Dependency Injection: Separating the Call Graph from the Construction Graph -


I'm trying to exercise, and I'm having some difficulty doing this.

I is a function that periodically visits my database, retrieves a list of products, and then sets the battery of tests against those products to determine their security.

If one or more products are found to be unsafe, I need to memorize an ProductRecall object immediately and remotely.

The function looks something like this: (pseudo-code) 

  void SafteyInspector :: CheckProductSaftey () {database.getProducts (list_of_products) foreach (list_up_products p) {if ( RunBatteryOfTests (p)) unsafe_products.insert (p); } If (unsafe products!). ()) {ProductRecall * Recon = New ProductRecall (unsafe_products); // Oh no! Recall-> Despatch (); }}

The problem is that I am "new" - a ProductRecall object in the middle of my call-graph is correct, this dependency violates the principles of injection is. In writing, I can not test without compiling CheckProductSaftey () also ProductRecall .

However, I have my security inspector in the product type << code> object, because safety inspector is the list of unsafe products that determine Does.

I'm using manufacturer-injection for everything, and I would like to continue doing this. Also note that I can issue more than one product record at any given time, so I only assign a single ProductRecall object to SecurityInspector Can not make it in construction.

Any suggestions? Thanks!

I think the problem may be with your implementation of ProductRecall Specifically, if you can call the dispatch () on a newly created object, it shows that the actual functionality is hidden in either the ProductRecall class , Or to give stable members and / or singles to the permanent members to give it and everything else in the product cluster class.

I would recommend creating a class called ProductRecallDispatcher which handles the complexities of one, the real dispatch, then you can make one of these objects, and SafteyInspector Can pass the constructor to. This will make your CheckProductSafety function as follows: 

  void SafteyInspector :: CheckProductSaftey () {database.getProducts (list_of_products) foreach (list_of_products p) {if ( ! RunBatteryOfTests (p)) Unsafe_products.instate (p); } If (unsafe products!). ()}}

Comments

Post a Comment

Popular posts from this blog

python - Overriding the save method in Django ModelForm -

I'm having trouble overriding a ModelForm save method. I get this error I'm: Exception type: TypeErier Exception Value: Save () found an unexpected keyword argument 'committed' My intentions include a form 3 fields Submit several values ​​for, then create an object for each combination of those areas, and to save each object file models.py class collarsult type (models.Model): id = model. AutoField (db_column = 'icontact_result_code_type_id', primary_key = true) callResult = models.ForeignKey ( 'CallResult', db_column = 'icontact_result_code_id') campaign = models.ForeignKey ( 'campaign', db_column = 'icampaign_id') CALLTYPE = models.ForeignKey ( 'CALLTYPE', db_column = 'icall_type_id') agent = models.BooleanField (db_column = 'bagent', default = true) teamLeader = models.BooleanField (db_column = 'bTeamLeader', default = true) active = models.BooleanField (db_column = Django.form...
Read more

html - CSS autoheight, but fit content to height of div -

I have a div in which there are three children- div in the left and middle div: float: left while true: float: true because it is my layout Actually will spoil, I've used ClearFix Hack: .cf {zoom: 1; }. Cf: First,. Cf: {content: ""; Display: Table; }. Cf: After {clear: both; } It still works, but I want to be the right div an indicator. So it should fill 100% of the parent unit of height. How can I complete this? PS is the full code: & Lt; / Div & gt; & Lt; Div class = "mobile_content" & gt; & Lt; H5 & gt; {{Data.titel}} & lt; / H5> & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Komponist: & lt; / Th & gt; & Lt; TD & gt; {{Data.komponist}} & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Th & gt; Instrument: & lt; / Th & gt; & Lt; TD & gt; {{Data.instrumente}} & lt; / TD & gt; & Lt; / TR & gt;...
Read more

qt - How to prevent QAudioInput from automatically boosting the master volume to 100%? -

I have been trying to use Qt5 multimedia to record audio with QAudioInput, however, when I see If QAudioInput is started, it increases the master volume of my sound device to 100%. How can I prevent QAudioInput from changing the master volume? My current development platform is Linux with PalsAdio (with flat audio disabled). How can I use QAudioInput : QAudioDeviceInfo device_info = QAudioDeviceInfo :: defaultInputDevice (); QAudio format format; Format.setSampleRate (44100); Format.setChannelCount (1); Format.setSampleSize (16); Format.setCodec ("Audio / PCM"); Format.setSampleType (QAudioFormat :: SignedInt); Format.setByteOrder (QAudioFormat :: LittleEndian); Std :: cout & lt; & Lt; Device_info.deviceName (). ToUtf8 (). ConstData () & lt; & Lt; Std :: endl; QAudioInput * default_device = new QAudioInput (device_info, format); QIODevice * default_io_device = default_device-> Start (); a QAudioInput.setVolume () method is not you I ...
Read more