1// Copyright (c) 2012 - Cloud Instruments Co., Ltd.
2//
3// All rights reserved.
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7//
8// 1. Redistributions of source code must retain the above copyright notice, this
9//    list of conditions and the following disclaimer.
10// 2. Redistributions in binary form must reproduce the above copyright notice,
11//    this list of conditions and the following disclaimer in the documentation
12//    and/or other materials provided with the distribution.
13//
14// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
15// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
18// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24
25package seelog
26
27import (
28	"errors"
29	"time"
30)
31
32// asyncTimerLogger represents asynchronous logger which processes the log queue each
33// 'duration' nanoseconds
34type asyncTimerLogger struct {
35	asyncLogger
36	interval time.Duration
37}
38
39// NewAsyncLoopLogger creates a new asynchronous loop logger
40func NewAsyncTimerLogger(config *logConfig, interval time.Duration) (*asyncTimerLogger, error) {
41
42	if interval <= 0 {
43		return nil, errors.New("async logger interval should be > 0")
44	}
45
46	asnTimerLogger := new(asyncTimerLogger)
47
48	asnTimerLogger.asyncLogger = *newAsyncLogger(config)
49	asnTimerLogger.interval = interval
50
51	go asnTimerLogger.processQueue()
52
53	return asnTimerLogger, nil
54}
55
56func (asnTimerLogger *asyncTimerLogger) processItem() (closed bool) {
57	asnTimerLogger.queueHasElements.L.Lock()
58	defer asnTimerLogger.queueHasElements.L.Unlock()
59
60	for asnTimerLogger.msgQueue.Len() == 0 && !asnTimerLogger.Closed() {
61		asnTimerLogger.queueHasElements.Wait()
62	}
63
64	if asnTimerLogger.Closed() {
65		return true
66	}
67
68	asnTimerLogger.processQueueElement()
69	return false
70}
71
72func (asnTimerLogger *asyncTimerLogger) processQueue() {
73	for !asnTimerLogger.Closed() {
74		closed := asnTimerLogger.processItem()
75
76		if closed {
77			break
78		}
79
80		<-time.After(asnTimerLogger.interval)
81	}
82}
83