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package org.openslx.thrifthelper;
import java.io.IOException;
import java.lang.reflect.Proxy;
import java.net.InetSocketAddress;
import java.net.Socket;
import javax.net.SocketFactory;
import javax.net.ssl.SSLContext;
import org.apache.log4j.Logger;
import org.apache.thrift.TServiceClient;
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.TTransportException;
import org.openslx.bwlp.thrift.iface.MasterServer;
import org.openslx.bwlp.thrift.iface.SatelliteServer;
import org.openslx.thrifthelper.ThriftHandler.WantClientCallback;
import org.openslx.util.Util;
public class ThriftManager<T>
{
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 final T client;
@SuppressWarnings( "unchecked" )
private ThriftManager( Class<T> ifClazz, Class<? extends TServiceClient> clientClazz,
WantClientCallback<? extends TServiceClient> internalCallback, ErrorCallback errorCb )
{
this.client = (T)Proxy.newProxyInstance(
ifClazz.getClassLoader(),
new Class[] { ifClazz }, new ThriftHandler<TServiceClient>(
clientClazz, internalCallback, errorCb ) );
}
private static ThriftManager<MasterServer.Iface> masterManager = null;
private static ThriftManager<SatelliteServer.Iface> satelliteManager = null;
private static ErrorCallback satErrorCallback = null;
private static ErrorCallback masterErrorCallback = null;
/**
* 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 synchronized boolean setMasterServerAddress( final SSLContext ctx, final String host, final int port, final int timeout )
{
if ( masterManager != null ) {
LOGGER.error( "Master server address already set." );
return false;
}
if ( host.isEmpty() ) {
LOGGER.error( "Given address is empty." );
return false;
}
// finally set it
masterManager = new ThriftManager<MasterServer.Iface>( MasterServer.Iface.class, MasterServer.Client.class,
new WantClientCallback<MasterServer.Client>() {
@Override
public MasterServer.Client getNewClient()
{
return getNewMasterClient( ctx, host, port, timeout );
}
}, new ErrorCallback() {
@Override
public boolean thriftError( int failCount, String method, Throwable t )
{
return masterErrorCallback != null && masterErrorCallback.thriftError( failCount, method, t );
}
} );
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 synchronized boolean setSatelliteAddress( final SSLContext ctx, final String host, final int port, final int timeout )
{
if ( satelliteManager != null ) {
LOGGER.error( "Satellite server address already set." );
return false;
}
if ( host.isEmpty() ) {
LOGGER.error( "Given address is empty." );
return false;
}
// finally set it
satelliteManager = new ThriftManager<SatelliteServer.Iface>( SatelliteServer.Iface.class, SatelliteServer.Client.class,
new WantClientCallback<SatelliteServer.Client>() {
@Override
public SatelliteServer.Client getNewClient()
{
return getNewSatelliteClient( ctx, host, port, timeout );
}
}, new ErrorCallback() {
@Override
public boolean thriftError( int failCount, String method, Throwable t )
{
return satErrorCallback != null && satErrorCallback.thriftError( failCount, method, t );
}
} );
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()
{
if ( satelliteManager == null ) {
LOGGER.error( "Satellite server adress was not set prior to getting the client. Use setMasterServerAddress(<addr>)." );
return null;
}
return satelliteManager.client;
}
/**
* Returns the singleton client of the master thrift connection
*
* @return the thrift client to the master server
*/
public static MasterServer.Iface getMasterClient()
{
if ( masterManager == null ) {
LOGGER.error( "Master server adress was not set prior to getting the client. Use setMasterServerAddress(<addr>)." );
return null;
}
return masterManager.client;
}
/**
* Set the callback class for errors that occur on one of the
* thrift connections to the master server.
*
* @param cb
*/
public static synchronized void setMasterErrorCallback( ErrorCallback cb )
{
masterErrorCallback = cb;
}
/**
* Set the callback class for errors that occur on one of the
* thrift connections to the satellite server.
*
* @param cb
*/
public static synchronized void setSatelliteErrorCallback( ErrorCallback cb )
{
satErrorCallback = cb;
}
public static MasterServer.Client getNewMasterClient( SSLContext ctx, String address, int port, int timeout )
{
TProtocol protocol = newTransport( ctx, address, port, timeout );
if ( protocol == null )
return null;
return new MasterServer.Client( protocol );
}
public static SatelliteServer.Client getNewSatelliteClient( SSLContext ctx, String address, int port, int timeout )
{
TProtocol protocol = newTransport( ctx, address, port, timeout );
if ( protocol == null )
return null;
return new SatelliteServer.Client( protocol );
}
private static TProtocol newTransport( SSLContext ctx, String host, int port, int timeout )
{
try {
TSocket tsock;
Socket socket = null;
try {
if ( ctx == null ) {
socket = SocketFactory.getDefault().createSocket();
} else {
socket = ctx.getSocketFactory().createSocket();
}
socket.connect( new InetSocketAddress( host, port ), 4000 );
socket.setSoTimeout( timeout );
} catch ( IOException e ) {
if ( socket != null ) {
Util.safeClose( socket );
}
throw new TTransportException( e );
}
tsock = new TSocket( socket );
return new TBinaryProtocol( new TFramedTransport( tsock ) );
} catch ( TTransportException e ) {
LOGGER.error( "Could not open transport to thrift server at " + host + ":" + port, e );
return null;
}
}
}
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