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Every method in this event handler CFC that has an access of public is automatically exposed as a runnable event in ColdBox and it will be auto-registered for you. If an external event handler has the same name as an internal conventions event, the internal conventions event will take precedence.
At application startup, the framework registers all the valid event handler CFCs in these locations (plus handlers inside of modules).
As discussed in the introduction, events are determined via a special variable that can be sent in via the FORM or URL or REMOTELY. Ok, so now that we know how we can determine what event to execute, how do we write the events since they are used by convention? This will tell the framework too look for the main.cfc and execute the index() action method. This will tell the framework too look for the blog directory and then for the main.cfc and execute the entry() method. Important: If you use the URL event syntax notation you will be binded to the location of your handler CFC and the name of the action methods.
Private events have an access type of private and can only be called from within the application by using the runEvent() method.
If you use the no inheritance approach, your CFCs will be mixed in a decorated at runtime to receive all the functionality of our core Base Event Handler.
Since ColdBox is built with a solid cache foundation, CacheBox, your handlers can also be cached in the default cache provider. The setting in your ConfigurationCFC that should be false in development and true in production is HandlerCaching.
It is imperative that you realize that there is a great object model behind every event handler that will enable you to do your work more efficiently. Each event handler can also exhibit several feature properties that can be tuned to alter the behavior of the local AOP interception points, event caching and HTTP method security.
Event handlers do not necessarily need constructors as they are already constructed by ColdBox. As we discussed before a handler CFC contains several methods or actions that can be executed by the framework by incoming requests or internally. If you do not remember what the request context object is, here is a short recap or you can refer to the RequestContext guide. The incoming URL, FORM and REMOTE variables are merged into a single structure that we call the request collection and since we love objects that collection is stored in an object called Request Context. The request context object has tons of methods to help you in setting and getting variables from one layer to another, to getting request metadata, rendering RESTful content, setting HTTP headers and more.
Also note that the rc and prc references each method receives are sent for convenience so you can interact with the structures instead of through the event object's methods. We all need values in our applications, and that is why we will interact with the request context in order to place data from our model layer so our views can display it or retreive data from a user's request.
We would recommend you use the private request collection for setting manual data and using the standard request collection for reading the user's request variables. Important : The most important paradigm shift from procedural to an MVC framework is that you NO LONGER will be talking to URL, FORM, REQUEST or any ColdFusion scope from within your handlers, layouts and views. The event object is the object that will let you set the views that you want to render, so please explore its API in the CFC Docs.
The view name is the name of the template in the views directory without appending the .cfm. To cache the contents of a view you can specify cache=true when setting the view in your handler. Data can be passed from your handler to the view via the rc or prc (request collection and private request collection).
We recommend that you maintain a consistent naming and location schema between views and your handler and actions, often called implicit views. This method tells the framework that this request will not produce any output, so just finalize the request.
The framework provides you with a method that you can use to relocate to other events thanks to the framework super type object, the grand daddy of all things ColdBox.
It is extremely important that you use this method when relocating instead of the native ColdFusion methods as it allows you to gracefully relocate to other events or external URIs. The name of the event or SES pattern to relocate to, if not passed, then it will use the default event found in your configuration file.
A comma-delimited list of request collection key names that will be flash persisted in the framework's flash RAM and re-inflated in the next request. A structure of key-value pairs that will be flash persisted in the framework's flash RAM and re-inflated in the next request. The ColdBox FlashRAM capabilities are discussed in this guide in much more detail, so we welcome you to go there and digest it after this guide. Important: Please note that the persist argument refers to items ALREADY in the request collection. You can also use the event.renderData() method to render and marshal data directly from an event handler without the need to set a view for rendering.

There is also a pdfArgs argument in the render data method that can take in a structure of name-value pairs that will be used in the cfdocument (See docs) tag when generating the PDF. Where you need to param the incoming format extension, then do a switch and do some code for marshalling data into several formats. With this convention you can create virtual events that do not even need to be created or exist in a handler. This event has an extra argument: missingAction which is the missing action that was requested. As you can see from my sample code, I can use the onError() method to provide uniform error handling for event handlers.
We have a complete guide dedicated to Model Integration but we wanted to review a little here since event handlers need to talk to the model layer all the time. ColdBox offers its own dependency injection framework, WireBox, which allows you by convention to talk to your model objects. Your event handlers can be autowired with dependencies from either WireBox, ColdSpring, or any custom object factory by means of our injection DSL. It will be your choice to pick an approach, but we mostly concentrate on property injection as you will see from our examples. The other approach to integrating with model objects is to request them and use them as associations. Association defines a relationship between classes of objects that allows one object instance to cause another to perform an action on its behalf. In this practical example we will see how to integrate with our model layer via WireBox, injections and also requesting the objects.
So by convention, I can create a property and annotate it with a inject attribute and ColdBox will look for that model object by name in the model folder, create it, persist it, wire it and return it. Both approaches do exactly the same, in all reality getModel() does a wirebox.getInstance(), it is a facade method that is easier to remember. As you can see, the best performance is due to injection as the handler object was wired and ready to roll, while the requested approach needed the dependency to be requested. This will try to match incoming variable names to setters or properties in your domain objects and then populate them for you. In the dump you will see that the name and email properties have been binded, cool it works. We also have the ability to validate forms and objects using our awesome Validation framework called ValidBox. There are also several simple implicit AOP interceptors that can be declared in your event handler that the framework will use in order to execute them anytime an event is fired from the current handler.
With this interceptor you can intercept local event actions and execute things before the requested action executes. With this interceptor you can intercept local event actions and execute things after the requested action executes. These event handlers carry the task of controlling your application flow, calling business logic, preparing a display to a user and pretty much controlling flow. This will be a dot notation path or instantiation path where more external event handlers can be found (You can use coldfusion mappings). Once the event variable is set and detected by the framework, the framework will tokenize the event string to retrieve the CFC and action call and validate it against the internal registry of registered events.
This is ok for small or administrative applications, but not for public facing or enterprise apps as if you refactor them, all your URLs change.
This is an optional attribute and if it is not used, the framework defaults to the default object timeout in the cache settings.
This is an optional attribute and if it is not used, the framework defaults to the default last access object timeout in the cache settings.
You can name these methods in any way you like as long as they make sense, naming is important for readability.
We also create a secondary collection called the private request collection that cannot be affected by the outside world as nothing is merged into it. What this means, is that if the framework detects that an incoming event has no action attached to it, it should look for a method in that handler called index.
This way a clear distinction can be made on what was sent from the user and what was set by your code.
The request collection already has URL, FORM and REQUEST scope capabilities, so leverage it. For that, we invite you to check out the Layouts-Views Layouts and Views guide after this one.
If you want to pass data to a view without polluting rc and prc, can pass it directly in as the args parameter.
The framework gives you a method in the event object that you can use if maybe this specific request should just terminate gracefully and not render anything at all. By graceful, we mean it does a lot more behind the scenes like making sure the flash scope is persisted, logging, post processing interceptions can occurr and safe relocations.
This is a great way to pass in arguments to really control the way PDF's are generated uniformly.

ColdBox will figure out how to deal with all the passed in formats for you that renderdata can use. Every time an event requests an action from an event handler and that action does not exists in the handler, the framework will check if an onMissingAction() method has been declared. You can then do any kind of logic against this missing action and decide to do internal processing, error handling or anything you like.
If any type of runtime error ocurrs in an event handler and this method exists, then the framework will call your onError() method so you can process the error.
However, you have a flash object reference available in your variables scope that is ready for usage for all your flashing needs (Ok, don't take that line out of context please). By autowiring dependencies into event handlers, they will become part of the life span of the event handlers and thus gain on the performance that an event handler is wired with all necessary parts upon creation. Just like that we can interact with our model layer without worrying about creating the objects, persisting them and even wiring them. Again, there are cases where you need to request objects such as transient or volatile stored objects. To use these beauties you can either go to the wirebox reference directly or use the BeanFactory plugin. You can do it globally by using the preHandler() method or targeted to a specific action pre{actionName}(). You can do it globally by using the postHandler() method or targeted to a specific action post{actionName}(). Now, if you need a little refresher on what is MVC and how to apply it, read our MVC tutorial.
This is encouraged on large applications so you can section off or package handlers logically and get better maintenance and URL experience. Of course, you can change this by updating the EventName setting in your configuration file. It then continues to instantiate the event handler CFC or retrieve it from cache, and then finally executes the event handler's action method.
Therefore, we highly encourage the use of ColdBox URL Mappings that will allow you to map custom URLs to executing events. By default handlers WILL BE cached for performance, unless you specifically use the cache meta data attributes to tell the framework NOT to cache it.
You can place a 0 (Zero) in order to tell the framework to cache the handler for the entire application timeout controlled by coldfusion.
This tells the framework that if the object has not been accessed in X amount of minutes, then purge it. By convention it will use the name of the incoming event as the view that will be rendered for HTML and PDF; implicit views. The power of this convention method is extraordinary, you have tons of possibilities as you can create virtual events on specific event handlers. Read the FlashRAM guide for in-depth training and also visit the API Docs for the latest Flash RAM API.
That is exactly all the benefits that dependency injection and model integration bring to the table.
Yes, you got that right, Aspect Oriented Programming just for you and without all the complicated setup involved! If you are not familiar with ColdFusion components, you will have to get to speed in their usage in order to use ColdBox. If you get to the point where your application needs even more decoupling and separation, please consider building ColdBox Modules instead. You also might want to disable handler caching as well so you can see your changes as you develop. If no event name is detected as an incoming variable, the framework will look in the configuration settings for the DefaultEvent and use that instead (Also set in your configuration file).
Caching of handlers simulates persistence, so remember this if you are planning handlers that can maintain their own persistence and ALWAYS ALWAYS var scope your function variables. However, the event object should not be discarded as it has some pretty cool and funky methods of its own. The data argument can be either the full binary of the PDF or simple values to be rendered out as a PDF, like views, layouts, strings, etc. We would recommend requesting objects if they are transient objects or stored in some other volatile storage scope.
As you can see from the diagram, ColdBox captures an incoming variable called event and uses it to execute the correct event handler CFC and action method. Retreiving of objects is ok, but if you will be dealing with mostly singleton objects or objects that are created only once, you will gain much more performance by using injection.

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