Business Process

A BPMN-style process inspired by Business Process Model and Notation.

This is a BPMN-style order fulfillment process modeled in SCXML. It uses event, activity, gateway, and parallel-flow concepts from Business Process Model and Notation, then makes the flow executable in SCION.

SCXML source

<scxml datamodel="ecmascript"
       initial="receiveOrder"
       name="OrderFulfillmentProcess"
       version="1.0"
       xmlns="http://www.w3.org/2005/07/scxml">
  <datamodel>
    <data id="orderStatus" expr="'waiting for order'"/>
    <data id="paymentStatus" expr="'not started'"/>
    <data id="warehouseStatus" expr="'not started'"/>
  </datamodel>

  <state id="receiveOrder">
    <onentry>
      <assign location="orderStatus" expr="'waiting for order'"/>
      <send event="trace"><content expr="'Start event: waiting for a customer order.'"/></send>
    </onentry>
    <transition event="order.received" target="validateOrder">
      <assign location="orderStatus" expr="'received'"/>
    </transition>
  </state>

  <state id="validateOrder">
    <onentry>
      <assign location="orderStatus" expr="'validating order'"/>
      <send event="trace"><content expr="'Activity: validate order.'"/></send>
    </onentry>
    <transition event="order.valid" target="checkInventory"/>
    <transition event="order.invalid" target="cancelled">
      <assign location="orderStatus" expr="'invalid order'"/>
    </transition>
  </state>

  <state id="checkInventory">
    <onentry>
      <assign location="orderStatus" expr="'checking inventory'"/>
      <send event="trace"><content expr="'Exclusive gateway: inventory available?'"/></send>
    </onentry>
    <transition event="inventory.available" target="fulfillment"/>
    <transition event="inventory.unavailable" target="backorder"/>
  </state>

  <state id="backorder">
    <onentry>
      <assign location="orderStatus" expr="'backordered'"/>
      <send event="trace"><content expr="'Waiting for inventory or customer cancellation.'"/></send>
    </onentry>
    <transition event="inventory.available" target="fulfillment"/>
    <transition event="customer.cancel" target="cancelled">
      <assign location="orderStatus" expr="'cancelled by customer'"/>
    </transition>
  </state>

  <parallel id="fulfillment">
    <onentry>
      <assign location="orderStatus" expr="'fulfilling order'"/>
      <assign location="paymentStatus" expr="'authorizing'"/>
      <assign location="warehouseStatus" expr="'picking and packing'"/>
      <send event="trace"><content expr="'Parallel gateway: authorize payment and pick/pack order.'"/></send>
    </onentry>

    <transition event="payment.declined" target="cancelled">
      <assign location="paymentStatus" expr="'declined'"/>
      <assign location="orderStatus" expr="'payment declined'"/>
    </transition>

    <state id="payment" initial="authorizePayment">
      <state id="authorizePayment">
        <transition event="payment.approved" target="paymentComplete">
          <assign location="paymentStatus" expr="'approved'"/>
          <send event="trace"><content expr="'Payment approved.'"/></send>
        </transition>
      </state>
      <final id="paymentComplete"/>
    </state>

    <state id="warehouse" initial="pickAndPack">
      <state id="pickAndPack">
        <transition event="package.ready" target="warehouseComplete">
          <assign location="warehouseStatus" expr="'package ready'"/>
          <send event="trace"><content expr="'Package ready.'"/></send>
        </transition>
      </state>
      <final id="warehouseComplete"/>
    </state>
  </parallel>

  <transition event="done.state.fulfillment" target="shipOrder"/>

  <state id="shipOrder">
    <onentry>
      <assign location="orderStatus" expr="'ready to ship'"/>
      <send event="trace"><content expr="'Activity: ship order.'"/></send>
    </onentry>
    <transition event="shipment.sent" target="completed">
      <assign location="orderStatus" expr="'shipped'"/>
    </transition>
  </state>

  <final id="completed">
    <onentry>
      <assign location="orderStatus" expr="'completed'"/>
      <send event="trace"><content expr="'End event: order completed.'"/></send>
    </onentry>
  </final>

  <final id="cancelled">
    <onentry>
      <send event="trace"><content expr="'End event: order cancelled.'"/></send>
    </onentry>
  </final>
</scxml>