| /** |
| * 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.bookkeeper.stats.prometheus; |
| |
| import com.google.common.base.Joiner; |
| |
| import io.prometheus.client.Collector; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import org.apache.bookkeeper.stats.Counter; |
| import org.apache.bookkeeper.stats.Gauge; |
| import org.apache.bookkeeper.stats.OpStatsLogger; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| |
| /** |
| * A {@code Prometheus} based {@link StatsLogger} implementation. |
| */ |
| public class PrometheusStatsLogger implements StatsLogger { |
| |
| private final PrometheusMetricsProvider provider; |
| private final String scope; |
| private final Map<String, String> labels; |
| |
| PrometheusStatsLogger(PrometheusMetricsProvider provider, String scope, Map<String, String> labels) { |
| this.provider = provider; |
| this.scope = scope; |
| this.labels = labels; |
| } |
| |
| @Override |
| public OpStatsLogger getOpStatsLogger(String name) { |
| return provider.opStats.computeIfAbsent(scopeContext(name), x -> new DataSketchesOpStatsLogger(labels)); |
| } |
| |
| @Override |
| public Counter getCounter(String name) { |
| return provider.counters.computeIfAbsent(scopeContext(name), x -> new LongAdderCounter(labels)); |
| } |
| |
| @Override |
| public <T extends Number> void registerGauge(String name, Gauge<T> gauge) { |
| provider.gauges.computeIfAbsent(scopeContext(name), x -> new SimpleGauge<T>(gauge, labels)); |
| } |
| |
| @Override |
| public <T extends Number> void unregisterGauge(String name, Gauge<T> gauge) { |
| // no-op |
| } |
| |
| @Override |
| public void removeScope(String name, StatsLogger statsLogger) { |
| // no-op |
| } |
| |
| @Override |
| public StatsLogger scope(String name) { |
| return new PrometheusStatsLogger(provider, completeName(name), labels); |
| } |
| |
| @Override |
| public StatsLogger scopeLabel(String labelName, String labelValue) { |
| Map<String, String> newLabels = new TreeMap<>(labels); |
| newLabels.put(labelName, labelValue); |
| return new PrometheusStatsLogger(provider, scope, newLabels); |
| } |
| |
| private ScopeContext scopeContext(String name) { |
| return new ScopeContext(completeName(name), labels); |
| } |
| |
| private String completeName(String name) { |
| return Collector.sanitizeMetricName(scope.isEmpty() ? name : Joiner.on('_').join(scope, name)); |
| } |
| } |