Author: rahul
Date: Wed Mar 1 07:53:58 2006
New Revision: 382066
URL: http://svn.apache.org/viewcvs?rev=382066&view=rev
Log:
BZ 38274 [scxml] Write Use Case for Stand-alone Application Modelling a Stop
Watch
Added:
jakarta/commons/sandbox/scxml/trunk/xdocs/usecases/scxml-stopwatch.xml
(with props)
Modified:
jakarta/commons/sandbox/scxml/trunk/xdocs/navigation.xml
jakarta/commons/sandbox/scxml/trunk/xdocs/usecases.xml
Modified: jakarta/commons/sandbox/scxml/trunk/xdocs/navigation.xml
URL:
http://svn.apache.org/viewcvs/jakarta/commons/sandbox/scxml/trunk/xdocs/navigation.xml?rev=382066&r1=382065&r2=382066&view=diff
==============================================================================
--- jakarta/commons/sandbox/scxml/trunk/xdocs/navigation.xml (original)
+++ jakarta/commons/sandbox/scxml/trunk/xdocs/navigation.xml Wed Mar 1
07:53:58 2006
@@ -51,6 +51,9 @@
href="/usecases.html"
collapse="true">
+ <item name="SCXML Stopwatch"
+ href="/usecases/scxml-stopwatch.html" />
+
<item name="SCXML in RDC group container"
href="/usecases/scxml-in-rdc-group.html" />
Modified: jakarta/commons/sandbox/scxml/trunk/xdocs/usecases.xml
URL:
http://svn.apache.org/viewcvs/jakarta/commons/sandbox/scxml/trunk/xdocs/usecases.xml?rev=382066&r1=382065&r2=382066&view=diff
==============================================================================
--- jakarta/commons/sandbox/scxml/trunk/xdocs/usecases.xml (original)
+++ jakarta/commons/sandbox/scxml/trunk/xdocs/usecases.xml Wed Mar 1 07:53:58
2006
@@ -37,23 +37,36 @@
that can be represented as a UML state chart, for example, business process
flows, view navigation bits, interaction or dialog management etc. (this is,
by no means, a comprehensive list), can leverage the Commons SCXML engine
- library. We illustrate just a few sample usecases within frameworks in the
- open source community as illustrations.
+ library. We illustrate just a few sample usecases as illustrations.
</p>
</subsection>
<subsection name="Samples">
- <p>
- <ul>
- <li><a href="usecases/scxml-in-rdc-group.html">Usecase 1</a> - Use in
- <a href="http://jakarta.apache.org/taglibs/doc/rdc-doc/intro.html";>
- Reusable Dialog Components (RDC) Framework</a> <group>
- container.</li>
- <li><a href="usecases/scxml-in-shale-dialogs.html">Usecase 2</a> -
- Use in <a href="http://struts.apache.org/shale";>Shale</a> dialogs</li>
- </ul>
- </p>
- <br/>
+ <p>Simple usecases, and beyond:</p>
+ <subsection name="Simple">
+ <p>These are "standalone" usecases, which do not require any knowledge
+ beyond beginner Java and beginner XML.
+ <ul>
+ <li><a href="usecases/scxml-stopwatch.html">Usecase 1</a> -
+ Using Commons SCXML to model and implement behavior of stateful
+ objects (SCXML stopwatch example).</li>
+ </ul>
+ </p>
+ </subsection>
+ <subsection name="Advanced">
+ <p>These are usecases within frameworks available in the open source
+ community, and are labeled advanced since they require some additional
+ knowledge about the framework relevant to the particular usecase.
+ <ul>
+ <li><a href="usecases/scxml-in-rdc-group.html">Usecase 2</a> - Use in
+ <a href="http://jakarta.apache.org/taglibs/doc/rdc-doc/intro.html";>
+ Reusable Dialog Components (RDC) Framework</a> <group>
+ container.</li>
+ <li><a href="usecases/scxml-in-shale-dialogs.html">Usecase 3</a> -
+ Use in <a href="http://struts.apache.org/shale";>Shale</a> dialogs</li>
+ </ul>
+ </p>
+ </subsection>
<p>If you know of another usecase we should list or if you are interesting
in seeing if SCXML fits a usecase you have in mind, contact us via the
<a href="mail-lists.html">mailing lists</a>.
Added: jakarta/commons/sandbox/scxml/trunk/xdocs/usecases/scxml-stopwatch.xml
URL:
http://svn.apache.org/viewcvs/jakarta/commons/sandbox/scxml/trunk/xdocs/usecases/scxml-stopwatch.xml?rev=382066&view=auto
==============================================================================
--- jakarta/commons/sandbox/scxml/trunk/xdocs/usecases/scxml-stopwatch.xml
(added)
+++ jakarta/commons/sandbox/scxml/trunk/xdocs/usecases/scxml-stopwatch.xml Wed
Mar 1 07:53:58 2006
@@ -0,0 +1,115 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2006 The Apache Software Foundation
+
+ Licensed 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.
+-->
+
+<document>
+
+ <properties>
+ <title>Commons SCXML Usecases - Stopwatch</title>
+ <author email="commons-dev@jakarta.apache.org">Commons Documentation
Team</author>
+ </properties>
+
+ <body>
+
+ <section name="Using SCXML documents to define behavior">
+
+ <p>SCXML documents (more generically, UML state chart diagrams) can be used
+ to define stateful behavior of objects, and Commons SCXML enables
+ developers to take this model directly into the corresponding code
+ artifacts. The resulting artifacts tend to be much simpler, embody a
+ useful separation of concerns and are easier to understand and maintain.
+ </p>
+
+ <subsection name="Motivation">
+ <ul>
+ <li>Demonstrate a "standalone" usecase of Commons SCXML
+ (some of the other usecases are "frameworky" in nature and require
+ additional knowledge of the framework the particular usecase
+ refers to).</li>
+ <li>Demonstrate the useful separation of concerns, the
+ simplicity of the resulting artifacts, and the direct association
+ between the model and the code when using Commons SCXML to
+ incorporate behavior.</li>
+ </ul>
+ </subsection>
+
+ </section>
+
+ <section name="Sample walkthrough - From model to working code">
+
+ <p>Here is a short exercise in modeling and implementing an object with
+ stateful behavior. A stopwatch -- for anyone who may need an introduction
+ -- is used to measure duration, with one button for starting and stopping
+ the watch and another one for pausing the display (also known as "split",
+ where the watch continues to keep time while the display is frozen, to
+ measure, for example, "lap times" in races). Once the watch has been
+ stopped, the start/stop button may be used to reset the display.
+ </p>
+
+ <subsection name="The Model - UML Diagram">
+ <p>Here is the state chart diagram that describes the behavior
+ of this particular stopwatch:<br/>
+ <a href="scxml-stopwatch/stopwatch.jpg"><img
+ src="scxml-stopwatch/stopwatch.jpg" border="0"
+ alt="stopwatch state chart diagram"/></a><br/>
+ (<a href="scxml-stopwatch/stopwatch-model.jpg">Zoom out</a>)
+ </p>
+ </subsection>
+
+ <subsection name="The SCXML document">
+ <p>The SCXML document is then, a simple serialization of
+ the "model" above:
+ <a
href="http://svn.apache.org/repos/asf/jakarta/commons/sandbox/scxml/trunk/src/test/java/org/apache/commons/scxml/env/stopwatch.xml";>stopwatch.xml</a>.
+ </p>
+ </subsection>
+
+ <subsection name="The Stopwatch class">
+ <p>Here is the class that implements the stopwatch behavior,
+ <a
href="../xref-test/org/apache/commons/scxml/env/StopWatch.html">StopWatch.java</a>.
+ The class extends
+ <a
href="../xref/org/apache/commons/scxml/env/AbstractStateMachine.html">AbstractStateMachine.java</a>,
+ which provides one approach for providing the base functionality
+ needed by classes representing stateful entities. Points to note
+ in the StopWatch class are:
+ <ul>
+ <li>The "lifecycle" is defined by the SCXML document, which is
+ an artifact easily derived from the modeling layer.</li>
+ <li>The code is much simpler, since the lifecycle management
+ task has been assigned to Commons SCXML.</li>
+ </ul>
+ </p>
+ </subsection>
+
+ <subsection name="The Stopwatch UI">
+ <p>Here is the UI for our demonstration,
+ <a
href="../xref-test/org/apache/commons/scxml/env/StopWatchDisplay.html">StopWatchDisplay.java</a>.
+ Points to note here are:
+ <ul>
+ <li>The UI is "backed" by a StopWatch instance.</li>
+ <li>It merely relays the user initiated events (in this case,
+ button clicks) to the Commons SCXML driven StopWatch
+ instance by serving as an intermediary / proxy.</li>
+ <li>The UI and application behavior separation is thus, and
+ usefully, pronounced.</li>
+ </ul>
+ </p>
+ </subsection>
+
+ </section>
+
+ </body>
+
+</document>
Propchange:
jakarta/commons/sandbox/scxml/trunk/xdocs/usecases/scxml-stopwatch.xml
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