Java高性能線程庫：Jetlang

Jetlang 提供了一個高性能的Java線程庫，該庫是 JDK 1.5 中的 java.util.concurrent 包的補充，可用于基于并發消息機制的應用。該類庫不提供遠程的消息功能，其設計的宗旨是實現一個內存中的消息傳遞機制：

主要特點有：

• 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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