gitee.com/go-spring2/spring-base@v1.1.3/log/queue/queue.go (about)

     1  /*
     2   * Copyright 2012-2019 the original author or authors.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *      https://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package queue
    18  
    19  import "sync"
    20  
    21  const (
    22  	MaxEventCount = 10000
    23  )
    24  
    25  var (
    26  	inst *queue
    27  	once sync.Once
    28  )
    29  
    30  type Event interface {
    31  	OnEvent()
    32  }
    33  
    34  type queue struct {
    35  	ring chan Event
    36  }
    37  
    38  func get() *queue {
    39  	once.Do(func() {
    40  		inst = &queue{
    41  			ring: make(chan Event, MaxEventCount),
    42  		}
    43  		inst.consume()
    44  	})
    45  	return inst
    46  }
    47  
    48  func Publish(e Event) bool {
    49  	return get().publish(e)
    50  }
    51  
    52  func (q *queue) publish(e Event) bool {
    53  	select {
    54  	case q.ring <- e:
    55  		return true
    56  	default:
    57  		return false
    58  	}
    59  }
    60  
    61  func (q *queue) consume() {
    62  	go func() {
    63  		for {
    64  			if e := <-q.ring; e != nil {
    65  				e.OnEvent()
    66  			}
    67  		}
    68  	}()
    69  }