public void CachingDataLoaderFactory_InvokesLatch()
{
var latchMock = new DataLoaderConfigurationLatchMock();
var dataLoaderStub = new FakeDataLoader();
var table = new TableDescription("table", Enumerable.Empty<ColumnDescription>());
var storeProxy = CreateFakeStoreProxy();
ITableDataLoaderFactory factory =
new CachingTableDataLoaderFactory(dataLoaderStub, latchMock, storeProxy);
// The latch should not have been invoked yet
Assert.AreEqual(0, latchMock.AcquireCallCount);
Assert.AreEqual(0, latchMock.ReleaseCallCount);
using (factory)
{
// This invocation should make the factory using the latch
factory.CreateTableDataLoader(table);
// The latch should have been acquired
Assert.AreEqual(1, latchMock.AcquireCallCount);
Assert.AreEqual(0, latchMock.ReleaseCallCount);
}
// The latch should have been released
Assert.AreEqual(1, latchMock.AcquireCallCount);
Assert.AreEqual(1, latchMock.ReleaseCallCount);
}
public void CachingDataLoaderFactory_IgnoresLatch()
{
var latchMock = new DataLoaderConfigurationLatchMock();
var stub = new FakeDataLoader();
var storeProxy = CreateFakeStoreProxy();
var table = new TableDescription("table", Enumerable.Empty<ColumnDescription>());
ITableDataLoaderFactory factory =
new CachingTableDataLoaderFactory(stub, latchMock, storeProxy);
using (factory)
{
// The CreateTableDataLoader is not invoked
}
// The latch should not have been invoked
Assert.AreEqual(0, latchMock.AcquireCallCount);
}
public void CachingDataLoaderFactory_SingleTablesSingleQuery()
{
var dataLoaderMock = new FakeDataLoader();
var storeProxy = CreateFakeStoreProxy();
ITableDataLoaderFactory factory =
new CachingTableDataLoaderFactory(dataLoaderMock, null, storeProxy);
// First call
var table = new TableDescription("table", Enumerable.Empty<ColumnDescription>());
factory.CreateTableDataLoader(table);
// Second call (should return the ITableDataLoader from cache)
factory.CreateTableDataLoader(table);
Assert.AreEqual(1, dataLoaderMock.CreateTableDataLoaderCallCount);
Assert.AreEqual(1, storeProxy.CachedItemReturnCount);
}
public void CachingDataLoaderFactory_MoreTablesMoreQuery()
{
var dataLoaderMock = new FakeDataLoader();
var storeProxy = CreateFakeStoreProxy();
ITableDataLoaderFactory factory =
new CachingTableDataLoaderFactory(dataLoaderMock, null, storeProxy);
// First call
var table1 = new TableDescription("table1", Enumerable.Empty<ColumnDescription>());
factory.CreateTableDataLoader(table1);
// Second call (another table, the cache should not be used)
var table2 = new TableDescription("table2", Enumerable.Empty<ColumnDescription>());
factory.CreateTableDataLoader(table2);
Assert.AreEqual(2, dataLoaderMock.CreateTableDataLoaderCallCount);
Assert.AreEqual(0, storeProxy.CachedItemReturnCount);
}
public void CachingDataLoaderFactory_ReturnsSameData()
{
var latchMock = new DataLoaderConfigurationLatchMock();
var stub = new FakeDataLoader();
var storeProxy = CreateFakeStoreProxy();
var table = new TableDescription("table", Enumerable.Empty<ColumnDescription>());
CachingTableDataLoaderFactory factory =
new CachingTableDataLoaderFactory(stub, latchMock, storeProxy);
var data1 = factory.CreateTableDataLoader(table).GetData();
var data2 = factory.CreateTableDataLoader(table).GetData();
Enumerable.SequenceEqual(data1, data2);
// The returned datasets should be exactly the same (same reference)
Assert.AreEqual(data1, data2);
}