Auto Close Resources: A Lock Wrapper in Java that Allows AutoCloseable (Try-With-Resources)

We can use the following Java Wrapper for Lock so that we can Try-With-Resources to Auto Close the Lock:

public final class ALock implements AutoCloseable {
    private final Lock lock;

    public ALock(Lock l) {
        this.lock = l;
    }

    public final ALock lock() {
        this.lock.lock();
        return this;
    }

    public final void close() {
        this.lock.unlock();
    }
}

For example, we can do this:

package helloacm.com

public class LockWrapperTesting {
    public static void main(String[] args) {
        var value = 1.0;
        var lock = new ReentrantLock();
        var wLock = new ALock(lock);
        try (var l = wLock.lock()) {
            value ++;
            System.out.println("Hello " + value);
        }
    }
}

This Java code prints “Hello 2.0” to the console. We use a ReentrantLock to enter the critical code block where we increment the value.

The Lock will be automatically unlocked after the try {} block.

–EOF (The Ultimate Computing & Technology Blog) —