public void executeCall() throws Exception {
byte returncode;
ObjectInput oin;
// signal the call when constructing
try {
DataOutputStream dout = conn.getDataOutputStream();
dout.write(MESSAGE_CALL);
oout = conn.startObjectOutputStream(); // (re)start ObjectOutputStream
objid.write(oout);
oout.writeInt(opnum);
oout.writeLong(hash);
} catch (IOException ex) {
throw new MarshalException("Try to write header but failed.", ex);
}
try {
releaseOutputStream();
DataInputStream din = conn.getDataInputStream();
if (din.readByte() != MESSAGE_CALL_ACK) throw new RemoteException("Call not acked");
oin = startInputStream();
returncode = oin.readByte();
UID.read(oin);
} catch (IOException ex) {
throw new UnmarshalException("Try to read header but failed:", ex);
}
// check return code
switch (returncode) {
case RETURN_ACK: // it's ok
return;
case RETURN_NACK:
Object returnobj;
try {
returnobj = oin.readObject();
} catch (Exception ex2) {
throw new UnmarshalException("Try to read exception object but failed", ex2);
}
if (!(returnobj instanceof Exception))
throw new UnmarshalException("Should be Exception type here: " + returnobj);
throw (Exception) returnobj;
default:
throw new UnmarshalException("Invalid return code");
}
}
