THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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public class Metrics {
/** The metrics reporters container. */
private final List<MetricsReporter> reporters;
/** The metrics group. */
private final MetricGroupList<MetricGroup> metricGroupmetricGroups;
/** Register metrics to MetricGroup.
@param name The name of metric.
@param metric The metric to register.
*/
public void registerMetrics(String name, Metric metric, int groupIndex) {}
} |
MetricGroup
MetricGroup is a class responsible for metrics registering and tagging, there is a metrics container in it. It provides register method for each type of measurable metric, registering metrics will put metrics to the metrics container.
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public class MetricGroup {
/** tags of metric group. */
private final Map<String, Set<String>> tags = new HashMap<>();
/** Map of gauge metrics. */
private final Map<String, Gauge<?>> gauges = new HashMap<>();
/** Map of counter metrics. */
private final Map<String, Counter> counters = new HashMap<>();
/** Map of counter metrics. */
private final Map<String, Histogram> histograms = new HashMap<>();
/** Register gauge metric. */
public void gauge(String name, Gauge gauge) {}
/** Register counter metric. */
public void counter(String name, Counter counter) {}
/** Register histogram metric. */
public void histogram(String name, Histogram counter) {}
/** Add tag for metricsmetric group. */
public void addTag(Metric metric, String tag, String value) {}
} |
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Take CommitMetrics as example, the CommitMetrics will be instantiated by FileStoreCommitImpl, then commit related metrics will be registered by the corresponding MetricGroup in singleton the Metrics instance.
The Metrics has instance of MetricGroup MetricGroups and MetricsReporters set. MetricGroup maintains metrics map containers. Metrics registering is a process of putting metrics instances into the metric (gauge, counter) map container.
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