7b10e92819
* Fixed AbstractNode to load custom notary services properly. Added a custom notary sample. * Prevent multiple custom notaries from being loaded * Throw if more than once custom notary service is loaded
1.7 KiB
Writing a custom notary service (experimental)
Warning
Customising a notary service is still an experimental feature and not recommended for most use-cases. Currently, customising Raft or BFT notaries is not yet fully supported. If you want to write your own Raft notary you will have to implement a custom database connector (or use a separate database for the notary), and use a custom configuration file.
Similarly to writing an oracle service, the first step is to create a service class in your CorDapp and annotate it with @CordaService. The Corda node scans for any class with this annotation and initialises them. The custom notary service class should provide a constructor with two parameters of types AppServiceHub and PublicKey.
../../samples/notary-demo/src/main/kotlin/net/corda/notarydemo/MyCustomNotaryService.kt
The next step is to write a notary service flow. You are free to copy and modify the existing built-in flows such as ValidatingNotaryFlow, NonValidatingNotaryFlow, or implement your own from scratch (following the NotaryFlow.Service template). Below is an example of a custom flow for a validating notary service:
../../samples/notary-demo/src/main/kotlin/net/corda/notarydemo/MyCustomNotaryService.kt
To enable the service, add the following to the node configuration:
- notary : {
validating : true # Set to false if your service is non-validating custom : true
}