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// **********************************************************************
//
// Copyright (c) 2003-2009 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
import Filesystem.*;
import FilesystemDB.*;
public class FileI extends _FileDisp
{
public
FileI(Ice.Communicator communicator, String envName)
{
_communicator = communicator;
_envName = envName;
}
public String
name(Ice.Current c)
{
Freeze.Connection connection = Freeze.Util.createConnection(_communicator, _envName);
try
{
IdentityFileEntryMap fileDB = new IdentityFileEntryMap(connection, filesDB());
for(;;)
{
try
{
FileEntry entry = fileDB.get(c.id);
if(entry == null)
{
throw new Ice.ObjectNotExistException();
}
return entry.name;
}
catch(Freeze.DeadlockException ex)
{
continue;
}
catch(Freeze.DatabaseException ex)
{
halt(ex);
}
}
}
finally
{
connection.close();
}
}
public String[]
read(Ice.Current c)
{
Freeze.Connection connection = Freeze.Util.createConnection(_communicator, _envName);
try
{
IdentityFileEntryMap fileDB = new IdentityFileEntryMap(connection, filesDB());
for(;;)
{
try
{
FileEntry entry = fileDB.get(c.id);
if(entry == null)
{
throw new Ice.ObjectNotExistException();
}
return entry.text;
}
catch(Freeze.DeadlockException ex)
{
continue;
}
catch(Freeze.DatabaseException ex)
{
halt(ex);
}
}
}
finally
{
connection.close();
}
}
public void
write(String[] text, Ice.Current c)
throws GenericError
{
Freeze.Connection connection = Freeze.Util.createConnection(_communicator, _envName);
try
{
IdentityFileEntryMap fileDB = new IdentityFileEntryMap(connection, filesDB());
for(;;)
{
try
{
FileEntry entry = fileDB.get(c.id);
if(entry == null)
{
throw new Ice.ObjectNotExistException();
}
entry.text = text;
fileDB.put(c.id, entry);
break;
}
catch(Freeze.DeadlockException ex)
{
continue;
}
catch(Freeze.DatabaseException ex)
{
halt(ex);
}
}
}
finally
{
connection.close();
}
}
public void
destroy(Ice.Current c)
throws PermissionDenied
{
Freeze.Connection connection = Freeze.Util.createConnection(_communicator, _envName);
try
{
IdentityFileEntryMap fileDB = new IdentityFileEntryMap(connection, filesDB());
IdentityDirectoryEntryMap dirDB = new IdentityDirectoryEntryMap(connection, DirectoryI.directoriesDB());
for(;;)
{
Freeze.Transaction txn = null;
try
{
//
// The transaction is necessary since we are
// altering two records in one atomic action.
//
txn = connection.beginTransaction();
FileEntry entry = fileDB.get(c.id);
if(entry == null)
{
throw new Ice.ObjectNotExistException();
}
DirectoryEntry dirEntry = (DirectoryEntry)dirDB.get(entry.parent);
if(dirEntry == null)
{
halt(new Freeze.DatabaseException("consistency error: file without parent"));
}
dirEntry.nodes.remove(entry.name);
dirDB.put(entry.parent, dirEntry);
fileDB.remove(c.id);
txn.commit();
txn = null;
break;
}
catch(Freeze.DeadlockException ex)
{
continue;
}
catch(Freeze.DatabaseException ex)
{
halt(ex);
}
finally
{
if(txn != null)
{
txn.rollback();
}
}
}
}
finally
{
connection.close();
}
}
public static String
filesDB()
{
return "files";
}
private void
halt(Freeze.DatabaseException e)
{
//
// If this is called it's very bad news. We log the error and
// then kill the server.
//
java.io.StringWriter sw = new java.io.StringWriter();
java.io.PrintWriter pw = new java.io.PrintWriter(sw);
e.printStackTrace(pw);
pw.flush();
_communicator.getLogger().error("fatal database error\n" + sw.toString() + "\n*** Halting JVM ***");
Runtime.getRuntime().halt(1);
}
private Ice.Communicator _communicator;
private String _envName;
}
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