| <?xml version="1.0"?> |
| <!-- |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| --> |
| <!-- |
| This document uses Groovy as the expressions language. |
| --> |
| <scxml xmlns="http://www.w3.org/2005/07/scxml" |
| xmlns:cs="https://commons.apache.org/scxml" |
| version="1.0" |
| datamodel="groovy" |
| initial="microwave"> |
| |
| <!-- Trivial microwave oven example using a Groovy closure defined within a script. |
| The closure is bind to the initial script context and thereby available in all sub contexts as well. |
| |
| This example is *only* to test and demonstrate it 'works'. |
| However, using Groovy closures for SCXML is strongly discouraged because of the limitations |
| (like NOT serializable) and serious memory/performance overhead they may cause. |
| |
| Better use the initial script as script base and def(ine) methods which provides same/similar capabilities |
| without the costs of closures. As an example, see: serializable-initial-base-script.xml |
| --> |
| <script> |
| // simple boolean closure |
| cookingDone = { ctx -> ctx.timer ge ctx.cook_time } |
| </script> |
| |
| <state id="microwave"> |
| |
| <initial> |
| <transition target="parts"/> |
| </initial> |
| |
| <parallel id="parts"> |
| |
| <state id="oven"> |
| <initial> |
| <transition target="off"/> |
| </initial> |
| |
| <state id="off"> |
| <!-- off state --> |
| <transition event="turn_on" target="on"/> |
| </state> |
| |
| <state id="on"> |
| <initial> |
| <transition target="idle"/> |
| </initial> |
| |
| <!-- on/pause state --> |
| <onentry> |
| <!-- we assume the cook_time is passed in as a context parameter --> |
| <if cond="!var('cook_time')"> |
| <!-- default setting, note namespace of this custom action --> |
| <cs:var name="cook_time" expr="5"/> |
| </if> |
| <!-- timer variable --> |
| <cs:var name="timer" expr="0"/> |
| </onentry> |
| |
| <transition event="turn_off" target="off"/> |
| |
| <transition cond="cookingDone(binding)" target="off"/> |
| |
| <state id="idle"> |
| <transition cond="In('closed')" target="cooking"/> |
| </state> |
| |
| <state id="cooking"> |
| <transition cond="!In('closed')" target="idle"/> |
| |
| <transition event="time" target="cooking"> |
| <assign location="timer" expr="timer + 1"/> |
| </transition> |
| </state> |
| </state> |
| </state> |
| |
| <state id="door"> |
| <initial> |
| <transition target="closed"/> |
| </initial> |
| <state id="closed"> |
| <transition event="door_open" target="open"/> |
| </state> |
| <state id="open"> |
| <transition event="door_close" target="closed"/> |
| </state> |
| </state> |
| |
| </parallel> |
| |
| </state> |
| |
| </scxml> |