Node.js 事件流:在哪里设置 MaxListeners?

问题描述

我已经搜索并搜索了这个，但无济于事.我已经梳理了网络(包括 Stackoverflow)和 Node 文档以寻找答案，但没有找到一个有效的答案(也许这对我来说只是不好的搜索).我正在处理 gulp 配置文件中的事件流，并且我有一个特定的任务正在从 EventEmitter 类中遇到经典的检测到内存泄漏"错误.根据我的发现，处理这个问题的答案似乎是调用 EventEmitter 类的 setMaxListeners 方法；我的研究表明事件流有一个 Stream 对象，它应该是 EventEmitter 的一个实例.但是，无论我尝试调用 setMaxListeners 的方式，我都找不到方法.在精疲力尽地研究这个问题之后，我想我会把它带到这里的节点专家那里(我假设这很简单，我只是错过了一些东西).这是我的代码:

I have searched and searched for this, to no avail. I've combed the web (including Stackoverflow), and the Node docs for an answer, and not found one---that worked (maybe that's just bad searching on my part). I'm working with an event-stream in a gulp config file, and I have a particular task that is hitting the classic "memory leak detected" error from the EventEmitter class. From what I've found, the answer to dealing with this issue seems to be to call the setMaxListeners method of the EventEmitter class; and my research has suggested that the event-stream has a Stream object, which should be an instance of EventEmitter. However, what ever way I try to call setMaxListeners, I get method not found. After exhausting myself researching the issue, I figured I'd bring it to the Node gurus here (I'm assuming this is simple, and I'm just missing something). Here's my code:

return eventStream.merge(
        gulp.src('./jscript/libs/file-one.js'),
        gulp.src('./jscript/libs/filder_one/file-two.js'),
        gulp.src('./jscript/libs/folder_two/file-three.js'),
        gulp.src('./jscript/libs/folder_three/file_four.js'),
        gulp.src('./jscript/libs/folder_four/file_five.js'),
        gulp.src('./jscript/libs/folder_five/file_six.js'), 
        gulp.src('./jscript/libs/file_seven.js'),
        gulp.src('./jscript/libs/file_eight.js'),
        gulp.src('./jscript/lists/rules/*.js')
    )        
    .pipe(concat('my_file.js'))
    .pipe(gulp.dest('./jscript/dist/'))
    .pipe(rename('my_file.min.js'))
    .pipe(uglify())
    .pipe(gulp.dest('./jscript/dist/'));

谢谢！

推荐答案

这不是您问题的直接答案，但是您可以将 glob 模式数组传递给 'gulp.src()' 而不是合并多个 'gulp.src() 的.不解决你的问题吗?

This is not a direct answer to your question, but you can pass an array of glob patterns to 'gulp.src()' instead of merging multiple 'gulp.src()'s. Doesn't it solve your problem?

https://github.com/gulpjs/gulp/blob/master/docs/API.md#gulpsrcglobs-options

编辑

作为直接答案，以下内容对我有用:

As a direct answer, the following worked for me:

var merged = eventStream.merge(...);
merged.setMaxListeners(0);
return merged.pipe(...);

虽然在合并函数中添加了事件侦听器，但似乎在事件循环的滴答声之间检查了侦听器计数.所以我们可以在添加监听器后立即设置MaxListeners.

While event listeners are added in the merge function, the listener count seems to be checked between ticks of the event loop. So we can setMaxListeners right after adding listeners.

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