分度器の遅延実行elementArrayFinder.map

Question

分度器のelementArrayFinderのmap関数を呼び出すと、子要素のArrayArrayFinderの評価が必要になるのを待つ$$の動作とは異なる、DOMをすぐに検索してマップする要素を見つけます元の要素とその子孫の両方を見つけることができます。

マップ関数の実行を遅らせる必要があるのは、抽象化の目的でテストファイル以外のファイルに事前定義したいからです。私が持っている現在の試行は、次のとおりです。

Question.array = function(elementArrayFinder) { 

    function delayedPromise(executor) { 
    this.executor = executor; 
    } 

    delayedPromise.prototype.then = function(onFulfilled, onRejected) { 
    console.log('locating elements'); 
    return (new Promise(this.executor)).then(onFulfilled, onRejected); 
    }; 

    return new delayedPromise(function(resolve, reject) { 
    elementArrayFinder.map(function(omniTask) { 
     return new Question(omniTask); 
    }).then(resolve, reject); 
    }); 
}; 

これは、しばらくの間、働いていたが、私は（この関数を含むファイル、この関数はしばらく変更されていないではない）は、今日のテストファイルを再構築する場合は、JavaScriptが始まりましたこの機能に関連するメモリの問題を持っている：

<--- Last few GCs ---> 

    133580 ms: Mark-sweep 1354.3 (1421.2) -> 1354.3 (1437.2) MB, 2608.1/0.0 ms [allocation failure] [GC in old space requested]. 
    136052 ms: Mark-sweep 1354.3 (1437.2) -> 1354.3 (1437.2) MB, 2471.9/0.0 ms [allocation failure] [GC in old space requested]. 
    138829 ms: Mark-sweep 1354.3 (1437.2) -> 1355.7 (1421.2) MB, 2775.8/0.0 ms [last resort gc]. 
    141436 ms: Mark-sweep 1355.7 (1421.2) -> 1357.0 (1421.2) MB, 2606.6/0.0 ms [last resort gc]. 


<--- JS stacktrace ---> 

==== JS stack trace ========================================= 

Security context: 0x13c845cfb51 <JS Object> 
    1: enqueue [/Users/thasisclaus/omnistack/node_modules/selenium-webdriver/lib/promise.js:~2742] [pc=0x27de9185871b] (this=0x2b9531847931 <an EventEmitter with map 0x17526dabf9e9>,task=0x17b6b944f181 <a Deferred with map 0x17526dac0649>) 
    2: addCallback_ [/Users/thasisclaus/omnistack/node_modules/selenium-webdriver/lib/promise.js:~1328] [pc=0x27de919c1a75] (this=0x17b6b944eeb9 <a ManagedPro... 

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory 
1: node::Abort() [/usr/local/bin/node] 
2: node::FatalException(v8::Isolate*, v8::Local<v8::Value>, v8::Local<v8::Message>) [/usr/local/bin/node] 
3: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [/usr/local/bin/node] 
4: v8::internal::Factory::NewFixedArray(int, v8::internal::PretenureFlag) [/usr/local/bin/node] 
5: v8::internal::Handle<v8::internal::TypeFeedbackMetadata> v8::internal::TypeFeedbackMetadata::New<v8::internal::FeedbackVectorSpec>(v8::internal::Isolate*, v8::internal::FeedbackVectorSpec const*) [/usr/local/bin/node] 
6: v8::internal::(anonymous namespace)::EnsureFeedbackVector(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
7: v8::internal::(anonymous namespace)::GenerateBaselineCode(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
8: v8::internal::(anonymous namespace)::GetUnoptimizedCodeCommon(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
9: v8::internal::Compiler::Compile(v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Compiler::ClearExceptionFlag) [/usr/local/bin/node] 
10: v8::internal::Accessors::FunctionLengthGetter(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&) [/usr/local/bin/node] 
11: v8::internal::PropertyCallbackArguments::Call(void (*)(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&), v8::internal::Handle<v8::internal::Name>) [/usr/local/bin/node] 
12: v8::internal::Object::GetPropertyWithAccessor(v8::internal::LookupIterator*) [/usr/local/bin/node] 
13: v8::internal::Object::GetProperty(v8::internal::LookupIterator*) [/usr/local/bin/node] 
14: v8::internal::Builtin_Impl_FunctionPrototypeBind(v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)0>, v8::internal::Isolate*) [/usr/local/bin/node] 
15: v8::internal::Builtin_FunctionPrototypeBind(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/local/bin/node] 
16: 0x27de909092a7 
17: 0x27de9185871b 
18: 0x27de919c1a75 
19: 0x27de919c202c 
20: 0x27de912d1b27 
21: 0x27de90909895 
22: 0x27de912dee53 
>> FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory 
>> 1: node::Abort() [/usr/local/bin/node] 
>> 2: node::FatalException(v8::Isolate*, v8::Local<v8::Value>, v8::Local<v8::Message>) [/usr/local/bin/node] 
>> 3: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [/usr/local/bin/node] 
>> 4: v8::internal::Factory::NewFixedArray(int, v8::internal::PretenureFlag) [/usr/local/bin/node] 
>> 5: v8::internal::Handle<v8::internal::TypeFeedbackMetadata> v8::internal::TypeFeedbackMetadata::New<v8::internal::FeedbackVectorSpec>(v8::internal::Isolate*, v8::internal::FeedbackVectorSpec const*) [/usr/local/bin/node] 
>> 6: v8::internal::(anonymous namespace)::EnsureFeedbackVector(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
>> 7: v8::internal::(anonymous namespace)::GenerateBaselineCode(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
>> 8: v8::internal::(anonymous namespace)::GetUnoptimizedCodeCommon(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
>> 9: v8::internal::Compiler::Compile(v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Compiler::ClearExceptionFlag) [/usr/local/bin/node] 
>> 10: v8::internal::Accessors::FunctionLengthGetter(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&) [/usr/local/bin/node] 
>> 11: v8::internal::PropertyCallbackArguments::Call(void (*)(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&), v8::internal::Handle<v8::internal::Name>) [/usr/local/bin/node] 
>> 12: v8::internal::Object::GetPropertyWithAccessor(v8::internal::LookupIterator*) [/usr/local/bin/node] 
>> 13: v8::internal::Object::GetProperty(v8::internal::LookupIterator*) [/usr/local/bin/node] 
>> 14: v8::internal::Builtin_Impl_FunctionPrototypeBind(v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)0>, v8::internal::Isolate*) [/usr/local/bin/node] 
>> 15: v8::internal::Builtin_FunctionPrototypeBind(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/local/bin/node] 
>> 16: 0x27de909092a7 
>> 17: 0x27de9185871b 
>> 18: 0x27de919c1a75 
>> 19: 0x27de919c202c 
>> 20: 0x27de912d1b27 
>> 21: 0x27de90909895 
>> 22: 0x27de912dee53 

私は今日変更テストファイルのコンテキストは次のとおりです。エラーは、実際にCAUであれば

fit('Should have the right number of assignment questions initially', function(done) { 
     var done = browserHelper.strictDone(done), 
      self = this; 

     self.communityQuestions = self.myQuestions = []; 

     console.log(self.assignmentQuestions.length, self.communityQuestions.length, self.myQuestions.length) 

     assignmentPage.assignmentQuestions.then(function(assignmentQuestions) { 
     expect(assignmentQuestions.length).toEqual(self.assignmentQuestions.length); 

     assignmentPage.communityQuestionsTab.click(); 

     assignmentPage.communityQuestions.then(function(communityQuestions) { 
      expect(communityQuestions.length).toEqual(self.communityQuestions.length); 

      assignmentPage.myQuestionsTab.click(); 

      assignmentPage.myQuestions.then(function(myQuestions) { 
      console.log(myQuestions); 

      expect(myQuestions.length).toEqual(self.myQuestions.length); 

      done(); 
      }); 
     }); 
     }); 
    }); 

は私は知りませんその関数が遭遇した何らかの外部的な変更によって引き起こされる。いずれにしても、マップ機能を遅らせるにはおそらく、プロトラクターのコントロールフローと直接対話する方が良いと思います。

Answer 1

私は（代わりに私は要素から構築されたオブジェクトを返していました）マップで要素を返していなかったにもかかわらず、私はこれは、マップがハングアップする、このエラーに関連していると思う：https://github.com/angular/protractor/issues/2227

を、それを回避するために、私はちょうどmapをreduceに変更し、それに応じて渡された機能を変更しました。これは完全に機能しました。

私はmapがreduceとlodash関数とは異なり、mapは最後の引数がコレクションされていため、古い慣習に従っていないので、機能を反復少ない更新elementArrayFinderの一つであるかなり確信しています。