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The driver API for engineblock;
Provides the interfaces needed to build drivers that can be loaded by engineblock core
/*
*
* Copyright 2016 jshook
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* /
*/
package io.engineblock.metrics;
import com.codahale.metrics.*;
import io.engineblock.activityapi.core.MetricRegistryService;
import io.engineblock.activityimpl.ActivityDef;
import io.engineblock.util.Unit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.script.ScriptContext;
import java.io.File;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
public class ActivityMetrics {
private final static Logger logger = LoggerFactory.getLogger(ActivityMetrics.class);
private static MetricRegistry registry;
public static MetricFilter METRIC_FILTER = (name, metric) -> {
return true;
};
private static List metricsCloseables = new ArrayList<>();
private ActivityMetrics() {
}
/**
* Register a named metric for an activity, synchronized on the activity
*
* @param activityDef The activity def that the metric will be for
* @param name The full metric name
* @param metricProvider A function to actually create the metric if needed
* @return a Metric, or null if the metric for the name was already present
*/
@SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
private static Metric register(ActivityDef activityDef, String name, MetricProvider metricProvider) {
String fullMetricName = activityDef.getAlias() + "." + name;
Metric metric = get().getMetrics().get(fullMetricName);
if (metric == null) {
synchronized (activityDef) {
metric = get().getMetrics().get(fullMetricName);
if (metric == null) {
metric = metricProvider.getMetric();
return get().register(fullMetricName, metric);
}
}
}
return metric;
}
private static Metric register(ScriptContext context, String name, MetricProvider metricProvider) {
Metric metric = get().getMetrics().get(name);
if (metric == null) {
synchronized (context) {
metric = get().getMetrics().get(name);
if (metric == null) {
metric = metricProvider.getMetric();
Metric registered = get().register(name, metric);
logger.info("registered scripting metric: " + name);
return registered;
}
}
}
return metric;
}
/**
* Create a timer associated with an activity.
* This method ensures that if multiple threads attempt to create the same-named metric on a given activity,
* that only one of them succeeds.
*
* @param activityDef an associated activity def
* @param name a simple, descriptive name for the timer
* @return the timer, perhaps a different one if it has already been registered
*/
public static Timer timer(ActivityDef activityDef, String name) {
String fullMetricName = activityDef.getAlias() + "." + name;
Timer registeredTimer = (Timer) register(activityDef, name, () ->
new NicerTimer(fullMetricName, new DeltaHdrHistogramReservoir(fullMetricName, 4)));
return registeredTimer;
}
/**
* Create a histogram associated with an activity.
* This method ensures that if multiple threads attempt to create the same-named metric on a given activity,
* that only one of them succeeds.
*
* @param activityDef an associated activity def
* @param name a simple, descriptive name for the histogram
* @return the histogram, perhaps a different one if it has already been registered
*/
public static Histogram histogram(ActivityDef activityDef, String name) {
String fullMetricName = activityDef.getAlias() + "." + name;
return (Histogram) register(activityDef, name, () ->
new NicerHistogram(fullMetricName, new DeltaHdrHistogramReservoir(fullMetricName, 4)));
}
/**
* Create a counter associated with an activity.
* This method ensures that if multiple threads attempt to create the same-named metric on a given activity,
* that only one of them succeeds.
*
* @param activityDef an associated activity def
* @param name a simple, descriptive name for the counter
* @return the counter, perhaps a different one if it has already been registered
*/
public static Counter counter(ActivityDef activityDef, String name) {
return (Counter) register(activityDef, name, Counter::new);
}
/**
* Create a meter associated with an activity.
* This method ensures that if multiple threads attempt to create the same-named metric on a given activity,
* that only one of them succeeds.
*
* @param activityDef an associated activity def
* @param name a simple, descriptive name for the meter
* @return the meter, perhaps a different one if it has already been registered
*/
public static Meter meter(ActivityDef activityDef, String name) {
return (Meter) register(activityDef, name, Meter::new);
}
private static MetricRegistry get() {
if (registry != null) {
return registry;
}
synchronized (ActivityMetrics.class) {
if (registry == null) {
registry = lookupRegistry();
}
}
return registry;
}
public static Gauge gauge(ActivityDef activityDef, String name, Gauge gauge) {
return (Gauge) register(activityDef, name, () -> gauge);
}
public static Gauge gauge(ScriptContext scriptContext, String name, Gauge gauge) {
return (Gauge) register(scriptContext, name, () -> gauge);
}
private static MetricRegistry lookupRegistry() {
ServiceLoader metricRegistryServices =
ServiceLoader.load(MetricRegistryService.class);
List mrss = new ArrayList<>();
metricRegistryServices.iterator().forEachRemaining(mrss::add);
if (mrss.size() == 1) {
return mrss.get(0).getMetricRegistry();
} else {
String infoMsg = "Unable to load a dynamic MetricRegistry via ServiceLoader, using the default.";
logger.info(infoMsg);
return new MetricRegistry();
}
}
public static MetricRegistry getMetricRegistry() {
return get();
}
/**
* Add a histogram interval logger to matching metrics in this JVM instance.
* @param sessionName The name for the session to be annotated in the histogram log
* @param pattern A regular expression pattern to filter out metric names for logging
* @param filename A file to log the histogram data in
* @param interval How many seconds to wait between writing each interval histogram
*/
public static void addHistoLogger(String sessionName, String pattern, String filename, String interval) {
if (filename.contains("_SESSION_")) {
filename = filename.replace("_SESSION_",sessionName);
}
Pattern compiledPattern = Pattern.compile(pattern);
File logfile = new File(filename);
long intervalMillis = Unit.msFor(interval).orElseThrow(()->new RuntimeException("Unable to parse interval spec:'" + interval + "'"));
HistoIntervalLogger histoIntervalLogger =
new HistoIntervalLogger(sessionName, logfile, compiledPattern, intervalMillis);
logger.debug("attaching " + histoIntervalLogger + " to the metrics registry.");
get().addListener(histoIntervalLogger);
metricsCloseables.add(histoIntervalLogger);
}
/**
* Add a histogram stats logger to matching metrics in this JVM instance.
* @param sessionName The name for the session to be annotated in the histogram log
* @param pattern A regular expression pattern to filter out metric names for logging
* @param filename A file to log the histogram data in
* @param interval How many seconds to wait between writing each interval histogram
*/
public static void addStatsLogger(String sessionName, String pattern, String filename, String interval) {
if (filename.contains("_SESSION_")) {
filename = filename.replace("_SESSION_",sessionName);
}
Pattern compiledPattern = Pattern.compile(pattern);
File logfile = new File(filename);
long intervalMillis = Unit.msFor(interval).orElseThrow(() -> new RuntimeException("Unable to parse interval spec:" + interval + "'"));
HistoStatsLogger histoStatsLogger =
new HistoStatsLogger(sessionName, logfile, compiledPattern, intervalMillis, TimeUnit.NANOSECONDS);
logger.debug("attaching " + histoStatsLogger + " to the metrics registry.");
get().addListener(histoStatsLogger);
metricsCloseables.add(histoStatsLogger);
}
/**
* This should be called at the end of a process, so that open intervals can be finished, logs closed properly,
* etc.
*/
public static void closeMetrics() {
logger.trace("Closing all registered metrics closable objects.");
for (MetricsCloseable metricsCloseable : metricsCloseables) {
logger.trace("closing metrics closeable: " + metricsCloseable);
metricsCloseable.closeMetrics();
}
}
private static interface MetricProvider {
Metric getMetric();
}
public static void reportTo(PrintStream out) {
out.println("==================== BEGIN-METRIC-LOG ====================");
ConsoleReporter consoleReporter = ConsoleReporter.forRegistry(ActivityMetrics.getMetricRegistry())
.convertDurationsTo(TimeUnit.MICROSECONDS)
.convertRatesTo(TimeUnit.SECONDS)
.filter(MetricFilter.ALL)
.outputTo(out)
.build();
consoleReporter.report();
out.println("==================== END-METRIC-LOG ====================");
}
public static void mountSubRegistry(String mountPrefix, MetricRegistry subRegistry) {
new MetricsRegistryMount(getMetricRegistry(),subRegistry,mountPrefix);
}
}
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