public void VerifyCallbackWrappersCollectsUnusedWrappers()
{
DateTime endTime = DateTime.Now + TimeSpan.FromSeconds(19);
var callbackWrappers = new CallbackWrappers();
RunFullGarbageCollection();
long memoryAtStart = EseInteropTestHelper.GCGetTotalMemory(true);
while (DateTime.Now < endTime)
{
for (int i = 0; i < 128; ++i)
{
CreateCallbackWrapper(callbackWrappers);
}
RunFullGarbageCollection();
callbackWrappers.Collect();
RunFullGarbageCollection();
}
RunFullGarbageCollection();
long memoryAtEnd = EseInteropTestHelper.GCGetTotalMemory(true);
GC.KeepAlive(callbackWrappers);
long memory = memoryAtEnd - memoryAtStart;
EseInteropTestHelper.ConsoleWriteLine("{0:N0} bytes used", memory);
Assert.IsTrue(memory < 1024 * 1024, "Test used too much memory. JetCallbackWrapper objects weren't collected.");
}
/// <summary>
/// Perform an action, checking the system's memory usage before and after.
/// </summary>
/// <param name="action">The action to perform.</param>
private static void CheckMemoryUsage(Action action)
{
RunGarbageCollection();
long memoryAtStart = EseInteropTestHelper.GCGetTotalMemory(true);
int collectionCountAtStart = EseInteropTestHelper.GCCollectionCount(0);
action();
int collectionCountAtEnd = EseInteropTestHelper.GCCollectionCount(0);
RunGarbageCollection();
long memoryAtEnd = EseInteropTestHelper.GCGetTotalMemory(true);
EseInteropTestHelper.ConsoleWriteLine(
"Memory changed by {0:N} bytes ({1} GC cycles)",
memoryAtEnd - memoryAtStart,
collectionCountAtEnd - collectionCountAtStart);
}