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Autonomic Computing Expression Language

Dakshi Agrawal, Research Staff Member, IBM

Dakshi Agrawal is a Research Staff Member at the IBM T. J. Watson Research Center. Dr. Agrawal received a Ph.D. in Electrical Engineering in 1999 from the University of Illinois at Urbana-Champaign (UIUC). He worked as a Visiting Assistant Professor at UIUC before joining the IBM T. J. Watson Research Center. Dr. Agrawal has more than 30 publications in international conferences and journals in the area of digital communication theory, distributed computing systems, and digital security and privacy. View his Web site at http://www.research.ibm.com/people/a/agrawal. Dakshi Agrawal, James Giles, and Kang-Won Lee were core contributors to the development of the Policy Management Toolkit for the IBM Autonomic Computing Initiative, and received an IBM Research Division Award and Invention Achievement Award for this contribution.

James Giles, Assistant Professor, University of Evansville, Indiana

James Giles is an assistant professor of Electrical Engineering/Computer Science at the University of Evansville, Indiana. He was a research staff member at the IBM T. J. Watson Research Center from 2000-2004. Dr. Giles received a Ph.D. in Electrical Engineering in 2000 from the University of Illinois at Urbana-Champaign (UIUC). He has published many technical articles in international conferences and journals in the area of digital communications, networking, distributed computing, and computer security. View his Web site at http://www.research.ibm.com/people/g/gilesjam. Dakshi Agrawal, James Giles, and Kang-Won Lee were core contributors to the development of the Policy Management Toolkit for the IBM Autonomic Computing Initiative, and received an IBM Research Division Award and Invention Achievement Award for this contribution.

Kang-Won Lee, Research Staff Member, IBM

Kang-Won Lee is a Research Staff Member at the IBM T. J. Watson Research Center. He is currently working on policy-based storage area network planning and verification. Dr. Lee received his Ph.D. in Computer Science from the University of Illinois at Urbana-Champaign in 2000. Dr. Lee has published more than 35 technical articles in premier journals and conferences in the area of computer networks, distributed systems, and policy-based systems management. View his Web site at http://www.research.ibm.com/people/k/kangwon. Dakshi Agrawal, James Giles, and Kang-Won Lee were core contributors to the development of the Policy Management Toolkit for the IBM Autonomic Computing Initiative, and received an IBM Research Division Award and Invention Achievement Award for this contribution.

Jorge Lobo, Research Staff Member, IBM

Jorge Lobo is a Research Staff Member at the IBM T. J. Watson Research Center. Prior to joining IBM he was a principal architect at Teltier Technologies. Before Teltier he was a tenured associate professor of Computer Science at the University of Illinois at Chicago and a member of the Network Computing Research Department at Bell Labs. At Teltier he developed a policy server for the availability management of Presence Servers. He also designed and codeveloped PDL, one of the first generic policy languages for network management. Dr. Lobo has more than 50 publications in international journals and conferences in the areas of networks, databases and artificial intelligence. He is co-author of a Massachusetts Institute of Technology (MIT) book on logic programming and is the cofounder and a member of the steering committee for the IEEE Policy Workshop. He has a Ph.D. in Computer Science from the University of Maryland. View his Web site at http://www.research.ibm.com/people/j/jlobo.

Summary: This tutorial shows how to use Autonomic Computing Expression Language (ACEL) in your XML document. It takes a user step-by-step through the process of creating an XML document with ACEL expressions, parsing the XML document, and evaluating ACEL expressions contained in the XML document.

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Date: 28 Feb 2005
Level: Introductory

Activity: 5222 views
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Before you start

About this tutorial

This tutorial shows how to use the Autonomic Computing Expression Language (ACEL), an XML-based expression language, to create an expression, parse it, prepare input for it, and evaluate it. ACEL was originally developed as a part of the Autonomic Computing Policy Language to describe conditions when a policy should be applied to a managed system. To learn more about how policies can be used to manage an IT system, download IBM® Policy Management for Autonomic Computing (PMAC) from alphaWorks. (See Resources for more information.) However, ACEL is applicable in many other contexts such as specifying service level agreements, pricing, scheduling, and provisioning of services. In general, ACEL can be used to specify various types of expressions (numeric expression, Boolean expression, string expression, and so on) in XML documents.

The distinguishing features of ACEL are:

ACEL provides a rich set of datatypes and functions, allowing a simple representation of most expressions required for system management.
ACEL is a strongly typed language, and its XML schema enforces most of the type constraints. As a result, ACEL expressions can be validated in plain XML editors to allow easy authoring of ACEL expressions.
ACEL can be extended by a deployer such that it retains its typed property. Therefore, even the extended ACEL expressions can be validated in a plain XML editor.
ACEL includes a comprehensive time zone specification, with date and time values allowing unambiguous treatment of time instances even in the presence of daylight saving time.

Prerequisites

This tutorial is for an intermediate-level software developer who wants to acquire knowledge of how to embed ACEL expressions in XML files and use them for various applications such as business rules and policy management. The prerequisites for taking the tutorial are a basic knowledge of Java programming and a general understanding of XML schema and processing. You can download the examples in this tutorial, the ACEL JAR file, and the companion document ACEL User's Guide , which presents the complete syntax and semantics of the ACEL expressions with examples. See Resources for more information.

To run the examples in this tutorial, you must install the Java Runtime Environment (JRE) Version 1.4.x. See Resources for links to appropriate run-time environments.

The specific examples in the tutorial are written for IBM WebSphere® Studio Application Developer (Application Developer). You can download a trial version of IBM WebSphere Studio Application Developer. Other Java programming environments can be used, but the required steps might be different than those shown in the tutorial.

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