/// <summary>Read the next key and return the value-stream.</summary>
/// <param name="key"/>
/// <returns>the valueStream if there are more keys or null otherwise.</returns>
/// <exception cref="System.IO.IOException"/>
public virtual DataInputStream Next(AggregatedLogFormat.LogKey key)
{
if (!this.atBeginning)
{
this.scanner.Advance();
}
else
{
this.atBeginning = false;
}
if (this.scanner.AtEnd())
{
return(null);
}
TFile.Reader.Scanner.Entry entry = this.scanner.Entry();
key.ReadFields(entry.GetKeyStream());
// Skip META keys
if (ReservedKeys.Contains(key.ToString()))
{
return(Next(key));
}
DataInputStream valueStream = entry.GetValueStream();
return(valueStream);
}
/// <exception cref="System.IO.IOException"/>
public virtual FileSystemApplicationHistoryStore.HistoryFileReader.Entry Next()
{
TFile.Reader.Scanner.Entry entry = this.scanner.Entry();
DataInputStream dis = entry.GetKeyStream();
FileSystemApplicationHistoryStore.HistoryDataKey key = new FileSystemApplicationHistoryStore.HistoryDataKey
();
key.ReadFields(dis);
dis = entry.GetValueStream();
byte[] value = new byte[entry.GetValueLength()];
dis.Read(value);
this.scanner.Advance();
return(new FileSystemApplicationHistoryStore.HistoryFileReader.Entry(this, key, value
));
}
/// <summary>Returns the owner of the application.</summary>
/// <returns>the application owner.</returns>
/// <exception cref="System.IO.IOException"/>
public virtual string GetApplicationOwner()
{
TFile.Reader.Scanner ownerScanner = reader.CreateScanner();
AggregatedLogFormat.LogKey key = new AggregatedLogFormat.LogKey();
while (!ownerScanner.AtEnd())
{
TFile.Reader.Scanner.Entry entry = ownerScanner.Entry();
key.ReadFields(entry.GetKeyStream());
if (key.ToString().Equals(ApplicationOwnerKey.ToString()))
{
DataInputStream valueStream = entry.GetValueStream();
return(valueStream.ReadUTF());
}
ownerScanner.Advance();
}
return(null);
}
/// <summary>Returns ACLs for the application.</summary>
/// <remarks>
/// Returns ACLs for the application. An empty map is returned if no ACLs are
/// found.
/// </remarks>
/// <returns>a map of the Application ACLs.</returns>
/// <exception cref="System.IO.IOException"/>
public virtual IDictionary <ApplicationAccessType, string> GetApplicationAcls()
{
// TODO Seek directly to the key once a comparator is specified.
TFile.Reader.Scanner aclScanner = reader.CreateScanner();
AggregatedLogFormat.LogKey key = new AggregatedLogFormat.LogKey();
IDictionary <ApplicationAccessType, string> acls = new Dictionary <ApplicationAccessType
, string>();
while (!aclScanner.AtEnd())
{
TFile.Reader.Scanner.Entry entry = aclScanner.Entry();
key.ReadFields(entry.GetKeyStream());
if (key.ToString().Equals(ApplicationAclKey.ToString()))
{
DataInputStream valueStream = entry.GetValueStream();
while (true)
{
string appAccessOp = null;
string aclString = null;
try
{
appAccessOp = valueStream.ReadUTF();
}
catch (EOFException)
{
// Valid end of stream.
break;
}
try
{
aclString = valueStream.ReadUTF();
}
catch (EOFException e)
{
throw new YarnRuntimeException("Error reading ACLs", e);
}
acls[ApplicationAccessType.ValueOf(appAccessOp)] = aclString;
}
}
aclScanner.Advance();
}
return(acls);
}