Distributed Object Architectures With Corba

by Henry Balen , With Mark Elenko , Jan Jones , Gordon Palumbo

• ISBN13: 9780521654180
• ISBN10: 0521654181
• Format: Paperback
• Copyright: 2000-02-13
• Publisher: Cambridge University Press

Summary

Distributed Object Architectures with CORBA is a guide to creating a software architecture comprising distributed components. While it is based on OMG's Common Object Request Broker Architecture (CORBA) standard, the principles also apply to architecture built with other technology (such as Microsoft's DCOM). As ORB products evolve to incorporate new additions to CORBA, the knowledge and experience required to build stable and scalable systems is not widespread. With this book the reader can develop the skills and knowledge that is necessary for building such systems. The book assumes a familiarity with object-oriented concepts and the basics of CORBA. Software developers who are new to building systems with CORBA-based technologies will find this book a useful guide to effective development.

Table of Contents

Foreword	xvii
Acknowledgments	xix
Introduction	1	(12)
What Architecture Is	1	(1)
Why Architecture Is Important	2	(2)
Distributed Architectures	4	(1)
The OMG and CORBA	5	(2)
Purpose and Scope	7	(1)
Intended Audience	8	(1)
Organization of Contents	8	(3)
Distributed Objects	9	(1)
Partitioning, Interfaces, and Granularity	9	(1)
Meta-Information	9	(1)
Life Cycle and Persistence	9	(1)
Transactions	10	(1)
Security	10	(1)
COBRA and the Internet	10	(1)
Architecture Considerations for Deployment	10	(1)
Appendix: COM/CORBA Integration	10	(1)
References	11	(2)
Distributed Objects	13	(24)
Quick Review of Object-Oriented Concepts	13	(5)
Objects, Classes, and inheritance	14	(2)
Encapsulation	16	(1)
Polymorphism	16	(1)
Patterns and Components	16	(2)
Object Based Distribution	18	(2)
What CORBA Provides	20	(5)
OMG IDL	21	(1)
CORBA Interoperability	22	(1)
Object adapters	23	(1)
Services	23	(2)
What CORBA Does Not Provide	25	(5)
Semantics	25	(3)
Interoperable naming service	28	(1)
Interface versioning	28	(1)
Objects by value	29	(1)
Messaging	29	(1)
System management	30	(1)
Service-Oriented Architecture	30	(1)
Integration Strategies with Existing Systems	31	(6)
Integration strategy for a database	33	(1)
Integration strategy for a library	34	(1)
Integration strategy for an application	34	(1)
Summary	35	(1)
References	36	(1)
Notes	36	(1)
Partitioning, Interfaces, and Granularity	37	(30)
The Project Life Cycle	38	(1)
Partitioning	39	(2)
Interfaces	41	(6)
Cohesion	42	(2)
Coupling	44	(2)
Exceptions	46	(1)
Polymorhism	47	(1)
Granularity	47	(4)
Granularity and coupling	48	(2)
Granularity and performance	50	(1)
Example: Document Retrieval	51	(13)
Object model	51	(3)
Partitioning	54	(2)
Initial Interface Definition	56	(4)
Refinements	60	(4)
Summary	64	(1)
References	65	(2)
Meta-Information	67	(30)
Examples of Using Meta-Information	68	(2)
Document repository	68	(2)
Package descriptions	70	(1)
Meta-Information in CORBA	70	(24)
Naming Service	71	(7)
Implementation Repository	78	(1)
Interface Repository	79	(5)
Dynamic Interface Invocation	84	(5)
Dynamic Skeleton Interface	89	(2)
Meta-Object Facility	91	(1)
Trader	92	(2)
Summary	94	(1)
References	94	(1)
Notes	95	(2)
Life Cycle And Persistence	97	(28)
Life Cycle	98	(8)
Life cycle support implementations	99	(7)
Distributed Object Life Cycle	106	(6)
Life cycle service	106	(6)
Persistence	112	(10)
Know when to save, know when to load	113	(1)
Knowing how to save and load	114	(1)
Where to save and load	115	(1)
Persistence layers	116	(1)
Vendor approaches	117	(1)
POA possibilities	118	(2)
The service approach	120	(1)
The component quest	121	(1)
Persistent conclusions	121	(1)
Life Cycle IDL (Partial)	122	(1)
Summary	123	(1)
Notes	123	(2)
Transactions	125	(36)
Transaction Processing	126	(12)
Transactions	127	(1)
Database systems and TP monitors	128	(2)
Resource manager	130	(1)
Transaction manager	131	(1)
Locks	132	(1)
Lock granularity	133	(1)
Deadlock	134	(1)
Two-phase commit	135	(3)
The OMG Object Transaction Service	138	(17)
Transaction model	139	(1)
Basic OTS programming model	140	(1)
Interfaces	141	(2)
Programming models	143	(1)
Transaction context propagation	143	(1)
Context management	144	(1)
Exceptions	144	(1)
Recoverable resources	145	(5)
Synchronization objects	150	(2)
Nested transactions	152	(1)
Example: transactional document management	152	(3)
Concurrency Control Service	155	(4)
Model	155	(2)
Using the CCS	157	(2)
Summary	159	(1)
References	160	(1)
Notes	160	(1)
Security	161	(32)
Security Principles	162	(6)
Elements of security	162	(1)
Security threats	163	(2)
Security functionality (features)	165	(1)
Developing a security policy	166	(2)
Review of the OMG Security Service	168	(22)
Security model	172	(3)
Principals, authentication, and credentials	175	(4)
Security context	179	(1)
Domains	179	(4)
Delegation	183	(2)
Authorization/access control	185	(1)
Privacy and integrity of messages	186	(1)
Audit	186	(1)
Nonrepudiation	187	(2)
Security interoperability	189	(1)
SSL and CORBA	190	(1)
Summary	191	(1)
References	192	(1)
Notes	192	(1)
CORBA and the Internet	193	(24)
Architectures	193	(9)
CORBA Web clients	194	(2)
Web server/ORB gateway	196	(6)
IIOP and Firewalls	202	(7)
Firewall technology	203	(1)
Filters	203	(2)
Proxies	205	(1)
HTTP tunneling	206	(1)
IIOP proxies	207	(2)
HTTP-NG	209	(1)
XML and CORBA	210	(5)
Quic tour of XML	210	(3)
How XML fits in with CORBA	213	(2)
Summary	215	(1)
References	216	(1)
Architecture Considerations for Deployment	217	(30)
Required Characteristics	217	(2)
Keeping Track	219	(10)
Logging	220	(3)
Monitoring	223	(5)
Auditing	228	(1)
Achieving Fail-over	229	(4)
Issues of state	229	(1)
The act of failure	230	(1)
The switch	231	(2)
Load Balancing	233	(13)
Metrics on requests	233	(1)
Metrics on machines	234	(1)
Usage metrics	235	(1)
Global metrics	235	(1)
The balancing act	235	(1)
What to balance	236	(1)
Balancing by Naming Service	237	(2)
Balancing by OAD	239	(1)
Naming Service/OAD summary	240	(1)
Balancing by work	240	(6)
Summary	246	(1)
Appendix: COM/CORBA Integration	247	(20)
From Whence We COM	247	(1)
Motivation	248	(1)
In Terms of COM	248	(1)
Bridging the Gap	249	(1)
Metamodel	250	(7)
Object life cycle and identity	251	(2)
Interface and interface identity	253	(1)
Interface composition	254	(2)
Requests	256	(1)
Parameters	257	(1)
Type Mapping	257	(5)
Basic types	258	(1)
Complex types	258	(1)
Exceptions	258	(4)
Integration	262	(2)
COM and Automation objects from CORBA clients	262	(1)
CORBA objects from COM and Automation clients	263	(1)
Distribution	264	(1)
Deployment models	264	(1)
References	265	(2)
Index	267