Source Code Cross Referenced for DirectInvocable.java in  » Workflow-Engines » wfmopen-2.1.1 » de » danet » an » workflow » tools » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » wfmopen 2.1.1 » de.danet.an.workflow.tools.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * This file is part of the WfMOpen project.
03:         * Copyright (C) 2001-2004 Danet GmbH (www.danet.de), GS-AN.
04:         * All rights reserved.
05:         *
06:         * This program is free software; you can redistribute it and/or modify
07:         * it under the terms of the GNU General Public License as published by
08:         * the Free Software Foundation; either version 2 of the License, or
09:         * (at your option) any later version.
10:         *
11:         * This program is distributed in the hope that it will be useful,
12:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
13:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14:         * GNU General Public License for more details.
15:         *
16:         * You should have received a copy of the GNU General Public License
17:         * along with this program; if not, write to the Free Software
18:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19:         *
20:         * $Id: DirectInvocable.java,v 1.2 2006/09/29 12:32:09 drmlipp Exp $
21:         *
22:         * $Log: DirectInvocable.java,v $
23:         * Revision 1.2  2006/09/29 12:32:09  drmlipp
24:         * Consistently using WfMOpen as projct name now.
25:         *
26:         * Revision 1.1.1.1  2004/08/18 15:17:39  drmlipp
27:         * Update to 1.2
28:         *
29:         * Revision 1.3  2004/07/14 14:54:37  lipp
30:         * Restrictions for being direct invocable relaxed a bit.
31:         *
32:         * Revision 1.2  2004/04/13 14:33:57  lipp
33:         * Clarify comment.
34:         *
35:         * Revision 1.1  2004/04/12 19:33:52  lipp
36:         * Clarified application invocation interface.
37:         *
38:         */
39:        package de.danet.an.workflow.tools.util;
40:
41:        /**
42:         * This interface marks a tool agent as requiring no or only read-only
43:         * access to the activity passed to {@link
44:         * de.danet.an.workflow.spis.aii.ToolAgent#invoke
45:         * <code>invoke</code>}. <P>
46:         *
47:         * The issue arises from the necessity to invoke the tool agent in its
48:         * own transaction. In order to provide the tool agent with full
49:         * access to the activity, the activity must not be involved in
50:         * another transaction. However, as tool agent invocation obviously
51:         * updates the state of the activity, the activity (having its state
52:         * updated) is involved in a transaction when the tool agent is
53:         * invoked. To resolve this, WfMOpen does not invoke the tool agent
54:         * directly. Rather, its sends a message to a tool agent invocation
55:         * queue as part of the state update transaction and completes the
56:         * transaction. The message is then retrieved from the queue and the
57:         * tool agent is invoked without involving the activity in the message
58:         * handling transaction.<P>
59:         *
60:         * Of course, this induces a considerable overhead which can be
61:         * avoided if the tool agent accesses the activity not at all or uses
62:         * only the methods <code>key</code>, <code>activityUniqueKey</code>
63:         * or <code>container</code>. Experience shows that this is true for a
64:         * lot of tool agents; either because they let an application running
65:         * in another thread or process do the work, or because they use the
66:         * <code>ResultProvider</code> interface and do not require access to
67:         * the activity. If a tool agent satisfies these criteria, it may make
68:         * this known to the workflow engine by implementing this marker
69:         * interface. If a tool agent implements this interface, the engine
70:         * does not put a message on the tool invocation queue but rather
71:         * invokes the tool agent directly during state update. <P>
72:         *
73:         * Note that since the activity is involved in the state update
74:         * transaction, the engine cannot call <code>setResult</code> and
75:         * <code>complete</code> in a new transaction after tool agent
76:         * invocation. Rather, these methods will be called in the same
77:         * transaction as the tool agent invocation. Thus if
78:         * <code>RemoteException</code>s occur when these methods are called
79:         * by the workflow engine, the complete transaction, including the
80:         * tool invocation, will be repeated. Tools that are "expensive" to
81:         * execute or have side effects should not implement
82:         * <code>DirectInvocable</code>.
83:         *
84:         * @author <a href="mailto:mnl@mnl.de">Michael N. Lipp</a>
85:         * @version $Revision: 1.2 $
86:         */
87:
88:        public interface DirectInvocable {
89:        }
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