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.bwlp.thrift.iface.MasterServer;
import org.openslx.bwlp.thrift.iface.SatelliteServer;
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 failCount how many failures occured for this call so far
* @param method name of method that failed
* @param t the exception that occured (may be null)
* @return true if we should retry, false otherwise
*/
public boolean thriftError( int failCount, String method, Throwable t );
}
private static ErrorCallback errorCallback = null;
/**
* Private members for master connection information
*/
private static String MASTERSERVER_ADDRESS = null;
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 SatelliteServer.Iface satClient = (SatelliteServer.Iface)Proxy.newProxyInstance(
SatelliteServer.Iface.class.getClassLoader(),
new Class[] { SatelliteServer.Iface.class }, new ThriftHandler<SatelliteServer.Client>( SatelliteServer.Client.class, new EventCallback<SatelliteServer.Client>() {
@Override
public SatelliteServer.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 setSatelliteAddress(<addr>)." );
return null;
}
// ok lets do it
TTransport transport = new TFramedTransport( 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 SatelliteServer.Client( protocol );
}
@Override
public boolean error( int failCount, String method, Throwable t )
{
return errorCallback != null && errorCallback.thriftError( failCount, method, t );
}
} ) );
/**
* Master connection. As its address is known in advance, create the object right away.
*/
private static MasterServer.Iface masterClient = (MasterServer.Iface)Proxy.newProxyInstance(
MasterServer.Iface.class.getClassLoader(),
new Class[] { MasterServer.Iface.class }, new ThriftHandler<MasterServer.Client>( MasterServer.Client.class, new EventCallback<MasterServer.Client>() {
@Override
public MasterServer.Client getNewClient()
{
// first check if we have a sat ip
if ( MASTERSERVER_ADDRESS == null ) {
LOGGER.error( "Master server adress was not set prior to getting the client. Use setMasterServerAddress(<addr>)." );
return null;
}
// 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 MasterServer.Client( protocol );
}
@Override
public boolean error( int failCount, String method, Throwable t )
{
return errorCallback != null && errorCallback.thriftError( failCount, method, t );
}
} ) );
/**
* Sets the address of the master server
*
* @param host the ip/hostname of the master server
* @return true if setting the address worked, false otherwise
*/
public static boolean setMasterServerAddress( String host )
{
if ( MASTERSERVER_ADDRESS != null ) {
LOGGER.error( "Master server address already set." );
return false;
}
if ( host.isEmpty() ) {
LOGGER.error( "Given address is empty." );
return false;
}
// finally set it
MASTERSERVER_ADDRESS = host;
return true;
}
/**
* Sets the IP of the satellite to connect to
*
* @param host the ip/hostname of the satellite
* @return true if setting the address worked, false otherwise
*/
public static boolean setSatelliteAddress( String host )
{
if ( SATELLITE_IP != null ) {
LOGGER.error( "Satellite address already set." );
return false;
}
if ( host.isEmpty() ) {
LOGGER.error( "Given address for satellite is empty." );
return false;
}
// finally set it
SATELLITE_IP = host;
return true;
}
/**
* Returns the singleton client of the thrift connection to the satellite
*
* @return the thrift client to the satellite server
*/
public static SatelliteServer.Iface getSatClient()
{
return satClient;
}
/**
* Returns the singleton client of the master thrift connection
*
* @return the thrift client to the master server
*/
public static MasterServer.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;
}
}
}
