What is StampedLock in Java?

StampedLock is a synchronization aid that allows for a more scalable and flexible locking mechanism than traditional Java locks. It provides three types of locks: read locks, write locks, and optimistic read locks, which can help improve performance in multithreaded environments where read operations are more frequent than write operations.

StampedLock allows multiple threads to read shared data concurrently without blocking each other, while still providing a way to ensure exclusive access for write operations. This is achieved through the use of stamps, which are unique identifiers for the lock state, allowing threads to attempt to acquire locks in a way that reduces contention.

Here's an example of how to use StampedLock in Java:

StampedLock lock = new StampedLock(); // For a write lock long stamp = lock.writeLock(); try { // Perform write operation } finally { lock.unlockWrite(stamp); } // For a read lock long stamp = lock.readLock(); try { // Perform read operation } finally { lock.unlockRead(stamp); } // For an optimistic read lock long stamp = lock.tryOptimisticRead(); // Perform read operation if (!lock.validate(stamp)) { // The state has changed, need to lock stamp = lock.readLock(); try { // Perform read operation again } finally { lock.unlockRead(stamp); } }

StampedLock Java Concurrency Read Locks Write Locks Optimistic Read Locks Synchronization

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