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<li class="toctree-l1"><a class="reference internal" href="inthebox.html">What’s included?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="getting-set-up.html">Getting set up</a></li>
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<li class="toctree-l1"><a class="reference internal" href="data-model.html">Data model</a></li>
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<li class="toctree-l1"><a class="reference internal" href="transaction-data-types.html">Data types</a></li>
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<li class="toctree-l1"><a class="reference internal" href="consensus.html">Consensus model</a></li>
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<li class="toctree-l1"><a class="reference internal" href="node-administration.html">Node administration</a></li>
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<li class="toctree-l1"><a class="reference internal" href="irs.html">The Interest Rate Swap Contract</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Where to start</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#the-trader-demo">The trader demo</a></li>
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<li class="toctree-l1"><a class="reference internal" href="tutorial-contract.html">Writing a contract</a></li>
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<li class="toctree-l1"><a class="reference internal" href="tutorial-contract-clauses.html">Writing a contract using clauses</a></li>
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<h1>Where to start<a class="headerlink" href="#where-to-start" title="Permalink to this headline">¶</a></h1>
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<p>So you want to start experimenting with Corda. Where do you begin? Although Corda is still very early and missing
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large chunks of important functionality, this article will hopefully put you on the right place.</p>
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<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
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understand that at this stage in its life, Corda does not have a single unified server that loads everything
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dynamically. Instead, Corda provides an object oriented API which is then used by a <em>driver</em> program, with one driver
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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>
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<p>In future this design will change and there will be a single server that does everything. But for now, there isn’t.</p>
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<p>A scenario contains:</p>
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<ul class="simple">
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<li>A set of participating nodes and their roles.</li>
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<li>Some business process you wish to automate (typically simplified from the real thing).</li>
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<li>The smart contracts and protocols that will automate that process.</li>
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</ul>
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<p>It may also specify a REST/JSON API, but this is optional.</p>
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<p>Here’s are two example scenarios included in the box:</p>
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<ol class="arabic simple">
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<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.
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This is probably the simplest scenario in Corda that still does something interesting. It’s like the buttered
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bread of finance.</li>
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<li>Bank A and Bank B want to enter into an interest rate swap and evolve it through its lifecycle.</li>
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</ol>
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<p>The process of implementing a scenario looks like this:</p>
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<ol class="arabic simple">
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<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
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involves.</li>
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<li>Now, create a new file in the contracts/src/main directory. You can either any JVM language but we only provide examples
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in Java and Kotlin. The file should define your state classes and your contract class, which will define the
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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>
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<li>It isn’t enough to just define static data and logic that controls what’s allowed. You must also orchestrate the
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business process. This is the job of the protocol framework. You can learn how to author these by reading
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“<a class="reference internal" href="protocol-state-machines.html"><span class="doc">Protocol state machines</span></a>”.</li>
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<li>Once you have created your states, transactions and protocols, you need a way to demonstrate them (outside of the
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unit tests, of course). This topic is covered below.</li>
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</ol>
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<div class="section" id="the-trader-demo">
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<h2>The trader demo<a class="headerlink" href="#the-trader-demo" title="Permalink to this headline">¶</a></h2>
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<p>Until Corda has a unified server that can dynamically load every aspect of an application (i.e. software implementing a scenario),
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we have to do a bit of copy/paste wiring ourselves.</p>
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<p>The trader demo is a good place to start understanding this, which can be found in src/main/kotlin/demos/TraderDemo.kt</p>
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<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
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driver may step through some pre-programmed scenario automatically or it may register an API to be exported via HTTP.
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You would then have to drive the node externally for your demo.</p>
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<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
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demo drivers and then customise them, as much of the code would end up being shared (like for command line parsing).</p>
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<p>Things you will want to adjust:</p>
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<ol class="arabic simple">
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<li>The name of the grouping directory each node role will create its private directory under.</li>
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<li>The demo protocols that just wrap the real business process in some kind of fake trading logic.</li>
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</ol>
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<p>The IRS driver program registers REST APIs, but as this is seriously in flux right now and the APIs will change a lot,
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we do not recommend you try this as part of your initial explorations unless you are feeling adventurous.</p>
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