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https://gitee.com/milvus-io/milvus.git
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114 lines
2.8 KiB
Go
114 lines
2.8 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package timerecord
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import (
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"sync"
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"time"
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)
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// groups maintains string to GroupChecker
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var groups sync.Map
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// GroupChecker checks members in same group silent for certain period of time
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// print warning msg if there are item(s) that not reported
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type GroupChecker struct {
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groupName string
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d time.Duration // check duration
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t *time.Ticker // internal ticker
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ch chan struct{} // closing signal
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lastest sync.Map // map member name => lastest report time
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initOnce sync.Once
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stopOnce sync.Once
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fn func(list []string)
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}
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// init start worker goroutine
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// protected by initOnce
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func (gc *GroupChecker) init() {
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gc.initOnce.Do(func() {
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gc.ch = make(chan struct{})
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go gc.work()
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})
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}
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// work is the main procedure logic
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func (gc *GroupChecker) work() {
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gc.t = time.NewTicker(gc.d)
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var name string
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var ts time.Time
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for {
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select {
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case <-gc.t.C:
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case <-gc.ch:
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return
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}
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var list []string
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gc.lastest.Range(func(k, v interface{}) bool {
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name = k.(string)
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ts = v.(time.Time)
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if time.Since(ts) > gc.d {
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list = append(list, name)
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}
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return true
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})
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if len(list) > 0 && gc.fn != nil {
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gc.fn(list)
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}
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}
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}
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// Check updates the latest timestamp for provided name
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func (gc *GroupChecker) Check(name string) {
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gc.lastest.Store(name, time.Now())
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}
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// Remove deletes name from watch list
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func (gc *GroupChecker) Remove(name string) {
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gc.lastest.Delete(name)
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}
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// Stop closes the GroupChecker
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func (gc *GroupChecker) Stop() {
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gc.stopOnce.Do(func() {
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close(gc.ch)
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groups.Delete(gc.groupName)
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})
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}
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// GetGroupChecker returns the GroupChecker with related group name
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// if no exist GroupChecker has the provided name, a new instance will be created with provided params
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// otherwise the params will be ignored
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func GetGroupChecker(groupName string, duration time.Duration, fn func([]string)) *GroupChecker {
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gc := &GroupChecker{
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groupName: groupName,
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d: duration,
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fn: fn,
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}
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actual, loaded := groups.LoadOrStore(groupName, gc)
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if !loaded {
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gc.init()
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}
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gc = actual.(*GroupChecker)
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return gc
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}
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