package ua.nure.rozdaybeda.Practice5.part3;

import java.util.ArrayList;

/**
 * Task 3
 * @author Oleg
 *
 */
public class Part3 {

	/**
	 * Demonstrates work of class
	 * @param args Command line arguments
	 */
	public static void main(String[] args) {
		ArrayList<Thread> threads = new ArrayList<Thread>();
		Counter counter = new Counter();

		for(int a = 0; a < 10; a++) {
			Thread current;
			threads.add(current = new Thread(() ->
				{
					for(int i = 0;i < 10; i++)
						counter.notSyncAccess();
				}
			));
			current.start();
		}
		for(Thread t: threads) {
			try {
				t.join();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		threads.clear();

//		System.out.println("NEXT################################################");
//
//		for(int a = 0; a < 10; a++) {
//			Thread current;
//			threads.add(current = new Thread(() ->
//				{
//					for(int i = 0;i < 10; i++)
//						counter.syncAccess();
//				}
//			));
//			current.start();
//		}
//		for(Thread t: threads) {
//			try {
//				t.join();
//			} catch (InterruptedException e) {
//				e.printStackTrace();
//			}
//		}
//		threads.clear();

		System.out.println("c1 " + counter.c1 + " c2 " + counter.c2);
	}
}

package ua.nure.rozdaybeda.Practice5.part3;

/**
 * Encapsulates two counters and provides synchronized and non-synchronized access
 * @author Oleg
 *
 */
public class Counter{
	/**
	 * Counter 1
	 */
	volatile int c1 = 0;
	/**
	 * Counter 2
	 */
	volatile int c2 = 0;

	/**Compares counters and prints result then increments first counter and waits 10 milliseconds. Finally, increments secont counter.
	 */
	public void compareAndChange() {
//		System.out.println(c1 == c2 ? "equals" : "not
		c1 += 1;
		try {
			Thread.sleep(10);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		c2 += 1;
	}

	/**
	 * Provides synchronized access to {@link #compareAndChange compareAndChange} method
	 */
	public synchronized void syncAccess(){
		compareAndChange();
	}
	/**
	 * Provides non-synchronized access to {@link #compareAndChange compareAndChanged} method
	 */
	public void notSyncAccess() {
		compareAndChange();
	}
}