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* CORDA-3669 Do not execute `ExecuteAsyncOperation` multiple times When a `FlowExternalOperation` or `FlowExternalAsyncOperation` executes and completes a flag (`isFlowResumed`) is switched to true. This flag was used inside of `DoRemainingWorkTransition` to decide whether to skip over the execution of an event. Since this flag was being switched to true when the external operation's future completed, it was possible for _unexpected_ events to be placed in the fiber's queue that would retrigger the `FlowIORequest.ExecuteAsyncOperation`, that is held as the checkpoint's next `FlowIORequest`to process. By using the existing `StateMachineState.isTransactionTracked` (and renaming it to `isWaitingForFuture`) we can decide to not process the `FlowIORequest.ExecuteAsyncOperation` if it has already been called before. This moves this code path in line with `FlowIORequest.WaitForLedgerCommit`. Random `DoRemainingWork` events can now be pushed to the fiber's queue without causing the `FlowIORequest.ExecuteAsyncOperation` to execute again.
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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