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package servlet.test;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class ReadWriteLockTest {
	private Map<String, Object> map = new HashMap<>();
	private ReadWriteLock lock = new ReentrantReadWriteLock(false);
	private Lock rlock = lock.readLock();
	private Lock wlock = lock.writeLock();

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		final ReadWriteLockTest readWriteLockTest = new ReadWriteLockTest();
		new Thread(){
			@Override
			public void run() {
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				// TODO Auto-generated method stub
				readWriteLockTest.put("abc", "abc");
			}
		}.start();
		
		new Thread(){
			@Override
			public void run() {
				try {
					Thread.sleep(500);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				// TODO Auto-generated method stub
				System.out.println(readWriteLockTest.get("abc"));
			}
		}.start();
		
		
	}

	public Object get(String key) {
		rlock.lock();
		try {
			return map.get(key);
		} finally {
			rlock.unlock();
		}
	}

	public Object put(String key, Object value) {
		wlock.lock();
		try {
			return map.put(key, value);
		} finally {
			wlock.unlock();
		}
	}

}