public void SimpleCacheMiss()
{
var bufferPool = new ObjectPool <FixedSizeBuffer>(() => new FixedSizeBuffer(PooledBufferSize));
var dataAdapter = new TestCacheDataAdapter();
var cache = new PooledQueueCache(dataAdapter, NullLogger.Instance, null, null, TimeSpan.FromSeconds(10));
var evictionStrategy = new ChronologicalEvictionStrategy(NullLogger.Instance, new TimePurgePredicate(TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1)), null, null);
evictionStrategy.PurgeObservable = cache;
var converter = new CachedMessageConverter(bufferPool, evictionStrategy);
var seqNumber = 123;
var streamKey = Guid.NewGuid();
var stream = StreamId.Create(TestStreamNamespace, streamKey);
var cursor = cache.GetCursor(stream, new EventSequenceTokenV2(seqNumber));
// Start by enqueuing a message for stream, followed bu another one destined for another one
EnqueueMessage(streamKey);
EnqueueMessage(Guid.NewGuid());
// Consume the stream, should be fine
Assert.True(cache.TryGetNextMessage(cursor, out _));
Assert.False(cache.TryGetNextMessage(cursor, out _));
// Enqueue a new batch
// First and last messages destined for stream, following messages
// destined for other streams
EnqueueMessage(streamKey);
for (var idx = 0; idx < 20; idx++)
{
EnqueueMessage(Guid.NewGuid());
}
// Remove first three messages from the cache
cache.RemoveOldestMessage(); // Destined for stream, consumed
cache.RemoveOldestMessage(); // Not destined for stream
cache.RemoveOldestMessage(); // Destined for stream, not consumed
// Enqueue a new message for stream
EnqueueMessage(streamKey);
// Should throw since we missed the second message destined for stream
Assert.Throws <QueueCacheMissException>(() => cache.TryGetNextMessage(cursor, out _));
long EnqueueMessage(Guid streamId)
{
var now = DateTime.UtcNow;
var msg = new TestQueueMessage
{
StreamId = StreamId.Create(TestStreamNamespace, streamId),
SequenceNumber = seqNumber,
};
cache.Add(new List <CachedMessage>()
{
converter.ToCachedMessage(msg, now)
}, now);
seqNumber++;
return(msg.SequenceNumber);
}
}
public void AvoidCacheMissMultipleStreamsActive()
{
var bufferPool = new ObjectPool <FixedSizeBuffer>(() => new FixedSizeBuffer(PooledBufferSize));
var dataAdapter = new TestCacheDataAdapter();
var cache = new PooledQueueCache(dataAdapter, NullLogger.Instance, null, null, TimeSpan.FromSeconds(30));
var evictionStrategy = new ChronologicalEvictionStrategy(NullLogger.Instance, new TimePurgePredicate(TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1)), null, null);
evictionStrategy.PurgeObservable = cache;
var converter = new CachedMessageConverter(bufferPool, evictionStrategy);
var seqNumber = 123;
var streamKey = Guid.NewGuid();
var stream = StreamId.Create(TestStreamNamespace, streamKey);
// Enqueue a message for our stream
var firstSequenceNumber = EnqueueMessage(streamKey);
// Enqueue a few other messages for other streams
EnqueueMessage(Guid.NewGuid());
EnqueueMessage(Guid.NewGuid());
// Consume the first event and see that the cursor has moved to last seen event (not matching our streamIdentity)
var cursor = cache.GetCursor(stream, new EventSequenceTokenV2(firstSequenceNumber));
Assert.True(cache.TryGetNextMessage(cursor, out var firstContainer));
Assert.False(cache.TryGetNextMessage(cursor, out _));
// Remove multiple events, including the one that the cursor is currently pointing to
cache.RemoveOldestMessage();
cache.RemoveOldestMessage();
cache.RemoveOldestMessage();
// Enqueue another message for stream
var lastSequenceNumber = EnqueueMessage(streamKey);
// Should be able to consume the event just pushed
Assert.True(cache.TryGetNextMessage(cursor, out var lastContainer));
Assert.Equal(stream, lastContainer.StreamId);
Assert.Equal(lastSequenceNumber, lastContainer.SequenceToken.SequenceNumber);
long EnqueueMessage(Guid streamId)
{
var now = DateTime.UtcNow;
var msg = new TestQueueMessage
{
StreamId = StreamId.Create(TestStreamNamespace, streamId),
SequenceNumber = seqNumber,
};
cache.Add(new List <CachedMessage>()
{
converter.ToCachedMessage(msg, now)
}, now);
seqNumber++;
return(msg.SequenceNumber);
}
}
public bool MoveNext()
{
IBatchContainer next;
if (!cache.TryGetNextMessage(cursor, out next))
{
return false;
}
current = next;
return true;
}
public void SimpleCacheMiss()
{
var bufferPool = new ObjectPool <FixedSizeBuffer>(() => new FixedSizeBuffer(PooledBufferSize));
var dataAdapter = new TestCacheDataAdapter();
var cache = new PooledQueueCache(dataAdapter, NullLogger.Instance, null, null, TimeSpan.FromSeconds(10));
var evictionStrategy = new ChronologicalEvictionStrategy(NullLogger.Instance, new TimePurgePredicate(TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1)), null, null);
evictionStrategy.PurgeObservable = cache;
var converter = new CachedMessageConverter(bufferPool, evictionStrategy);
int idx;
var seqNumber = 123;
var stream = StreamId.Create(TestStreamNamespace, Guid.NewGuid());
// First and last messages destined for stream, following messages
// destined for other streams
for (idx = 0; idx < 20; idx++)
{
var now = DateTime.UtcNow;
var msg = new TestQueueMessage
{
StreamId = (idx == 0) ? stream : StreamId.Create(TestStreamNamespace, Guid.NewGuid()),
SequenceNumber = seqNumber + idx,
};
cache.Add(new List <CachedMessage>()
{
converter.ToCachedMessage(msg, now)
}, now);
}
var cursor = cache.GetCursor(stream, new EventSequenceTokenV2(seqNumber));
// Remove first message
cache.RemoveOldestMessage();
// Enqueue a new message for stream
{
idx++;
var now = DateTime.UtcNow;
var msg = new TestQueueMessage
{
StreamId = stream,
SequenceNumber = seqNumber + idx,
};
cache.Add(new List <CachedMessage>()
{
converter.ToCachedMessage(msg, now)
}, now);
}
// Should throw since we missed the first message
Assert.Throws <QueueCacheMissException>(() => cache.TryGetNextMessage(cursor, out _));
}
/// <summary>
/// Try to get the next message in the cache for the provided cursor.
/// </summary>
/// <param name="cursorObj"></param>
/// <param name="message"></param>
/// <returns></returns>
public bool TryGetNextMessage(object cursorObj, out IBatchContainer message)
{
if (!cache.TryGetNextMessage(cursorObj, out message))
{
return(false);
}
double cachePressureContribution;
cachePressureMonitor.RecordCachePressureContribution(
TryCalculateCachePressureContribution(message.SequenceToken, out cachePressureContribution)
? cachePressureContribution
: 0.0);
return(true);
}
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);
}
private int RunGoldenPath(PooledQueueCache <TestQueueMessage, TestCachedMessage> cache, int startOfCache)
{
int sequenceNumber = startOfCache;
IBatchContainer batch;
IStreamIdentity stream1 = new StreamIdentity(Guid.NewGuid(), TestStreamNamespace);
IStreamIdentity stream2 = new StreamIdentity(Guid.NewGuid(), TestStreamNamespace);
// now add messages into cache newer than cursor
// Adding enough to fill the pool
List <TestQueueMessage> messages = Enumerable.Range(0, MessagesPerBuffer * PooledBufferCount)
.Select(i => new TestQueueMessage
{
StreamGuid = i % 2 == 0 ? stream1.Guid : stream2.Guid,
StreamNamespace = TestStreamNamespace,
SequenceNumber = sequenceNumber + i
})
.ToList();
cache.Add(messages, DateTime.UtcNow);
sequenceNumber += MessagesPerBuffer * PooledBufferCount;
// get cursor for stream1, walk all the events in the stream using the cursor
object stream1Cursor = cache.GetCursor(stream1, new EventSequenceTokenV2(startOfCache));
int stream1EventCount = 0;
while (cache.TryGetNextMessage(stream1Cursor, out batch))
{
Assert.NotNull(stream1Cursor);
Assert.NotNull(batch);
Assert.Equal(stream1.Guid, batch.StreamGuid);
Assert.Equal(TestStreamNamespace, batch.StreamNamespace);
Assert.NotNull(batch.SequenceToken);
stream1EventCount++;
}
Assert.Equal((sequenceNumber - startOfCache) / 2, stream1EventCount);
// get cursor for stream2, walk all the events in the stream using the cursor
object stream2Cursor = cache.GetCursor(stream2, new EventSequenceTokenV2(startOfCache));
int stream2EventCount = 0;
while (cache.TryGetNextMessage(stream2Cursor, out batch))
{
Assert.NotNull(stream2Cursor);
Assert.NotNull(batch);
Assert.Equal(stream2.Guid, batch.StreamGuid);
Assert.Equal(TestStreamNamespace, batch.StreamNamespace);
Assert.NotNull(batch.SequenceToken);
stream2EventCount++;
}
Assert.Equal((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++)
{
List <TestQueueMessage> moreMessages = Enumerable.Range(0, MessagesPerBuffer)
.Select(i => new TestQueueMessage
{
StreamGuid = i % 2 == 0 ? stream1.Guid : stream2.Guid,
StreamNamespace = TestStreamNamespace,
SequenceNumber = sequenceNumber + i
})
.ToList();
cache.Add(moreMessages, DateTime.UtcNow);
sequenceNumber += MessagesPerBuffer;
// walk all the events in the stream using the cursor
while (cache.TryGetNextMessage(stream1Cursor, out batch))
{
Assert.NotNull(stream1Cursor);
Assert.NotNull(batch);
Assert.Equal(stream1.Guid, batch.StreamGuid);
Assert.Equal(TestStreamNamespace, batch.StreamNamespace);
Assert.NotNull(batch.SequenceToken);
stream1EventCount++;
}
Assert.Equal((sequenceNumber - startOfCache) / 2, stream1EventCount);
// walk all the events in the stream using the cursor
while (cache.TryGetNextMessage(stream2Cursor, out batch))
{
Assert.NotNull(stream2Cursor);
Assert.NotNull(batch);
Assert.Equal(stream2.Guid, batch.StreamGuid);
Assert.Equal(TestStreamNamespace, batch.StreamNamespace);
Assert.NotNull(batch.SequenceToken);
stream2EventCount++;
}
Assert.Equal((sequenceNumber - startOfCache) / 2, stream2EventCount);
}
return(sequenceNumber);
}
private void AvoidCacheMiss(bool emptyCache)
{
var bufferPool = new ObjectPool <FixedSizeBuffer>(() => new FixedSizeBuffer(PooledBufferSize));
var dataAdapter = new TestCacheDataAdapter();
var cache = new PooledQueueCache(dataAdapter, NullLogger.Instance, null, null, TimeSpan.FromSeconds(30));
var evictionStrategy = new ChronologicalEvictionStrategy(NullLogger.Instance, new TimePurgePredicate(TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1)), null, null);
evictionStrategy.PurgeObservable = cache;
var converter = new CachedMessageConverter(bufferPool, evictionStrategy);
var seqNumber = 123;
var stream = StreamId.Create(TestStreamNamespace, Guid.NewGuid());
// Enqueue a message for stream
var firstSequenceNumber = EnqueueMessage(stream);
// Consume first event
var cursor = cache.GetCursor(stream, new EventSequenceTokenV2(firstSequenceNumber));
Assert.True(cache.TryGetNextMessage(cursor, out var firstContainer));
Assert.Equal(stream, firstContainer.StreamId);
Assert.Equal(firstSequenceNumber, firstContainer.SequenceToken.SequenceNumber);
// Remove first message, that was consumed
cache.RemoveOldestMessage();
if (!emptyCache)
{
// Enqueue something not related to the stream
// so the cache isn't empty
EnqueueMessage(StreamId.Create(TestStreamNamespace, Guid.NewGuid()));
EnqueueMessage(StreamId.Create(TestStreamNamespace, Guid.NewGuid()));
EnqueueMessage(StreamId.Create(TestStreamNamespace, Guid.NewGuid()));
EnqueueMessage(StreamId.Create(TestStreamNamespace, Guid.NewGuid()));
EnqueueMessage(StreamId.Create(TestStreamNamespace, Guid.NewGuid()));
EnqueueMessage(StreamId.Create(TestStreamNamespace, Guid.NewGuid()));
}
// Enqueue another message for stream
var lastSequenceNumber = EnqueueMessage(stream);
// Should be able to consume the event just pushed
Assert.True(cache.TryGetNextMessage(cursor, out var lastContainer));
Assert.Equal(stream, lastContainer.StreamId);
Assert.Equal(lastSequenceNumber, lastContainer.SequenceToken.SequenceNumber);
long EnqueueMessage(StreamId streamId)
{
var now = DateTime.UtcNow;
var msg = new TestQueueMessage
{
StreamId = streamId,
SequenceNumber = seqNumber,
};
cache.Add(new List <CachedMessage>()
{
converter.ToCachedMessage(msg, now)
}, now);
seqNumber++;
return(msg.SequenceNumber);
}
}