jtulach@103: package org.apidesign.deadlock;
jtulach@103: 
jtulach@103: import org.junit.Test;
jtulach@103: import static org.junit.Assert.*;
jtulach@103: 
jtulach@103: public class SynchronizedFieldsInternallyTest {
jtulach@103:     public SynchronizedFieldsInternallyTest() {
jtulach@103:     }
jtulach@103: 
jtulach@103:     @Test
jtulach@103:     public void increment() {
jtulach@103:         SynchronizedFieldsInternally instance = new SynchronizedFieldsInternally();
jtulach@103:         instance.increment();
jtulach@103:     }
jtulach@103: 
jtulach@103:     @Test
jtulach@103:     public void unsafeDecrement() {
jtulach@103:         SynchronizedFieldsInternally instance = new SynchronizedFieldsInternally();
jtulach@103:         try {
jtulach@103:             instance.unsafeDecrement();
jtulach@103:         } catch (java.lang.AssertionError ex) {
jtulach@103:             // OK
jtulach@103:             return;
jtulach@103:         }
jtulach@103:         fail("This will fail as unsafeDecrement is not synchronized, and that" +
jtulach@103:             "is why it cannot access the field using getter and setter"
jtulach@103:         );
jtulach@103:     }
jtulach@103: 
jtulach@103:     @Test
jtulach@103:     public void fixUnsafeDecrementFromOutside() {
jtulach@103:         SynchronizedFieldsInternally instance = new SynchronizedFieldsInternally();
jtulach@103:         try {
jtulach@103:             synchronized (instance) {
jtulach@103:                 instance.unsafeDecrement();
jtulach@103:             }
jtulach@103:         } catch (AssertionError ex) {
jtulach@103:             // OK
jtulach@103:             return;
jtulach@103:         }
jtulach@103:         fail("Unlike the SynchronizedFieldsTest, the fix by wrapping instance" +
jtulach@103:             "into own synchronized block will not help, neither any other" +
jtulach@103:             "fix, the lock is really private"
jtulach@103:         );
jtulach@103:     }
jtulach@103: }