[英]Jruby thread context instance association
I am trying to eval javascript in ruby. 我正在尝试在ruby中评估javascript。
config/initializer/initializer_context.rb
js_str =
EXEC_PP_CONTEXT = ExecJS.compile("function test_add(param) { return param.a+ param.b;}")
and then in my controller I am using : 然后在我的控制器中,我正在使用:
data_hash = {:a=>4,:b=>5}
EXEC_PP_CONTEXT.exec("return test_add(#{data_hash.to_json})")
But I occasionally get this error ( 1 in 100 requests) 但我偶尔会收到此错误(每100个请求中有1个)
can not use Context instance already associated with some thread
Stack: 堆:
If I am already setting max runtime and min runtime to 1 shouldn't it avoid this problem in first place ? 如果我已经将最大运行时间和最小运行时间设置为1,那么它是否应该首先避免此问题?
finally figured out by reading Mozilla rhino's code: https://github.com/matthieu/rhymeno/blob/master/src/org/mozilla/javascript/Context.java#LC416 最终通过阅读Mozilla Rhino的代码找到了答案: https : //github.com/matthieu/rhymeno/blob/master/src/org/mozilla/javascript/Context.java#LC416
static final Context enter(Context cx, ContextFactory factory)
Basically the method counts the number of threads that are inside the context ( using it / executing it) and if another thread tries to enter it , it throws an error. static final Context enter(Context cx, ContextFactory factory)
基本上,该方法计算上下文(使用它/执行它)内部的线程数,如果另一个线程尝试输入它,则抛出错误。
To avoid the problem and achieve concurrency , we lazily created one context per thread using ruby's Thread[:current][:some_js_context] = blah_
为了避免该问题并实现并发,我们使用ruby的Thread[:current][:some_js_context] = blah_
懒惰地为每个线程创建一个上下文
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