51 lines
1.4 KiB
Java
51 lines
1.4 KiB
Java
package eu.dnetlib.common.metrics;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import javax.annotation.PostConstruct;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import io.micrometer.core.instrument.Metrics;
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import io.prometheus.client.Collector.MetricFamilySamples;
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import io.prometheus.client.GaugeMetricFamily;
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import io.prometheus.client.exporter.common.TextFormat;
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@Component
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public class MetricUtils {
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@Autowired(required = false)
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private Map<String, MetricInfo> kpiMetrics;
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@PostConstruct
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public void registerToMainEndpoint() {
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if (kpiMetrics != null) {
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kpiMetrics.forEach((k, v) -> Metrics.gauge(k, v, o -> o.obtainValue()));
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}
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}
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public String output(final String contentType) {
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try {
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final List<MetricFamilySamples> samples = new ArrayList<>();
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if (kpiMetrics != null) {
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kpiMetrics.forEach((k, v) -> samples.add(new GaugeMetricFamily(k, "", v.obtainValue())));
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}
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final Writer writer = new StringWriter();
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TextFormat.writeFormat(contentType, writer, Collections.enumeration(samples));
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return writer.toString();
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} catch (final IOException e) {
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// This actually never happens since StringWriter::write() doesn't throw any IOException
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throw new RuntimeException("Writing metrics failed", e);
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}
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}
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}
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