i just want to make a class that inherited from Attribute class to put attribute tags in every method in my project to write the method name , Class name that have this method , date and time of calling , parameters and method's return ( if it's return something ).
i create a table in SQL Server that will receive all log information and sign it ..
i have done all the methods & query that interact with my database ( except Date & Time method) , the only problem is i don't know how to use it with Attribute way to get the information i have mention.
If you want logging with attributes, you may use PostSharp that modifies IL during compilation of your code and puts your logging codes before/after the method that you put your custom attribute derived from PostSharp's attributes (aspects)(AOP).
I think you can not do this only by use of custom attributes, because as I know custom attributes are instantiated only when Type.GetCustomAttributes() is called. So you may have to do some reflection business for sending your logs through your attributes that I don't recommend.
Instead of attributes, you can simply use AOP through a third party tool. You can use Castle Dynamic Proxy 's interceptor.
You can also log with attributes by using Interception in Castle Windsor.
To do this, you create a class that inherits from IInterceptor, register it with your container, then you can add an attribute to any class or method you want to add the logging behaviour to.
I've written an explanation here:
http://www.paulsodimu.co.uk/Post/Aspect-Oriented-Programming-Using-Castle-Windsor
And I've created a sample on GitHub to show how its done:
https://github.com/PaulSodimu/LoggingAopCastle
Related
I have a PASOE Business Class Entity setup as a Web Service. I'm trying to determine how to create a custom header that will allow me to pass in a hashed token. Is this something that I need to upgrade to 11.7.4 for DOH(OpenEdge.Web.DataObject.DataObjectHandler)? Or is this something that I simply add into a method that's defined in the class? Apologies, for the lack of code to illustrate my situation, but I'm not sure where to begin.
If you're using a Business Entity with the web transport then you're using the DOH, and the below applies. If you're using the rest transport then you are not using the DOH, and are more limited in your choices.
There is doc available on the DOH at https://documentation.progress.com/output/oe117sp/index.html#page/gssp4/openedge-data-object-handler.html - it's for 11.7.4 but largely applies to all versions (that is, from 11.6.3+). This describes the JSON mapping file, which you'll need to create an override to the default, generated one.
If you want to use the header's value for all operations, then you may want to use one of the DOH's events. There's an example of event handlers at https://github.com/PeterJudge-PSC/http_samples/blob/master/web_handler/data_object_handler/DOHEventHandler.cls ; you will need to start that handler in a session startup procedure using new DOHEventHandler() (the way that code is written is that it makes itself a singleton).
You can now add handling code for the Invoking event which fires before the business logic is run.
If you want to pass the header value into the business logic you will need to
Copy the generated mapping file <service>.gen to a <service.map> , in the same folder. "gen" files are generated and will be overwritten by the tooling
In the .map file, add a new arg entry. This must be in the same order as the parameters to the BE's method.
The JSON should look something like the below. this will read the value of the header and pass it as an input parameter into the method.
{ "ablName": "<parameter_name>",
"ablType": "CHARACTER",
"ioMode": "INPUT",
"msgElem": {"type": "HEADER", "name": "<http-header-name>"}
}
I work on a Peoplesoft project and I am struggling with Peoplecode.
I want to create an object with a dynamic classname within Peoplecode. Kind of like in Java. This would look like something like this :
&my_object = create My_Application_Package : Class_string_name()
&my_object.commonMethodCall();
where "Class_string_name" would be dynamic. Is this possible ?
And do I mandatoraly need to create an interface for all the concerned classes ?
Any help or advise is welcomed
Thanks
Finally, it is quite simple.
I just used CreateObject function :
CreateObject(str_class_name, create_par, . . .)
Where str_class_name either:
—identifies a class by class name
—identifies a class of OLE Automation object in the form:
app_name.object_name
Description
Use the CreateObject function to return an instance of a class. You
can use this function to access an Application Class, a PeopleCode
built-in object (like a chart), or an OLE Automation object.
If the class you are creating requires values to be passed, use the
create_par parameters to supply them, or use the CreateObjectArray
function.
Considerations Using Application Classes
You can use the CreateObject function to access an Application Class.
You would want to do this when you were programming at a high-level,
when you might not know the name of the class you wanted to access
until runtime. You must specify a fully-qualified class name. In
addition, the class name is case-sensitive.
The returned object has the type of class you specified.
I have a class which I load via dependency injection within Symfony 2.
It has a number of default private variables which I can override with setters.
Problem is, once one of those default values are set to something else within a page, there is no way to set it back automatically.
I don't want to call the class again using new as it removes the usefulness of the dependency injection.
So, does Symfony2 support Object LifeStyle, or do I basically need to write a public function which resets all of the defaults back to normal and call it each time it is required.
As an example, I use a class to get remote files. It has defaults for UserAgent, Accepted Language/Encoding, Method etc. But if I set the Method to POST, instead of the default GET for one call in a page, the next time I call it, it is still POST, where as I wish it to be the default GET once more, which it would be if I used new instead of via dependency injection.
Add scope: prototype to your service definition. This will ensure you get a new instance from the container each time you request your class. And of course the instance will have the default values.
http://symfony.com/doc/current/cookbook/service_container/scopes.html
Basically I want to make my script service only serialise properties that are not null on an array of object I am returning... So this..
{"k":"9wjH38dKw823","s":10,"f":null,"l":null,"j":null,"p":null,"z":null,"i":null,"c":null,"m":0,"t":-1,"u":2}
would be
{"k":"9wjH38dKw823","s":10,"m":0,"t":-1,"u":2}
Does anyone know if this is possible?
Basically the reason for this is because null values are for unchanged properties. A local copy is kept in the javascript that is just updated to reduce traffic to the server. Change values are then merged.
You can create a custom JavaScriptConverter class for the JSON serialization process to use to handle your object, and then put the necessary logic in the Serialize method of that class to exclude the properties that are null.
This article has a clear step-by-step discussion of the process involved in creating it.
You probably would not need to actually implement the Deserialize method (can throw a NotImplementedException) if you are not passing that type of object in as an input parameter to your web services.
I am creating a custom route by subclassing RouteBase. I have a dependency in there that I'd like to wire up with IoC. The method GetRouteData just takes HttpContext, but I want to add in my unit of work as well....somehow.
I am using StructureMap, but info on how you would do this with any IoC framework would be helpful.
Well, here is our solution. Many little details may be omitted but overall idea is here. This answer may be a kind of offtop to original question but it describes the general solution to the problem.
I'll try to explain the part that is responsible for plain custom HTML-pages that are created by users at runtime and therefore can't have their own Controller/Action. So the routes should be either somehow built at runtime or be "catch-all" with custom IRouteConstraint.
First of all, lets state some facts and requirements.
We have some data and some metadata about our pages stored in DB;
We don't want to generate a (hypothetically) whole million of routes for all of existing pages beforehand (i.e. on Application startup) because something can change during application and we don't want to tackle with pushing the changes to global RouteCollection;
So we do it this way:
1. PageController
Yes, special controller that is responsible for all our content pages. And there is the only action that is Display(int id) (actually we have a special ViewModel as param but I used an int id for simplicity.
The page with all its data is resolved by ID inside that Display() method. The method itself returns either ViewResult (strongly typed after PageViewModel) or NotFoundResult in case when page is not found.
2. Custom IRouteConstraint
We have to somewhere define if the URL user actually requested refers to one of our custom pages. For this we have a special IsPageConstraint that implements IRouteConstraint interface. In the Match() method of our constraint we just call our PageRepository to check whether there is a page that match our requested URL. We have our PageRepository injected by StructureMap. If we find the page then we add that "id" parameter (with the value) to the RouteData dictionary and it is automatically bound to PageController.Display(int id) by DefaultModelBinder.
But we need a RouteData parameter to check. Where we get that? Here comes...
3. Route mapping with "catch-all" parameter
Important note: this route is defined in the very end of route mappings list because it is very general, not specific. We check all our explicitly defined routes first and then check for a Page (that is easily changeable if needed).
We simply map our route like this:
routes.MapRoute("ContentPages",
"{*pagePath}",
new { controller = "Page", action = "Display" }
new { pagePath = new DependencyRouteConstraint<IsPageConstraint>() });
Stop! What is that DependencyRouteConstraint thing appeared in mapping? Well, thats what does the trick.
4. DependencyRouteConstraint<TConstraint> class
This is just another generic implementation of IRouteConstraint which takes the "real" IRouteConstraint (IsPageConstraint) and resolves it (the given TConstraint) only when Match() method called. It uses dependency injection so our IsPageConstraint instance has all actual dependencies injected!
Our DependencyRouteConstraint then just calls the dependentConstraint.Match() providing all the parameters thus just delegating actual "matching" to the "real" IRouteConstraint.
Note: this class actually has the dependency on ServiceLocator.
Summary
That way we have:
Our Route clear and clean;
The only class that has a dependency on Service Locator is DependencyRouteConstraint;
Any custom IRouteConstraint uses dependency injection whenever needed;
???
PROFIT!
Hope this helps.
So, the problem is:
Route must be defined beforehand, during Application startup
Route's responsibility is to map the incoming URL pattern to the right Controller/Action to perform some task on request. And visa versa - to generate links using that mapping data. Period. Everything else is "Single Responsibility Principle" violation which actually led to your problem.
But UoW dependencies (like NHibernate ISession, or EF ObjectContext) must be resolved at runtime.
And that is why I don't see the children of RouteBase class as a good place for some DB work dependency. It makes everything closely coupled and non-scalable. It is actually impossible to perform Dependency Injection.
From now (I guess there is some kind of already working system) you actually have just one more or less viable option that is:
To use Service Locator pattern: resolve your UoW instance right inside the GetRouteData method (use CommonServiceLocator backed by StructureMap IContainer). That is simple but not really nice thing because this way you get the dependency on static Service Locator itself in your Route.
With CSL you have to just call inside GetRouteData:
var uow = ServiceLocator.Current.GetService<IUnitOfWork>();
or with just StructureMap (without CSL facade):
var uow = ObjectFactory.GetInstance<IUnitOfWork>();
and you're done. Quick and dirty. And the keyword is "dirty" actually :)
Sure, there is much more flexible solution but it needs a few architectural changes. If you provide more details on exactly what data you get in your routes I can try to explain how we solved our Pages routing problem (using DI and custom IRouteConstraint).