[GitHub] [kafka] ijuma commented on a diff in pull request #13067: KAFKA-14524: Rewrite KafkaMetricsGroup in Java

["ijuma (via GitHub)" <gi...@apache.org>]

ijuma commented on code in PR #13067:
URL: https://github.com/apache/kafka/pull/13067#discussion_r1103748681


##########
server-common/src/main/java/org/apache/kafka/server/metrics/KafkaMetricsGroup.java:
##########
@@ -0,0 +1,161 @@
+/*
+ * 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.server.metrics;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import com.yammer.metrics.core.Gauge;
+import com.yammer.metrics.core.Histogram;
+import com.yammer.metrics.core.Meter;
+import com.yammer.metrics.core.MetricName;
+import com.yammer.metrics.core.Timer;
+import org.apache.kafka.common.utils.Sanitizer;
+
+public class KafkaMetricsGroup {
+    private final Class<?> klass;
+
+    public KafkaMetricsGroup(final Class<?> klass) {
+        this.klass = klass;
+    }
+
+    /**
+     * Creates a new MetricName object for gauges, meters, etc. created for this
+     * metrics group.
+     * @param name Descriptive name of the metric.
+     * @param tags Additional attributes which mBean will have.
+     * @return Sanitized metric name object.
+     */
+    public MetricName metricName(final String name, final Map<String, String> tags) {
+        final String pkg;
+        if (klass.getPackage() == null) {
+            pkg = "";
+        } else {
+            pkg = klass.getPackage().getName();
+        }
+        final String simpleName = klass.getSimpleName().replaceAll("\\$$", "");
+        return explicitMetricName(pkg, simpleName, name, tags);
+    }
+
+    public final MetricName explicitMetricName(final String group, final String typeName,
+                                               final String name, final Map<String, String> tags) {
+        final StringBuilder nameBuilder = new StringBuilder();
+        nameBuilder.append(group);
+        nameBuilder.append(":type=");
+        nameBuilder.append(typeName);
+
+        if (!name.isEmpty()) {
+            nameBuilder.append(",name=");
+            nameBuilder.append(name);
+        }
+
+        final String scope = toScope(tags).orElse(null);
+        final Optional<String> tagsName = toMBeanName(tags);
+        tagsName.ifPresent(s -> nameBuilder.append(",").append(s));
+
+        return new MetricName(group, typeName, name, scope, nameBuilder.toString());
+    }
+
+    public final <T> Gauge<T> newGauge(final String name, final Gauge<T> metric, final Map<String, String> tags) {
+        return KafkaYammerMetrics.defaultRegistry().newGauge(metricName(name, tags), metric);
+    }
+
+    public final <T> Gauge<T> newGauge(final String name, final Gauge<T> metric) {
+        return newGauge(name, metric, Collections.emptyMap());
+    }
+
+    public final Meter newMeter(final String name, final String eventType,
+                                final TimeUnit timeUnit, final Map<String, String> tags) {
+        return KafkaYammerMetrics.defaultRegistry().newMeter(metricName(name, tags), eventType, timeUnit);
+    }
+
+    public final Meter newMeter(final String name, final String eventType,
+                                final TimeUnit timeUnit) {
+        return newMeter(name, eventType, timeUnit, Collections.emptyMap());
+    }
+
+    public final Meter newMeter(final MetricName metricName, final String eventType, final TimeUnit timeUnit) {
+        return KafkaYammerMetrics.defaultRegistry().newMeter(metricName, eventType, timeUnit);
+    }
+
+    public final Histogram newHistogram(final String name, final boolean biased, final Map<String, String> tags) {
+        return KafkaYammerMetrics.defaultRegistry().newHistogram(metricName(name, tags), biased);
+    }
+
+    public final Histogram newHistogram(final String name) {
+        return newHistogram(name, true, Collections.emptyMap());
+    }
+
+    public final Histogram newHistogram(final String name, final boolean biased) {
+        return newHistogram(name, biased, Collections.emptyMap());
+    }
+
+    public final Histogram newHistogram(final String name, final Map<String, String> tags) {
+        return newHistogram(name, true, tags);
+    }
+
+    public final Timer newTimer(final String name, final TimeUnit durationUnit, final TimeUnit rateUnit,
+                                final Map<String, String> tags) {
+        return KafkaYammerMetrics.defaultRegistry().newTimer(metricName(name, tags), durationUnit, rateUnit);
+    }
+
+    public final Timer newTimer(final String name, final TimeUnit durationUnit, final TimeUnit rateUnit) {
+        return newTimer(name, durationUnit, rateUnit, Collections.emptyMap());
+    }
+
+    public final void removeMetric(final String name, final Map<String, String> tags) {
+        KafkaYammerMetrics.defaultRegistry().removeMetric(metricName(name, tags));
+    }
+
+    public final void removeMetric(final String name) {
+        removeMetric(name, Collections.emptyMap());
+    }
+
+    private Optional<String> toMBeanName(final Map<String, String> tags) {

Review Comment:
   Good point, my bad.



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