public void Run()
{
int count = AtLeast(Rnd, 10000);
for (int i = 0; i < count; i++)
{
int j = Rnd.Next(KeyCount);
switch (Rnd.Next(5))
{
case 0:
Map.Put(Keys.Get(j), Convert.ToInt32(j));
break;
case 1:
int?v = Map.Get(Keys.Get(j));
if (v != null)
{
Assert.AreEqual(j, (int)v);
}
break;
case 2:
Map.Remove(Keys.Get(j));
break;
case 3:
// renew key, the old one will be GCed at some time:
Keys.Set(j, new object());
break;
case 4:
// check iterator still working
for (IEnumerator <object> it = Map.Keys.GetEnumerator(); it.MoveNext();)
{
Assert.IsNotNull(it.Current);
}
break;
default:
Assert.Fail("Should not get here.");
break;
}
}
}
public virtual void TestConcurrentHashMap()
{
// don't make threadCount and keyCount random, otherwise easily OOMs or fails otherwise:
const int threadCount = 8, keyCount = 1024;
ExecutorService exec = Executors.newFixedThreadPool(threadCount, new NamedThreadFactory("testConcurrentHashMap"));
WeakIdentityMap <object, int?> map = WeakIdentityMap <object, int?> .NewConcurrentHashMap(Random().NextBoolean());
// we keep strong references to the keys,
// so WeakIdentityMap will not forget about them:
AtomicReferenceArray <object> keys = new AtomicReferenceArray <object>(keyCount);
for (int j = 0; j < keyCount; j++)
{
keys.Set(j, new object());
}
try
{
for (int t = 0; t < threadCount; t++)
{
Random rnd = new Random(Random().Next());
exec.execute(new RunnableAnonymousInnerClassHelper(this, keyCount, map, keys, rnd));
}
}
finally
{
exec.shutdown();
while (!exec.awaitTermination(1000L, TimeUnit.MILLISECONDS))
{
;
}
}
// clear strong refs
for (int j = 0; j < keyCount; j++)
{
keys.Set(j, null);
}
// check that GC does not cause problems in reap() method:
int size = map.Size();
for (int i = 0; size > 0 && i < 10; i++)
{
try
{
System.runFinalization();
System.gc();
int newSize = map.Size();
Assert.IsTrue(size >= newSize, "previousSize(" + size + ")>=newSize(" + newSize + ")");
size = newSize;
Thread.Sleep(new TimeSpan(100L));
int c = 0;
for (IEnumerator <object> it = map.Keys.GetEnumerator(); it.MoveNext();)
{
Assert.IsNotNull(it.Current);
c++;
}
newSize = map.Size();
Assert.IsTrue(size >= c, "previousSize(" + size + ")>=iteratorSize(" + c + ")");
Assert.IsTrue(c >= newSize, "iteratorSize(" + c + ")>=newSize(" + newSize + ")");
size = newSize;
}
catch (ThreadInterruptedException ie)
{
}
}
}
public virtual void TestConcurrentHashMap()
{
// don't make threadCount and keyCount random, otherwise easily OOMs or fails otherwise:
const int threadCount = 8, keyCount = 1024;
ExecutorService exec = Executors.newFixedThreadPool(threadCount, new NamedThreadFactory("testConcurrentHashMap"));
WeakIdentityMap<object, int?> map = WeakIdentityMap<object, int?>.NewConcurrentHashMap(Random().NextBoolean());
// we keep strong references to the keys,
// so WeakIdentityMap will not forget about them:
AtomicReferenceArray<object> keys = new AtomicReferenceArray<object>(keyCount);
for (int j = 0; j < keyCount; j++)
{
keys.Set(j, new object());
}
try
{
for (int t = 0; t < threadCount; t++)
{
Random rnd = new Random(Random().Next());
exec.execute(new RunnableAnonymousInnerClassHelper(this, keyCount, map, keys, rnd));
}
}
finally
{
exec.shutdown();
while (!exec.awaitTermination(1000L, TimeUnit.MILLISECONDS)) ;
}
// clear strong refs
for (int j = 0; j < keyCount; j++)
{
keys.Set(j, null);
}
// check that GC does not cause problems in reap() method:
int size = map.Size();
for (int i = 0; size > 0 && i < 10; i++)
{
try
{
System.runFinalization();
System.gc();
int newSize = map.Size();
Assert.IsTrue(size >= newSize, "previousSize(" + size + ")>=newSize(" + newSize + ")");
size = newSize;
Thread.Sleep(new TimeSpan(100L));
int c = 0;
for (IEnumerator<object> it = map.Keys.GetEnumerator(); it.MoveNext(); )
{
Assert.IsNotNull(it.Current);
c++;
}
newSize = map.Size();
Assert.IsTrue(size >= c, "previousSize(" + size + ")>=iteratorSize(" + c + ")");
Assert.IsTrue(c >= newSize, "iteratorSize(" + c + ")>=newSize(" + newSize + ")");
size = newSize;
}
catch (ThreadInterruptedException ie)
{
}
}
}
