src.openwfe.org.engine.expressions.InterleavedExpression Maven / Gradle / Ivy
/*
* Copyright (c) 2005-2006, John Mettraux, OpenWFE.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* . Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* . 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.
*
* . Neither the name of the "OpenWFE" nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
*
* $Id: InterleavedExpression.java 2667 2006-05-24 22:33:06Z jmettraux $
*/
//
// InterleavedExpression.java
//
// [email protected]
//
// generated with
// jtmpl 1.0.04 20.11.2001 John Mettraux ([email protected])
//
package openwfe.org.engine.expressions;
//import openwfe.org.engine.Definitions;
import openwfe.org.engine.workitem.InFlowWorkItem;
/**
* An expression directly implementing the "interleaved parallel routing"
* pattern of the workflow patterns (http://www.workflowpatterns.com) (pat #17).
*
* CVS Info :
*
$Author: jmettraux $
*
$Date: 2006-05-25 00:33:06 +0200 (Thu, 25 May 2006) $
*
$Id: InterleavedExpression.java 2667 2006-05-24 22:33:06Z jmettraux $
*
* @author [email protected]
*/
public class InterleavedExpression
extends CleanCompositeFlowExpression
{
private final static org.apache.log4j.Logger log = org.apache.log4j.Logger
.getLogger(InterleavedExpression.class.getName());
//
// FIELDS
//
// CONSTRUCTORS
//
// BEAN METHODS
//
// METHODS
public void apply (final InFlowWorkItem wi)
throws ApplyException
{
if (getChildren().size() < 1)
{
applyToParent(wi);
return;
}
final double d = Math.random();
final int index = (int)(d * (double)getChildren().size());
if (log.isDebugEnabled())
log.debug("apply() d is "+d+" index is "+index);
final FlowExpressionId nextId =
(FlowExpressionId)getChildren().get(index);
getExpressionPool().apply(nextId, wi);
}
public void reply (final InFlowWorkItem wi)
throws ReplyException
{
final FlowExpressionId replyingId = wi.getLastExpressionId();
if (log.isDebugEnabled())
log.debug("reply() from "+replyingId);
getChildren().remove(replyingId);
this.storeItself();
try
{
apply(wi);
}
catch (final ApplyException e)
{
throw new ReplyException
("failed to apply next (random) child", e);
}
}
}