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AQS in Java.util.concurrent Synchronizer Classes

Summary

If you need to implement a state-dependent classone whose methods must block if a state-based precondition does not holdthe best strategy is usually to build upon an existing library class such as Semaphore, BlockingQueue, or CountDownLatch, as in ValueLatch on page 187. However, sometimes existing library classes do not provide a sufficient foundation; in these cases, you can build your own synchronizers using intrinsic condition queues, explicit Condition objects, or AbstractQueuedSynchronizer. Intrinsic condition queues are tightly bound to intrinsic locking, since the mechanism for managing state dependence is necessarily tied to the mechanism for ensuring state consistency. Similarly, explicit Conditions are tightly bound to explicit Locks, and offer an extended feature set compared to intrinsic condition queues, including multiple wait sets per lock, interruptible or uninterruptible condition waits, fair or nonfair queuing, and deadline-based waiting.


Introduction

Part I: Fundamentals

Thread Safety

Sharing Objects

Composing Objects

Building Blocks

Part II: Structuring Concurrent Applications

Task Execution

Cancellation and Shutdown

Applying Thread Pools

GUI Applications

Part III: Liveness, Performance, and Testing

Avoiding Liveness Hazards

Performance and Scalability

Testing Concurrent Programs

Part IV: Advanced Topics

Explicit Locks

Building Custom Synchronizers

Atomic Variables and Nonblocking Synchronization

The Java Memory Model





Java Concurrency in Practice
Java Concurrency in Practice
ISBN: 0321349601
EAN: 2147483647
Year: 2004
Pages: 141
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