34 lines
901 B
Java
34 lines
901 B
Java
class QueueFullException extends RuntimeException {}
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class QueueEmptyException extends RuntimeException {}
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class ThreadSafeQueue<T> {
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private final Object lock = new Object();
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private final T[] queue;
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private int size = 0;
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private int front = 0;
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private int rear = 0;
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@SuppressWarnings("unchecked")
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public ThreadSafeQueue() {
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queue = (T[]) new Object[10];
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}
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public void enqueue(T item) {
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synchronized (lock) {
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if (size >= 10) throw new QueueFullException();
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queue[rear] = item;
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rear = (rear + 1) % queue.length;
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size++;
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}
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}
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public T dequeue() {
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synchronized (lock) {
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if (size == 0) throw new QueueEmptyException();
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T item = queue[front];
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front = (front + 1) % queue.length;
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size--;
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return item;
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}
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}
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}
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