package org.apidesign.samples;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 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 StringBufferTest {

     @Test

     public void createRegular() {

         StringBuffer sb = new StringBuffer();

         assertAddAndToString(sb);

     }

     @Test

     public void createUnsynchronized() throws InterruptedException {

         final StringBuffer sb = StringBuffer.createUnsynchronized();

         class Lock extends Thread {

             int state;

             @Override

             public void run() {

                 synchronized (sb) {

                     try {

                         state = 1;

                         sb.notifyAll();

                         sb.wait();

                         state = 2;

                     } catch (InterruptedException ex) {

                         Logger.getLogger(StringBufferTest.class.getName()).log(Level.SEVERE, null, ex);

                     }

                 }

             }

             public void waitLocked() throws InterruptedException {

                 synchronized (sb) {

                     for (;;) {

                         if (state == 1) {

                             return;

                         }

                         sb.wait();

                     }

                 }

             }

         }

         Lock lock = new Lock();

         lock.start();

         lock.waitLocked();

         assertEquals("result is really locked", 1, lock.state);

         assertAddAndToString(sb);

         assertEquals("result is still locked", 1, lock.state);

     }

     private void assertAddAndToString(StringBuffer sb) {

         sb.append("Hello").append(" ");

         sb.append("API").append(" Design!");

         assertEquals("Hello API Design!", sb.toString());

     }

 }