For C#-properties this can be achieved by writing directly onto the (usually invisible) backing field of a non-public property. In some object-oriented programming languages such as C# and Java, reflection can be used to bypass member accessibility rules. Reflection is also a key strategy for metaprogramming. Reflection is often used as part of software testing, such as for the runtime creation/instantiation of mock objects. It also allows instantiation of new objects and invocation of methods. In object-oriented programming languages such as Java, reflection allows inspection of classes, interfaces, fields and methods at runtime without knowing the names of the interfaces, fields, methods at compile time. This is typically accomplished by dynamically assigning program code at runtime. A reflection-oriented program component can monitor the execution of an enclosure of code and can modify itself according to a desired goal of that enclosure. Reflection can be used for observing and modifying program execution at runtime. Languages without reflection such as C are required to use auxiliary compilers for tasks like Abstract Syntax Notation to produce code for serialization and bundling. For example, it assists languages such as Java to operate well in networks by enabling libraries for serialization, bundling and varying data formats. Reflection makes a language more suited to network-oriented code. Reflection helps programmers make generic software libraries to display data, process different formats of data, perform serialization or deserialization of data for communication, or do bundling and unbundling of data for containers or bursts of communication.Įffective use of reflection almost always requires a plan: A design framework, encoding description, object library, a map of a database or entity relations. īrian Cantwell Smith's 1982 doctoral dissertation introduced the notion of computational reflection in procedural programming languages and the notion of the meta-circular interpreter as a component of 3-Lisp. As the bulk of programming moved to higher-level compiled languages such as Algol, Cobol, Fortran, Pascal, and C, this reflective ability largely disappeared until new programming languages with reflection built into their type systems appeared. The earliest computers were programmed in their native assembly languages, which were inherently reflective, as these original architectures could be programmed by defining instructions as data and using self-modifying code. I didn't want to ask for new methods on the reflection API but the beans API creating PropertyDescriptor instance produce ones for records that expose record components as effectively read-only properties.Not to be confused with Reflection (computer graphics). Obviously I have been imprecise about why I am asking for. > On Jan 18, 2020, at 12:16 PM, Oliver Drotbohm wrote: Is this something you’d be interested in working on? I could imagine getBeanIntrospector on a record invoking the constructor with stopClass= and maybe a flag that says “hey, we’ve got a record here, also mine the components for property descriptions.” This should fit fairly cleanly into the beans model. OK, that makes more sense - if you’re already going through Introspector for ordinary classes, it would not be very difficult to make Introspector understand records. Next message: Reflection APIs for records.Previous message: Reflection APIs for records.Reflection APIs for records Brian Goetz brian.goetz at
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