public async Task Should_reuse_pages_when_data_appended(int numberOfPages)
{
string filename = FileHeader.Canonize("test");
var file = SyncTestUtils.PreparePagesStream(numberOfPages);
var sourceContent = new CombinedStream(file, SyncTestUtils.PreparePagesStream(numberOfPages));
// add new pages at the end
var destinationContent = file;
sourceContent.Position = 0;
await source.UploadAsync(filename, sourceContent);
destinationContent.Position = 0;
await destination.UploadAsync(filename, destinationContent);
var contentUpdate = new ContentUpdateWorkItem(filename, "http://localhost:12345", sourceRfs.Storage, sourceRfs.SigGenerator);
// force to upload entire file, we just want to check which pages will be reused
await contentUpdate.UploadToAsync(destination.Synchronization);
await destination.Synchronization.ResolveConflictAsync(filename, ConflictResolutionStrategy.RemoteVersion);
await contentUpdate.UploadToAsync(destination.Synchronization);
FileAndPagesInformation fileAndPages = null;
destinationRfs.Storage.Batch(accessor => fileAndPages = accessor.GetFile(filename, 0, 2 * numberOfPages));
Assert.Equal(2*numberOfPages, fileAndPages.Pages.Count);
for(var i = 0; i < numberOfPages; i++)
{
Assert.Equal(i + 1, fileAndPages.Pages[i].Id);
// if page ids are in the original order it means that they were used the existing pages
}
sourceContent.Position = 0;
Assert.Equal(sourceContent.GetMD5Hash(), destination.GetMetadataForAsync(filename).Result["Content-MD5"]);
}
public void Should_reuse_second_page_if_only_first_one_changed()
{
string filename = FileHeader.Canonize("test");
var file = SyncTestUtils.PreparePagesStream(2);
file.Position = 0;
var sourceContent = new MemoryStream();
file.CopyTo(sourceContent);
sourceContent.Position = 0;
sourceContent.Write(new byte[] {0, 0, 0, 0}, 0, 4); // change content of the 1st page
var destinationContent = file;
sourceContent.Position = 0;
source.UploadAsync(filename, sourceContent).Wait();
destinationContent.Position = 0;
destination.UploadAsync(filename, destinationContent).Wait();
var contentUpdate = new ContentUpdateWorkItem(filename, "http://localhost:12345", sourceRfs.Storage,
sourceRfs.SigGenerator);
sourceContent.Position = 0;
// force to upload entire file, we just want to check which pages will be reused
contentUpdate.UploadToAsync(destination.Synchronization).Wait();
destination.Synchronization.ResolveConflictAsync(filename, ConflictResolutionStrategy.RemoteVersion).Wait();
contentUpdate.UploadToAsync(destination.Synchronization).Wait();
FileAndPagesInformation fileAndPages = null;
destinationRfs.Storage.Batch(accessor => fileAndPages = accessor.GetFile(filename, 0, 256));
Assert.Equal(2, fileAndPages.Pages.Count);
Assert.Equal(3, fileAndPages.Pages[0].Id); // new page -> id == 3
Assert.Equal(2, fileAndPages.Pages[1].Id); // reused page -> id still == 2
sourceContent.Position = 0;
Assert.Equal(sourceContent.GetMD5Hash(), destination.GetMetadataForAsync(filename).Result["Content-MD5"]);
}
public async Task Should_reuse_pages_where_nothing_has_changed()
{
string filename = FileHeader.Canonize("test");
var file = SyncTestUtils.PreparePagesStream(3);
file.Position = 0;
var sourceContent = new MemoryStream();
file.CopyTo(sourceContent);
sourceContent.Position = StorageConstants.MaxPageSize + 1;
sourceContent.Write(new byte[] {0, 0, 0, 0}, 0, 4); // change content of the 2nd page
var destinationContent = file;
sourceContent.Position = 0;
await source.UploadAsync(filename, sourceContent);
destinationContent.Position = 0;
await destination.UploadAsync(filename, destinationContent);
var contentUpdate = new ContentUpdateWorkItem(filename, "http://localhost:12345", sourceRfs.Storage, sourceRfs.SigGenerator);
sourceContent.Position = 0;
// force to upload entire file, we just want to check which pages will be reused
await contentUpdate.UploadToAsync(destination.Synchronization);
await destination.Synchronization.ResolveConflictAsync(filename, ConflictResolutionStrategy.RemoteVersion);
await contentUpdate.UploadToAsync(destination.Synchronization);
FileAndPagesInformation fileAndPages = null;
destinationRfs.Storage.Batch(accessor => fileAndPages = accessor.GetFile(filename, 0, 256));
Assert.Equal(3, fileAndPages.Pages.Count);
Assert.Equal(1, fileAndPages.Pages[0].Id); // reused page
Assert.Equal(4, fileAndPages.Pages[1].Id); // new page -> id == 4
Assert.Equal(3, fileAndPages.Pages[2].Id); // reused page
sourceContent.Position = 0;
var metadata = await destination.GetMetadataForAsync(filename);
Assert.Equal(sourceContent.GetMD5Hash(), metadata.Value<string>("Content-MD5"));
}
