Monitoring And Metrics With Grails 3

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Spring 2015, OCI Is Now Home To

Who is OCI We are Software Engineers – St. Louis HQ w/global delivery– 140+ engineers (30% w/Ph.d or Masters)– Average engineer experience >23yrs– Open Source/Standard focused since 1994– Developed and support 12 Free and Open

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Open Source Technologies

Spring 2015, OCI is now home to

Copyright (c) 2016 Object Computing, Inc. All rights reserved.

Aerospace & Defense

Telecommunications

Financial Services

Others

Information Technology

• dropwizard-metrics Grails 3 Plugin – Meterable – @Metered – @Timed – AST Transformations – etc…

• JMeter • JMX Enabled Services

– jconsole – @ManagedResource

Agenda

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• Grails 3 Plugin • Standard Gradle Dependency In build.gradle

Installing The Plugin

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dependencies { // ... compile ‘org.grails.plugins:dropwizard-metrics:1.0.0.BUILD-SNAPSHOT' }

Meters

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“A meter measures the rate of events over time (e.g., “requests per second”). In addition to the mean rate, meters also track 1-, 5-, and 15-minute moving averages.”

- http://metrics.dropwizard.io/3.1.0/manual/core/

Meterable Trait

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@TestMixin(GrailsUnitTestMixin)class MeterableSpec extends Specification { static doWithSpring = { metricRegistry MetricRegistry } void 'test markMeter method'() { setup: def registry = applicationContext.metricRegistry def obj = new SomeClass() when: obj.someAction() obj.someAction() obj.someAction() then: registry.meter('some meter').count == 3 } }

class SomeClass implements Meterable { def someAction() { markMeter 'some meter' // ... } }

@Metered Annotation

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class SomeMeteredClass { MetricRegistry metricRegistry void someAction() { String name = MetricRegistry.name(SomeMeteredClass, 'some meter') Meter meter = metricRegistry.meter(name) meter.mark() // ... }}

class SomeMeteredClass { @Metered('some meter') void someAction() { // ... } }

Timers

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“A timer is basically a histogram of the duration of a type of event and a meter of the rate of its occurrence.”

- http://metrics.dropwizard.io/3.1.0/manual/core/

@Timed Annotation

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class SomeTimedClass { MetricRegistry metricRegistry void someAction() { String name = MetricRegistry.name(SomeTimedClass, 'some timer') Timer timer = metricRegistry.timer(name) Timer.Context context = timer.time() try { // ... } finally { context.stop() } }}

class SomeTimedClass { @Timed('some timer') void someAction() { // ... } }

Managed Resources

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@ManagedResourceclass MetricsLoggerService { int highVolumeThreshold = 10 def metricRegistry def logMetrics() { Meter demoMeter = metricRegistry.meter(‘meter name')

def rate = demoMeter.oneMinuteRate if(rate > highVolumeThreshold) { log.warn "High Volume: $rate" } } @ManagedAttribute void setHighVolumeThreshold(int t) { highVolumeThreshold = t } @ManagedAttribute int getHighVolumeThreshold() { highVolumeThreshold } }

Q & A

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