| /* |
| * 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 util |
| |
| import ( |
| "golang.org/x/net/context" |
| "sync" |
| "time" |
| ) |
| |
| var GlobalPoolConfig = &PoolConfig{ |
| Concurrent: 1000, |
| WaitTimeout: time.Second, |
| IdleTimeout: 60 * time.Second, |
| } |
| |
| type PoolConfig struct { |
| Concurrent int |
| WaitTimeout time.Duration |
| IdleTimeout time.Duration |
| } |
| |
| type GoRoutine struct { |
| ctx context.Context |
| cancel context.CancelFunc |
| wg sync.WaitGroup |
| mux sync.RWMutex |
| closed bool |
| task chan func(ctx context.Context) |
| concurrent chan struct{} |
| } |
| |
| func (g *GoRoutine) execute(f func(ctx context.Context)) { |
| defer RecoverAndReport() |
| f(g.ctx) |
| } |
| |
| func (g *GoRoutine) Do(f func(context.Context)) { |
| defer RecoverAndReport() |
| select { |
| case g.task <- f: |
| return |
| case g.concurrent <- struct{}{}: |
| go g.loop(f) |
| } |
| } |
| |
| func (g *GoRoutine) loop(f func(context.Context)) { |
| g.wg.Add(1) |
| defer g.wg.Done() |
| defer func() { <-g.concurrent }() |
| |
| timer := time.NewTimer(GlobalPoolConfig.IdleTimeout) |
| defer timer.Stop() |
| for { |
| g.execute(f) |
| |
| select { |
| case <-timer.C: |
| return |
| case f = <-g.task: |
| if f == nil { |
| return |
| } |
| ResetTimer(timer, GlobalPoolConfig.IdleTimeout) |
| } |
| } |
| } |
| |
| func (g *GoRoutine) Close(wait bool) { |
| g.mux.Lock() |
| if g.closed { |
| g.mux.Unlock() |
| return |
| } |
| g.closed = true |
| g.mux.Unlock() |
| |
| close(g.task) |
| close(g.concurrent) |
| g.cancel() |
| if wait { |
| g.Wait() |
| } |
| } |
| |
| func (g *GoRoutine) Wait() { |
| g.wg.Wait() |
| } |
| |
| var defaultGo *GoRoutine |
| |
| func init() { |
| defaultGo = NewGo(context.Background()) |
| } |
| |
| func Go(f func(context.Context)) { |
| defaultGo.Do(f) |
| } |
| |
| func GoCloseAndWait() { |
| defaultGo.Close(true) |
| Logger().Debugf("all goroutines exited") |
| } |
| |
| func NewGo(ctx context.Context) *GoRoutine { |
| ctx, cancel := context.WithCancel(ctx) |
| gr := &GoRoutine{ |
| ctx: ctx, |
| cancel: cancel, |
| task: make(chan func(context.Context)), |
| concurrent: make(chan struct{}, GlobalPoolConfig.Concurrent), |
| } |
| return gr |
| } |