BlockQueue

 

import java.util.*;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;


public class BlockQueue<T> {
	public int capacity;
	public Queue<T> queue;
	final Lock lock = new ReentrantLock();
	final Condition notFull = lock.newCondition();
	final Condition notEmpty = lock.newCondition();
	
	public BlockQueue(int limit) {
		this.capacity = limit;
		this.queue = new LinkedList<>();
	}
	
	public void put(T data) throws InterruptedException {
		lock.lock();
		try {
			while (queue.size() == capacity) {
				notFull.await();
			}
			queue.offer(data);
			notEmpty.signal();
		} finally {
			lock.unlock();
		}
	}
	
	public T get() throws InterruptedException {
		lock.lock();
		try {
			while (queue.size() == 0) {
				notEmpty.await();
			}
			T data = queue.poll();
			notFull.signal();
			return data;
		} finally {
			lock.unlock();
		}
	}
	
	public static void main(String[] args) {

		
	}
	
	
}