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Merge pull request #445 from brharrington/delegate-to-spectator
add support to delegate to spectator
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181 changes: 181 additions & 0 deletions
181
servo-core/src/main/java/com/netflix/servo/SpectatorContext.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| /* | ||
| * Copyright 2011-2018 Netflix, Inc. | ||
| * <p/> | ||
| * 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 | ||
| * <p/> | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * <p/> | ||
| * 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 com.netflix.servo; | ||
|
|
||
| import com.netflix.servo.monitor.CompositeMonitor; | ||
| import com.netflix.servo.monitor.Monitor; | ||
| import com.netflix.servo.monitor.MonitorConfig; | ||
| import com.netflix.servo.monitor.SpectatorMonitor; | ||
| import com.netflix.spectator.api.Counter; | ||
| import com.netflix.spectator.api.DistributionSummary; | ||
| import com.netflix.spectator.api.Gauge; | ||
| import com.netflix.spectator.api.Id; | ||
| import com.netflix.spectator.api.Measurement; | ||
| import com.netflix.spectator.api.Meter; | ||
| import com.netflix.spectator.api.NoopRegistry; | ||
| import com.netflix.spectator.api.Registry; | ||
| import com.netflix.spectator.api.Timer; | ||
| import com.netflix.spectator.api.patterns.PolledMeter; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.concurrent.Executors; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
|
|
||
| /** | ||
| * Helper that can be used to delegate to spectator. Other than calling | ||
| * {@link #setRegistry(Registry)} to set the registry to use, it is only intended for use | ||
| * within servo. | ||
| */ | ||
| public final class SpectatorContext { | ||
|
|
||
| private SpectatorContext() { | ||
| } | ||
|
|
||
| private static final ScheduledExecutorService GAUGE_POOL = Executors.newScheduledThreadPool( | ||
| 2, | ||
| task -> { | ||
| Thread t = new Thread(task, "servo-gauge-poller"); | ||
| t.setDaemon(true); | ||
| return t; | ||
| } | ||
| ); | ||
|
|
||
| private static final Logger LOGGER = LoggerFactory.getLogger(SpectatorContext.class); | ||
|
|
||
| private static volatile Registry registry = new NoopRegistry(); | ||
|
|
||
| /** | ||
| * Set the registry to use. By default it will use the NoopRegistry. | ||
| */ | ||
| public static void setRegistry(Registry registry) { | ||
| SpectatorContext.registry = registry; | ||
| } | ||
|
|
||
| /** | ||
| * Get the registry that was configured. | ||
| */ | ||
| public static Registry getRegistry() { | ||
| return registry; | ||
| } | ||
|
|
||
| /** Create a gauge based on the config. */ | ||
| public static Gauge gauge(MonitorConfig config) { | ||
| return registry.gauge(createId(config)); | ||
| } | ||
|
|
||
| /** Create a max gauge based on the config. */ | ||
| public static Gauge maxGauge(MonitorConfig config) { | ||
| return registry.maxGauge(createId(config)); | ||
| } | ||
|
|
||
| /** Create a counter based on the config. */ | ||
| public static Counter counter(MonitorConfig config) { | ||
| return registry.counter(createId(config)); | ||
| } | ||
|
|
||
| /** Create a timer based on the config. */ | ||
| public static Timer timer(MonitorConfig config) { | ||
| return registry.timer(createId(config)); | ||
| } | ||
|
|
||
| /** Create a distribution summary based on the config. */ | ||
| public static DistributionSummary distributionSummary(MonitorConfig config) { | ||
| return registry.distributionSummary(createId(config)); | ||
| } | ||
|
|
||
| /** Convert servo config to spectator id. */ | ||
| public static Id createId(MonitorConfig config) { | ||
| return registry | ||
| .createId(config.getName()) | ||
| .withTags(config.getTags().asMap()); | ||
| } | ||
|
|
||
| /** Dedicated thread pool for polling user defined functions registered as gauges. */ | ||
| public static ScheduledExecutorService gaugePool() { | ||
| return GAUGE_POOL; | ||
| } | ||
|
|
||
| /** Create builder for a polled gauge based on the config. */ | ||
| public static PolledMeter.Builder polledGauge(MonitorConfig config) { | ||
| return PolledMeter.using(registry) | ||
| .withId(createId(config)) | ||
| .scheduleOn(GAUGE_POOL); | ||
| } | ||
|
|
||
| /** Register a custom monitor. */ | ||
| public static void register(Monitor<?> monitor) { | ||
| PolledMeter.monitorMeter(registry, new ServoMeter(monitor)); | ||
| } | ||
|
|
||
| /** Unregister a custom monitor. */ | ||
| public static void unregister(Monitor<?> monitor) { | ||
| PolledMeter.remove(registry, createId(monitor.getConfig())); | ||
| } | ||
|
|
||
| private static class ServoMeter implements Meter { | ||
|
|
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| private final Id id; | ||
| private final Monitor<?> monitor; | ||
|
|
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| ServoMeter(Monitor<?> monitor) { | ||
| this.id = createId(monitor.getConfig()); | ||
| this.monitor = monitor; | ||
| } | ||
|
|
||
| @Override public Id id() { | ||
| return id; | ||
| } | ||
|
|
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| private void addMeasurements(Monitor<?> m, List<Measurement> measurements) { | ||
| // Skip any that will report directly | ||
| if (!(m instanceof SpectatorMonitor)) { | ||
| if (m instanceof CompositeMonitor<?>) { | ||
| CompositeMonitor<?> cm = (CompositeMonitor<?>) m; | ||
| for (Monitor<?> v : cm.getMonitors()) { | ||
| addMeasurements(v, measurements); | ||
| } | ||
| } else { | ||
| try { | ||
| Object obj = m.getValue(); | ||
| if (obj instanceof Number) { | ||
| double value = ((Number) obj).doubleValue(); | ||
| // timestamp will get ignored as the value will get forwarded to a gauge | ||
| Measurement v = new Measurement(createId(m.getConfig()), 0L, value); | ||
| measurements.add(v); | ||
| } | ||
| } catch (Throwable t) { | ||
| LOGGER.warn("Exception while querying user defined gauge ({}), " | ||
| + "the value will be ignored. The owner of the user defined " | ||
| + "function should fix it to not propagate an exception.", m.getConfig(), t); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| @Override public Iterable<Measurement> measure() { | ||
| List<Measurement> measurements = new ArrayList<>(); | ||
| addMeasurements(monitor, measurements); | ||
| return measurements; | ||
| } | ||
|
|
||
| @Override public boolean hasExpired() { | ||
| return false; | ||
| } | ||
| } | ||
| } |
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