/// <summary>
/// Try to add a value to the map.
/// </summary>
internal T Add(string key, T value)
{
while (true)
{
var newEntry = new SoftReference <T>(value);
var entry = map.PutIfAbsent(key, newEntry);
if (entry != null)
{
// There was an entry in the map.
var result = entry.Get();
if (result != null)
{
// The entry holds a valid reference, we're done
return(result);
}
else
{
// The entry has been cleared
map.Replace(key, newEntry);
}
}
}
}
public void TestReplaceValue3_NullReferenceException()
{
try
{
ConcurrentHashMap<Object, Object> c = new ConcurrentHashMap<Object, Object>(5);
c.Replace("whatever", one, null);
ShouldThrow();
}
catch(NullReferenceException)
{
}
}