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vaakansha
Inscrit le: 12 Juil 2024 Messages: 4
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Posté le: Mer Juil 17, 2024 1:22 pm Sujet du message: Concurrency in Java: Techniques and Best Practices |
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Concurrency in Java allows multiple threads to execute simultaneously, enhancing the performance of applications, especially on multi-core systems. To leverage concurrency effectively, developers must understand several key techniques and best practices.
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Techniques
Thread Class and Runnable Interface: Java provides the Thread class and Runnable interface for basic multithreading. The Thread class can be extended, or Runnable can be implemented to define the task to be executed by a thread.
Executor Framework: The ExecutorService in Java’s concurrency utilities simplifies thread management. The framework provides a pool of threads to execute tasks, improving resource management and performance.
Synchronization: The synchronized keyword ensures that only one thread can access a resource at a time, preventing data corruption. Alternatively, explicit locks, such as ReentrantLock, offer more flexible control over synchronization.
Concurrency Utilities: Java's java.util.concurrent package includes high-level utilities like CountDownLatch, CyclicBarrier, and Semaphore to coordinate multiple threads and control access to resources.
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Best Practices
Minimize Synchronization: Excessive synchronization can lead to contention and reduced performance. Use fine-grained locking and prefer using concurrent collections like ConcurrentHashMap over synchronized collections.
Thread Safety: Ensure shared data structures are thread-safe. Immutable objects and atomic variables (AtomicInteger, AtomicReference) are excellent choices for thread safety.
Avoid Busy Waiting: Use synchronization mechanisms like wait(), notify(), notifyAll(), or higher-level constructs to avoid CPU wastage through busy-wait loops.
Thread Pool Management: Use the Executors factory methods to create thread pools. Adjust pool sizes according to the application's workload and available system resources to avoid overloading the system.
By following these techniques and best practices, Java developers can write efficient, reliable, and maintainable concurrent applications.
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