package api;

import org.junit.After;

import org.junit.AfterClass;

import org.junit.Before;

import org.junit.BeforeClass;

import org.junit.Test;

import static org.junit.Assert.*;

public class MutexTest {

    // BEGIN: mutex.init

    private static final Mutex.Privileged PRIVILEGED = new Mutex.Privileged();

    public static final Mutex MUTEX = new Mutex(PRIVILEGED);

    // END: mutex.init

    public MutexTest() {

    }

    @BeforeClass

    public static void setUpClass() throws Exception {

    }

    @AfterClass

    public static void tearDownClass() throws Exception {

    }

    @Before

    public void setUp() {

    }

    @After

    public void tearDown() {

    }

    /**

     * Test of readAccess method, of class Mutex.

     */

    @Test

    public void readAccess() {

        class R implements Runnable {

            int cnt;

            public void run() {

                cnt++;

            }

        }

        R r = new R();

        Mutex instance = new Mutex();

        instance.readAccess(r);

        assertEquals("One call to runnable", 1, r.cnt);

    }

    @Test

    public void usePrivileged() {

        Mutex.Privileged lock = new Mutex.Privileged();

        Mutex mutex = new Mutex(lock);

        // BEGIN: mutex.privileged

        lock.enterReadAccess();

        try {

          // do the operation

        } finally {

           lock.exitReadAccess();

        }

        // END: mutex.privileged

    }

}