import org.springframework.boot.actuate.metrics.export.Exporter; //导入依赖的package包/类
@Override
public void afterJob(JobExecution jobExecution) {
	long jobDuration = jobExecution.getEndTime().getTime() - jobExecution.getStartTime().getTime();
	gaugeService.submit(TIMER_PREFIX + jobExecution.getJobInstance().getJobName() + ".duration", jobDuration);
	// What the f*** is that Thread.sleep doing here? ;-)
	// Metrics are written asynchronously to Spring Boot's repository. In our tests we experienced
	// that sometimes batch execution was so fast that this listener couldn't export the metrics
	// because they hadn't been written. It all happened in the same millisecond. So we added
	// a Thread.sleep of 100 milliseconds which gives us enough safety and doesn't hurt anyone.
	try {
		Thread.sleep(100);
	} catch (InterruptedException e) {
		throw new RuntimeException(e);
	}
	// Export Metrics to Console or Remote Systems
	LOGGER.info(metricsOutputFormatter.format(exportBatchRichGauges(), exportBatchMetrics()));
	// Codahale
	if (exporters != null) {
		for (Exporter exporter : exporters) {
			if (exporter != null) {
				LOGGER.info("Exporting Metrics with " + exporter.getClass().getName());
				exporter.export();
			}
		}
	}
}
 

import org.springframework.boot.actuate.metrics.export.Exporter; //导入依赖的package包/类
public MetricExportAutoConfiguration(MetricExportProperties properties,
		ObjectProvider<MetricsEndpointMetricReader> endpointReaderProvider,
		@ExportMetricReader ObjectProvider<List<MetricReader>> readersProvider,
		@ExportMetricWriter ObjectProvider<Map<String, GaugeWriter>> writersProvider,
		ObjectProvider<Map<String, Exporter>> exportersProvider) {
	this.properties = properties;
	this.endpointReader = endpointReaderProvider.getIfAvailable();
	this.readers = readersProvider.getIfAvailable();
	this.writers = writersProvider.getIfAvailable();
	this.exporters = exportersProvider.getIfAvailable();
}
 

import org.springframework.boot.actuate.metrics.export.Exporter; //导入依赖的package包/类
public MetricsListener(GaugeService gaugeService, RichGaugeReader richGaugeReader,
		MetricReader metricReader, List<Exporter> exporters) {
	this.gaugeService = gaugeService;
	this.richGaugeReader = richGaugeReader;
	this.metricReader = metricReader;
	this.exporters = exporters;
}
 

import org.springframework.boot.actuate.metrics.export.Exporter; //导入依赖的package包/类
@Bean
@ConditionalOnMissingBean(Exporter.class)
public AtlasExporter exporter(AtlasMetricObserver observer, MetricPoller poller, AtlasProperties properties) {
    return new AtlasExporter(observer, poller, properties.getPublishDelay());
}
 

import org.springframework.boot.actuate.metrics.export.Exporter; //导入依赖的package包/类
@Bean
Exporter exporter() {
	return Mockito.mock(Exporter.class);
}