/// <summary>
/// Pooled cache for generator stream provider
/// </summary>
/// <param name="bufferPool"></param>
/// <param name="logger"></param>
/// <param name="serializationManager"></param>
public GeneratorPooledCache(IObjectPool <FixedSizeBuffer> bufferPool, Logger logger, SerializationManager serializationManager)
{
var dataAdapter = new CacheDataAdapter(bufferPool, serializationManager);
cache = new PooledQueueCache <GeneratedBatchContainer, CachedMessage>(dataAdapter, CacheDataComparer.Instance, logger);
var evictionStrategy = new ExplicitEvictionStrategy();
evictionStrategy.PurgeObservable = cache;
dataAdapter.OnBlockAllocated = evictionStrategy.OnBlockAllocated;
}
/// <summary>
/// Pooled cache for memory stream provider
/// </summary>
/// <param name="bufferPool"></param>
/// <param name="logger"></param>
/// <param name="serializer"></param>
public MemoryPooledCache(IObjectPool <FixedSizeBuffer> bufferPool, Logger logger, TSerializer serializer)
{
var dataAdapter = new CacheDataAdapter(bufferPool, serializer);
cache = new PooledQueueCache <MemoryMessageData, MemoryMessageData>(dataAdapter, CacheDataComparer.Instance, logger);
var evictionStrategy = new ExplicitEvictionStrategy();
evictionStrategy.PurgeObservable = cache;
dataAdapter.OnBlockAllocated = evictionStrategy.OnBlockAllocated;
}
public void GoldenPathTest()
{
var bufferPool = new TestBlockPool();
var dataAdapter = new TestCacheDataAdapter(bufferPool);
var cache = new PooledQueueCache <TestQueueMessage, TestCachedMessage>(dataAdapter, TestCacheDataComparer.Instance, NoOpTestLogger.Instance);
var evictionStrategy = new ExplicitEvictionStrategy();
evictionStrategy.PurgeObservable = cache;
dataAdapter.OnBlockAllocated = evictionStrategy.OnBlockAllocated;
RunGoldenPath(cache, 111);
}
public void QueueCacheMissTest()
{
var bufferPool = new TestBlockPool();
var dataAdapter = new TestCacheDataAdapter(bufferPool);
var cache = new PooledQueueCache <TestQueueMessage, TestCachedMessage>(dataAdapter, TestCacheDataComparer.Instance, NoOpTestLogger.Instance);
var evictionStrategy = new ExplicitEvictionStrategy();
evictionStrategy.PurgeObservable = cache;
dataAdapter.OnBlockAllocated = evictionStrategy.OnBlockAllocated;
int sequenceNumber = 10;
IBatchContainer batch;
IStreamIdentity streamId = new StreamIdentity(Guid.NewGuid(), TestStreamNamespace);
// No data in cache, cursors should not throw.
object cursor = cache.GetCursor(streamId, new EventSequenceTokenV2(sequenceNumber++));
Assert.NotNull(cursor);
// try to iterate, should throw
bool gotNext = cache.TryGetNextMessage(cursor, out batch);
Assert.NotNull(cursor);
Assert.False(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 = TestStreamNamespace,
SequenceNumber = sequenceNumber++,
}, DateTime.UtcNow);
}
// 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.NotNull(ex);
// Try getting new cursor into cache from data before the cache. Should throw
ex = null;
try
{
cache.GetCursor(streamId, new EventSequenceTokenV2(10));
}
catch (QueueCacheMissException cacheMissException)
{
ex = cacheMissException;
}
Assert.NotNull(ex);
// Get valid cursor into cache
cursor = cache.GetCursor(streamId, new EventSequenceTokenV2(13));
// query once, to make sure cursor is good
gotNext = cache.TryGetNextMessage(cursor, out batch);
Assert.NotNull(cursor);
Assert.True(gotNext);
// Since pool should be full, adding one more message should trigger the cache to purge.
cache.Add(new TestQueueMessage
{
StreamGuid = streamId.Guid,
StreamNamespace = TestStreamNamespace,
SequenceNumber = sequenceNumber,
}, DateTime.UtcNow);
// After purge, use of cursor should throw.
ex = null;
try
{
cache.TryGetNextMessage(cursor, out batch);
}
catch (QueueCacheMissException cacheMissException)
{
ex = cacheMissException;
}
Assert.NotNull(ex);
}
