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authorWilliam R. Otte <wotte@dre.vanderbilt.edu>2008-03-04 13:56:48 +0000
committerWilliam R. Otte <wotte@dre.vanderbilt.edu>2008-03-04 13:56:48 +0000
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-This document is also available at the following URL:
-
-http://www.cs.wustl.edu/~schmidt/ACE.html
-
-All software and documentation is available via both anonymous ftp and
-the World Wide Web.]
-
-THE ADAPTIVE COMMUNICATION ENVIRONMENT (ACE)
-
-An Object-Oriented Network Programming Toolkit
-
-----------------------------------------
-
-Overview of ACE
-
-The ADAPTIVE Communication Environment (ACE) is an object-oriented
-(OO) toolkit that implements fundamental design patterns for
-communication software. ACE provides a rich set of reusable C++
-wrappers and frameworks that perform common communication software
-tasks across a range of OS platforms, including Win32 (i.e., WinNT
-3.5.x/4.x, Win95, and WinCE), most versions of UNIX (e.g., SunOS 4.x
-and 5.x, SGI IRIX 5.x and 6.x, HP-UX 9.x, 10.x, and 11.x, DEC UNIX
-4.x, AIX 4.x, Linux, SCO, UnixWare, NetBSD, and FreeBSD), real-time
-operating systems (e.g., VxWorks, Chorus, LynxOS, and pSoS), and MVS
-OpenEdition. A single source tree is used for all these platforms and
-porting ACE to other platforms is relatively easy.
-
-The communication software components provided by ACE include event
-demultiplexing and event handler dispatching, service initialization,
-interprocess communication, shared memory management, message routing,
-dynamic (re)configuration of distributed services, multi-threading,
-and concurrency control. There are both C++ and Java versions of ACE
-available.
-
-ACE is targeted for developers of high-performance and real-time
-communication services and applications on UNIX, POSIX, and Win32
-platforms. ACE simplifies the development of OO network applications
-and services that utilize interprocess communication, event
-demultiplexing, explicit dynamic linking, and concurrency. ACE
-automates system configuration and reconfiguration by dynamically
-linking services into applications at run-time and executing these
-services in one or more processes or threads.
-
-ACE is currently used in commercial projects and products by dozens of
-companies including Ericsson, Bellcore, Siemens, Motorola, Kodak,
-Boeing, Lucent, DEC, Lockheed Martin, and SAIC. Commercial support
-for ACE is available at http://www.riverace.com.
-
-----------------------------------------
-
-C++ Wrappers for OS Interfaces
-
-The lower-level portions of ACE provide a set of portable and
-type-secure C++ wrappers that encapsulate the following C language OS
-interfaces:
-
- . IPC mechanisms
- -- e.g., Internet- and UNIX-domain sockets, TLI, Named
- Pipes (for UNIX and Win32) and STREAM pipes;
-
- . Event demultiplexing
- -- e.g., select(), poll(), and Win32
- WaitForMultipleObjects and I/O completion ports;
-
- . Multi-threading and synchronization
- -- e.g., Solaris threads, POSIX Pthreads, and Win32
- threads;
-
- . Explicit dynamic linking
- -- e.g., dlopen/dlsym on UNIX and LoadLibrary/GetProc
- on Win32;
-
- . Memory-mapped files and shared memory management
- -- e.g., BSD mmap(), SYSV shared memory, and Win32
- shared memory;
-
- . System V IPC
- -- e.g., shared memory, semaphores, message queues.
-
-The OS Adaptation Layer shields the upper levels of ACE from platform
-dependencies associated with the underlying OS interfaces.
-
-----------------------------------------
-
-Frameworks and Class Categories
-
-ACE also contains a higher-level network programming framework that
-integrates and enhances the lower-level C++ wrappers. This framework
-supports the dynamic configuration of concurrent distributed services
-into applications. The framework portion of ACE contains the
-following class categories:
-
- . The Reactor
- -- Supports both Reactive and Proactive I/O;
-
- . The Service Configurator
- -- Support dynamic (re)configuration of objects;
-
- . The ADAPTIVE Service Executive
- -- A user-level implementation of System V STREAMS,
- that supports modular integration of
- hierarchically-related communicaion services;
-
- . Concurrency
- -- Various types of higher-level concurrency
- control and synchronization patterns (such as
- Polymorphic Futures and Active Objects);
-
- . Shared Malloc
- -- Components for managing dynamically allocation
- of shared and local memory;
-
-----------------------------------------
-
-Distributed Services and Components
-
-Finally, ACE provides a standard library of distributed services that
-are packaged as components. These service components play two roles
-in ACE:
-
- 1. They provide reusable components for common distributed
- system tasks such as logging, naming, locking, and time
- synchronization.
-
- 2. They illustrate how to utilize ACE features such as the
- Reactor, Service Configurator, Service Initialization,
- Concurrency, and IPC components.
-
-----------------------------------------
-
-Middleware Applications
-
-ACE has been used in research and development projects at many
-universities and companies. For instance, it has been used to build
-avionics systems at Boeing, telecommunication systems at Bellcore,
-Ericsson, Motorola, and Lucent; medical imaging systems at Siemens and
-Kodak; and many academic research projects. Two example middleware
-applications provided with the ACE release include:
-
- 1. The ACE ORB (TAO) -- TAO is a real-time implementation of
- CORBA built using the framework components and patterns
- provided by ACE.
-
- 2. JAWS -- JAWS is a high-performance, adaptive Web server
- built using the components in ACE.
-
-----------------------------------------
-
-OBTAINING ACE
-
-The current ACE release is provided as a tar file that is around 3 Meg
-compressed using GNU gzip. ACE may be obtained electronically from
-http://www.cs.wustl.edu/~schmidt/ACE-obtain.html. This release
-contains the source code, test drivers, and example applications
-(including JAWS) for C++ wrapper libraries and the higher-level ACE
-network programming framework developed as part of the ADAPTIVE
-project at the University of California, Irvine and at Washington
-University, St. Louis.
-
-You can get The ACE ORB (TAO) in a companion release at
-http://www.cs.wustl.edu/~schmidt/TAO.html.
-
-----------------------------------------
-
-ACE DOCUMENTATION AND TUTORIALS
-
-Many of the C++ wrappers and higher-level components have been
-described in issues of the C++ Report, as well as in proceedings of
-many journals, conferences, and workshops.
-
-A collection of white papers and tutorial handouts are included at
-ftp://wuarchive.wustl.edu/languages/c++/ACE/ACE-documentation. This
-directory contains postscript versions of various papers that describe
-different aspects of ACE.
-
-I update these papers periodically to reflect changes to the ACE
-architecture. Therefore, you might want to check the date on the
-files to make sure that you have read the most recent versions of
-these papers.
-
-This material is also available available via the WWW at URL:
-
-http://www.cs.wustl.edu/~schmidt/ACE.html
-
-----------------------------------------
-
-ACE MAILING LIST AND NEWSGROUP
-
-A mailing list, ace-users@cs.wustl.edu, is available for discussing
-bug fixes, enhancements, and porting issues regarding ACE. Please
-send mail to me at the ace-users-request@cs.wustl.edu if you'd like to
-join the mailing list. There is also a USENET newsgroup called
-comp.soft-sys.ace. Please see
-http://www.cs.wustl.edu/~schmidt/ACE-mail.html for details on how to
-subscribe to the mailing list.
-
-----------------------------------------
-
-BUILDING AND INSTALLING ACE
-
-Please refer to the http://www.cs.wustl.edu/~schmidt/ACE-install.html
-file for information on how to build and test the ACE wrappers. The
-BIBLIOGRAPHY file contains information on where to obtain articles
-that describe the ACE wrappers and the ADAPTIVE system in more detail.
-
-The current release has been tested extensively, but if you find any
-bugs, please report them to the ACE mailing list
-ace-users@cs.wustl.edu using the $ACE_ROOT/PROBLEM-REPORT-FORM.
-Please use the same form to submit questions, comments, etc.
-To ensure that you see responses, please do one of the following:
-
- 1) Subscribe to the ace-users mail list, by sending email with
- contents "subscribe ace-users" to majordomo@cs.wustl.edu.
-
- 2) Or, monitor the comp.soft-sys.ace newsgroup for responses.
-
-----------------------------------------
-
-ACKNOWLEDGEMENTS
-
-Please see the file `$ACE_ROOT/THANKS' for a list of the thousands of
-people who've contributed to ACE and TAO over the years.