package com.aol.micro.server.application.metrics.jmx;
import java.lang.management.ManagementFactory;
import java.util.Arrays;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import javax.annotation.PostConstruct;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import javax.management.openmbean.CompositeData;
import cyclops.collections.MapX;
import cyclops.collections.SetX;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricRegistry;
import lombok.AllArgsConstructor;
import lombok.Getter;
@Component
public class JmxMetricsAcquirer {
private static final Logger logger = LoggerFactory.getLogger(JmxMetricsAcquirer.class);
private final MBeanServer server = ManagementFactory.getPlatformMBeanServer();
private final Map<String, MetricDescription> metricDescriptions;
private final int period;
private final TimeUnit timeUnit;
private final MetricRegistry metricRegistry;
@AllArgsConstructor
@Getter
private class MetricDescription {
private final ObjectName objectName;
private final String name;
private final Function<Object, Long> converter;
}
private Function<Object, Long> memoryConverter(String name) {
return o -> {
CompositeData cd = (CompositeData) o;
return (long) cd.get(name);
};
}
private Function<Object, Long> threadsConverter() {
return o -> {
Number n = (Number) o;
return n.longValue();
};
}
private Map<String, MetricDescription> createMetricDescriptions(String excludedString) {
MapX<String, MetricDescription> metricDescription = MapX.empty();
ObjectName memory;
try {
memory = new ObjectName("java.lang:type=Memory");
final ObjectName threads = new ObjectName("java.lang:type=Threading");
metricDescription.put("jvm.heap_memory",
new MetricDescription(memory, "HeapMemoryUsage", memoryConverter("used")));
metricDescription.put("jvm.heap_memory_committed",
new MetricDescription(memory, "HeapMemoryUsage", memoryConverter("committed")));
metricDescription.put("jvm.heap_memory_init",
new MetricDescription(memory, "HeapMemoryUsage", memoryConverter("init")));
metricDescription.put("jvm.heap_memory_max",
new MetricDescription(memory, "HeapMemoryUsage", memoryConverter("max")));
metricDescription.put("jvm.non_heap_memory",
new MetricDescription(memory, "NonHeapMemoryUsage", memoryConverter("used")));
metricDescription.put("jvm.non_heap_memory_committed",
new MetricDescription(memory, "NonHeapMemoryUsage", memoryConverter("committed")));
metricDescription.put("jvm.non_heap_memory_init",
new MetricDescription(memory, "NonHeapMemoryUsage", memoryConverter("init")));
metricDescription.put("jvm.non_heap_memory_max",
new MetricDescription(memory, "NonHeapMemoryUsage", memoryConverter("max")));
metricDescription.put("jvm.thread_count",
new MetricDescription(threads, "ThreadCount", threadsConverter()));
} catch (MalformedObjectNameException e) {
logger.info("Can't initialize jmx metrics", e);
}
SetX<String> excluded = SetX.fromIterable(Arrays.asList(excludedString.split(",")));
return metricDescription.filter(t -> !excluded.contains(t.v1));
}
@Autowired
public JmxMetricsAcquirer(MetricRegistry metricRegistry, @Value("${datadog.report.period:1}") int period,
@Value("${datadog.report.timeunit:SECONDS}") TimeUnit timeUnit,
@Value("${jmx.metrics.excluded:}") String excluded) {
this.metricRegistry = metricRegistry;
this.period = period;
this.timeUnit = timeUnit;
this.metricDescriptions = createMetricDescriptions(excluded);
}
@PostConstruct
public void init() {
for (Map.Entry<String, MetricDescription> metric : metricDescriptions.entrySet()) {
Metric m = new Gauge<Long>() {
@Override
public Long getValue() {
MetricDescription desc = metric.getValue();
Object o;
try {
o = server.getAttribute(desc.getObjectName(), desc.getName());
return metric.getValue().getConverter().apply(o);
} catch (AttributeNotFoundException | InstanceNotFoundException | MBeanException
| ReflectionException e) {
return null;
}
}
};
metricRegistry.register(MetricRegistry.name(JmxMetricsAcquirer.class, metric.getKey(), metric.getKey()), m);
}
}
}