Here’s原始代码(master branch).
Here’s具有并发性的分支(x_concurrent分支).
当我使用go run jira_open_comment_emailer.go执行并发代码时,如果将JIRA问题添加到通道here中,则延迟wg.Done()永远不会执行,这会导致我的wg.Wait()永久挂起.
这个想法是我有大量的JIRA问题,我想为每个问题分拆一个goroutine,看看它是否有我需要回应的评论.如果是这样,我想将它添加到某个结构(我在一些研究后选择了一个频道),我可以稍后从队列中读取以构建电子邮件提醒.
这是代码的相关部分:
// Given an issue,determine if it has an open comment// Returns true if there is an open comment on the issue,otherwise falsefunc getAndProcessComments(issue Issue,channel chan<- Issue,wg *sync.WaitGroup) { // Decrement the wait counter when the function returns defer wg.Done() needsReply := false // Loop over the comments in the issue for _,comment := range issue.FIElds.Comment.Comments { commentMatched,err := regexp.MatchString("~"+config.JIRAUsername,comment.Body) checkerror("Failed to regex match against comment body",err) if commentMatched { needsReply = true } if comment.Author.name == config.JIRAUsername { needsReply = false } } // Only add the issue to the channel if it needs a reply if needsReply == true { // This never allows the defered wg.Done() to execute? channel <- issue }}func main() { start := time.Now() // This retrIEves all issues in a search from JIRA allissues := getFullissueList() // Initialize a wait group var wg sync.WaitGroup // Set the number of waits to the number of issues to process wg.Add(len(allissues)) // Create a channel to store issues that need a reply channel := make(chan Issue) for _,issue := range allissues { go getAndProcessComments(issue,channel,&wg) } // Block until all of my goroutines have processed their issues. wg.Wait() // Only send an email if the channel has one or more issues if len(channel) > 0 { sendEmail(channel) } fmt.Printf("Script ran in %s",time.Since(start))}goroutines阻止发送到无缓冲的通道.
解决goroutines的最小变化是创建一个缓冲通道,其容量适用于所有问题:
channel := make(chan Issue,len(allissues))
并在调用wg.Wait()后关闭通道.
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