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By Joshua Bloch, Douglas Lea, Brian Goetz, Tim Peierls, Joseph Bowbeer, David Holmes
"I was once lucky certainly to have labored with a wonderful crew at the layout and implementation of the concurrency beneficial properties extra to the Java platform in Java 5.0 and Java 6. Now this similar crew offers the simplest rationalization but of those new gains, and of concurrency quite often. Concurrency is not any longer a topic for complex clients basically. each Java developer should still learn this book."
--Martin Buchholz
JDK Concurrency Czar, solar Microsystems
"For the previous 30 years, machine functionality has been pushed via Moore's legislations; any further, it is going to be pushed by way of Amdahl's legislations. Writing code that successfully exploits a number of processors will be very not easy. Java Concurrency in Practice offers you the strategies and methods had to write secure and scalable Java courses for today's--and tomorrow's--systems."
--Doron Rajwan
Research Scientist, Intel Corp
"This is the booklet you would like if you're writing--or designing, or debugging, or preserving, or contemplating--multithreaded Java courses. If you've ever needed to synchronize a mode and also you weren't yes why, you owe it to your self and your clients to learn this ebook, disguise to cover."
--Ted Neward
Author of Effective firm Java
"Brian addresses the elemental matters and complexities of concurrency with unusual readability. This booklet is a must-read for someone who makes use of threads and cares approximately performance."
--Kirk Pepperdine
CTO, JavaPerformanceTuning.com
"This booklet covers a truly deep and refined subject in a really transparent and concise manner, making it the appropriate Java Concurrency reference handbook. each one web page is stuffed with the issues (and solutions!) that programmers fight with each day. successfully exploiting concurrency is changing into an increasing number of vital now that Moore's legislations is supplying extra cores yet no longer quicker cores, and this publication will provide help to do it."
--Dr. Cliff Click
Senior software program Engineer, Azul Systems
"I have a powerful curiosity in concurrency, and feature most likely written extra thread deadlocks and made extra synchronization errors than so much programmers. Brian's publication is the main readable regarding threading and concurrency in Java, and offers with this hard topic with a superb hands-on strategy. it is a publication i'm recommending to all my readers of The Java Specialists' Newsletter, since it is attention-grabbing, worthwhile, and suitable to the issues dealing with Java builders today."
--Dr. Heinz Kabutz
The Java Specialists' Newsletter
"I've concentrated a profession on simplifying easy difficulties, yet this booklet ambitiously and successfully works to simplify a fancy yet serious topic: concurrency. Java Concurrency in Practice is progressive in its technique, soft and straightforward standard, and well timed in its delivery--it's destined to be a crucial book."
--Bruce Tate
Author of Beyond Java
" Java Concurrency in Practice is a useful compilation of threading knowledge for Java builders. i discovered examining this publication intellectually fascinating, partly since it is a wonderful creation to Java's concurrency API, yet typically since it captures in an intensive and available manner professional wisdom on threading now not simply came across elsewhere."
--Bill Venners
Author of Inside the Java digital Machine
Threads are a basic a part of the Java platform. As multicore processors develop into the norm, utilizing concurrency successfully turns into crucial for construction high-performance functions. Java SE five and six are a big breakthrough for the advance of concurrent functions, with advancements to the Java digital desktop to aid high-performance, hugely scalable concurrent periods and a wealthy set of recent concurrency construction blocks. In Java Concurrency in Practice , the creators of those new amenities clarify not just how they paintings and the way to take advantage of them, but additionally the inducement and layout styles in the back of them.
However, constructing, checking out, and debugging multithreaded courses can nonetheless be very tricky; it's all too effortless to create concurrent courses that seem to paintings, yet fail whilst it concerns such a lot: in construction, lower than heavy load. Java Concurrency in Practice fingers readers with either the theoretical underpinnings and urban strategies for construction trustworthy, scalable, maintainable concurrent functions. instead of easily delivering a list of concurrency APIs and mechanisms, it offers layout ideas, styles, and psychological types that enable you to construct concurrent courses which are either right and performant.
This booklet covers:
• easy strategies of concurrency and thread security
• thoughts for construction and composing thread-safe periods
• utilizing the concurrency construction blocks in java.util.concurrent
• functionality optimization dos and don'ts
• checking out concurrent courses
• complex subject matters comparable to atomic variables, nonblocking algorithms, and the Java reminiscence Model
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Extra info for Java Concurrency in Practice
Example text
Let’s assume the worst and say it was the last possibility. Now it’s 12:15, you’ve both been to both Starbucks, and you’re both wondering if you’ve been stood up. What do you do now? Go back to the other Starbucks? How many times are you going to go back 3. 1). 4. The term race condition is often confused with the related term data race, which arises when synchronization is not used to coordinate all access to a shared nonfinal field. You risk a data race whenever a thread writes a variable that might next be read by another thread or reads a variable that might have last been written by another thread if both threads do not use synchronization; code with data races has no useful defined semantics under the Java Memory Model.
A program that omits needed synchronization might appear to work, passing its tests and performing well for years, but it is still broken and may fail at any moment. 15 16 Chapter 2. Thread Safety If multiple threads access the same mutable state variable without appropriate synchronization, your program is broken. There are three ways to fix it: • Don’t share the state variable across threads; • Make the state variable immutable; or • Use synchronization whenever accessing the state variable. If you haven’t considered concurrent access in your class design, some of these approaches can require significant design modifications, so fixing the problem might not be as trivial as this advice makes it sound.
Making an object thread-safe requires using synchronization to coordinate access to its mutable state; failing to do so could result in data corruption and other undesirable consequences. Whenever more than one thread accesses a given state variable, and one of them might write to it, they all must coordinate their access to it using synchronization. The primary mechanism for synchronization in Java is the synchronized keyword, which provides exclusive locking, but the term “synchronization” also includes the use of volatile variables, explicit locks, and atomic variables.