511 lines
23 KiB
HTML
511 lines
23 KiB
HTML
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<meta name="description" content="">
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<title>Strolch: API</title>
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<!-- Bootstrap core CSS -->
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<body>
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<div class="navbar navbar-inverse navbar-fixed-top" role="navigation">
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<div class="container">
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<div class="navbar-header">
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<a class="navbar-brand" href="index.html">Strolch</a>
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</div>
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<div class="collapse navbar-collapse">
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<ul class="nav navbar-nav">
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<li><a href="index.html">Overview</a></li>
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<li class="active"><a href="api.html">API</a></li>
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<li><a href="documentation.html">Documentation</a></li>
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<li><a href="tutorial.html">Tutorial</a></li>
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<li><a href="downloads.html">Downloads</a></li>
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<li><a href="development.html">Development</a></li>
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<li><a href="blog.html">Blog</a></li>
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</ul>
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</div>
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<!--/.nav-collapse -->
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</div>
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</div>
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<div class="container">
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<div class="page-header">
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<h1 class="page-title">Strolch API</h1>
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<p class="lead page-description">This page describes the Strolch API.</p>
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</div>
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<div class="content">
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<h2>Overview</h2>
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<p>The Strolch API revolves around the <i>StrolchTransaction</i> object. The main concept is to implement your
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use cases in <i>Service</i> implementations. You open a transaction using the <i>openTx(String)</i>-method
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and then perform the use case by adding your <i>Command</i> instances to the transaction.</p>
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<p>Transactions are opened on a <i>StrolchRealm</i>. The realms are used to separate mandates in a single
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runtime instance of Strolch. Each realm has its own <i>ResourceMap</i>, <i>OrderMap</i>, <i>ActivityMap</i>
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instances from which the TX retrieves the elements.</p>
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<h2>Model</h2>
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<p>The Strolch model is implemented in the project li.strolch.model.</p>
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<p>The Strolch model consists of three root level elements: <i>Resource</i>, <i>Order</i> and <i>Activity</i>.
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Each element has at least the following attributes:</p>
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<ul>
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<li>Id → the element's id</li>
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<li>Name → the element's name</li>
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<li>Type → the element's type</li>
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</ul>
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<p>Each root element can have any number of <i>ParameterBag</i> instances on it, which in turn can have any
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number of <i>Parameters</i> on it. Accessing these objects is always done by their IDs. Strolch root elements
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are always stored in the respective <i>ElementMaps</i> in their Strolch realm. Thus accessing a certain
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parameter from a <i>Resource</i> would look like this:</p>
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<pre class="pre-scrollable">
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try (StrolchTransaction tx = openTx(realmName)) {
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Resource resource = tx.getResourceBy("TestType", "MyTestResource");
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DateParameter dateP = resource.getParameter("@bag01", "@param6");
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Date date = dateP.getValue();
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logger.info("@param6 date is " + date);
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}</pre>
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XML Presentation of Strolch's top level elements of <i>Resources</i>:
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<pre class="pre-scrollable">
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<!-- Resource instance -->
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<Resource Id="MyTestResource" Name="Test Name" Type="TestType">
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<ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag">
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<Parameter Id="@param7" Name="StringList Param" Type="StringList" Value="Hello;World" />
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<Parameter Id="@param6" Name="Date Param" Type="Date" Value="2012-11-30T18:12:05.628+01:00" />
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<Parameter Id="@param5" Name="String Param" Type="String" Value="Strolch" />
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</ParameterBag>
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<ParameterBag Id="@bag02" Name="Test Bag" Type="TestBag">
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<Parameter Id="@param4" Name="Long Param" Type="Long" Value="4453234566" />
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<Parameter Id="@param3" Name="Integer Param" Type="Integer" Value="77" />
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<Parameter Id="@param2" Name="Float Param" Type="Float" Value="44.3" />
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<Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true" />
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</ParameterBag>
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<TimedState Id="@integerState" Name="Integer State" Type="IntegerState">
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<Value Time="0" Value="1" />
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<Value Time="1" Value="2" />
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<Value Time="2" Value="3" />
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<TimedState>
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</Resource></pre>
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XML Presentation of Strolch's top level elements of <i>Orders</i>:
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<pre class="pre-scrollable">
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<!-- Order instance -->
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<Order Id="MyTestOrder" Name="Test Name" Type="TestType" Date="2013-11-20T07:42:57.699Z" State="CREATED">
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<ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag">
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<Parameter Id="@param7" Name="StringList Param" Type="StringList" Value="Hello;World" />
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<Parameter Id="@param6" Name="Date Param" Type="Date" Value="2012-11-30T18:12:05.628+01:00" />
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<Parameter Id="@param5" Name="String Param" Type="String" Value="Strolch" />
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</ParameterBag>
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<ParameterBag Id="@bag02" Name="Test Bag" Type="TestBag">
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<Parameter Id="@param4" Name="Long Param" Type="Long" Value="4453234566" />
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<Parameter Id="@param3" Name="Integer Param" Type="Integer" Value="77" />
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<Parameter Id="@param2" Name="Float Param" Type="Float" Value="44.3" />
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<Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true" />
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</ParameterBag>
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</Order></pre>
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XML Presentation of Strolch's top level elements of <i>Activities</i>:
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<pre class="pre-scrollable">
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<!-- Activity instance -->
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<Activity Id="bicycleProduction" Name="Bicycle Production" Type="Series">
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<Activity Id="componentProduction" Name="Production of components" Type="Series">
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<Action Id="consumeGears" Name="Gears"
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ResourceId="gears" ResourceType="Article" Type="Consume">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT0S" />
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</ParameterBag>
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</Action>
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<Activity Id="frameProduction" Name="Production frame" Type="Series">
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<Action Id="produce" Name="Production frame"
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ResourceId="frameProduction" ResourceType="Machine" Type="Use">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT5M" />
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</ParameterBag>
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</Action>
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<Action Id="toStock" Name="Frame ToStock"
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ResourceId="frame" ResourceType="Article" Type="Produce">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT1M" />
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</ParameterBag>
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</Action>
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</Activity>
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<Activity Id="brakeProduction" Type="Series" Name="Herstellen Bremsen" TimeOrdering="Series">
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<Action Id="produce" Name="Production saddle"
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ResourceId="saddleProduction" ResourceType="Machine" Type="Use">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT5M" />
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</ParameterBag>
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</Action>
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<Action Id="toStock" Name="Saddle ToStock"
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ResourceId="frame" ResourceType="Article" Type="Produce">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT1M" />
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</ParameterBag>
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</Action>
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</Activity>
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</Activity>
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<Action Id="assembly" Name="Bicycle assemble"
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ResourceId="bicycleAssembly" ResourceType="Assembly" Type="Use">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT5M" />
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</ParameterBag>
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</Action>
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<Action Id="toStock" Name="Bicycle to stock"
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ResourceId="bicycle" ResourceType="Product" Type="Produce">
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<ParameterBag Id="objectives" Name="Production goals" Type="Objectives">
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<Parameter Id="quantity" Name="Quantity" Type="Float" Value="1" />
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<Parameter Id="duration" Name="Duration" Type="Duration" Value="PT1M" />
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</ParameterBag>
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</Action>
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</Activity></pre>
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<h2>Realms</h2>
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Strolch realms implement the multi-client capability which is thus baked right into the Strolch runtime. When
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configuring a Strolch runtime, realms are configured and for each realm the data store mode is set. Each realm
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has its own persistence configuration and can thus run in one of the 4 modes that the Strolch agent implements:
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<ul>
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<li>EMPTY
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<p>This is a transient data store mode, where no model changes are persisted, but they are only kept in
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memory. When the Strolch agent is started, this realm stays empty as no data is loaded.</p></li>
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<li>TRANSIENT
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<p>This is the same as EMPTY, but with the difference that when the Strolch agent is started, an XML
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file is parsed and the in memory realm is populated with the elements parsed from that XML file.</p>
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</li>
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<li>CACHED
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<p>In this mode, all data is stored in memory, and any changes made are written back to the persistence
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layer. This allows for fast in-memory quries, but makes sure no data is lost when the agent is
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restarted.</p></li>
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</ul>
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<p>Strolch Realms are also responsible for opening Transactions, as these are bound to the persistence layer
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configured for this realm. At runtime, a realm is then accessed from the ComponentContainer:</p>
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<pre class="pre-scrollable">
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ComponentContainer container = getAgent().getContainer();
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StrolchRealm realm = container.getRealm(StrolchConstants.DEFAULT_REALM);
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try(StrolchTransaction tx = realm.openTx()) {
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Resource resource = tx.getResourceBy("TestType", "MyTestResource");
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...
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}</pre>
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In a Service implementation there is a convenience method, so that this is as simple as calling <i>openTx(String)</i>.
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<h2>Services and Commands</h2>
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<p>In the motivation section, it was discusses that writing business logic is what developing is about and a
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reason why Strolch is a different approach to the Java EE ecosystem. So this is where Services and Commands
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come into play, and tries to make writing business logic a first class citizen.</p>
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<p>Services are to be used once for each use case. Services are not re-used or called by other services.
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Services open transactions are implement the calling of the re-usable commands. Thus when writing projects
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using Strolch, the first thing to do after configuring the runtime environment for your situation, Services
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will be implemented.</p>
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<p>Commands on the other hand are re-usable and should be implemented in such a way, that they encapsulate the
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use case's different actions. Commands are then passed to a transaction for execution and, when the
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transaction is committed, will be executed. Commands also implement undoing its operation in the case of
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exceptions. Strolch transactions handle the life-cycle of a command. A further function of Commands is to
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lock the relevant Strolch elements before execution.</p>
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<p>A typical Service and Command implementation would look as follows:</p>
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<pre class="pre-scrollable">
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public class SetParameterService extends AbstractService<SetParameterArg, ServiceResult> {
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public static final long serialVersionUID = 1L;
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@Override
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protected ServiceResult internalDoService(SetParameterArg arg) {
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// open a new transaction
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try (StrolchTransaction tx = openTx(arg.realm)) {
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// find parameter to modify
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Parameter<?> parameter = tx.findElement(arg.locator);
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// instantiate the command
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SetParameterCommand command = new SetParameterCommand(getContainer(), tx);
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// set the arguments
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command.setParameter(parameter);
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command.setName(arg.name);
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command.setInterpretation(arg.interpretation);
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command.setUom(arg.uom);
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command.setHidden(arg.hidden);
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command.setIndex(arg.index);
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command.setValueAsString(arg.valueAsString);
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// add the command to the transaction
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tx.addCommand(command);
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// only now do we say we want to commit so that a rollback works nicely
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tx.commitOnClose();
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}
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// return the execution result of the service
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return ServiceResult.success();
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}
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/**
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* The argument class for this service
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*/
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public static class SetParameterArg extends ServiceArgument {
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public static final long serialVersionUID = 1L;
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public Locator locator;
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public String name;
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public String interpretation;
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public String uom;
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public Boolean hidden;
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public Integer index;
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public String valueAsString;
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}
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@Override
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protected ServiceResult getResultInstance() {
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return new ServiceResult();
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}
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}
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</pre>
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<pre class="pre-scrollable">
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public class SetParameterCommand extends Command {
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// input fields
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private Parameter<?> parameter;
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private String valueAsString;
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// undo fields
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private String oldValueAsString;
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private StrolchRootElement replacedElement;
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/**
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* @param container
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* @param tx
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*/
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public SetParameterCommand(ComponentContainer container, StrolchTransaction tx) {
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super(container, tx);
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}
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// setters for input ...
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// getters for output ...
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@Override
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public void validate() {
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DBC.PRE.assertNotNull("Parameter may not be null!", this.parameter);
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}
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@Override
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public void doCommand() {
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// lock the element to be modified
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StrolchRootElement rootElement = this.parameter.getRootElement();
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tx().lock(rootElement);
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// perform changes
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if (this.valueAsString != null) {
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this.oldValueAsString = this.parameter.getValueAsString();
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SetParameterValueVisitor visitor = new SetParameterValueVisitor();
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visitor.setValue(this.parameter, this.valueAsString);
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}
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// update root element
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if (hasChanges()) {
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replacedElement = new UpdateElementVisitor(tx()).update(rootElement);
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}
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}
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private boolean hasChanges() {
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return this.oldValueAsString != null || this.oldName != null || this.oldInterpretation != null
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|| this.oldUom != null || this.oldHidden != null || this.oldIndex != null;
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}
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@Override
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public void undo() {
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// undo changes
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if (this.oldValueAsString != null) {
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SetParameterValueVisitor visitor = new SetParameterValueVisitor();
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visitor.setValue(this.parameter, this.oldValueAsString);
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}
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// update root element
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if (hasChanges()
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&& this.replacedElement != null
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&& this.replacedElement != this.parameter.getRootElement()) {
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new UpdateElementVisitor(tx()).update(replacedElement);
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}
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}
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}
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}</pre>
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<h2>Code</h2>
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<p>The Strolch code can be retrieved from GitHub, where the code is hosted. Each commit triggers a continuous
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integration build, so that we are sure no tests are broken. The CI is viewable at
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<a href="https://ci.4trees.ch" target="_blank">4trees CI Server</a>.</p>
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<p>Strolch is divided up into different projects on GitHub so that these projects can be developed, or bugfixed
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independently and not all parts are required in every context.</p>
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<p><a href="https://github.com/4treesCH/strolch" target="_blank">Strolch on GitHub</a></p>
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<h3>Main Strolch components</h3>
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<ul>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.model">li.strolch.model</a>
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<p>This project implements the Strolch model. This is where you will find the different elements that
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can store data at runtime e.g. <i>Resources</i>, <i>Orders</i> and <i>Activities</i></p></li>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.agent">li.strolch.agent</a>
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<p>The agent is the Strolch runtime and is the component which implements the core Agent functionality.
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That is:</p>
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<ul>
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<li>Provide the Agent instance which loads the configuration and is the entry point to the runtime
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</li>
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<li>Provide the ComponentContainer instance from which the registered components can be accessed
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</li>
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<li>Configure and maintain the realms, which implement the multi-client capability</li>
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<li>Provide a default ServiceHandler to perform Services at runtime</li>
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<li>Implements the realms which each can operate in different modes data store modes: CACHED,
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TRANSIENT
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</li>
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</ul>
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</li>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.service">li.strolch.service</a>
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<p>Implements the basic Services and the re-usable Commands:</p>
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<ul>
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<li>CRUD Services and Commands to modify the model</li>
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<li>Commands to import and export the model to XML</li>
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<li>Further services and commands...</li>
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</ul>
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</li>
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</ul>
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<h3>Additional components</h3>
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<ul>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.persistence.postgresql">li.strolch.persistence.postgresql</a>
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<p>Implements a PostgreSQL persistence layer so that the Strolch model can be persisted to a PostgreSQL
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RDBMS when the realm is configured to have a data store mode of CACHED.</p>
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</li>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.persistence.xml">li.strolch.persistence.xml</a>
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<p>Implements an XML persistence layer so that the Strolch model can be persisted to XML files when the
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realm is configured to have a data store mode of CACHED.</p>
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</li>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.rest">li.strolch.rest</a>
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<p>Implements a Restful API to communicate with the Strolch runtime from clients and external
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systems.</p>
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</li>
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</ul>
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<h3>Meta projects</h3>
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<ul>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.bom">li.strolch.bom</a>
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<p>This bill of material is a Maven project which, when imported in one's own Strolch project, pulls in
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all required dependencies needed to set up a minimal working Strolch environment.</p>
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</li>
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<li><a href="https://github.com/4treesCH/strolch/tree/master/li.strolch.testbase">li.strolch.testbase</a>
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<p>Implements a test base so that writing tests for Strolch is easy. It provides a RuntimeMock, which
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|
handles setting up and tearing down Strolch runtimes during tests.</p>
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</li>
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</ul>
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<h3>Example projects</h3>
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<ul>
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<li><a href="https://github.com/4treesCH/strolch/tree/develop/strolch_minimal_rest" target="_blank">strolch_minimal_rest</a>
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<p>A minimal project to get started using REST with Strolch.</p>
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|
</li>
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|
<li><a href="https://github.com/4treesCH/strolch-bookshop" target="_blank">Strolch Bookshop</a>
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|
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<p>An example implentation of services etc. where we show how to use Strolch by implementing a simple
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|
book shop.</p>
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|
</li>
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|
</ul>
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<h2>Development</h2>
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<p>To start getting involved with Strolch Development, or create your own applications using Strolch, then see
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|
the <a href="development.html">development page</a></p>
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<a href="http://www.eitchnet.ch">eitchnet.ch</a></p>
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