public void CloudBlobSnapshotAPM()
{
CloudBlobContainer container = GetRandomContainerReference();
try
{
container.Create();
var blobName = GetRandomBlobName();
MemoryStream originalData = new MemoryStream(GetRandomBuffer(1024));
CloudAppendBlob appendBlob = container.GetAppendBlobReference(blobName);
appendBlob.CreateOrReplace();
appendBlob.AppendBlock(originalData, null);
CloudBlob blob = container.GetBlobReference(blobName);
blob.FetchAttributes();
IAsyncResult result;
using (AutoResetEvent waitHandle = new AutoResetEvent(false))
{
result = blob.BeginSnapshot(ar => waitHandle.Set(), null);
waitHandle.WaitOne();
CloudBlob snapshot1 = blob.EndSnapshot(result);
Assert.AreEqual(blob.Properties.ETag, snapshot1.Properties.ETag);
Assert.AreEqual(blob.Properties.LastModified, snapshot1.Properties.LastModified);
Assert.IsTrue(snapshot1.IsSnapshot);
Assert.IsNotNull(snapshot1.SnapshotTime, "Snapshot does not have SnapshotTime set");
Assert.AreEqual(blob.Uri, snapshot1.Uri);
Assert.AreNotEqual(blob.SnapshotQualifiedUri, snapshot1.SnapshotQualifiedUri);
Assert.AreNotEqual(snapshot1.Uri, snapshot1.SnapshotQualifiedUri);
Assert.IsTrue(snapshot1.SnapshotQualifiedUri.Query.Contains("snapshot"));
result = blob.BeginSnapshot(ar => waitHandle.Set(), null);
waitHandle.WaitOne();
CloudBlob snapshot2 = blob.EndSnapshot(result);
Assert.IsTrue(snapshot2.SnapshotTime.Value > snapshot1.SnapshotTime.Value);
snapshot1.FetchAttributes();
snapshot2.FetchAttributes();
blob.FetchAttributes();
AssertAreEqual(snapshot1.Properties, blob.Properties);
CloudBlob snapshotCopy = container.GetBlobReference("blob2");
result = snapshotCopy.BeginStartCopy(snapshot1.Uri, null, null, null, null, ar => waitHandle.Set(), null);
waitHandle.WaitOne();
snapshotCopy.EndStartCopy(result);
WaitForCopy(snapshotCopy);
Assert.AreEqual(CopyStatus.Success, snapshotCopy.CopyState.Status);
result = snapshot1.BeginOpenRead(ar => waitHandle.Set(), null);
waitHandle.WaitOne();
using (Stream snapshotStream = snapshot1.EndOpenRead(result))
{
snapshotStream.Seek(0, SeekOrigin.End);
TestHelper.AssertStreamsAreEqual(originalData, snapshotStream);
}
result = appendBlob.BeginCreateOrReplace(ar => waitHandle.Set(), null);
waitHandle.WaitOne();
appendBlob.EndCreateOrReplace(result);
result = blob.BeginFetchAttributes(ar => waitHandle.Set(), null);
waitHandle.WaitOne();
blob.EndFetchAttributes(result);
result = snapshot1.BeginOpenRead(ar => waitHandle.Set(), null);
waitHandle.WaitOne();
using (Stream snapshotStream = snapshot1.EndOpenRead(result))
{
snapshotStream.Seek(0, SeekOrigin.End);
TestHelper.AssertStreamsAreEqual(originalData, snapshotStream);
}
List <IListBlobItem> blobs = container.ListBlobs(null, true, BlobListingDetails.All, null, null).ToList();
Assert.AreEqual(4, blobs.Count);
AssertAreEqual(snapshotCopy, (CloudBlob)blobs[0]);
AssertAreEqual(snapshot1, (CloudBlob)blobs[1]);
AssertAreEqual(snapshot2, (CloudBlob)blobs[2]);
AssertAreEqual(blob, (CloudBlob)blobs[3]);
}
}
finally
{
container.DeleteIfExists();
}
}
