public void QueueCacheMissTest()
{
var bufferPool = new TestBlockPool();
var dataAdapter = new TestCacheDataAdapter(bufferPool);
var cache = new PooledQueueCache <TestQueueMessage, TestCachedMessage>(dataAdapter, TestCacheDataComparer.Instance);
dataAdapter.PurgeAction = cache.Purge;
int sequenceNumber = 10;
IBatchContainer batch;
IStreamIdentity streamId = new TestStreamIdentity {
Guid = Guid.NewGuid(), Namespace = StreamNamespace
};
// No data in cache, cursors should not throw.
object cursor = cache.GetCursor(streamId, new EventSequenceToken(sequenceNumber++));
Assert.IsNotNull(cursor);
// try to iterate, should throw
bool gotNext = cache.TryGetNextMessage(cursor, out batch);
Assert.IsNotNull(cursor);
Assert.IsFalse(gotNext);
// now add messages into cache newer than cursor
// Adding enough to fill the pool
for (int i = 0; i < MessagesPerBuffer * PooledBufferCount; i++)
{
cache.Add(new TestQueueMessage
{
StreamGuid = streamId.Guid,
StreamNamespace = StreamNamespace,
SequenceNumber = sequenceNumber++,
});
}
// now that there is data, and the cursor should point to data older than in the cache, using cursor should throw
Exception ex = null;
try
{
cache.TryGetNextMessage(cursor, out batch);
}
catch (QueueCacheMissException cacheMissException)
{
ex = cacheMissException;
}
Assert.IsNotNull(ex);
// Try getting new cursor into cache from data before the cache. Should throw
ex = null;
try
{
cursor = cache.GetCursor(streamId, new EventSequenceToken(10));
}
catch (QueueCacheMissException cacheMissException)
{
ex = cacheMissException;
}
Assert.IsNotNull(ex);
// Get valid cursor into cache
cursor = cache.GetCursor(streamId, new EventSequenceToken(13));
// query once, to make sure cursor is good
gotNext = cache.TryGetNextMessage(cursor, out batch);
Assert.IsNotNull(cursor);
Assert.IsTrue(gotNext);
// Since pool should be full, adding one more message should trigger the cache to purge.
cache.Add(new TestQueueMessage
{
StreamGuid = streamId.Guid,
StreamNamespace = StreamNamespace,
SequenceNumber = sequenceNumber++,
});
// After purge, use of cursor should throw.
ex = null;
try
{
cache.TryGetNextMessage(cursor, out batch);
}
catch (QueueCacheMissException cacheMissException)
{
ex = cacheMissException;
}
Assert.IsNotNull(ex);
}
private int RunGoldenPath(PooledQueueCache <TestQueueMessage, TestCachedMessage> cache, int startOfCache)
{
int sequenceNumber = startOfCache;
IBatchContainer batch;
IStreamIdentity stream1 = new TestStreamIdentity {
Guid = Guid.NewGuid(), Namespace = StreamNamespace
};
IStreamIdentity stream2 = new TestStreamIdentity {
Guid = Guid.NewGuid(), Namespace = StreamNamespace
};
// now add messages into cache newer than cursor
// Adding enough to fill the pool
for (int i = 0; i < MessagesPerBuffer * PooledBufferCount; i++)
{
cache.Add(new TestQueueMessage
{
StreamGuid = i % 2 == 0 ? stream1.Guid : stream2.Guid,
StreamNamespace = StreamNamespace,
SequenceNumber = sequenceNumber++,
});
}
// get cursor for stream1, walk all the events in the stream using the cursor
object stream1Cursor = cache.GetCursor(stream1, new EventSequenceToken(startOfCache));
int stream1EventCount = 0;
while (cache.TryGetNextMessage(stream1Cursor, out batch))
{
Assert.IsNotNull(stream1Cursor);
Assert.IsNotNull(batch);
Assert.AreEqual(stream1.Guid, batch.StreamGuid);
Assert.AreEqual(StreamNamespace, batch.StreamNamespace);
Assert.IsNotNull(batch.SequenceToken);
stream1EventCount++;
}
Assert.AreEqual((sequenceNumber - startOfCache) / 2, stream1EventCount);
// get cursor for stream2, walk all the events in the stream using the cursor
object stream2Cursor = cache.GetCursor(stream2, new EventSequenceToken(startOfCache));
int stream2EventCount = 0;
while (cache.TryGetNextMessage(stream2Cursor, out batch))
{
Assert.IsNotNull(stream2Cursor);
Assert.IsNotNull(batch);
Assert.AreEqual(stream2.Guid, batch.StreamGuid);
Assert.AreEqual(StreamNamespace, batch.StreamNamespace);
Assert.IsNotNull(batch.SequenceToken);
stream2EventCount++;
}
Assert.AreEqual((sequenceNumber - startOfCache) / 2, stream2EventCount);
// Add a blocks worth of events to the cache, then walk each cursor. Do this enough times to fill the cache twice.
for (int j = 0; j < PooledBufferCount * 2; j++)
{
for (int i = 0; i < MessagesPerBuffer; i++)
{
cache.Add(new TestQueueMessage
{
StreamGuid = i % 2 == 0 ? stream1.Guid : stream2.Guid,
StreamNamespace = StreamNamespace,
SequenceNumber = sequenceNumber++,
});
}
// walk all the events in the stream using the cursor
while (cache.TryGetNextMessage(stream1Cursor, out batch))
{
Assert.IsNotNull(stream1Cursor);
Assert.IsNotNull(batch);
Assert.AreEqual(stream1.Guid, batch.StreamGuid);
Assert.AreEqual(StreamNamespace, batch.StreamNamespace);
Assert.IsNotNull(batch.SequenceToken);
stream1EventCount++;
}
Assert.AreEqual((sequenceNumber - startOfCache) / 2, stream1EventCount);
// walk all the events in the stream using the cursor
while (cache.TryGetNextMessage(stream2Cursor, out batch))
{
Assert.IsNotNull(stream2Cursor);
Assert.IsNotNull(batch);
Assert.AreEqual(stream2.Guid, batch.StreamGuid);
Assert.AreEqual(StreamNamespace, batch.StreamNamespace);
Assert.IsNotNull(batch.SequenceToken);
stream2EventCount++;
}
Assert.AreEqual((sequenceNumber - startOfCache) / 2, stream2EventCount);
}
return(sequenceNumber);
}
