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Refactor volatile (#2444)

This commit is contained in:
Grzegorz Piwowarek 2017-08-15 15:17:24 +02:00 committed by GitHub
parent 3b5d9585ed
commit 6db067d2c9
2 changed files with 28 additions and 56 deletions
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2
core-java/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
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@ -4,7 +4,7 @@ package com.baeldung.concurrent.volatilekeyword;
public class SharedObject {
private volatile int count=0;
public void increamentCount(){
void increamentCount(){
count++;
}
public int getCount(){

82
core-java/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
View File

@ -8,92 +8,64 @@ import static junit.framework.Assert.assertEquals;
public class SharedObjectManualTest {
SharedObject sharedObject;
int valueReadByThread2;
int valueReadByThread3;
private SharedObject sharedObject;
private int valueReadByThread2;
private int valueReadByThread3;
@Before
public void setUp(){
public void setUp() {
sharedObject = new SharedObject();
}
@Test
public void whenOneThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
Thread writer = new Thread(){
public void run(){
sharedObject.increamentCount();
}
};
Thread writer = new Thread(() -> sharedObject.increamentCount());
writer.start();
Thread readerOne = new Thread(){
public void run(){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
valueReadByThread2= sharedObject.getCount();
Thread readerOne = new Thread(() -> {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
};
valueReadByThread2 = sharedObject.getCount();
});
readerOne.start();
Thread readerTwo = new Thread(){
public void run(){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
valueReadByThread3=sharedObject.getCount();
Thread readerTwo = new Thread(() -> {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
};
valueReadByThread3 = sharedObject.getCount();
});
readerTwo.start();
assertEquals(1,valueReadByThread2);
assertEquals(1,valueReadByThread3);
assertEquals(1, valueReadByThread2);
assertEquals(1, valueReadByThread3);
}
@Test
public void whenTwoThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
Thread writerOne = new Thread(){
public void run(){
sharedObject.increamentCount();
}
};
Thread writerOne = new Thread(() -> sharedObject.increamentCount());
writerOne.start();
Thread.sleep(100);
Thread writerTwo = new Thread(){
public void run(){
sharedObject.increamentCount();
}
};
Thread writerTwo = new Thread(() -> sharedObject.increamentCount());
writerTwo.start();
Thread.sleep(100);
Thread readerOne = new Thread(){
public void run(){
valueReadByThread2= sharedObject.getCount();
}
};
Thread readerOne = new Thread(() -> valueReadByThread2 = sharedObject.getCount());
readerOne.start();
Thread readerTwo = new Thread(){
public void run(){
valueReadByThread3=sharedObject.getCount();
}
};
Thread readerTwo = new Thread(() -> valueReadByThread3 = sharedObject.getCount());
readerTwo.start();
assertEquals(2,valueReadByThread2);
assertEquals(2,valueReadByThread3);
assertEquals(2, valueReadByThread2);
assertEquals(2, valueReadByThread3);
}
@After
public void cleanup(){
sharedObject = null;
}
}