Java高性能线程库：Jetlang

Jetlang 提供了一个高性能的Java线程库，该库是 JDK 1.5 中的 java.util.concurrent 包的补充，可用于基于并发消息机制的应用。该类库不提供远程的消息功能，其设计的宗旨是实现一个内存中的消息传递机制：

主要特点有：

• All messages to a particular Fiber are delivered sequentially. Components can easily keep state without synchronizing data access or worrying about thread races.
• Single Fiber interface that can be backed by a dedicated thread or a thread pool.
• Supports single or multiple subscribers for messages.
• Subscriptions for single events or event batching
• Single or recurring event scheduling
• High performance design optimized for low latency and high scalability
• Publishing is thread safe, allowing easy integration with other threading models.
• Low Lock Contention – Minimizing lock contention is critical for performance. Other concurrency solutions are limited by a single lock typically on a central thread pool or message queue. Jetlang is optimized for low lock contention. Without a central bottleneck, performance easily scales to the needs of the application.

Fiber fiber = 
new
ThreadFiber();

fiber.start();

final CountDownLatch latch = 
new
CountDownLatch(2);

Runnable toRun = 
new
Runnable(){

   
public
void
run(){

      
latch.countDown();

   
}

};

//enqueue runnable for execution

fiber.execute(toRun);

//repeat to trigger latch a 2nd time

fiber.execute(toRun);

latch.await(10, TimeUnit.SECONDS);

//shutdown thread

fiber.dispose();

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