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A controller tracks at least one Kubernetes resource type.These objectshave a spec field that represents the desired state. Thecontroller(s) for that resource are responsible for making the currentstate come closer to that desired state.
When the Job controller sees a new task it makes sure that, somewherein your cluster, the kubelets on a set of Nodes are running the rightnumber of Pods to get the work done.The Job controller does not run any Pods or containersitself. Instead, the Job controller tells the API server to create or removePods.Other components in thecontrol planeact on the new information (there are new Pods to schedule and run),and eventually the work is done.
After you create a new Job, the desired state is for that Job to be completed.The Job controller makes the current state for that Job be nearer to yourdesired state: creating Pods that do the work you wanted for that Job, so thatthe Job is closer to completion.
The important point here is that the controller makes some changes to bring aboutyour desired state, and then reports the current state back to your cluster's API server.Other control loops can observe that reported data and take their own actions.
In the thermostat example, if the room is very cold then a different controllermight also turn on a frost protection heater. With Kubernetes clusters, the controlplane indirectly works with IP address management tools, storage services,cloud provider APIs, and other services byextending Kubernetes to implement that.
As a tenet of its design, Kubernetes uses lots of controllers that each managea particular aspect of cluster state. Most commonly, a particular control loop(controller) uses one kind of resource as its desired state, and has a differentkind of resource that it manages to make that desired state happen. For example,a controller for Jobs tracks Job objects (to discover new work) and Pod objects(to run the Jobs, and then to see when the work is finished). In this casesomething else creates the Jobs, whereas the Job controller creates Pods.
There can be several controllers that create or update the same kind of object.Behind the scenes, Kubernetes controllers make sure that they only pay attentionto the resources linked to their controlling resource.
For example, you can have Deployments and Jobs; these both create Pods.The Job controller does not delete the Pods that your Deployment created,because there is information (labels)the controllers can use to tell those Pods apart.
The Deployment controller and Job controller are examples of controllers thatcome as part of Kubernetes itself ("built-in" controllers).Kubernetes lets you run a resilient control plane, so that if any of the built-incontrollers were to fail, another part of the control plane will take over the work.
You can find controllers that run outside the control plane, to extend Kubernetes.Or, if you want, you can write a new controller yourself.You can run your own controller as a set of Pods,or externally to Kubernetes. What fits best will depend on what that particularcontroller does.
If you use Stimulus for Rails with an import map or Webpack together with the @hotwired/stimulus-webpack-helpers package, your application will automatically load and register controller classes following the conventions above.
The afterLoad method will get called as soon as the controller has been registered, even if no controlled elements exist in the DOM. The function will be called bound to the original controller constructor along with two arguments; the identifier that was used when registering the controller and the Stimulus application instance.
If you need controllers to communicate with each other, you should use events. The Controller class has a convenience method called dispatch that makes this easier. It takes an eventName as the first argument, which is then automatically prefixed with the name of the controller separated by a colon. The payload is held in detail. It works like this:
If for some reason it is not possible to use events to communicate between controllers, you can reach a controller instance via the getControllerForElementAndIdentifier method from the application. This should only be used if you have a unique problem that cannot be solved through the more general way of using events, but if you must, this is how:
In their final design, a model represents some part of the program purely and intuitively. A view is a visual representation of a model, retrieving data from the model to display to the user and passing requests back and forth between the user and the model. A controller is an organizational part of the user interface that lays out and coordinates multiple Views on the screen, and which receives user input and sends the appropriate messages to its underlying Views. This design also includes an Editor as a specialized kind of controller used to modify a particular view, and which is created through that view.[6]
Smalltalk-80 supports a version of MVC that evolved from this one.[6] It provides abstract view and controller classes as well as various concrete subclasses of each that represent different generic widgets. In this scheme, a View represents some way of displaying information to the user, and a controller represents some way for the user to interact with a view. A view is also coupled to a model object, but the structure of that object is left up to the application programmer. The Smalltalk-80 environment also includes an "MVC Inspector", a development tool for viewing the structure of a given model, view, and controller side-by-side. [9]
In 1988, an article in The Journal of Object Technology (JOT) by two ex-PARC employees presented MVC as a general "programming paradigm and methodology" for Smalltalk-80 developers. However, their scheme differed from both Reenskaug et al.'s and that presented by the Smalltalk-80 reference books. They defined a view as covering any graphical concern, with a controller being a more abstract, generally invisible object that receives user input and interacts with one or many views and only one model.[10]
With Rails and Django, the role of the view is played by HTML templates, so in their scheme a view specifies an in-browser user interface rather than representing a user interface widget directly.[23][24] (Django opts to call this kind of object a "template" in light of this.[25]) This approach puts relatively less emphasis on small, composable views; a typical Rails view has a one-to-one relationship with a controller action.[26]
Smalltalk-80 views communicate with both a model and a controller,[27] whereas with WebObjects, a view talks only to a controller, which then talks to a model.[28] With Rails and Django, a view/template is used by a controller/view when preparing a response to the client.[29][30]
A Smalltalk-80 controller handles user input events, such as button presses or mouse movement.[32] At any given time, each controller has one associated view and model, although one model object may hear from many different controllers. Only one controller, the "active" controller, receives user input at any given time; a global window manager object is responsible for setting the current active controller. If user input prompts a change in a model, the controller will signal the model to change, but the model is then responsible for telling its views to update.[33]
In WebObjects, the views handle user input, and the controller mediates between the views and the models. There may be only one controller per application, or one controller per window. Much of the application-specific logic is found in the controller.[34]
In Rails, requests arriving at the on-server application from the client are sent to a "router", which maps the request to a specific method of a specific controller. Within that method, the controller interacts with the request data and any relevant model objects and prepares a response using a view. Conventionally, each view has an associated controller; for example, if the application had a client view, it would typically have an associated Clients controller as well. However, developers are free to make other kinds of controllers if they wish.[35]
Django calls the object playing this role a "view" instead of a controller.[30] A Django view is a function that receives a web request and returns a web response. It may use templates to create the response.[36]
Although originally developed for desktop computing, MVC has been widely adopted as a design for World Wide Web applications in major programming languages. Several web frameworks have been created that enforce the pattern. These software frameworks vary in their interpretations, mainly in the way that the MVC responsibilities are divided between the client and server.[42] Early MVC frameworks took a thin client approach that placed almost the entire model, view and controller logic on the server. In this approach, the client sends hyperlink requests or form submissions to the controller and then receives a complete and updated web page (or other document) from the view; the model exists entirely on the server.[42] Later frameworks have allowed the MVC components to execute partly on the client, using Ajax to synchronize data.
The controller read-only property of the ServiceWorkerContainer interface returns a ServiceWorker object if its state is activating or activated (the same object returned by ServiceWorkerRegistration.active). This property returns null if the request is a force refresh (Shift + refresh) or if there is no active worker.
\n The controller read-only\n property of the ServiceWorkerContainer interface returns a\n ServiceWorker object if its state is activating or\n activated (the same object returned by\n ServiceWorkerRegistration.active). This property returns\n null if the request is a force refresh (Shift + refresh) or if\n there is no active worker.\n
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