Concurrent Programming in Java™: Design Principles and by Doug Lea

By Doug Lea

* one among Java's strongest features is its integrated aid for concurrent programming, a layout strategy within which a number of concurrent activities-threads ensue inside of a unmarried Java software. Thread programming permits builders to layout purposes which are extra conscious of consumer calls for, swifter, and extra simply managed. * This e-book deals accomplished insurance of this important point of the Java language. The booklet is totally up to date with the recent thread version that's now integrated into the latest model of the Java digital desktop. All Java programmers drawn to doing concurrent programming needs to comprehend those new innovations. The e-book techniques the subject from a layout development standpoint. It introduces and summarizes Java's concurrency aid, exhibits readers find out how to begin, regulate, and coordinate concurrent actions, and gives quite a few recipe-like ideas for designing and enforcing Java buildings that resolve universal concurrent programming demanding situations. particularly, the e-book provides vital techniques for heading off the inconsistencies that may crop up in multi-threaded courses, addresses the concept that of "liveness"-how to make sure that all threads in use are stored lively at the same time, examines state-dependent motion, and demonstrates powerful equipment for dealing with consumer requests in a multi-threaded surroundings.

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By Doug Lea

* one among Java's strongest features is its integrated aid for concurrent programming, a layout strategy within which a number of concurrent activities-threads ensue inside of a unmarried Java software. Thread programming permits builders to layout purposes which are extra conscious of consumer calls for, swifter, and extra simply managed. * This e-book deals accomplished insurance of this important point of the Java language. The booklet is totally up to date with the recent thread version that's now integrated into the latest model of the Java digital desktop. All Java programmers drawn to doing concurrent programming needs to comprehend those new innovations. The e-book techniques the subject from a layout development standpoint. It introduces and summarizes Java's concurrency aid, exhibits readers find out how to begin, regulate, and coordinate concurrent actions, and gives quite a few recipe-like ideas for designing and enforcing Java buildings that resolve universal concurrent programming demanding situations. particularly, the e-book provides vital techniques for heading off the inconsistencies that may crop up in multi-threaded courses, addresses the concept that of "liveness"-how to make sure that all threads in use are stored lively at the same time, examines state-dependent motion, and demonstrates powerful equipment for dealing with consumer requests in a multi-threaded surroundings.

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Somewhat less flexibly, these methods need not be declared non-public if they are instead designed to be overridden in subclasses. • Before and after operations are also defined as non-public methods. • Public methods invoke the ground methods between the before and after methods. Applying this to the Tank example leads to: abstract class AbstractTank implements Tank { protected void checkVolumeInvariant() throws AssertionError { // ... identical to AdaptedTank version ... } protected abstract void doTransferWater(float amount) throws OverflowException, UnderflowException; public synchronized void transferWater(float amount) 48 49 throws OverflowException, UnderflowException { // identical to AdaptedTank version except for inner call: // ...

The remainder of this section looks more closely at safety, liveness, performance, and reusability in concurrent programs. It presents basic terms and definitions, along with brief introductions to core issues and tactics that are revisited and amplified throughout the course of this book. 1 Safety Safe concurrent programming practices are generalizations of safe and secure sequential programming practices. Safety in concurrent designs adds a temporal dimension to common notions of type safety.

3). Any attempts to ensure safety must take these relationships into account. For example: • A Stack might have a headOfLinkedList field recording the first node of a list representing the stack. URL object. • The balance of a BankAccount might be maintained in a central repository, in which case the BankAccount would instead maintain a a field referring to the repository (in order to ask it about the current balance). In this case, some of the logical state of the BankAccount is actually managed by the repository.

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