private static void GetRecordingExtent(AeronArchive archive, RecordingExtent recordingExtent, Entry entry)
{
if (archive.ListRecording(entry.recordingId, recordingExtent) == 0)
{
throw new InvalidOperationException("Unknown recording id: " + entry.recordingId);
}
}
private void LoadSnapshot(long recordingId)
{
using (AeronArchive archive = AeronArchive.Connect(archiveCtx))
{
RecordingExtent recordingExtent = new RecordingExtent();
if (0 == archive.ListRecording(recordingId, recordingExtent))
{
throw new System.InvalidOperationException("Could not find recordingId: " + recordingId);
}
string channel = ctx.ReplayChannel();
int streamId = ctx.ReplayStreamId();
long length = recordingExtent.stopPosition - recordingExtent.startPosition;
int sessionId = (int)archive.StartReplay(recordingId, 0, length, channel, streamId);
string replaySessionChannel = ChannelUri.AddSessionId(channel, sessionId);
using (Subscription subscription = aeron.AddSubscription(replaySessionChannel, streamId))
{
Image image = AwaitImage(sessionId, subscription);
LoadState(image);
service.OnLoadSnapshot(image);
}
}
}
internal static ReplayStep PlanRecovery(List <ReplayStep> steps, List <Entry> entries, AeronArchive archive)
{
if (entries.Count == 0)
{
return(null);
}
int snapshotIndex = -1;
for (int i = entries.Count - 1; i >= 0; i--)
{
Entry entry = entries[i];
if (ENTRY_TYPE_SNAPSHOT == entry.type)
{
snapshotIndex = i;
}
}
ReplayStep snapshotStep;
RecordingExtent recordingExtent = new RecordingExtent();
if (-1 != snapshotIndex)
{
Entry snapshot = entries[snapshotIndex];
GetRecordingExtent(archive, recordingExtent, snapshot);
snapshotStep = new ReplayStep(recordingExtent.startPosition, recordingExtent.stopPosition, snapshot);
if (snapshotIndex - 1 >= 0)
{
for (int i = snapshotIndex - 1; i >= 0; i--)
{
Entry entry = entries[i];
if (ENTRY_TYPE_TERM == entry.type)
{
GetRecordingExtent(archive, recordingExtent, snapshot);
long snapshotPosition = snapshot.logPosition + snapshot.termPosition;
if (recordingExtent.stopPosition == AeronArchive.NULL_POSITION ||
(entry.logPosition + recordingExtent.stopPosition) > snapshotPosition)
{
steps.Add(new ReplayStep(snapshot.termPosition, recordingExtent.stopPosition, entry));
}
break;
}
}
}
}
else
{
snapshotStep = null;
}
for (int i = snapshotIndex + 1, length = entries.Count; i < length; i++)
{
Entry entry = entries[i];
GetRecordingExtent(archive, recordingExtent, entry);
steps.Add(new ReplayStep(recordingExtent.startPosition, recordingExtent.stopPosition, entry));
}
return(snapshotStep);
}
