| // Licensed to 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. Apache Software Foundation (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 observability |
| |
| import ( |
| "sync" |
| ) |
| |
| // MetricsCollector is a global metrics collector. |
| var MetricsCollector = Collector{ |
| getters: make(map[string]MetricsGetter), |
| } |
| |
| // MetricsGetter is a function that collects metrics. |
| type MetricsGetter func() |
| |
| // Collector is a metrics collector. |
| type Collector struct { |
| getters map[string]MetricsGetter |
| gMux sync.RWMutex |
| } |
| |
| // Register registers a metrics getter. |
| func (c *Collector) Register(name string, getter MetricsGetter) { |
| c.gMux.Lock() |
| defer c.gMux.Unlock() |
| c.getters[name] = getter |
| } |
| |
| func (c *Collector) collect() { |
| c.gMux.RLock() |
| defer c.gMux.RUnlock() |
| for _, getter := range c.getters { |
| getter() |
| } |
| } |