public void TestReopenAfterReadWriteStoreModifiedException()
{
ulong pageId;
var buffer1 = new byte[] {1, 1, 1, 1};
var buffer2 = new byte[] {2, 2, 2, 2};
var buffer3 = new byte[] {3, 3, 3, 3};
using (
var pageStore = TestUtils.CreateEmptyPageStore("TestStoreModifiedExceptionThrown.data",
PersistenceType.Rewrite))
{
var page = pageStore.Create(1);
pageId = page.Id;
page.SetData(buffer1, 0, 0, 4);
pageStore.Commit(1, null);
}
var readStore = new BinaryFilePageStore(TestUtils.PersistenceManager,
"TestStoreModifiedExceptionThrown.data",
BPlusTreeStoreManager.PageSize, true, 1);
try
{
var page = readStore.Retrieve(1, null);
Assert.AreEqual(1, page.Data[0]);
using (
var writeStore = new BinaryFilePageStore(TestUtils.PersistenceManager,
"TestStoreModifiedExceptionThrown.data",
BPlusTreeStoreManager.PageSize, true, 1))
{
var writePage = writeStore.Retrieve(pageId, null);
writePage = writeStore.GetWriteablePage(2, writePage);
writePage.SetData(buffer2, 0, 0, 4);
writeStore.Commit(2, null);
}
page = readStore.Retrieve(1, null);
Assert.AreEqual(1, page.Data[0]);
using (
var writeStore = new BinaryFilePageStore(TestUtils.PersistenceManager,
"TestStoreModifiedExceptionThrown.data",
BPlusTreeStoreManager.PageSize, true, 2))
{
var writePage = writeStore.Retrieve(pageId, null);
writePage = writeStore.GetWriteablePage(3, writePage);
writePage.SetData(buffer3, 0, 0, 4);
writeStore.Commit(3, null);
}
try
{
readStore.Retrieve(pageId, null);
Assert.Fail("Expected ReadWriteStoreModifiedException to be thrown");
}
catch (ReadWriteStoreModifiedException)
{
readStore.Close();
readStore.Dispose();
readStore = null;
readStore = new BinaryFilePageStore(TestUtils.PersistenceManager,
"TestStoreModifiedExceptionThrown.data",
BPlusTreeStoreManager.PageSize, true, 3);
page = readStore.Retrieve(pageId, null);
Assert.AreEqual(3, page.Data[0]);
}
}
finally
{
if (readStore != null)
{
readStore.Dispose();
}
}
}
public void CreateSnapshot(string srcStoreLocation, string destStoreLocation,
PersistenceType storePersistenceType, ulong commitPointId = StoreConstants.NullUlong)
{
Logging.LogInfo("Snapshot store {0} to new store {1} with persistence type {2}", srcStoreLocation,
destStoreLocation, storePersistenceType);
if (_persistenceManager.DirectoryExists(destStoreLocation))
{
throw new StoreManagerException(destStoreLocation, "Store already exists");
}
// Open the source store for reading
using (IStore srcStore = commitPointId == StoreConstants.NullUlong
? OpenStore(srcStoreLocation, true)
: OpenStore(srcStoreLocation, commitPointId))
{
// Create the directory for the destination store
_persistenceManager.CreateDirectory(destStoreLocation);
// Create empty data file
var dataFilePath = Path.Combine(destStoreLocation, DataFileName);
_persistenceManager.CreateFile(dataFilePath);
// Create initial master file
var destStoreConfiguration = _storeConfiguration.Clone() as StoreConfiguration;
destStoreConfiguration.PersistenceType = storePersistenceType;
var destMasterFile = MasterFile.Create(_persistenceManager, destStoreLocation, destStoreConfiguration,
Guid.NewGuid());
// Copy resource files from source store
var resourceFilePath = Path.Combine(destStoreLocation, ResourceFileName);
_persistenceManager.CopyFile(Path.Combine(srcStoreLocation, ResourceFileName), resourceFilePath, true);
// Initialize data page store
IPageStore destPageStore = null;
switch (storePersistenceType)
{
case PersistenceType.AppendOnly:
destPageStore = new AppendOnlyFilePageStore(_persistenceManager, dataFilePath, PageSize, false,
_storeConfiguration.DisableBackgroundWrites);
break;
case PersistenceType.Rewrite:
destPageStore = new BinaryFilePageStore(_persistenceManager, dataFilePath, PageSize, false, 0, 1, _storeConfiguration.DisableBackgroundWrites);
break;
default:
throw new BrightstarInternalException("Unrecognized target store type: " + storePersistenceType);
}
// Copy Data
ulong destStorePageId = srcStore.CopyTo(destPageStore, 1ul);
destPageStore.Close();
destMasterFile.AppendCommitPoint(
new CommitPoint(destStorePageId, 1ul, DateTime.UtcNow, Guid.Empty), true);
}
}