craigmcc 01/08/13 14:16:46
Added: workflow/src/java/org/apache/commons/workflow/demo Main.java
main.xml
Log:
Initial check-in of the workflow management system proposal.
Revision Changes Path
1.1
jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/demo/Main.java
Index: Main.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/demo/Main.java,v
1.1 2001/08/13 21:16:46 craigmcc Exp $
* $Revision: 1.1 $
* $Date: 2001/08/13 21:16:46 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.commons.workflow.demo;
import java.io.File;
import org.apache.commons.digester.Digester;
import org.apache.commons.workflow.Activity;
import org.apache.commons.workflow.Context;
import org.apache.commons.workflow.base.BaseContext;
/**
* <p>Demonstration program to illustrate how the Workflow Management System
* is utilized. It accepts a command line argument to an XML file that
* contains an <code><activity></code> to be parsed and then executed.
* If no file is specified, a default XML document will be utilized.</p>
*
* <p><strong>WARNING</strong> - This program is for illustration only while
* the workflow management system is being developed, and it will not be
* part of the final package. Indeed, much of its functionality (such as
* the parsing of XML files describing activities) will need to be encapsulated
* inside the system, in ways that support the per-namespace step definitions
* as outlined in the original proposal.</p>
*
* <p><strong>WARNING</strong> - This code depends on the version of Digester
* currently in CVS - the 1.0 released version will not work correctly with
* namespace prefixes.</p>
*
* <p><strong>WARNING</strong> - The namespace URLs in the example XML document
* are not official - they are simply used to satisfy the syntax requirements
* of the XML parser. Official namespace URIs <em>will</em> be required for a
* formal release of this technology, because that is key to the extensibility
* of Step implementations.</p>
*
* @version $Revision: 1.1 $ $Date: 2001/08/13 21:16:46 $
* @author Craig R. McClanahan
*/
public class Main {
// ----------------------------------------------------------- Main Program
/**
* The main program for the demo.
*
* @param args Command line arguments
*/
public static void main(String args[]) {
// Make sure there is a filename argument
if (args.length != 1) {
System.out.println("Usage: java org.apache.commons.workflow.demo.Main
{XML-file}");
System.exit(1);
}
// Construct and utilize a new instance of this class
Main main = new Main();
main.process(args[0]);
}
// ----------------------------------------------------- Instance Variables
/**
* The Activity constructed by our Digester.
*/
protected Activity activity = null;
/**
* The Digester used to process input files.
*/
protected Digester digester = null;
// ------------------------------------------------------------ Constructor
/**
* Construct a new instance of this class to process input files.
*/
public Main() {
super();
digester = createDigester();
}
// -------------------------------------------------------- Support Methods
/**
* <p>Create a Digester instance that knows how to parse activities using
* the <code>core</code> and <code>io</code> built-in Steps.</p>
*
* <p><strong>WARNING</strong> - This will ultimately be abstracted into
* a mechanism to register the set of rule definitions associated with
* a namespace.</p>
*/
protected Digester createDigester() {
// Construct and configure a new Digester instance
Digester digester = new Digester();
// digester.setDebug(999);
digester.setNamespaceAware(true);
digester.setValidating(false);
digester.push(this);
// Add rules to recognize the built-in steps that we know about
digester.addObjectCreate
("activity",
"org.apache.commons.workflow.base.BaseActivity");
digester.addSetProperties
("activity");
digester.addSetNext
("activity",
"setActivity",
"org.apache.commons.workflow.Activity");
digester.addObjectCreate
("activity/core:duplicate",
"org.apache.commons.workflow.core.DuplicateStep");
digester.addSetProperties
("activity/core:duplicate");
digester.addSetNext
("activity/core:duplicate",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:exit",
"org.apache.commons.workflow.core.ExitStep");
digester.addSetProperties
("activity/core:exit");
digester.addSetNext
("activity/core:exit",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:get",
"org.apache.commons.workflow.core.GetStep");
digester.addSetProperties
("activity/core:get");
digester.addSetNext
("activity/core:get",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:pop",
"org.apache.commons.workflow.core.PopStep");
digester.addSetProperties
("activity/core:pop");
digester.addSetNext
("activity/core:pop",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:put",
"org.apache.commons.workflow.core.PutStep");
digester.addSetProperties
("activity/core:put");
digester.addSetNext
("activity/core:put",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:remove",
"org.apache.commons.workflow.core.RemoveStep");
digester.addSetProperties
("activity/core:remove");
digester.addSetNext
("activity/core:remove",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:string",
"org.apache.commons.workflow.core.StringStep");
digester.addSetProperties
("activity/core:string");
digester.addSetNext
("activity/core:string",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:suspend",
"org.apache.commons.workflow.core.SuspendStep");
digester.addSetProperties
("activity/core:suspend");
digester.addSetNext
("activity/core:suspend",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/core:swap",
"org.apache.commons.workflow.core.SwapStep");
digester.addSetProperties
("activity/core:swap");
digester.addSetNext
("activity/core:swap",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/io:display",
"org.apache.commons.workflow.io.DisplayStep");
digester.addSetProperties
("activity/io:display");
digester.addSetNext
("activity/io:display",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/io:get",
"org.apache.commons.workflow.io.GetStep");
digester.addSetProperties
("activity/io:get");
digester.addSetNext
("activity/io:get",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/io:peek",
"org.apache.commons.workflow.io.PeekStep");
digester.addSetProperties
("activity/io:peek");
digester.addSetNext
("activity/io:peek",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/io:read",
"org.apache.commons.workflow.io.ReadStep");
digester.addSetProperties
("activity/io:read");
digester.addSetNext
("activity/io:read",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/io:write",
"org.apache.commons.workflow.io.WriteStep");
digester.addSetProperties
("activity/io:write");
digester.addSetNext
("activity/io:write",
"addStep",
"org.apache.commons.workflow.Step");
digester.addObjectCreate
("activity/web:forward",
"org.apache.commons.workflow.web.ForwardStep");
digester.addSetProperties
("activity/web:forward");
digester.addSetNext
("activity/web:forward",
"addStep",
"org.apache.commons.workflow.Step");
/* FIXME - pick correct implementation for Servlet 2.2 or 2.3!
digester.addObjectCreate
("activity/web:include",
"org.apache.commons.workflow.web.IncludeStep");
digester.addSetProperties
("activity/web:include");
digester.addSetNext
("activity/web:include",
"addStep",
"org.apache.commons.workflow.Step");
*/
// Return the completed instance
return (digester);
}
/**
* Save the Activity that our Digester has constructed.
*
* @param activity The newly constructed Activity
*/
public void setActivity(Activity activity) {
this.activity = activity;
}
/**
* Process the specified file.
*
* @param pathname Pathname of the specified XML file containing
* an activity definition
*/
public void process(String pathname) {
// Parse the activity definition
try {
System.out.println("Main: Parsing activity file " + pathname);
digester.parse(new File(pathname));
} catch (Throwable t) {
t.printStackTrace(System.out);
return;
}
// Create a context and execute this activity
try {
System.out.println("Main: Executing parsed activity");
Context context = new BaseContext();
context.setActivity(activity);
context.execute();
} catch (Throwable t) {
t.printStackTrace(System.out);
return;
}
}
}
1.1
jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/demo/main.xml
Index: main.xml
===================================================================
<activity id="Demostration Activity"
xmlns:core="http://jakarta.apache.org/workflow/core";
xmlns:io="http://jakarta.apache.org/workflow/io";
xmlns:web="http://jakarta.apache.org/workflow/web";>
<core:string value="This is a string value"/>
<core:put name="foo"/>
<core:get name="foo" scope="local"/>
<io:peek/>
</activity>
