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[metrics] Add Java Management Extensions (JMX) metrics exporter (open…
…hab#11249) * Add Java Management Extensions (JMX) metrics exporter * Use groups in metrics add-on configuration * Improve null annotations * Update documentation Signed-off-by: Wouter Born <github@maindrain.net> Signed-off-by: Dave J Schoepel <dave@theschoepels.com>
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...openhab.io.metrics/src/main/java/org/openhab/io/metrics/exporters/JmxMetricsExporter.java
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| /** | ||
| * Copyright (c) 2010-2021 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.io.metrics.exporters; | ||
|
|
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| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
| import org.openhab.io.metrics.MetricsConfiguration; | ||
| import org.openhab.io.metrics.MetricsExporter; | ||
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|
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| import io.micrometer.core.instrument.Clock; | ||
| import io.micrometer.core.instrument.composite.CompositeMeterRegistry; | ||
| import io.micrometer.jmx.JmxConfig; | ||
| import io.micrometer.jmx.JmxMeterRegistry; | ||
|
|
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| /** | ||
| * The {@link JmxMetricsExporter} class implements a MetricsExporter for Java Management Extensions (JMX). | ||
| * | ||
| * @author Wouter Born - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public class JmxMetricsExporter extends MetricsExporter { | ||
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| private @Nullable JmxMeterRegistry jmxMeterRegistry; | ||
| private @Nullable CompositeMeterRegistry meterRegistry; | ||
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| @Override | ||
| public void start(CompositeMeterRegistry meterRegistry, MetricsConfiguration metricsConfiguration) { | ||
| jmxMeterRegistry = new JmxMeterRegistry(getJmxConfig(), Clock.SYSTEM); | ||
| meterRegistry.add(jmxMeterRegistry); | ||
| } | ||
|
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| @Override | ||
| public void shutdown() { | ||
| JmxMeterRegistry jmxMeterRegistry = this.jmxMeterRegistry; | ||
| if (jmxMeterRegistry != null) { | ||
| jmxMeterRegistry.stop(); | ||
| this.jmxMeterRegistry = null; | ||
| } | ||
|
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| CompositeMeterRegistry meterRegistry = this.meterRegistry; | ||
| if (meterRegistry != null) { | ||
| meterRegistry.remove(jmxMeterRegistry); | ||
| this.meterRegistry = null; | ||
| } | ||
| } | ||
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| private JmxConfig getJmxConfig() { | ||
| return new JmxConfig() { | ||
| @Override | ||
| @io.micrometer.core.lang.Nullable | ||
| @Nullable | ||
| public String get(@Nullable String k) { | ||
| return null; // accept the rest of the defaults | ||
| } | ||
| }; | ||
| } | ||
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| @Override | ||
| protected boolean isEnabled(MetricsConfiguration config) { | ||
| return config.jmxMetricsEnabled; | ||
| } | ||
| } |
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