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<h1 class="page-title">Documentation: Model</h1>
<p class="lead page-description">This page discusses Strolch's model</p>
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<div class="content">
<p>Before we dive into the entire model, let's show an example and how it would be modelled in Strolch and use
in Strolch:</p>
<img class="image" src="images/strolch-model-example.png" alt="Strolch model example">
<p>A possible model would look as follows:</p>
<pre>
&lt;?xml version="1.0" encoding="UTF-8" ?&gt;
&lt;StrolchModel xmlns="https://strolch.li/xsd/StrolchModel-1.6.xsd"&gt;
&lt;Resource Id="Product" Name="Product Template" Type="Template"&gt;
&lt;ParameterBag Id="parameters" Name="Parameters" Type="Parameters"&gt;
&lt;Parameter Id="description" Name="Description" Type="String" Value=""/&gt;
&lt;Parameter Id="color" Name="Color" Type="String" Value=""/&gt;
&lt;Parameter Id="form" Name="Form" Type="String" Value=""/&gt;
&lt;/ParameterBag&gt;
&lt;ParameterBag Id="relations" Name="Relations" Type="Relations"&gt;
&lt;Parameter Id="articles" Name="Articles" Type="StringList" Interpretation="Resource-Ref" Uom="Article" Value=""/&gt;
&lt;/ParameterBag&gt;
&lt;/Resource&gt;
&lt;Resource Id="Article" Name="Article Template" Type="Template"&gt;
&lt;ParameterBag Id="parameters" Name="Parameters" Type="Parameters"&gt;
&lt;Parameter Id="description" Name="Description" Type="String" Value=""/&gt;
&lt;Parameter Id="barcode" Name="Barcode" Type="String" Value=""/&gt;
&lt;/ParameterBag&gt;
&lt;ParameterBag Id="relations" Name="Relations" Type="Relations"&gt;
&lt;Parameter Id="product" Name="Product" Type="String" Interpretation="Resource-Ref" Uom="Product" Value=""/&gt;
&lt;/ParameterBag&gt;
&lt;/Resource&gt;
&lt;Resource Id="Customer" Name="Customer Template" Type="Template"&gt;
&lt;ParameterBag Id="address" Name="Address" Type="Address"&gt;
&lt;Parameter Id="street" Name="Street" Type="String" Value=""/&gt;
&lt;Parameter Id="zip" Name="Zip" Type="String" Value=""/&gt;
&lt;Parameter Id="city" Name="City" Type="String" Value=""/&gt;
&lt;Parameter Id="country" Name="Country" Type="String" Value=""/&gt;
&lt;/ParameterBag&gt;
&lt;/Resource&gt;
&lt;Order Id="Order" Name="Order" Type="Template"&gt;
&lt;ParameterBag Id="quantities" Name="Quantities per Article Id" Type="Quantities"&gt;
&lt;Parameter Id="quantity" Name="Quantity" Type="Float" Value="0"/&gt;
&lt;/ParameterBag&gt;
&lt;ParameterBag Id="relations" Name="Relations" Type="Relations"&gt;
&lt;Parameter Id="articles" Name="Articles" Type="StringList" Interpretation="Resource-Ref" Uom="Article" Value=""/&gt;
&lt;Parameter Id="customer" Name="Customer" Type="String" Interpretation="Resource-Ref" Uom="Customer" Value=""/&gt;
&lt;/ParameterBag&gt;
&lt;/Order&gt;
&lt;/StrolchModel&gt;</pre>
<p>Let's go through this model:</p>
<ul>
<li><p>In the above model we see that the <code>id</code> and <code>name</code> fields are always on the
element, and thus aren't added as parameters. Further most elements have a <code>parameters</code>
ParameterBag, with one or more parameters, modelling the fields.</p></li>
<li><p>Note that in this example the <code>Type</code> of all the elements is <code>Template</code>. Strolch
has API support to create a clone of these elements, so that they have a unique ID, and the proper
type for persistence.</p>
</li>
<li><p>The <code>Product</code> element has three parameters: <code>description</code>, <code>color</code>
and <code>form</code>. In this case they are all of type String. Further the <code>relations</code>
ParameterBag defines the relationships, i.e. the product knows its articles. Note how the relation is
first defined in a <code>relations</code> ParameterBag and that the Parameter has <code>Interpretation="Resource-Ref"
Uom="Product"</code>
attributes. Strolch has API support for this, making it trivial to retrieve a dependency.</p></li>
<li><p>The <code>Article</code> element has two parameters <code>description</code> and <code>barcode</code>.
Further it has a reference to its Product.</p></li>
<li>The <code>Order</code> element doesn't model the <code>date</code> and <code>state</code> fields as
parameters, as these are inherently part of an Order element. The Order does define two references to
<code>customer</code> and <code>articles</code>. A special case is the <code>quantities</code>
ParameterBag. This bag of parameters is used to store the per article quantity for this order. With
ParameterBags, you can eliminate the use of simple aggregate classes, as is commonly used in
object-oriented programming.
</li>
<li>The <code>Customer</code> element models a <code>address</code> ParameterBag to store the address of a
customer. Using a separate bag allows for further more direct fields to stored on the default <code>parameters</code>
bag.
</li>
</ul>
<p>Now that we have a basic understanding of te model, it is of far more interest in how to create and interact
with these elements at runtime. The following listing will perform simple operations:</p>
<pre>
try (StrolchTransaction tx = runtimeMock.openUserTx(certificate, false)) {
/*
* create a new product
*/
Resource dafalgan = tx.getResourceTemplate("Product", true);
dafalgan.setName("Dafalgan 100mg");
dafalgan.getParameter("description", true).setValue("Dafalgan is for pain.");
dafalgan.getParameter("color", true).setValue("Yellow");
dafalgan.getParameter("form", true).setValue("flat");
StringListParameter articlesP = dafalgan.getRelationsParam("articles", true);
/*
* create articles
*/
Resource dafalgan1 = tx.getResourceTemplate("Article", true);
dafalgan1.setName("Dafalgan 100mg 10 pce");
dafalgan1.getParameter("description", true).setValue("This is pack with 10 pieces.");
dafalgan1.getParameter("barcode", true).setValue("654654");
Resource dafalgan2 = tx.getResourceTemplate("Article", true);
dafalgan2.setName("Dafalgan 100mg 20 pce");
dafalgan2.getParameter("description", true).setValue("This is pack with 20 pieces.");
dafalgan2.getParameter("barcode", true).setValue("654655");
/*
* add reference to product
*/
dafalgan1.getRelationParam("product").setValue(dafalgan.getId());
articlesP.addValue(dafalgan1.getId());
dafalgan2.getRelationParam("product").setValue(dafalgan.getId());
articlesP.addValue(dafalgan2.getId());
/*
* create a new customer
*/
Resource customer1 = tx.getResourceTemplate("Customer", true);
customer1.setName("John Doe");
// set address
ParameterBag addressBag = customer1.getParameterBag("address", true);
addressBag.getParameter("street", true).setValue("Main Str. 1");
addressBag.getParameter("zip", true).setValue("1234");
addressBag.getParameter("city", true).setValue("Hometown");
addressBag.getParameter("country", true).setValue("Switzerland");
/*
* create a new order
*/
Order order = tx.getOrderTemplate("Order", true);
order.setName("Order for " + customer1.getName());
order.setDate(LocalDate.of(2021, 2, 1));
order.setState(State.PLANNED);
// store reference to customer
order.getRelationParam("customer", true).setValue(customer1.getId());
StringListParameter orderArticlesP = order.getRelationsParam("articles", true);
ParameterBag quantitiesBag = order.getParameterBag("quantities", true);
FloatParameter quantityT = quantitiesBag.removeParameter("quantity");
// order quantity of 20 for Dafalgan 1
FloatParameter q1P = quantityT.getClone();
q1P.setId(dafalgan1.getId());
q1P.setValue(20);
quantitiesBag.addParameter(q1P);
orderArticlesP.addValue(dafalgan1.getId());
// set order quantity of 10 for Dafalgan 2
FloatParameter q2P = quantityT.getClone();
orderArticlesP.addValue(dafalgan2.getId());
q2P.setId(dafalgan2.getId());
q2P.setValue(20);
quantitiesBag.addParameter(q2P);
// keep IDs for later use
dafalganId = dafalgan.getId();
dafalgan1Id = dafalgan1.getId();
dafalgan2Id = dafalgan2.getId();
customerId = customer1.getId();
orderId = order.getId();
/*
* persist
*/
tx.add(dafalgan);
tx.add(dafalgan1);
tx.add(dafalgan2);
tx.add(customer1);
tx.add(order);
// commit
tx.commitOnClose();
}
try (StrolchTransaction tx = runtimeMock.openUserTx(certificate, true)) {
// get order
Order order = tx.getOrderBy("Order", orderId, true);
assertNotNull(orderId);
assertEquals("Order for John Doe", order.getName());
// get customer
Resource customer = tx.getResourceByRelation(order, "customer", true);
assertNotNull(customer);
assertEquals("John Doe", customer.getName());
// get articles
List&lt;Resource&gt; articles = tx.getResourcesByRelation(order, "articles", true);
assertEquals(2, articles.size());
// get products
List&lt;Resource&gt; products = articles.stream().map(a -&gt; tx.getResourceByRelation(a, "product", true))
.distinct().collect(Collectors.toList());
assertEquals(1, products.size());
// search for all orders in state PLANNED and with customer
List&lt;Order&gt; orders = new OrderSearch().types("Order").stateIsIn(State.PLANNED)
.where(ExpressionsSupport.relationParam("customer").isEqualTo(customerId)).search(tx).toList();
assertEquals(1, orders.size());
}</pre>
<p><b>Note:</b> Checkout
<a href="https://github.com/4treesCH/strolch/blob/develop/li.strolch.service/src/test/resources/transienttest/data/example-model.xml">example-model.xml</a>
and
<a href="https://github.com/4treesCH/strolch/blob/develop/li.strolch.service/src/test/java/li/strolch/service/SimpleModelTest.java">SimpleModelTest.java</a>
for these examples. </p>
<p>There is a XML Schema which defines the model in XML:
<a href="xsd/StrolchModel-1.6.xsd">StrolchModel-1.6.xsd</a>
</p>
Here is an example of all the possible elements in Strolch:
<pre>
&lt;StrolchModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="https://strolch.li/xsd/StrolchModel-1.6.xsd"
xsi:schemaLocation="https://strolch.li/xsd/StrolchModel-1.6.xsd StrolchModel-1.6.xsd"&gt;
&lt;IncludeFile file="Include1.xml"/&gt;
&lt;Order Id="@test1" Name="Test Order" Type="Order"&gt;
&lt;Version Version="0" CreatedBy="test" CreatedAt="2012-11-30T18:12:05.628+01:00" Deleted="false"/&gt;
&lt;ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;Policies&gt;
&lt;Policy Type="PlanningPolicy" Value="key:SimplePlanning"/&gt;
&lt;Policy Type="ConfirmationPolicy" Value="key:NoConfirmation"/&gt;
&lt;/Policies&gt;
&lt;/Order&gt;
&lt;Resource Id="MyTestResource" Name="Test Name" Type="TestType"&gt;
&lt;Version Version="0" CreatedBy="test" CreatedAt="2012-11-30T18:12:05.628+01:00" Deleted="false"/&gt;
&lt;ParameterBag Id="@bag01" Name="Test Bag 01" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;ParameterBag Id="@bag02" Name="Test Bag 02" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;TimedState Id="@booleanState" Name="Boolean State" Type="Boolean"&gt;
&lt;Value Time="1970-01-01T00:02:00.000+01:00" Value="false"/&gt;
&lt;/TimedState&gt;
&lt;Policies&gt;
&lt;Policy Type="PlanningPolicy" Value="key:SimplePlanning"/&gt;
&lt;Policy Type="ConfirmationPolicy" Value="key:NoConfirmation"/&gt;
&lt;/Policies&gt;
&lt;/Resource&gt;
&lt;Activity Id="activity_1" Name="Activity" Type="parentType" TimeOrdering="Series"&gt;
&lt;Version Version="0" CreatedBy="test" CreatedAt="2012-11-30T18:12:05.628+01:00" Deleted="false"/&gt;
&lt;ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;Policies&gt;
&lt;Policy Type="PlanningPolicy" Value="key:SimplePlanning"/&gt;
&lt;Policy Type="ConfirmationPolicy" Value="key:NoConfirmation"/&gt;
&lt;/Policies&gt;
&lt;Action Id="action_1" Name="Action 1" ResourceId="dummyId" ResourceType="dummyType" State="Created" Type="Use"&gt;
&lt;ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;Policies&gt;
&lt;Policy Type="PlanningPolicy" Value="key:SimplePlanning"/&gt;
&lt;Policy Type="ConfirmationPolicy" Value="key:NoConfirmation"/&gt;
&lt;/Policies&gt;
&lt;ValueChange StateId="dummyId" Time="2012-11-30T18:12:05.628+01:00" Value="5" Type="Integer"/&gt;
&lt;ValueChange StateId="dummyId" Time="2012-11-30T18:12:06.628+01:00" Value="6" Type="Integer"/&gt;
&lt;/Action&gt;
&lt;Activity Id="child_activity" Name="Child Activity" Type="childType" TimeOrdering="Series"&gt;
&lt;ParameterBag Id="@bag01" Name="Test Bag" Type="TestBag"&gt;
&lt;Parameter Id="@param1" Name="Boolean Param" Type="Boolean" Value="true"/&gt;
&lt;/ParameterBag&gt;
&lt;Policies&gt;
&lt;Policy Type="PlanningPolicy" Value="key:SimplePlanning"/&gt;
&lt;Policy Type="ConfirmationPolicy" Value="key:NoConfirmation"/&gt;
&lt;/Policies&gt;
&lt;Action Id="action_2" Name="Action 2" ResourceId="dummyId" ResourceType="dummyType" State="Planned"
Type="Use"&gt;
&lt;ValueChange StateId="dummyId" Time="2012-11-30T18:12:05.628+01:00" Value="5" Type="Integer"/&gt;
&lt;ValueChange StateId="dummyId" Time="2012-11-30T18:12:06.628+01:00" Value="6" Type="Integer"/&gt;
&lt;/Action&gt;
&lt;Action Id="action_3" Name="Action 3" ResourceId="dummyId" ResourceType="dummyType" State="Created"
Type="Use"/&gt;
&lt;/Activity&gt;
&lt;/Activity&gt;
&lt;/StrolchModel&gt;</pre>
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