public async IAsyncEnumerable <IEnumerable <object> > ReadLatestDocumentsAsync(long upToTimeStamp)
{
if (_initialized == null)
{
throw new InvalidOperationException("InitializeAsync hasn't been called");
}
using (var indexBuffer =
await LoadBlocksAsync(_initialized.Fat.DocumentPartition.IndexBlocks))
using (var contentBuffer =
await LoadBlocksAsync(_initialized.Fat.DocumentPartition.ContentBlocks))
{
var indexed = new SortedIndexedDocumentEnumerable(
indexBuffer.Buffer,
_initialized.Fat.DocumentPartition.IndexBlocks.Sum(b => (int)b.Size),
contentBuffer.Buffer);
var latestDocuments = from i in indexed.GetLatestItems(upToTimeStamp)
select i.content;
yield return(latestDocuments);
}
}
public async Task GetLatestItems()
{
var indexingBuffer = new IndexingBuffer(
20000,
20000,
(indexBuffer, indexSize, contentBuffer, contentSize) =>
{
var enumerable = new SortedIndexedDocumentEnumerable(
indexBuffer,
indexSize,
contentBuffer);
var allItems = enumerable.GetLatestItems(3).ToArray();
dynamic content1 = allItems[0].content;
dynamic content2 = allItems[1].content;
dynamic content3 = allItems[2].content;
Assert.NotEqual(content1.name, content2.name);
Assert.NotEqual(content2.name, content3.name);
return(Task.CompletedTask);
});
var doc1 = new { name = "Joe" };
var doc2 = new { name = "Bob" };
var doc3 = new { name = "Arthur" };
var buffer1 = Serialize(doc1);
var buffer2 = Serialize(doc2);
var buffer3 = Serialize(doc3);
var meta1 = new DocumentMetaData("joe", null, 1, buffer1.Length);
var meta2 = new DocumentMetaData("bob", null, 2, buffer2.Length);
var meta3 = new DocumentMetaData("ar", null, 3, buffer3.Length);
await indexingBuffer.WriteAsync(meta1, buffer1);
await indexingBuffer.WriteAsync(meta2, buffer2);
await indexingBuffer.WriteAsync(meta3, buffer3);
await indexingBuffer.FlushAsync();
}
