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Sessions are now terminated after performing the original `FlowIORequest` passed into `StartedFlowTransition`, instead of before. This is done by scheduling an `Event.TerminateSessions` if there are sessions to terminate when performing a suspending event. Originally this was done by hijacking a transition that is trying to perform a `StartedFlowTransition`, terminating the sessions and then scheduling another `Event.DoRemainingWork` to perform the original transition. This introduced a bug where, another event (from a external message) could be placed onto the queue before the `Event.DoRemainingWork` could be added. In most scenarios, that should be ok. But, if a flow is retrying (while in an uninitiated state) and this occurs the flow could fail due to being in an unexpected state. Terminating the sessions after performing the original transition removes this possibility. Meaning that a restarting flow will always perform the transition they supposed to do (based on the called suspending event).
Corda
Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.
Features
- Smart contracts that can be written in Java and other JVM languages
- Flow framework to manage communication and negotiation between participants
- Peer-to-peer network of nodes
- "Notary" infrastructure to validate uniqueness and sequencing of transactions without global broadcast
- Enables the development and deployment of distributed apps called CorDapps
- Written in Kotlin, targeting the JVM
Getting started
- Read the Getting Started documentation
- Run the Example CorDapp
- Read about Corda's Key Concepts
- Follow the Hello, World! tutorial
Useful links
- Project Website
- Mailing List
- Documentation
- Stack Overflow Tag
- Slack Channel
- Meetups
- Training Courses
Contributing
Corda is an open-source project and contributions are welcome!
To find out how to contribute, please see our contributing docs.
License
Acknowledgements
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