Toward Automated Support for Transparent Interoperable Queries
Pages 387 - 406
Abstract
Many Object-Oriented Databases (OODBs) use programming languages that predate Java, such as C++, CLOS and Smalltalk. Thus, there is a growing need for interoperating these OODBs with new applications that require Java. Unfortunately, there are few mechanisms that allow software developers to easily integrate Java applications with non-Java OODBs. Although various interoperability mechanisms have been developed over the years, these approaches have some significant drawbacks in practice. They are often difficult to use, provide little, if any, automated support, and produce software that is difficult to engineer and maintain. In this paper, we describe an interoperability approach that allows application developers to seamlessly and transparently access non-Java OODBs from Java applications. We first present JOQL, a Java-based object query language that we are developing. JOQL queries are embedded in Java applications and are used to perform queries over C++-based OODBs. We also describe an accompanying toolset that processes Java programs containing JOQL queries. The toolset produces all the necessary code allowing Java applications to access and manipulate a C++-based OODB. As a result, application developers are free to work in Java without having to concern themselves with the details of interoperating with C++. Finally, we provide some preliminary experimental data that demonstrates our approach incurs a reasonable performance overhead.
References
[1]
{1} S. Alagic, The ODMG object model: Does it make sense? in: Proceedings of the ACM SIGPLAN Conference on Object-Oriented Programming Systems, Languages and Applications (OOPSLA-97), ACM SIGPLAN Notices, Vol. 32(10), New York, October 1997 (ACM Press, 1997) pp. 253-270.
[2]
{2} Ardent java O2 binding, World Wide Web URL (1998). http://www.ardentsoftware.com/object/ papers/JavaBinding.html.
[3]
{3} D. J. Barrett, A. Kaplan and J. C. Wileden, Automated support for seamless interoperability in polylingual software systems, in: The 4th Symposium on the Foundations of Software Engineering, San Francisco, CA, October 1996.
[4]
{4} P. Butterworth, A. Otis and J. Stein, The GemStone object database management system, Communications of the ACM 34(10) (1991) 64-77.
[5]
{5} M. Carey, D. Dewitt and J. Naughton, The OO7 benchmark, in: Proceedings of the 1993 ACM SIGMOD Conference, Washington, DC, May 1993.
[6]
{6} R. Cattell, D. K. Barry, M. Berler, J. Eastman, D. Jordan, C. Russell, O. Schadow, T. Stanienda and F. Velez, eds., The Object Database Standard: ODMG 3.0, Series in Data Management Systems (Morgan Kaufmann, 2000).
[7]
{7} A. B. Chaudhri and M. Loomis, Object Databases in Practice (Prentice-Hall, 1998).
[8]
{8} Georgia Institute of Technolog, Altanta, GA, CUP User's Manual, 0.10g edition, March 1998.
[9]
{9} R. Grehan, Poet goes Java, Byte 22(12) (1997).
[10]
{10} G. Hamilton, R. Cattell and M. Fisher, JDBC Database Access with Java, The Java Series (Addison-Wesley, 1997).
[11]
{11} T. Instruments, Open OODB 1.0 Query Language User Manual (Texas Instruments, Inc., Dallas, TX, 1995).
[12]
{12} B. Janssen and M. Spreitzer, ILU: Inter-language unification via object modules, in: Workshop on Multi-Language Object Models, Portland, OR, August 1994 (in conjunction with OOPSLA'94).
[13]
{13} A. Kaplan, J. V. Ridgway, B. R. Schmerl, K. Sridhar and J. C. Wileden, Toward pure polylingual persistence, in: 9th International Workshop on Persistent Object Systems, Lillehammer, Norway, 2000.
[14]
{14} A. Kaplan, J. V. Ridgway and J. Wileden, Why IDLs are not ideal, in: Proceedings of the 9th IEEE International Workshop on Software Specification and Design, Ise-Shima, Japan, April 1998.
[15]
{15} A. Kaplan and J. C. Wileden, Toward painless polylingual persistence, in: 7th International Workshop on Persistence Object Systems, Cape May, NJ, May 1996.
[16]
{16} C. Lamb, G. Landis, J. Orenstein and D. Weinreb, The ObjectStore database system, Communications of the ACM 34(10) (1991) 50-63.
[17]
{17} Microsoft ODBC 3.0 Programmer's Reference and SDK Guide (1997).
[18]
{18} Object Management Group, The Common Object Request Broker: Architecture and Specification, August 1997, Revision 2.1.
[19]
{19} R. Sessions, COM and DCOM: Microsoft's Vision for Distributed Object (Wiley Computer Publishing, 1997).
[20]
{20} Sun Microsystems, Inc., Cupertino, CA, Java Native Interface Specification, May 1997. http://java. sun.com/products/jdk/1.1/docs/guide/jni/spec/jniTOC.doc.html.
[21]
{21} Sun Microsystems, Inc., Cupertino, CA, JDK 1.1.x Documentation (1998). http://java.sun.com/ products/jdk/1.1/docs/index.html.
[22]
{22} D. L. Wells, J. A. Blakely and C. W. Thompson, Architecture of an open object-oriented management system, IEEE Computer 25(10) (1992) 74-82.
[23]
{23} S. B. Zdonik and D. Maier, Fundamentals of object-oriented databases, in: Readings in Object-Oriented Database Systems, eds. S. B. Zdonik and D. Maier (Morgan Kaufmann, 1990) pp. 1-32.
Index Terms
- Toward Automated Support for Transparent Interoperable Queries
Recommendations
Translation of Object-Oriented Queries to Relational Queries
ICDE '95: Proceedings of the Eleventh International Conference on Data EngineeringProposes a formal approach for translating OODB queries to equivalent relational queries. The translation is accomplished through the use of relational predicate graphs and OODB predicate graphs. One advantage of using such a graph-based approach is ...
Main Memory Orientated Optimization of OO Queries Using Typed Datalog with Foreign Predicates
Object-oriented database systems (OODBs) have created a demand for relationally complete, extensible, and declarative object-oriented query languages. Until now, the runtime performance of such languages was far behind that of procedural OO interfaces. ...
Query Interoperation Among Object-Oriented and Relational Databases
ICDE '95: Proceedings of the Eleventh International Conference on Data EngineeringWe develop an efficient algorithm for the query interoperation among existing heterogeneous object-oriented and relational databases. Our algorithm utilizes a canonical deductive database as a uniform representation of object-oriented schema and data. ...
Comments
Please enable JavaScript to view thecomments powered by Disqus.Information & Contributors
Information
Published In
Copyright © Copyright © 2002 Kluwer Academic Publishers.
Publisher
Kluwer Academic Publishers
United States
Publication History
Published: 01 October 2002
Author Tags
Qualifiers
- Article
Contributors
Other Metrics
Bibliometrics & Citations
Bibliometrics
Article Metrics
- 0Total Citations
- 0Total Downloads
- Downloads (Last 12 months)0
- Downloads (Last 6 weeks)0
Reflects downloads up to 21 Dec 2024