| /* |
| * 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 catalog |
| |
| import ( |
| "sync" |
| ) |
| |
| type Heartbeats struct { |
| instances map[Instance]struct{} |
| sync.Mutex |
| } |
| |
| func NewHeartbeats() *Heartbeats { |
| return &Heartbeats{ |
| instances: map[Instance]struct{}{}, |
| } |
| } |
| |
| func (h *Heartbeats) ResetAndCollect() []Instance { |
| h.Lock() |
| currentInstances := h.instances |
| h.instances = map[Instance]struct{}{} |
| h.Unlock() |
| var instances []Instance |
| for k := range currentInstances { |
| instances = append(instances, k) |
| } |
| return instances |
| } |
| |
| func (h *Heartbeats) Add(instance Instance) { |
| h.Lock() |
| h.instances[instance] = struct{}{} |
| h.Unlock() |
| } |
| |
| func (h *Heartbeats) Remove(instance Instance) { |
| h.Lock() |
| delete(h.instances, instance) |
| h.Unlock() |
| } |