| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.druid.emitter.dropwizard; |
| |
| import com.codahale.metrics.Gauge; |
| import com.codahale.metrics.Metric; |
| import com.codahale.metrics.MetricRegistry; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.github.benmanes.caffeine.cache.Cache; |
| import com.github.benmanes.caffeine.cache.Caffeine; |
| import com.google.common.base.Joiner; |
| import com.google.common.collect.ImmutableList; |
| import org.apache.druid.java.util.common.ISE; |
| import org.apache.druid.java.util.common.StringUtils; |
| import org.apache.druid.java.util.common.logger.Logger; |
| import org.apache.druid.java.util.emitter.core.Emitter; |
| import org.apache.druid.java.util.emitter.core.Event; |
| import org.apache.druid.java.util.emitter.service.AlertEvent; |
| import org.apache.druid.java.util.emitter.service.ServiceMetricEvent; |
| |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| public class DropwizardEmitter implements Emitter |
| { |
| private static final Logger log = new Logger(DropwizardEmitter.class); |
| private final MetricRegistry metricsRegistry; |
| private final AtomicBoolean started = new AtomicBoolean(false); |
| private final DropwizardConverter converter; |
| private final List<Emitter> alertEmitters; |
| private final List<DropwizardReporter> reporters; |
| private final DropwizardEmitterConfig config; |
| |
| public DropwizardEmitter( |
| DropwizardEmitterConfig config, |
| ObjectMapper mapper, |
| List<Emitter> alertEmitters |
| ) |
| { |
| this.alertEmitters = alertEmitters; |
| this.config = config; |
| this.reporters = config.getReporters(); |
| this.converter = new DropwizardConverter(mapper, config.getDimensionMapPath()); |
| final Cache<String, Metric> metricsRegistryCache = Caffeine.newBuilder() |
| .recordStats() |
| .maximumSize(config.getMaxMetricsRegistrySize()) |
| .build(); |
| metricsRegistry = new MetricRegistry() |
| { |
| @Override |
| protected ConcurrentMap<String, Metric> buildMap() |
| { |
| return metricsRegistryCache.asMap(); |
| } |
| }; |
| } |
| |
| |
| @Override |
| public void start() |
| { |
| final boolean alreadyStarted = started.getAndSet(true); |
| if (!alreadyStarted) { |
| for (DropwizardReporter reporter : reporters) { |
| reporter.start(metricsRegistry); |
| } |
| } |
| } |
| |
| @Override |
| public void emit(Event event) |
| { |
| synchronized (started) { |
| if (!started.get()) { |
| throw new RejectedExecutionException("Dropwizard emitter Service not started."); |
| } |
| } |
| if (event instanceof ServiceMetricEvent) { |
| ServiceMetricEvent metricEvent = (ServiceMetricEvent) event; |
| String host = metricEvent.getHost(); |
| String service = metricEvent.getService(); |
| String metric = metricEvent.getMetric(); |
| Map<String, Object> userDims = metricEvent.getUserDims(); |
| Number value = metricEvent.getValue(); |
| ImmutableList.Builder<String> nameBuilder = new ImmutableList.Builder<>(); |
| LinkedHashMap<String, String> dims = new LinkedHashMap<>(); |
| final DropwizardMetricSpec metricSpec = converter.addFilteredUserDims(service, metric, userDims, dims); |
| |
| if (metricSpec != null) { |
| if (config.getPrefix() != null) { |
| nameBuilder.add(config.getPrefix()); |
| } |
| nameBuilder.add(StringUtils.format("metric=%s", metric)); |
| nameBuilder.add(StringUtils.format("service=%s", service)); |
| if (config.getIncludeHost()) { |
| nameBuilder.add(StringUtils.format("hostname=%s", host)); |
| } |
| dims.forEach((key, value1) -> nameBuilder.add(StringUtils.format("%s=%s", key, value1))); |
| |
| String fullName = StringUtils.replaceChar(Joiner.on(",").join(nameBuilder.build()), '/', "."); |
| updateMetric(fullName, value, metricSpec); |
| } else { |
| log.debug("Service=[%s], Metric=[%s] has no mapping", service, metric); |
| } |
| } else if (event instanceof AlertEvent) { |
| for (Emitter emitter : alertEmitters) { |
| emitter.emit(event); |
| } |
| } else { |
| throw new ISE("unknown event type [%s]", event.getClass()); |
| } |
| } |
| |
| private void updateMetric(String name, Number value, DropwizardMetricSpec metricSpec) |
| { |
| switch (metricSpec.getType()) { |
| case meter: |
| metricsRegistry.meter(name).mark(value.longValue()); |
| break; |
| case timer: |
| metricsRegistry.timer(name) |
| .update(value.longValue(), metricSpec.getTimeUnit()); |
| break; |
| case counter: |
| metricsRegistry.counter(name).inc(value.longValue()); |
| break; |
| case histogram: |
| metricsRegistry.histogram(name).update(value.longValue()); |
| break; |
| case gauge: |
| SettableGauge gauge = (SettableGauge) metricsRegistry.gauge(name, () -> new SettableGauge(value)); |
| gauge.setValue(value); |
| break; |
| default: |
| throw new ISE("Unknown Metric Type [%s]", metricSpec.getType()); |
| } |
| } |
| |
| @Override |
| public void flush() |
| { |
| for (DropwizardReporter reporter : reporters) { |
| reporter.flush(); |
| } |
| } |
| |
| @Override |
| public void close() |
| { |
| final boolean wasStarted = started.getAndSet(false); |
| if (wasStarted) { |
| for (DropwizardReporter reporter : reporters) { |
| reporter.close(); |
| } |
| } |
| } |
| |
| private static class SettableGauge implements Gauge<Number> |
| { |
| private Number value; |
| |
| public SettableGauge(Number value) |
| { |
| this.value = value; |
| } |
| |
| public void setValue(Number value) |
| { |
| this.value = value; |
| } |
| |
| @Override |
| public Number getValue() |
| { |
| return value; |
| } |
| } |
| |
| } |