The progress tracker API lets you model a tree of steps, along the same structure as protocols and subprotocols. Each step has an (optionally changing) label, and thus progress trackers can be arranged in a tree. Updates to the progress at each level flow up the tree via an RxJava observable (I guess we will use this more in future).
A simple console renderer is provided that uses ANSI escapes and Emoji to show animated progress through a protocol.
The trader demo is enhanced to use this framework, when run outside of Gradle.
* Dependency resolution/checking is now working on both sides of the two party trading protocol.
* The commercial paper contract was changed to check timestamping authority identities by name instead of key.
* The trader demo has been rewritten to use the protocol framework, which simplifies the code.
This commit is incomplete: only the seller side currently checks. The code will be refactored out into subprotocols in further commits.
Note that timeouts are currently unhandled.
- Use fixes in Kotlin 1.0 RC to clean up property access a bit (fewer set* calls)
- Note that we currently won't notice if Artemis throws an exception during startup, as it happens async. There is a fix to Artemis pending.
- Fix a security bug/TODO by having seller send back the signatures rather than a full blown transaction (which would allow a malicious seller to try and confuse the buyer by sending back a completely different TX to the one he proposed)
- Introduce an UntrustworthyData<T> wrapper as an (inefficient) form of taint tracking, to make it harder to forget that data has come from an untrustworthy source and may be malicious.
- Split the giant {Buyer, Seller}.call() methods into a set of smaller methods that make it easier to unit test various kinds of failure/skip bits in tests that aren't needed.
Acted upon comments from last pull request.
Added an interface to enable the usage of the same tests for both the Kotlin and Java example CommercialPaper class - did appropriate refactoring to enable.
Added javadoc, removed public modifier from interfaces.
Various fixes from code review comments.
It uses Artemis (an embeddable MQ broker) and can run in either a 'serving' mode, in which case it will sit around waiting to sell fake commercial paper assets, or a 'buying' mode in which case it will connect to a specified serving node and run the two party trade protocol.
Most services are either mocked out or too trivial to be useful at this point. They will be fleshed out in the future.
