Paradigm | multi-paradigm: object-oriented, distributed, Dataflow |
---|---|
Designed by | E. Dean Tribble |
First appeared | 1996 |
Typing discipline | untyped |
Influenced by | |
Concurrent Logic Programming, Actors | |
Influenced | |
E |
Joule is a capability-secure massively-concurrent dataflow programming language, designed for building distributed applications. [1] It is so concurrent that the order of statements within a block is irrelevant to the operation of the block. Statements are executed whenever possible, based on their inputs. Everything in Joule happens by sending messages. There is no control flow. Instead, the programmer describes the flow of data, making it a dataflow programming language.[ citation needed ]
Joule development started in 1994 at Agorics in Palo Alto, California. [2] It is considered the precursor to the E programming language. [3] [4]
Numerals consist of ASCII digits 0–9; identifiers are Unicode sequences of digits, letters, and operator characters that begin with a letter. It is also possible to form identifiers by using Unicode sequences (including whitespace) enclosed by either straight (' ') or standard (‘ ’) single quotes, where the backslash is the escape character. Keywords have to start with a letter, except the • keyword to send information. Operators consist of Unicode sequences of digits, letters, and operator characters, beginning with an operator character. Labels are identifiers followed by a colon (':'). [5]
At the root, Joule is an imperative language and because of that a statement-based language. It has a rich expression syntax, which transforms easily to its relational syntax underneath. Complex expressions become separate statements, where the site of the original expression is replaced by a reference to the acceptor of the results channel. Therefore, nested expressions still compute completely concurrently with their embedding statement. [5]
If amount <= balance • account withdraw: amount else • account report-bounce: end
An identifiers may name a channel to communicate with the server. If this is the case, it is said to be bound to that channel. [5]
C is a general-purpose computer programming language. It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems, device drivers, protocol stacks, though decreasingly for application software, and is common in computer architectures that range from the largest supercomputers to the smallest microcontrollers and embedded systems.
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Although it can be used for programming, writing functions, and performing processes, its greatest strength is the ability to easily create domain-specific languages or dialects
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(help)E's debt to Joule cannot be overstated.
The E programming language was largely inspired by the language Joule, currently being developed by Dean Tribble, Norm Hardy, and their colleagues at Agorics, Inc.
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