/// <summary>Update the path with prepending version number and hostname</summary>
/// <param name="path">- to be updated in zookeeper</param>
/// <exception cref="System.IO.IOException"/>
internal virtual void Update(string path)
{
BKJournalProtos.CurrentInprogressProto.Builder builder = BKJournalProtos.CurrentInprogressProto
.NewBuilder();
builder.SetPath(path).SetHostname(hostName);
string content = TextFormat.PrintToString(((BKJournalProtos.CurrentInprogressProto
)builder.Build()));
try
{
zkc.SetData(this.currentInprogressNode, Sharpen.Runtime.GetBytesForString(content
, Charsets.Utf8), this.versionNumberForPermission);
}
catch (KeeperException e)
{
throw new IOException("Exception when setting the data " + "[" + content + "] to CurrentInprogress. "
, e);
}
catch (Exception e)
{
throw new IOException("Interrupted while setting the data " + "[" + content + "] to CurrentInprogress"
, e);
}
if (Log.IsDebugEnabled())
{
Log.Debug("Updated data[" + content + "] to CurrentInprogress");
}
}
/// <summary>
/// Read the CurrentInprogress node data from Zookeeper and also get the znode
/// version number.
/// </summary>
/// <remarks>
/// Read the CurrentInprogress node data from Zookeeper and also get the znode
/// version number. Return the 3rd field from the data. i.e saved path with
/// #update api
/// </remarks>
/// <returns>available inprogress node path. returns null if not available.</returns>
/// <exception cref="System.IO.IOException"/>
internal virtual string Read()
{
Stat stat = new Stat();
byte[] data = null;
try
{
data = zkc.GetData(this.currentInprogressNode, false, stat);
}
catch (KeeperException e)
{
throw new IOException("Exception while reading the data from " + currentInprogressNode
, e);
}
catch (Exception e)
{
throw new IOException("Interrupted while reading data from " + currentInprogressNode
, e);
}
this.versionNumberForPermission = stat.GetVersion();
if (data != null)
{
BKJournalProtos.CurrentInprogressProto.Builder builder = BKJournalProtos.CurrentInprogressProto
.NewBuilder();
TextFormat.Merge(new string(data, Charsets.Utf8), builder);
if (!builder.IsInitialized())
{
throw new IOException("Invalid/Incomplete data in znode");
}
return(((BKJournalProtos.CurrentInprogressProto)builder.Build()).GetPath());
}
else
{
Log.Debug("No data available in CurrentInprogress");
}
return(null);
}
