CorDapp Training Project

This is an example CorDapp that simulates an environment where market data providers can sell access to their market data using third-party redistributors. Subscribers can source data from multiple providers with complete transparency to all parties.

TODO

• Better discovery/distribution of data sets
• Implement the revoking of permissions
• Better billing support
• Updating prices and T&Cs
• On ledger payments

Pre-Requisites

See https://docs.corda.net/getting-set-up.html.

Usage

Running tests inside IntelliJ

We recommend editing your IntelliJ preferences so that you use the Gradle runner - this means that the quasar utils plugin will make sure that some flags (like -javaagent - see below) are set for you.

To switch to using the Gradle runner:

• Navigate to Build, Execution, Deployment -> Build Tools -> Gradle -> Runner (or search for runner)
  • Windows: this is in "Settings"
  • MacOS: this is in "Preferences"
• Set "Delegate IDE build/run actions to gradle" to true
• Set "Run test using:" to "Gradle Test Runner"

If you would prefer to use the built in IntelliJ JUnit test runner, you can run gradlew installQuasar which will copy your quasar JAR file to the lib directory. You will then need to specify -javaagent:lib/quasar.jar and set the run directory to the project root directory for each test.

Running the nodes

See https://docs.corda.net/tutorial-cordapp.html#running-the-example-cordapp.

Corda Kotlin Shell

There's a Corda Kotlin Shell extension script in scripts/market_data.kts. It contains some helper functions.

There's two functions that offer a step-through lifecycle:

• demo1() - Step through the setup and sharing of all states right up to permission and usage
• demo2() - After running demo1(), demo2 steps through the process of creating a 'paid-for' usage - i.e. one where the subscriber is already paying for access to data through another redistributor

To step through each flow in the functions, press the key and wait for a response.