Abstract: The described technology is directed towards an object-oriented programming (OOP) system and library that maps conventional object-oriented concepts such as class hierarchies, interfaces, and static methods and properties onto a prototypal object system such as JavaScript®. Various functions of the OOP system are called to create a class-like structure that is instantiated into an object instance upon request. The OOP system allows for use of a wrapper pattern to wrap selected objects with added functionality such as validation and tracing, and to provide enhanced functionality with respect to properties, such as to call a function associated with a property when the property's value changes, and/or to lazily generate property values only when accessed.

Abstract: The described technology is directed towards a platform-independent user interface (UI) system. Views and other objects at the platform-independent UI system level perform layout, scrolling, virtualization, styling, data binding via data models and/or readiness. Input handling and output to a display tree are also performed at this level. An abstraction layer processes the display tree into function calls to objects of the underlying platform to render visible output.

Abstract: The described technology is directed towards sharing asynchronous (async) tasks between task chains, including in a way that prevents cancellation of lower-level chain entity from cancelling a shared async task. A shared async task is wrapped in multiplexer code that maintains lower-level entity identities as a set of listeners of the shared async task, and when a listener cancels, only removes that listener from the set of listeners so that the shared async task does not cancel as long as one listener remains in the set. Also described is optimization to share an async task, and wrapping tasks in cancel-checking code that prevents the task from running its work if the task is intended to be cancelled but is queued to run before the cancel request is queued to run.

Abstract: The described technology is directed towards server-controlled testing and/or monitoring of a client device application program. The server loads plug-in components directed towards the testing and/or monitoring operations, and instructs the client device to couple counterpart plug-in components to the client device application program. The server's plug-in components communicate with the application program's plug-in components to run the testing and/or monitoring operations, which may be automated, send queries to the client to receive responses, and send commands to the client to take actions. The server includes dashboards for interacting with the client device. The client device includes virtual input devices that allow the server to inject input into the client application program.

Abstract: The described technology is directed towards a structured logging technology in which events corresponding to program execution are received in a structured format and logged based upon filtering of those events. A log handler is associated with a filtering mechanism that determines whether each event matches filtering criteria and is thus to be logged by the log handler. The log handler provides matching logged events to an event sink, such as an analytic tool that consumes the events for analysis.