/* An actor that sends data to a remote consumer.
Copyright (c) 1998-2006 The Regents of the University of California.
All rights reserved.
Permission is hereby granted, without written agreement and without
license or royalty fees, to use, copy, modify, and distribute this
software and its documentation for any purpose, provided that the above
copyright notice and the following two paragraphs appear in all copies
of this software.
IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
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THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
ENHANCEMENTS, OR MODIFICATIONS.
PT_COPYRIGHT_VERSION_2
COPYRIGHTENDKEY
@ProposedRating Yellow (liuj)
@AcceptedRating Yellow (janneck)
*/
package ptolemy.actor.corba;
import java.util.StringTokenizer;
import org.omg.CORBA.ORB;
import org.omg.CORBA.UserException;
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContext;
import org.omg.CosNaming.NamingContextHelper;
import ptolemy.actor.corba.CorbaIOUtil.CorbaIllegalActionException;
import ptolemy.actor.corba.CorbaIOUtil.pushConsumer;
import ptolemy.actor.lib.Sink;
import ptolemy.data.StringToken;
import ptolemy.data.Token;
import ptolemy.data.expr.Parameter;
import ptolemy.kernel.CompositeEntity;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;
//////////////////////////////////////////////////////////////////////////
//// PushSupplier
/**
An actor that send data to a remote consumer.
Specify the ORB initial property with the<i>ORBInitProperties<i>
paremerter, for example:
"-ORBInitialHost xyz.eecs.berkeley.edu -ORBInitialPort 1050"
where "xyz.eecs.berkeley.edu" is the machine runing name server, and
"1050" is the port for name service.
Specify the name of the consumer with <i>ConsumerName<i> that it wants
to send data to.
@author Yang Zhao
@version $Id$
@since Ptolemy II 1.0
*/
public class PushSupplier extends Sink {
/** Construct an actor with the given container and name.
* @param container The container.
* @param name The name of this actor.
* @exception IllegalActionException If the entity cannot be contained
* by the proposed container.
* @exception NameDuplicationException If the container already has an
* actor with this name.
*/
public PushSupplier(CompositeEntity container, String name)
throws NameDuplicationException, IllegalActionException {
super(container, name);
ORBInitProperties = new Parameter(this, "ORBInitProperties");
ORBInitProperties.setToken(new StringToken(""));
remoteConsumerName = new Parameter(this, "remoteConsumerName");
remoteConsumerName.setToken(new StringToken(""));
}
///////////////////////////////////////////////////////////////////
//// ports and parameters ////
/** the ORB initial property. for example:
* "-ORBInitialHost xyz.eecs.berkeley.edu -ORBInitialPort 1050"
*/
public Parameter ORBInitProperties;
/** The name of the remote consumer that this actor wants
* to connect to. The type of the Parameter
* is StringToken.
*/
public Parameter remoteConsumerName;
///////////////////////////////////////////////////////////////////
//// public methods ////
/** Setup the link to the remote consumer. This includes creating
* the ORB, initializing the naming service, and locating the
* remote consumer.
* @exception IllegalActionException If any of the above actions
* failted.
*/
public void initialize() throws IllegalActionException {
super.initialize();
// String tokenize the parameter ORBInitProperties
StringTokenizer st = new StringTokenizer(
((StringToken) ORBInitProperties.getToken()).stringValue());
String[] args = new String[st.countTokens()];
int i = 0;
while (st.hasMoreTokens()) {
args[i] = st.nextToken();
_debug("ORB initial argument: " + args[i]);
i++;
}
_orb = null;
_initORB(args);
_debug("Finished initializing " + getName());
}
/** Read one input token, if there is one, from the input
* and send it to the remote consumer by call the stub method.
* Do nothing if there's no token in the input port.
* @exception IllegalActionException If the publication
* action fails due to network problems, transaction errors,
* or any remote exceptions.
*/
public void fire() throws IllegalActionException {
super.fire();
for (int i = 0; i < input.getWidth(); i++) {
try {
if (input.hasToken(0)) {
Token token = input.get(0);
String data;
if (token instanceof StringToken) {
data = ((StringToken) token).stringValue();
if (_debugging) {
_debug(getName(), "Publisher writes \n" + data);
}
} else {
data = token.toString();
}
org.omg.CORBA.Any event = _orb.create_any();
event.insert_string(data);
_remoteConsumer.push(event);
if (_debugging) {
_debug(getName(), "Publisher writes " + data);
}
}
} catch (CorbaIllegalActionException ex) {
throw new IllegalActionException(this,
"remote actor throws IllegalActionException"
+ ex.getMessage());
}
}
}
///////////////////////////////////////////////////////////////////
//// private methods ////
//use a private method to deal with necessary CORBA operations.
// @exception IllegalActionException If ORB initialize failed.
private void _initORB(String[] args) throws IllegalActionException {
try {
// start the ORB
_orb = ORB.init(args, null);
_debug(getName(), " ORB initialized");
//get the root naming context
org.omg.CORBA.Object objRef = _orb
.resolve_initial_references("NameService");
NamingContext ncRef = NamingContextHelper.narrow(objRef);
if (ncRef != null) {
_debug(getName(), "found name service.");
}
//resolve the remote consumer reference in Naming
NameComponent namecomp = new NameComponent(
((StringToken) remoteConsumerName.getToken()).stringValue(),
"");
_debug(getName(), " looking for name: ", (remoteConsumerName
.getToken()).toString());
NameComponent[] path = { namecomp };
// locate the remote actor
while (!_stopRequested) {
try {
_debug("before try to get remote consumer.");
_remoteConsumer = ptolemy.actor.corba.CorbaIOUtil.pushConsumerHelper
.narrow(ncRef.resolve(path));
_debug("after try to get remote consumer.");
//if (_remoteConsumer instanceof pushConsumer) {
// FIXME: _remoteConsumer is always an
// instance of pushConsumer, so this will
// always break?
_debug("get remote consumer.");
break;
//}
//try {
// Thread.sleep(1000);
//} catch (InterruptedException e) {
// _debug("thread is interrupted when trying to find"
// + "remote consumer");
//}
} catch (Exception exp) {
// ignore here and retry.
_debug("failed to resolve the remote consumer. will try again.");
try {
Thread.sleep(1000);
} catch (InterruptedException ex1) {
_debug("thread is interrupted when trying to find"
+ "remote consumer");
}
}
}
} catch (UserException ex) {
//ex.printStackTrace();
throw new IllegalActionException(
this,
" initialize ORB failed. Please make sure the "
+ "naming server has already started and the "
+ "ORBInitProperty parameter is configured correctly. "
+ "the error message is: " + ex.getMessage());
}
}
///////////////////////////////////////////////////////////////////
//// private methods ////
private ORB _orb;
//the proxy of the remote consumer.
private pushConsumer _remoteConsumer;
}