private EventStreamCursor(EventStreamHeader streamHeader, StreamVersion fromVersion, FetchEvents fetch)
{
Require.NotNull(fetch, "fetch");
m_state = new InitialCursorState(streamHeader, fromVersion, fetch);
m_slice = EventStreamSlice.Empty;
m_cursorStreamVersion = fromVersion;
}
public EventStreamCursor(EventStreamPosition position, StreamVersion fromVersion, FetchEvents fetch)
{
Require.NotNull(fetch, "fetch");
if (EventStreamPosition.IsNewStream(position))
{
m_state = new EndOfStreamCursorState();
m_slice = EventStreamSlice.Empty;
}
else
{
m_state = new InitialCursorState(position, fromVersion, fetch);
}
}
public override async Task<EventStreamSlice> FetchSlice()
{
var slice = new EventStreamSlice(m_position, await m_fetch(m_currentSlicePosition.Version.Increment(1)));
if (slice.EndOfStream)
{
NextState = new EndOfStreamCursorState();
}
else
{
NextState = new FetchingCursorState(m_position, slice.SlicePosition, m_fetch);
}
return slice;
}
public override async Task <EventStreamSlice> FetchSlice()
{
var fetchResult = await m_fetch(m_version);
var slice = new EventStreamSlice(fetchResult.Events);
if (fetchResult.IsFetchingCompleted)
{
NextState = new EndOfStreamCursorState(StreamHeader);
}
else
{
NextState = new FetchingCursorState(StreamHeader, slice.ToStreamVersion.Increment(), m_fetch);
}
return(slice);
}
public async Task FetchSlice()
{
m_slice = await m_state.FetchSlice();
m_state = m_state.NextState;
}
public async Task FetchSlice()
{
m_slice = await m_state.FetchSlice();
m_state = m_state.NextState;
}
private EventStreamCursor()
{
m_state = new EndOfStreamCursorState(EventStreamHeader.Unknown);
m_slice = EventStreamSlice.Empty;
}
private EventStreamCursor(EventStreamHeader streamHeader, StreamVersion fromVersion)
{
m_state = new EndOfStreamCursorState(streamHeader);
m_slice = EventStreamSlice.Empty;
m_cursorStreamVersion = fromVersion;
}