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());

    }

}