Javax Enterprise Concurrent API framework interpretation

Javax Enterprise Concurrent API framework interpretation Java Enterprise Concurrency API (Java Enterprise Paimori API) provides a set of powerful tools and mechanisms to process concurrent programming to support multi -threaded and concurrent tasks in Java enterprise applications.This article will explore the concurrent mechanism of Javax Enterprise Concurrent API framework and how to use them to achieve efficient concurrent programming. 1. thread pool (Executor) The thread pool is an important concept of management thread.It allows you to reuse threads in the application, thereby reducing the overhead of thread creation and destruction.The Javax Enterprise Concurrent API provides an scalable thread pool framework that can create and manage the thread pool by using the Executorservice and Executors classes.The following is a simple example: ExecutorService executor = Executors.newFixedThreadPool(10); executor.submit(() -> { // Execute concurrent tasks }); executor.shutdown(); The above code creates a thread pool with a fixed size of 10 and submits a concurrent task for execution.Using a thread pool can better control the number of threads in high -parallel scenes, and reasonably manage thread resources. 2. Callable and Future Java Enterprise Concurrency API is supported by the execution and results of the execution and results supporting concurrent tasks through the Callable and Future interface.Callable is a concurrent task with a return result, while Future means the result of asynchronous computing.You can submit the call task to the thread pool through the ExecutorService.submit () method, and return a Future object that indicates the result of the task.Below is an example: ExecutorService executor = Executors.newFixedThreadPool(10); Future<String> future = executor.submit(() -> { // Execute the concurrent task, return the result Return "task execution result"; }); String result = future.get (); // Oblock waiting for the task to execute and get the result executor.shutdown(); In the above code, a Callace task is submitted to the thread pool through the submit () method, and a Future object that represents the result of the task is obtained.Then, you can obtain the execution results of the task through the Future.get () method. 3. Concurrent collection Javax Enterprise Concurrent API provides some concurrent sets to handle data sharing and synchronization during multi -threaded concurrent operations.These concurrent sets have the characteristics of thread security and can perform data operations efficiently in multi -threaded environments.For example, ConcurrenThashMap is a well -issued security hash table, and ConcurrentLINKEDQueue is a secure queue.Below is a simple example of using ConcurrenThashMap: ConcurrentMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("key1", 1); map.put("key2", 2); int value = map.get ("key1"); // Get the value map.remove ("key2"); // Remove the key value pair In the above code, the ConcurrenThashMap is used to store key value pairs, and adds a new key value pair through the PUT () method. To obtain the corresponding value through the get () method, remove the specified key value pair through the Remove () method.ConcurrenThashMap can efficiently handle the concurrent concurrency operation under the security of threads. 4. Paled lock (lock) Java Enterprise Concurrency API also provides some LOCK interfaces and implementation classes for multi -threaded synchronization.LOCK provides a more flexible and scalable way than Synchronized keywords to control the visits of shared resources.The commonly used LOCK implementation classes include ReentrantLock and ReadWriteLock.Below is a simple example of using ReentrantLock: Lock lock = new ReentrantLock(); lock.lock (); // Get the lock try { // Execute concurrent operation } finally { lock.unlock (); // Release the lock } In the above code, obtain the lock through the lock () method, and use the Try-Finally structure to ensure that the lock can be released after the lock is used.LOCK allows more flexibly to control the access to shared resources and supports the enrollment characteristics. In summary, the Javax Enterprise Concurrent API framework provides a powerful concurrent mechanism, including thread pools, concurrent tasks, concurrent collection and concurrent locks.By using these mechanisms reasonably, you can handle multi -threaded and concurrent programming more efficiently and safely.