Cast error while accessing related elements

[manuelleduc]

Using this model :

with version "6.0.0-SNAPSHOT"
class org.kevoree.Instance extends org.kevoree.Element {
    with instantiation "false"
    att name: String with index
}

class org.kevoree.Channel extends org.kevoree.Instance {
    rel outputs: org.kevoree.OutputPort with opposite "channels"
}

class org.kevoree.Component extends org.kevoree.Instance {
    rel outputs: org.kevoree.OutputPort with opposite "channels"
}

class org.kevoree.Port extends org.kevoree.Element {
    att name: String with index
    rel channels: org.kevoree.Channel with opposite "outputs"
}

class org.kevoree.OutputPort extends org.kevoree.Port {
}

I wrote this code which instanciate a Component, add it an OutputPort and then tries to retrieve the OutputPort from the Component :

import org.KevoreeModel;
import org.junit.Test;
import org.kevoree.*;
import org.kevoree.modeling.KCallback;
import org.kevoree.modeling.memory.manager.DataManagerBuilder;
import org.kevoree.modeling.scheduler.impl.DirectScheduler;

public class BugTest {

    @Test
    public void test() throws Exception {
        final KevoreeModel tm = new KevoreeModel(DataManagerBuilder.create().withScheduler(new DirectScheduler()).build());
        tm.connect(new KCallback() {
            @Override
            public void on(Object cb) {
                final Component component1 = tm.createComponent(0, 0);
                component1.setName("comp0");
                final OutputPort outputPort = tm.createOutputPort(0, 0);
                component1.addOutputs(outputPort);
                outputPort.getChannels(new KCallback<Channel[]>() {
                    @Override
                    public void on(Channel[] channels) {
                        for (Channel channel : channels) {
                            System.out.println("Channel : " + channel.getName());
                        }
                    }
                });
            }
        });
    }
}

The resulting error is :

java.lang.ClassCastException: org.kevoree.impl.ComponentImpl cannot be cast to org.kevoree.Channel
    at org.kevoree.impl.OutputPortImpl$1.on(OutputPortImpl.java:46)
    at org.kevoree.impl.OutputPortImpl$1.on(OutputPortImpl.java:41)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1$1$1$1.on(DistortedTimeResolver.java:180)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1$1$1$1.on(DistortedTimeResolver.java:162)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver.getOrLoadAndMarkAll(DistortedTimeResolver.java:688)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1$1$1.on(DistortedTimeResolver.java:162)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1$1$1.on(DistortedTimeResolver.java:142)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver.getOrLoadAndMarkAll(DistortedTimeResolver.java:688)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1$1.on(DistortedTimeResolver.java:142)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1$1.on(DistortedTimeResolver.java:127)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver.getOrLoadAndMarkAll(DistortedTimeResolver.java:688)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1.on(DistortedTimeResolver.java:127)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2$1.on(DistortedTimeResolver.java:117)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver.getOrLoadAndMark(DistortedTimeResolver.java:657)
    at org.kevoree.modeling.memory.resolver.impl.DistortedTimeResolver$2.run(DistortedTimeResolver.java:117)
    at org.kevoree.modeling.scheduler.impl.DirectScheduler.dispatch(DirectScheduler.java:10)
    at org.kevoree.modeling.memory.manager.impl.DataManager.lookupAllObjects(DataManager.java:328)
    at org.kevoree.modeling.abs.AbstractKObject.internal_getRelation(AbstractKObject.java:364)
    at org.kevoree.modeling.abs.AbstractKObject.getRelation(AbstractKObject.java:351)
    at org.kevoree.impl.OutputPortImpl.getChannels(OutputPortImpl.java:41)
    at BugTest$1.on(BugTest.java:20)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2$1$1$1.on(DataManager.java:271)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2$1$1$1.on(DataManager.java:239)
    at org.kevoree.modeling.cdn.impl.MemoryContentDeliveryDriver.get(MemoryContentDeliveryDriver.java:54)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2$1$1.on(DataManager.java:239)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2$1$1.on(DataManager.java:230)
    at org.kevoree.modeling.cdn.impl.MemoryContentDeliveryDriver.atomicGetIncrement(MemoryContentDeliveryDriver.java:43)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2$1.on(DataManager.java:229)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2$1.on(DataManager.java:216)
    at org.kevoree.modeling.cdn.impl.MemoryContentDeliveryDriver.connect(MemoryContentDeliveryDriver.java:93)
    at org.kevoree.modeling.memory.manager.impl.DataManager$2.run(DataManager.java:216)
    at org.kevoree.modeling.scheduler.impl.DirectScheduler.dispatch(DirectScheduler.java:10)
    at org.kevoree.modeling.memory.manager.impl.DataManager.connect(DataManager.java:213)
    at org.kevoree.modeling.abs.AbstractKModel.connect(AbstractKModel.java:34)
    at BugTest.test(BugTest.java:13)
    [...]

[lmouline]

This is due to the opposite keyword. You use it in a strange way.
Take only the following lines :

class org.kevoree.Component extends org.kevoree.Instance {
    rel outputs: org.kevoree.OutputPort with opposite "channels"
}

class org.kevoree.Port extends org.kevoree.Element {
    rel channels: org.kevoree.Channel with opposite "outputs"
}

In my point of view, this cannot function. Because you try to declare a bi-directionnal relation that is between a Component and an Port on a way (Component.outputs), and on the other way between a Port and a Channel (Port.channels). Moreover, Channel and Component have not "hierarchical relation".

May be in the Port class you should have two elements 9one for the Channel and one for the Component) or create the relation with Instance.

I don't know if I am really clear. But, if you want I draw you a schema that shows that what your are trying to do is impossible (In my point of view)