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Concurrent - Programming in Java.pdf
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Concurrent - Programming in Java.pdf,ppt,Doug Lea
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Concurrent Programming in Java
1
Concurrent
Programming in Java
Doug Lea
State University of New York at Oswego
dl@cs.oswego.edu
http://gee.cs.oswego.edu
Concurrent Programming in Java
2
Topics
Concurrency
Models, design forces, Java
Designing objects for concurrency
Immutability, locking, state dependence, containment, splitting
Introducing concurrency into applications
Autonomous loops, oneway messages, interactive messages,
cancellation
Concurrent application architectures
Flow, parallelism, layering
Libraries
Using, building, and documenting reusable concurrent classes
Concurrent Programming in Java
3
About These Slides ...
Some slides are based on joint presentations with David Holmes,
Macquarie University, Sydney Australia.
More extensive coverage of most topics can be found in the book
Concurrent Programming in Java
, Addison-Wesley
and the online supplement
http://gee.cs.oswego.edu/dl/cpj
The printed slides contain much more material than can be covered
in a tutorial. They include extra backgound, examples, and
extensions. They are not always in presentation order.
Java code examples often omit qualifiers, imports, etc for space
reasons. Full versions of most examples are available from the
CPJ online supplement.
None of this material should be construed as official Sun
information.
Java is a trademark of Sun Microsystems, Inc.
Concurrent Programming in Java
4
Concurrency
Why?
Availability
Minimize response lag, maximize throughput
Modelling
Simulating autonomous objects, animation
Parallelism
Exploiting multiprocessors, overlapping I/O
Protection
Isolating activities in threads
Why Not?
Complexity
Dealing with safety, liveness, composition
Overhead
Higher resource usage
Concurrent Programming in Java
5
Common Applications
I/O-bound tasks
• Concurrently access web pages, databases, sockets ...
GUIs
• Concurrently handle events, screen updates
Hosting foreign code
• Concurrently run applets, JavaBeans, ...
Server Daemons
• Concurrently service multiple client requests
Simulations
• Concurrently simulate multiple real objects
Common examples
• Web browsers, web services, database servers,
programming development tools, decision support tools
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