/// <summary>Return a manifest of what finalized edit logs are available.</summary>
/// <remarks>
/// Return a manifest of what finalized edit logs are available. All available
/// edit logs are returned starting from the transaction id passed. If
/// 'fromTxId' falls in the middle of a log, that log is returned as well.
/// </remarks>
/// <param name="fromTxId">Starting transaction id to read the logs.</param>
/// <returns>RemoteEditLogManifest object.</returns>
public virtual RemoteEditLogManifest GetEditLogManifest(long fromTxId)
{
lock (this)
{
// Collect RemoteEditLogs available from each FileJournalManager
IList <RemoteEditLog> allLogs = Lists.NewArrayList();
foreach (JournalSet.JournalAndStream j in journals)
{
if (j.GetManager() is FileJournalManager)
{
FileJournalManager fjm = (FileJournalManager)j.GetManager();
try
{
Sharpen.Collections.AddAll(allLogs, fjm.GetRemoteEditLogs(fromTxId, false));
}
catch (Exception t)
{
Log.Warn("Cannot list edit logs in " + fjm, t);
}
}
}
// Group logs by their starting txid
ImmutableListMultimap <long, RemoteEditLog> logsByStartTxId = Multimaps.Index(allLogs
, RemoteEditLog.GetStartTxid);
long curStartTxId = fromTxId;
IList <RemoteEditLog> logs = Lists.NewArrayList();
while (true)
{
ImmutableList <RemoteEditLog> logGroup = ((ImmutableList <RemoteEditLog>)logsByStartTxId
.Get(curStartTxId));
if (logGroup.IsEmpty())
{
// we have a gap in logs - for example because we recovered some old
// storage directory with ancient logs. Clear out any logs we've
// accumulated so far, and then skip to the next segment of logs
// after the gap.
ICollection <long> startTxIds = Sets.NewTreeSet(logsByStartTxId.KeySet());
startTxIds = startTxIds.TailSet(curStartTxId);
if (startTxIds.IsEmpty())
{
break;
}
else
{
if (Log.IsDebugEnabled())
{
Log.Debug("Found gap in logs at " + curStartTxId + ": " + "not returning previous logs in manifest."
);
}
logs.Clear();
curStartTxId = startTxIds.First();
continue;
}
}
// Find the one that extends the farthest forward
RemoteEditLog bestLog = Sharpen.Collections.Max(logGroup);
logs.AddItem(bestLog);
// And then start looking from after that point
curStartTxId = bestLog.GetEndTxId() + 1;
}
RemoteEditLogManifest ret = new RemoteEditLogManifest(logs);
if (Log.IsDebugEnabled())
{
Log.Debug("Generated manifest for logs since " + fromTxId + ":" + ret);
}
return(ret);
}
}
/// <exception cref="System.IO.IOException"/>
private static string GetLogsAsString(FileJournalManager fjm, long firstTxId)
{
return(Joiner.On(",").Join(fjm.GetRemoteEditLogs(firstTxId, false)));
}