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package org.openslx.thrifthelper;
import java.lang.reflect.Proxy;
import org.apache.log4j.Logger;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.openslx.imagemaster.thrift.iface.ImageServer;
import org.openslx.sat.thrift.iface.Server;
import org.openslx.thrifthelper.ThriftHandler.EventCallback;
public class ThriftManager
{
private final static Logger LOGGER = Logger.getLogger( ThriftManager.class );
public interface ErrorCallback
{
/**
* Called if connecting/reconnecting to the thrift server failed.
*
* @param t the exception that occured last (may be null)
* @param message an optional message describing the circumstances
*/
public void thriftError( Throwable t, String message );
}
private static ErrorCallback _errorCallback = null;
/**
* Private members for master connection information
*/
private static final String MASTERSERVER_ADDRESS = "bwlp-masterserver.ruf.uni-freiburg.de";
private static final int MASTERSERVER_PORT = 9090;
private static final int MASTERSERVER_TIMEOUT = 15000;
/**
* Private members for satellite connection information
*/
private static String SATELLITE_IP = null;
private static final int SATELLITE_PORT = 9090;
private static final int SATELLITE_TIMEOUT = 15000;
/**
* Sat connection. Initialized when we know the sat server IP.
*/
private static Server.Iface _satClient = null;
/**
* Master connection. As its address is known in advance, create the object right away.
*/
private static ImageServer.Iface _masterClient = (ImageServer.Iface)Proxy.newProxyInstance(
ImageServer.Iface.class.getClassLoader(),
new Class[] { ImageServer.Iface.class }, new ThriftHandler<ImageServer.Client>( ImageServer.Client.class, new EventCallback<ImageServer.Client>() {
@Override
public ImageServer.Client getNewClient()
{
// ok lets do it
TTransport transport =
new TFramedTransport( new TSocket( MASTERSERVER_ADDRESS, MASTERSERVER_PORT, MASTERSERVER_TIMEOUT ) );
try {
transport.open();
} catch ( TTransportException e ) {
LOGGER.error( "Could not open transport to thrift's server with IP: " + MASTERSERVER_ADDRESS );
transport.close();
return null;
}
final TProtocol protocol = new TBinaryProtocol( transport );
// now we are ready to create the client, according to ClientType!
return new ImageServer.Client( protocol );
}
@Override
public void error( Throwable t, String message )
{
synchronized ( LOGGER ) {
if ( _errorCallback != null )
_errorCallback.thriftError( t, message );
}
}
} ) );
/**
* IP Validation Regex
*/
private static final String IP_VALID_PATTERN =
"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
/**
* Sets the IP of the satellite to connect to
*
* @param ip the ip of the satellite as String
* @return true if setting the ip worked, false otherwise
*/
public static boolean setSatellite( String ip )
{
if ( ip.isEmpty() ) {
LOGGER.error( "Given IP for satellite is empty." );
return false;
}
// validate
if ( !ip.matches( IP_VALID_PATTERN ) ) {
LOGGER.error( "Given form of IP is invalid: " + ip );
return false;
}
// finally set it
SATELLITE_IP = ip;
// Create monster proxy class from interface
_satClient = (Server.Iface)Proxy.newProxyInstance(
Server.Iface.class.getClassLoader(),
new Class[] { Server.Iface.class }, new ThriftHandler<Server.Client>( Server.Client.class, new EventCallback<Server.Client>() {
@Override
public Server.Client getNewClient()
{
// first check if we have a sat ip
if ( SATELLITE_IP == null ) {
LOGGER.error( "Satellite ip adress was not set prior to getting the sat client. Use setSatellite(<ip>)." );
return null;
}
// ok lets do it
TTransport transport =
new TSocket( SATELLITE_IP, SATELLITE_PORT, SATELLITE_TIMEOUT );
try {
transport.open();
} catch ( TTransportException e ) {
LOGGER.error( "Could not open transport to thrift's server with IP: " + SATELLITE_IP );
transport.close();
return null;
}
final TProtocol protocol = new TBinaryProtocol( transport );
// now we are ready to create the client, according to ClientType!
LOGGER.info( "Satellite '" + SATELLITE_IP + "' reachable. Client initialised." );
return new Server.Client( protocol );
}
@Override
public void error( Throwable t, String message )
{
synchronized ( LOGGER ) {
if ( _errorCallback != null )
_errorCallback.thriftError( t, message );
}
}
} ) );
return true;
}
/**
* Returns the singleton client of the thrift connection to the satellite
*
* @return the thrift client to the satellite server
*/
public static Server.Iface getSatClient()
{
return _satClient;
}
/**
* Returns the singleton client of the master thrift connection
*
* @return the thrift client to the master server
*/
public static ImageServer.Iface getMasterClient()
{
return _masterClient;
}
/**
* Set the callback class for errors that occur on one of the
* thrift connections.
*
* @param cb
*/
public static void setErrorCallback( ErrorCallback cb )
{
synchronized ( LOGGER ) {
_errorCallback = cb;
}
}
}
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