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waitForNodeStartup should now throw after 2 minutes rather than 20 seconds. Some bank devs were finding integration tests failing as nodes had still not started... Added getFreeLocalPorts() for grabbing more than one port. Fixes bug in freeLocalHostAndPort() where the same port can be picked multiple times. In README.md instruct users to grab IntelliJ16 instead of 15. |
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Introduction
This source repository contains explorations of various design concepts the R3 DLG is exploring.
Things you need to know:
-
The main code documentation is in the form of a website in the git repository. There is a copy of the site online, so access the website using the username 'corda' and password 'delegato' to start reading about what's included, how to get set up, and to read a tutorial on writing smart contracts in this framework.
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The architecture documentation is on the Architecture Working Group Wiki site - please refer to that for an explanation of some of the background concepts that the prototype is exploring.
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The code is a JVM project written mostly in Kotlin, which you can think of as a simpler version of Scala (or alternatively, a much better syntax for Java). Kotlin can be learned quickly and is designed to be readable, so you won't need to know it very well to understand what the code is doing. If you'd like to add new features, please read its documentation on the website.
There is also Java code included, to demonstrate how to use the framework from a more familiar language.
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For bug tracking and project management we use JIRA. For source control we use this BitBucket repository. You should have received credentials for these services as part of getting set up. If you don't have access, please contact Richard Brown or James Carlyle.
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There will be a mailing list for discussion, brainstorming etc called r3dlg-awg.
License
This code is not yet released under a traditional open source license. Until it is, the following license applies:
Copyright Distributed Ledger Group LLC. Distributed as Licensed Company IP to DLG Group Members pursuant to the August 7, 2015 Advisory Services Agreement and subject to the Company IP License terms set forth therein. Distributed as Non-Project IP to R3 LRC Members pursuant to their respective Member and Services Agreements and subject to the Non-Project IP license terms. set forth therein. All other rights reserved.
Instructions for installing prerequisite software
JDK for Java 8
Install the Oracle JDK 8u45 or higher. It is possible that OpenJDK will also work but we have not tested with this.
Using IntelliJ
It's a good idea to use a modern IDE. We use IntelliJ. Install the latest version of IntelliJ community edition (which is free):
https://www.jetbrains.com/idea/download/
Upgrade the Kotlin plugin to the latest version (1.0-beta-2423) by clicking "Configure > Plugins" in the opening screen, then clicking "Install JetBrains plugin", then searching for Kotlin, then hitting "Upgrade" and then "Restart".
Choose "Check out from version control" and use this git URL
https://your_username@bitbucket.org/R3-CEV/r3prototyping.git
Agree to the defaults for importing a Gradle project. Wait for it to download the dependencies.
Right click on the tests directory, click "Run -> All Tests" (note: NOT the first item in the submenu that has the gradle logo next to it).
The code should build, the unit tests should show as all green.
You can catch up with the latest code by selecting "VCS -> Update Project" in the menu.
Troubleshooting
IntelliJ
If on attempting to open the project, IntelliJ refuses because SDK was not selected, do the following:
Configure -> Project Defaults -> Project Structure
on that tab:
Project Settings / Project
click on New… next to the red symbol, and select JDK. It should then pop up and show the latest JDK it has found at something like
jdk1.8.0_xx…/Contents/Home
Also select Project language level: as 8. Click OK. Open should now work.
Quasar
If you get an error about a missing Quasar agent, then your JVM is being invoked without a needed command line argument.
Make sure an argument like -javaagent:lib/quasar.jar is being passed to the invocation.
You may need/want to edit your default JUnit run config in IntelliJ to ensure that parameter is being set, along with
-Dco.paralleluniverse.fibers.verifyInstrumentation which is useful to catch mistakes. To do that, click the dropdown
in the toolbar and select "Edit configurations", then expand the defaults tree, then select JUnit and add the two
arguments to the VM options edit.
"Foo is ambiguous" error during compilation
Gradle's incremental compilation isn't always reliable. Run ./gradlew clean and then try again.
ClassNotFoundException during Gradle quasarScan task
Your Gradle build server is hosed. Run gradle --stop and then try gradle clean build.
Accessing Source Without an IDE
If you don't want to explore or modify the code in a local IDE, you can also just use the command line and a text editor:
git clone https://your_username@bitbucket.org/R3-CEV/r3prototyping.git
You will need to have your Bitbucket account set up already from R3. Then:
cd r3prototyping
Run the following to run the unit tests:
./gradlew test
For the first time only, this will download and configure Gradle. Run "git pull" to upgrade
Starting point - the Tutorial
We have prepared a comprehensive tutorial. One you have access to the source, open the following in a browser:
r3prototyping/docs/build/html/index.html
