNamingConvention { + + private static final String NAME_JOINER = "."; + private static final String TAG_JOINER = "_"; + + // remove metrics as it is redundant for telemetry metrics naming convention + private final static Pattern GROUP_PATTERN = Pattern.compile("\\.(metrics)"); + + public static MetricNamingStrategy<MetricName> getClientTelemetryMetricNamingStrategy(String domain) { + return new MetricNamingStrategy<MetricName>() { + @Override + public MetricKey metricKey(MetricName metricName) { + Objects.requireNonNull(metricName, "metric name cannot be null"); + String group = metricName.group() == null ? "" : metricName.group(); + String rawName = metricName.name() == null ? "" : metricName.name(); + + return new MetricKey(fullMetricName(domain, group, rawName), + Collections.unmodifiableMap(cleanTags(metricName.tags()))); + } + + @Override + public MetricKey derivedMetricKey(MetricKey key, String derivedComponent) { + Objects.requireNonNull(derivedComponent, "derived component cannot be null"); + return new MetricKey(key.getName() + NAME_JOINER + derivedComponent, key.tags()); + } + }; + } + + /** + * Creates a metric name given the domain, group, and name. The new String follows the following + * conventions and rules: + * + * <ul> + * <li>domain is expected to be a host-name like value, e.g. {@code org.apache.kafka}</li> + * <li>group is cleaned of redundant words: "-metrics"</li> + * <li>the group and metric name is dot separated</li> + * <li>The name is created by joining the three components, e.g.: + * {@code org.apache.kafka.producer.connection.creation.rate}</li> + * </ul> + */ + private static String fullMetricName(String domain, String group, String name) { + return domain + + NAME_JOINER + + cleanGroup(group) + + NAME_JOINER + + cleanMetric(name); + } + + /** + * This method maps a raw name to follow conventions and cleans up the result to be more legible: + * <ul> + * <li> converts names to lower hyphen case conventions + * <li> strips redundant parts of the metric name, such as -metrics + * <li> normalizes artifacts of hyphen case to dot separated conversion + * </ul> + */ + private static String cleanGroup(String group) { + group = clean(group, NAME_JOINER); + return GROUP_PATTERN.matcher(group).replaceAll(""); + } + + private static String cleanMetric(String metric) { + return clean(metric, NAME_JOINER); + } + + /** + * Converts a tag name to match the telemetry naming conventions by converting snake_case. Review Comment: Done. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
