The reference scenario I’m talking about in this post is represented in the figure below:ġ. The MessageBus provides a simple and robust client-side infrastructure to propagate notifications to listening UI components. connect/disconnect events, grouping connections, authorization.ĭevelopers that are currently using the Ext.NET component framework can take advantage on SignalR by combining it with the Ext.NET MessageBus component. In the ASP.NET world, SignalR is a growing new library that uses WebSockets under the covers when it’s available, and gracefully fallbacks to other techniques and technologies when it isn’t, while the application code stays the same. SignalR also provides a very simple, high-level API for doing server-to-client RPC (call JavaScript functions in clients’ browsers from server-side code) in an ASP.NET application, as well as adding useful hooks for connection management, e.g. Today, all the modern browsers and web servers fully support WebSockets and they can extabilish bi-directional and persistent communications, so that a client can receive content through a “push” action performed by the server. in progress, completed, canceled etc.) and the read model is updated, ready for queries.īefore WebSockets, the classic implementations of this kind of real-time features were not so easy and they used to adopt strategies like forever frame (see “ Comet“) or periodic/ long polling. As a consequence, in order to receive a feedback as soon as possible, all the involved clients should poll the server until the command execution reaches a significant state (e.g. In scenarios like that, the client can’t count on an updated read model just after sending the command. The server-side command processing could be performed after some hours: for example, the command could be just enqueued to a command-bus to be processed later. Just for example, let’s think to a task-based UI which submits a command like “ book a plane ticket” to a web service. Moreover, in very scalable and complex architectures, server-side code execution is often asynchronous. Most of the modern web applications provides real-time functionalities (“ real-time web“) through a set of technologies and practices that enable users to receive information as soon as it is published by its authors, rather than requiring that they or their software check a source periodically for updates. AJAX ASP.NET ASP.NET MVC Blogroll C# Compact Framework Entity Framework Java Technology Microsoft Technology Programming Silverlight Uncategorized WCF Web 2.0 Web Development Web Services Windows Forms WPF
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