package api;

 import org.apidesign.privileged.api.Mutex;

 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() {

         Mutex instance = new Mutex();

         // BEGIN: mutex.use

         class R implements Runnable {

             int cnt;

             public void run() {

                 cnt++;

             }

         }

         R r = new R();

         instance.readAccess(r);

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

         // END: mutex.use

     }

     @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

     }

 }