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12 lines
792 B
Markdown
12 lines
792 B
Markdown
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# Execution flow
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Aqua's main goal is to express how the execution flows: moves from peer to peer, forks to parallel flows and then joins back, uses data from one step in another.
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As the foundation of Aqua is based on π-calculus, finally flow is decomposed into [sequential](sequential.md) (`seq`, `.`), [conditional](conditional.md) (`xor`, `+`), [parallel](parallel.md) (`par`, `|`) computations and [iterations](iterative.md) based on data (`!P`). For each basic way to organize the flow, Aqua follows a set of rules to execute the operations:
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* What data is available for use?
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* What data is exported and can be used below?
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* How errors and failures are handled?
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These rules form a contract, as in [design-by-contract](https://en.wikipedia.org/wiki/Design\_by\_contract) programming.
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