30 septembre 2022
Application Program Interface Api Definition
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In addition, the entire control flow of the program may be out of the control of the caller and in the hands of the frame by reversal of control or a similar mechanism. [17] [18] Hypermedia as the application state engine: After accessing a resource, the REST client must be able to use hyperlinks to detect all other actions currently available. An API can specify the interface between an application and the operating system. [19] For example, POSIX specifies a set of common APIs that are intended to enable the compilation of an application written for one POSIX-compatible operating system for another POSIX-compatible operating system. APIs have been a long-standing concept in computer programming and have been part of developers` toolsets for years. Traditionally, APIs have been used to connect code components running on the same computer. With the advent of ubiquitous networks, more and more public APIs, sometimes called open APIs, have become available. Public APIs are outward-facing and accessible over the Internet, allowing you to write code that interacts online with third-party code. This process is called API integration. In this case, the travel service interacts with the airline`s API. The API is the interface that, like your useful server, can be requested by this online travel service to get information from the airline`s database to book seats, luggage options, etc. The API will then take the airline`s response to your request and send it directly to the online travel service, which will then show you the latest and most relevant information.
A client-side Web API is a programming interface that extends the functionality of a web browser or other HTTP client. The use of the API may vary depending on the type of programming language you are using. An API for a procedural language like Lua could consist primarily of basic routines for executing code, manipulating data, or handling errors, while an API for an object-oriented language like Java would provide a specification of classes and their class methods. [13] [14] API stands for Application Programming Interface, a concept that applies everywhere from command-line tools to enterprise Java code to Ruby on Rails web applications. An API is a way to programmatically interact with a separate software component or resource. In recent years, the OpenAPI specification has become a common standard for defining REST APIs. OpenAPI establishes a language-independent way for developers to create REST API interfaces so that users can understand them with minimal guesswork. The API doesn`t need to explain what happens in the engine when you set foot on the accelerator. So if you`ve learned how to drive a car with a combustion engine, you can get behind the wheel of an electric car without having to learn a whole bunch of new skills. Information about what is happening and how is gathered in the definition of the API, which is abstract and distinct from the car itself.
APIs consist of two related elements. The first is a specification that describes how information is exchanged between programs, in the form of a request for processing and a return of the required data. The second is a software interface written to this specification and published in some way for use. This observation led to APIs that supported all types of programming, not just application programming. Until 1990, the API was defined simply as « a set of services made available to a programmer to perform certain tasks » by technologist Carl Malamud. [9] The Java API is a library of software components that is available « out of the box » to anyone who has installed the Java SDK. These components implement common tasks and typically increase productivity because programmers don`t have to start from scratch every time. One of the basic components used in the software is a so-called list, which, as you might expect, follows a list of items. The Java API defines what you can do with a list: add items, sort the list, determine if an item is in the list, and so on. It also specifies how these actions are performed.
To sort the list, you must specify how the list should be sorted: alphabetically, numerically descending, from lightest to dullest color, etc. A single API can have multiple implementations (or none because it is abstract) in the form of different libraries that use the same programming interface. Imagine the following scenario: You (e.g. Your app or client, such as a web browser or mobile app), wants to access data or features from another app. APIs as services. The tendency to view APIs as a representation of common resources has changed. Although many applications and users are expected to use APIs as a common tool, they are called services and typically require more controlled development and deployment. APIs are used to integrate new applications into existing software systems. This increases the speed of development because not every feature needs to be written from scratch. You can use APIs to take advantage of existing code. All data can be shared with an application program interface.
APIs are implemented via function calls composed of verbs and nouns. The required syntax is described in the documentation of the application called. For example, on a real estate website, one API can publish available properties by geography, while a second API provides the visitor with current interest rates and a third API provides a mortgage calculator. Good APIs facilitate the development of a computer program by providing all the building blocks that are then assembled by the programmer. In fact, APIs are often compared to Legos for this reason, as you can combine and reuse them endlessly to create new services. It would be better and easier for Twitter to provide you with a way to query their app to get this data so you can view or use it in your app. This way, it would automatically stay up to date. API documentation can be generated in a data-driven manner.
By observing many programs that use a particular API, it is possible to deduce the typical uses as well as the contracts and instructions required. [49] The models can then be used to generate natural language from the degraded data. Over the years, what an « API » is has often described each type of generic connectivity interface to an application. More recently, however, the modern API has taken on some features that make it extraordinarily valuable and useful: The server-side Web API is a programming interface that consists of one or more publicly exposed endpoints for a defined request-response message system. It is usually expressed as JSON or XML API keys that validate the program or application making the API call. They identify the application and ensure that it has the required access rights for each API call. API keys are not as secure as tokens, but they allow API monitoring to collect usage data. You may have noticed a long string and numbers in your browser`s URL when you visit different websites. This string is an API key that the website uses to make internal API calls.
The growing number of web services made available by cloud providers via APIs has also encouraged the creation of cloud-specific applications, Internet of Things (IoT) efforts, and applications to support mobile devices and users. These API types have a lower level of abstraction, which means they are more detailed. It allows the programmer to manipulate functions within an application module or hardware at a granular level. JSON can be found everywhere in modern web, mobile and IoT applications. It is readable, lightweight and works great with applications written in JavaScript as it is JavaScript. But it`s also relatively easy to have applications written in other languages to read and build, including Java. High-level APIs are those that we can usually use in REST form, where programmers have a high degree of abstraction.
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