The server itself can’t push data to the client without the client first making a request. Typical communication between a client and server is done using HTTP and requires that the client makes a request for data from the server. WebSocket ServerĪ WebSocket server and client library are useful components for a chat app. This article talks about Chat APIs, their features and how they work in more detail. All these functionalities are built into CometChat’s SDKs and Chat APIs. For example, authentication, profile settings and notification settings can all be managed through a REST API. Chat Rest APIĪ Chat REST API is most often used to facilitate the functionality of the chat app outside of messaging. The chat server’s resources can include a REST API, a WebSocket server, an AWS instance for media storage, etc. This server, or pool of servers, is responsible for securely receiving a message, identifying the correct recipient, queuing the message and then forwarding the message to the recipient's chat client. The chat server is just that, a server (or usually many many servers) that hosts all the software, frameworks and databases necessary for the chat app to operate. When you type a message and hit send, the chat client transmits that message to the other major component: the chat server. Interactions include sending push notifications, displaying data to the user and storing messages and files. A desktop, web or smartphone chat application, the chat client is responsible for interacting with the operating system (i.e. ServletContainer: 200: success.The chat client is what the user experiences. ServletContainer: validateEntry() -> ServletContainer ServletContainer: 200: enterText.jsp -> Browserīrowser: POST: enterText.jsp(text) -> ServletContainer ServletContainer: 200: index.jsp ->Browserīrowser: GET enterText.jsp -> ServletContainer So, for your example, it might be something like: Browser: GET index.jsp -> ServletContainer I don't usually model the user in this process - the point is usually not to model the user interaction (which buttons they click etc.) however, I do include relevant JavaScript functions which execute in the browser (e.g. "redirect", or "authentication required", I like to include these too. Where the application uses status codes - e.g. It also helps to think about the type of HTTP command you issue for each request - GET, POST etc., and which requests require authentication or state. Visual Paradigm introduction to write your first Sequence DiagramĪs web applications are built using HTTP request/response pairs, I find that it helps to capture this in sequence diagrams. Below are some examples and tutorials will definitely help. OF course you can minimize the steps by decreasing actors number but for learning and simplicity that will be a very good solution. Here you can find that there's a probability that user isn't registered, then there's something called "Alternative paths". Keep returning the response to the user and loads your page on his browser. Our next step will be defining the "Call Messages" and "Return Messages" between our actors.Ī message defines a particular communication between Lifelines of anĪs per your events mentioned, we will try to break it down a little more to explain them better. In your system, we could say that the Actors are ( User, Web browser, Web server (Application, Content database) ). Several different actors and, conversely, a given actor may be played Thus, a single physical instance may play the role of Of some entity that is relevant to the specification of its associated Specific physical entity but merely a particular facet (i.e., "role") Note that an actor does not necessarily represent a The subject (e.g., by exchanging signals and data), but which isĮxternal to the subject (i.e., in the sense that an instance of anĪctor is not a part of the instance of its corresponding subject).Īctors may represent roles played by human users, external hardware, When defining an "Actor" you should know that definitionĪn Actor models a type of role played by an entity that interacts with
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