Sub Activity_Click
Dim s As Socket
s.Initialize("S")
Dim r As Reflector
r.Target = s
Dim socket As JavaObject = r.GetField("socket")
Dim jo As JavaObject = Me
jo.RunMethod("setKeepaliveSocketOptions", Array(socket, 1000, 1000, 3))
End Sub
#if Java
import java.io.FileDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.Socket;
private final static int SOL_TCP = 6;
private final static int TCP_KEEPIDLE = 4;
private final static int TCP_KEEPINTVL = 5;
private final static int TCP_KEEPCNT = 6;
public static void setKeepaliveSocketOptions(Socket socket, int idleTimeout, int interval, int count) throws Exception{
socket.setKeepAlive(true);
Field socketImplField = Class.forName("java.net.Socket").getDeclaredField("impl");
socketImplField.setAccessible(true);
if(socketImplField != null) {
Object plainSocketImpl = socketImplField.get(socket);
Field fileDescriptorField = Class.forName("java.net.SocketImpl").getDeclaredField("fd");
if(fileDescriptorField != null) {
fileDescriptorField.setAccessible(true);
FileDescriptor fileDescriptor = (FileDescriptor)fileDescriptorField.get(plainSocketImpl);
Class libCoreClass = Class.forName("libcore.io.Libcore");
Field osField = libCoreClass.getDeclaredField("os");
osField.setAccessible(true);
Object libcoreOs = osField.get(libCoreClass);
Method setSocketOptsMethod = Class.forName("libcore.io.ForwardingOs").getDeclaredMethod("setsockoptInt", FileDescriptor.class, int.class, int.class, int.class);
if(setSocketOptsMethod != null) {
setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPIDLE, idleTimeout);
setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPINTVL, interval);
setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPCNT, count);
}
}
}
}
#End If
