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| <h1 title="Package" class="title">Package org.eclipse.microprofile.metrics</h1> |
| <div class="docSummary"> |
| <div class="block">MicroProfile Metrics</div> |
| </div> |
| <p>See: <a href="#package.description">Description</a></p> |
| </div> |
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| <tr> |
| <th class="colFirst" scope="col">Interface</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Counter.html" title="interface in org.eclipse.microprofile.metrics">Counter</a></td> |
| <td class="colLast"> |
| <div class="block">An incrementing and decrementing counter metric.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Counting.html" title="interface in org.eclipse.microprofile.metrics">Counting</a></td> |
| <td class="colLast"> |
| <div class="block">An interface for metric types which have counts.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Gauge.html" title="interface in org.eclipse.microprofile.metrics">Gauge</a><T></td> |
| <td class="colLast"> |
| <div class="block">A gauge metric is an instantaneous reading of a particular value.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Histogram.html" title="interface in org.eclipse.microprofile.metrics">Histogram</a></td> |
| <td class="colLast"> |
| <div class="block">A metric which calculates the distribution of a value.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Meter.html" title="interface in org.eclipse.microprofile.metrics">Meter</a></td> |
| <td class="colLast"> |
| <div class="block">A meter metric which measures mean throughput and one-, five-, and fifteen-minute |
| exponentially-weighted moving average throughputs.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Metered.html" title="interface in org.eclipse.microprofile.metrics">Metered</a></td> |
| <td class="colLast"> |
| <div class="block">An object which maintains mean and exponentially-weighted rate.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Metric.html" title="interface in org.eclipse.microprofile.metrics">Metric</a></td> |
| <td class="colLast"> |
| <div class="block">A tag interface to indicate that a class is a metric.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/MetricFilter.html" title="interface in org.eclipse.microprofile.metrics">MetricFilter</a></td> |
| <td class="colLast"> |
| <div class="block">A filter used to determine whether or not a metric should be reported, among other things.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Sampling.html" title="interface in org.eclipse.microprofile.metrics">Sampling</a></td> |
| <td class="colLast"> |
| <div class="block">An object which samples values.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Timer.html" title="interface in org.eclipse.microprofile.metrics">Timer</a></td> |
| <td class="colLast"> |
| <div class="block">A timer metric which aggregates timing durations and provides duration statistics, plus |
| throughput statistics via <a href="../../../../org/eclipse/microprofile/metrics/Meter.html" title="interface in org.eclipse.microprofile.metrics"><code>Meter</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Timer.Context.html" title="interface in org.eclipse.microprofile.metrics">Timer.Context</a></td> |
| <td class="colLast"> |
| <div class="block">A timing context.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
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| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation"> |
| <caption><span>Class Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Metadata.html" title="class in org.eclipse.microprofile.metrics">Metadata</a></td> |
| <td class="colLast"> |
| <div class="block">Bean holding the metadata of one single metric.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/MetricRegistry.html" title="class in org.eclipse.microprofile.metrics">MetricRegistry</a></td> |
| <td class="colLast"> |
| <div class="block">The registry that stores metrics and their metadata.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/MetricUnits.html" title="class in org.eclipse.microprofile.metrics">MetricUnits</a></td> |
| <td class="colLast"> |
| <div class="block">Standard units constants for metric's <a href="../../../../org/eclipse/microprofile/metrics/Metadata.html" title="class in org.eclipse.microprofile.metrics"><code>Metadata</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/Snapshot.html" title="class in org.eclipse.microprofile.metrics">Snapshot</a></td> |
| <td class="colLast"> |
| <div class="block">A statistical snapshot of a <a href="../../../../org/eclipse/microprofile/metrics/Snapshot.html" title="class in org.eclipse.microprofile.metrics"><code>Snapshot</code></a>.</div> |
| </td> |
| </tr> |
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| <li class="blockList"> |
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| <tr> |
| <th class="colFirst" scope="col">Enum</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/MetricRegistry.Type.html" title="enum in org.eclipse.microprofile.metrics">MetricRegistry.Type</a></td> |
| <td class="colLast"> |
| <div class="block">An enumeration representing the scopes of the MetricRegistry</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/metrics/MetricType.html" title="enum in org.eclipse.microprofile.metrics">MetricType</a></td> |
| <td class="colLast"> |
| <div class="block">An enumeration representing the different types of metrics.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| </ul> |
| <a name="package.description"> |
| <!-- --> |
| </a> |
| <h2 title="Package org.eclipse.microprofile.metrics Description">Package org.eclipse.microprofile.metrics Description</h2> |
| <div class="block">MicroProfile Metrics |
| |
| <h2>Rational</h2> |
| |
| <p> |
| To ensure reliable operation of software it is necessary to monitor essential |
| system parameters. There is already JMX as standard to expose metrics, but |
| remote-JMX is not easy to deal with and especially does not fit well in a |
| polyglot environment where other services are not running on the JVM. To |
| enable monitoring in an easy fashion, the MicroProfile Metrics specification |
| provides a standard to instrument an application with metrics and provides a |
| simple REST endpoint for integration with monitoring services. |
| |
| <h2>Adding Metrics</h2> |
| <p> |
| MicroProfile Metrics provides 5 different metric types that can be used to |
| instrument an application. Developers can create an accompanying |
| <a href="../../../../org/eclipse/microprofile/metrics/Metadata.html" title="class in org.eclipse.microprofile.metrics"><code>Metadata</code></a> object to supply |
| the metric's name, description, display name, tags, and units. Once the |
| metric and the metadata are registered against the application |
| <a href="../../../../org/eclipse/microprofile/metrics/MetricRegistry.html" title="class in org.eclipse.microprofile.metrics"><code>MetricRegistry</code></a>, the |
| metrics will be available in the REST endpoints. |
| |
| <h2>Metric Types</h2> |
| |
| <p> |
| <a href="../../../../org/eclipse/microprofile/metrics/Counter.html" title="interface in org.eclipse.microprofile.metrics"><code>Counter</code></a> is used to measure |
| an increasing/decreasing value. |
| <p> |
| Example usage: |
| |
| <pre> |
| <code> |
| Counter count = metricRegistry.counter(metadata); |
| count.inc(); |
| </code> |
| </pre> |
| |
| <a href="../../../../org/eclipse/microprofile/metrics/Counter.html" title="interface in org.eclipse.microprofile.metrics"><code>Gauge</code></a> is used to provide the |
| immediate measurement of a value. |
| <p> |
| Example usage: |
| |
| <pre> |
| <code> |
| Gauge<Double> temperature = new Gauge<Double>() { |
| public Double getValue() { |
| return getTemperature(); |
| } |
| }; |
| metricRegistry.register(metadata, temperature); |
| </code> |
| </pre> |
| |
| |
| <a href="../../../../org/eclipse/microprofile/metrics/Meter.html" title="interface in org.eclipse.microprofile.metrics"><code>Meter</code></a> is used to measure the |
| frequency of an event. |
| <p> |
| Example usage: |
| |
| <pre> |
| <code> |
| Meter meter = metricRegistry.meter(metadata); |
| meter.mark(); |
| </code> |
| </pre> |
| |
| |
| <a href="../../../../org/eclipse/microprofile/metrics/Histogram.html" title="interface in org.eclipse.microprofile.metrics"><code>Histogram</code></a> is used to |
| sample and compute the distribution of values |
| <p> |
| Example usage: |
| |
| <pre> |
| <code> |
| Histogram histogram = metricRegistry.histogram(metadata); |
| histogram.update(score); |
| </code> |
| </pre> |
| |
| <a href="../../../../org/eclipse/microprofile/metrics/Timer.html" title="interface in org.eclipse.microprofile.metrics"><code>Timer</code></a> is used to measure the |
| duration of an event as well as the frequency of occurrence. |
| <p> |
| Example usage: |
| |
| <pre> |
| <code> |
| Timer timer = metricRegistry.timer(metadata); |
| Timer.Context context = timer.time(); |
| |
| ... // code that will be timed |
| |
| context.close(); |
| </code> |
| </pre></div> |
| </div> |
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