mirror of
https://github.com/corda/corda.git
synced 2024-12-21 13:57:54 +00:00
294 lines
12 KiB
HTML
294 lines
12 KiB
HTML
|
|
|
|
<!DOCTYPE html>
|
|
<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
|
|
<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
|
|
<head>
|
|
<meta charset="utf-8">
|
|
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
|
|
<title>Where to start — R3 Corda latest documentation</title>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="_static/css/custom.css" type="text/css" />
|
|
|
|
|
|
|
|
|
|
|
|
<link rel="top" title="R3 Corda latest documentation" href="index.html"/>
|
|
<link rel="next" title="Writing a contract" href="tutorial-contract.html"/>
|
|
<link rel="prev" title="Interest Rate Swaps" href="contract-irs.html"/>
|
|
|
|
|
|
<script src="_static/js/modernizr.min.js"></script>
|
|
|
|
</head>
|
|
|
|
<body class="wy-body-for-nav" role="document">
|
|
|
|
<div class="wy-grid-for-nav">
|
|
|
|
|
|
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
|
|
<div class="wy-side-scroll">
|
|
<div class="wy-side-nav-search">
|
|
|
|
|
|
|
|
|
|
<a href="index.html" class="icon icon-home"> R3 Corda
|
|
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
|
|
<div class="version">
|
|
latest
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div role="search">
|
|
<form id="rtd-search-form" class="wy-form" action="search.html" method="get">
|
|
<input type="text" name="q" placeholder="Search docs" />
|
|
<input type="hidden" name="check_keywords" value="yes" />
|
|
<input type="hidden" name="area" value="default" />
|
|
</form>
|
|
</div>
|
|
|
|
|
|
<br>
|
|
<a href="api/index.html">API reference</a>
|
|
|
|
</div>
|
|
|
|
<div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
|
|
|
|
|
|
|
|
<p class="caption"><span class="caption-text">Overview</span></p>
|
|
<ul>
|
|
<li class="toctree-l1"><a class="reference internal" href="inthebox.html">What’s included?</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="getting-set-up.html">Getting set up</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="data-model.html">Data model</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="transaction-data-types.html">Data types</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="consensus.html">Consensus model</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="messaging.html">Networking and messaging</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="running-the-demos.html">Running the demos</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="node-administration.html">Node administration</a></li>
|
|
</ul>
|
|
<p class="caption"><span class="caption-text">Contracts</span></p>
|
|
<ul>
|
|
<li class="toctree-l1"><a class="reference internal" href="contract-catalogue.html">Platform contracts</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="contract-irs.html">Interest Rate Swaps</a></li>
|
|
</ul>
|
|
<p class="caption"><span class="caption-text">Tutorials</span></p>
|
|
<ul class="current">
|
|
<li class="toctree-l1 current"><a class="current reference internal" href="#">Where to start</a><ul>
|
|
<li class="toctree-l2"><a class="reference internal" href="#the-trader-demo">The trader demo</a></li>
|
|
</ul>
|
|
</li>
|
|
<li class="toctree-l1"><a class="reference internal" href="tutorial-contract.html">Writing a contract</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="tutorial-contract-clauses.html">Writing a contract using clauses</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="tutorial-test-dsl.html">Writing a contract test</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="protocol-state-machines.html">Protocol state machines</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="oracles.html">Writing oracle services</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="event-scheduling.html">Event scheduling</a></li>
|
|
</ul>
|
|
<p class="caption"><span class="caption-text">Appendix</span></p>
|
|
<ul>
|
|
<li class="toctree-l1"><a class="reference internal" href="release-process.html">Release process</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="release-process.html#steps-to-cut-a-release">Steps to cut a release</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="release-notes.html">Release notes</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="visualiser.html">Using the visualiser</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="codestyle.html">Code style guide</a></li>
|
|
<li class="toctree-l1"><a class="reference internal" href="building-the-docs.html">Building the documentation</a></li>
|
|
</ul>
|
|
|
|
|
|
|
|
</div>
|
|
</div>
|
|
</nav>
|
|
|
|
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
|
|
|
|
|
|
<nav class="wy-nav-top" role="navigation" aria-label="top navigation">
|
|
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
|
|
<a href="index.html">R3 Corda</a>
|
|
</nav>
|
|
|
|
|
|
|
|
<div class="wy-nav-content">
|
|
<div class="rst-content">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div role="navigation" aria-label="breadcrumbs navigation">
|
|
<ul class="wy-breadcrumbs">
|
|
<li><a href="index.html">Docs</a> »</li>
|
|
|
|
<li>Where to start</li>
|
|
<li class="wy-breadcrumbs-aside">
|
|
|
|
|
|
<a href="_sources/where-to-start.txt" rel="nofollow"> View page source</a>
|
|
|
|
|
|
</li>
|
|
</ul>
|
|
<hr/>
|
|
</div>
|
|
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
|
|
<div itemprop="articleBody">
|
|
|
|
<script type="text/javascript" src="_static/jquery.js"></script>
|
|
<script type="text/javascript" src="_static/codesets.js"></script><div class="section" id="where-to-start">
|
|
<h1>Where to start<a class="headerlink" href="#where-to-start" title="Permalink to this headline">¶</a></h1>
|
|
<p>So you want to start experimenting with Corda. Where do you begin? Although Corda is still very early and missing
|
|
large chunks of important functionality, this article will hopefully put you on the right place.</p>
|
|
<p>An experiment with Corda is started by picking a <em>scenario</em> and then turning it into a <em>demo</em>. It is important to
|
|
understand that at this stage in its life, Corda does not have a single unified server that loads everything
|
|
dynamically. Instead, Corda provides an object oriented API which is then used by a <em>driver</em> program, with one driver
|
|
per scenario. You can see the existing demo apps in action by <a class="reference internal" href="running-the-demos.html"><span class="doc">Running the demos</span></a>.</p>
|
|
<p>In future this design will change and there will be a single server that does everything. But for now, there isn’t.</p>
|
|
<p>A scenario contains:</p>
|
|
<ul class="simple">
|
|
<li>A set of participating nodes and their roles.</li>
|
|
<li>Some business process you wish to automate (typically simplified from the real thing).</li>
|
|
<li>The smart contracts and protocols that will automate that process.</li>
|
|
</ul>
|
|
<p>It may also specify a REST/JSON API, but this is optional.</p>
|
|
<p>Here’s are two example scenarios included in the box:</p>
|
|
<ol class="arabic simple">
|
|
<li>Bank A wishes to buy some commercial paper in return for cash. Bank B wants to issue and sell some CP to Bank A.
|
|
This is probably the simplest scenario in Corda that still does something interesting. It’s like the buttered
|
|
bread of finance.</li>
|
|
<li>Bank A and Bank B want to enter into an interest rate swap and evolve it through its lifecycle.</li>
|
|
</ol>
|
|
<p>The process of implementing a scenario looks like this:</p>
|
|
<ol class="arabic simple">
|
|
<li>First of all, design your states and transaction types. Read about the <a class="reference internal" href="data-model.html"><span class="doc">Data model</span></a> if you aren’t sure what that
|
|
involves.</li>
|
|
<li>Now, create a new file in the contracts/src/main directory. You can either any JVM language but we only provide examples
|
|
in Java and Kotlin. The file should define your state classes and your contract class, which will define the
|
|
allowable state transitions. You can learn how these are constructed by reading the “<a class="reference internal" href="tutorial-contract.html"><span class="doc">Writing a contract</span></a>” tutorial.</li>
|
|
<li>It isn’t enough to just define static data and logic that controls what’s allowed. You must also orchestrate the
|
|
business process. This is the job of the protocol framework. You can learn how to author these by reading
|
|
“<a class="reference internal" href="protocol-state-machines.html"><span class="doc">Protocol state machines</span></a>”.</li>
|
|
<li>Once you have created your states, transactions and protocols, you need a way to demonstrate them (outside of the
|
|
unit tests, of course). This topic is covered below.</li>
|
|
</ol>
|
|
<div class="section" id="the-trader-demo">
|
|
<h2>The trader demo<a class="headerlink" href="#the-trader-demo" title="Permalink to this headline">¶</a></h2>
|
|
<p>Until Corda has a unified server that can dynamically load every aspect of an application (i.e. software implementing a scenario),
|
|
we have to do a bit of copy/paste wiring ourselves.</p>
|
|
<p>The trader demo is a good place to start understanding this, which can be found in src/main/kotlin/demos/TraderDemo.kt</p>
|
|
<p>The idea of a driver program is that it starts a node in one of several roles, according to a command line flag. The
|
|
driver may step through some pre-programmed scenario automatically or it may register an API to be exported via HTTP.
|
|
You would then have to drive the node externally for your demo.</p>
|
|
<p>The best way to create your own scenario is not to write a driver from scratch but to copy the existing trader or IRS
|
|
demo drivers and then customise them, as much of the code would end up being shared (like for command line parsing).</p>
|
|
<p>Things you will want to adjust:</p>
|
|
<ol class="arabic simple">
|
|
<li>The name of the grouping directory each node role will create its private directory under.</li>
|
|
<li>The demo protocols that just wrap the real business process in some kind of fake trading logic.</li>
|
|
</ol>
|
|
<p>The IRS driver program registers REST APIs, but as this is seriously in flux right now and the APIs will change a lot,
|
|
we do not recommend you try this as part of your initial explorations unless you are feeling adventurous.</p>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
</div>
|
|
</div>
|
|
<footer>
|
|
|
|
<div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
|
|
|
|
<a href="tutorial-contract.html" class="btn btn-neutral float-right" title="Writing a contract" accesskey="n">Next <span class="fa fa-arrow-circle-right"></span></a>
|
|
|
|
|
|
<a href="contract-irs.html" class="btn btn-neutral" title="Interest Rate Swaps" accesskey="p"><span class="fa fa-arrow-circle-left"></span> Previous</a>
|
|
|
|
</div>
|
|
|
|
|
|
<hr/>
|
|
|
|
<div role="contentinfo">
|
|
<p>
|
|
© Copyright 2016, Distributed Ledger Group, LLC.
|
|
|
|
</p>
|
|
</div>
|
|
Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>.
|
|
|
|
</footer>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
</section>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript">
|
|
var DOCUMENTATION_OPTIONS = {
|
|
URL_ROOT:'./',
|
|
VERSION:'latest',
|
|
COLLAPSE_INDEX:false,
|
|
FILE_SUFFIX:'.html',
|
|
HAS_SOURCE: true
|
|
};
|
|
</script>
|
|
<script type="text/javascript" src="_static/jquery.js"></script>
|
|
<script type="text/javascript" src="_static/underscore.js"></script>
|
|
<script type="text/javascript" src="_static/doctools.js"></script>
|
|
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript" src="_static/js/theme.js"></script>
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript">
|
|
jQuery(function () {
|
|
SphinxRtdTheme.StickyNav.enable();
|
|
});
|
|
</script>
|
|
|
|
|
|
</body>
|
|
</html> |