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Fabric3 Java Component Implementation.
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/*
* Fabric3
* Copyright (c) 2009-2011 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
* If not, see .
*/
package org.fabric3.implementation.java.runtime;

import java.lang.reflect.Method;
import java.net.URI;

import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Reference;

import org.fabric3.implementation.java.provision.JavaConnectionTargetDefinition;
import org.fabric3.implementation.pojo.component.InvokerEventStreamHandler;
import org.fabric3.spi.builder.component.ConnectionAttachException;
import org.fabric3.spi.builder.component.TargetConnectionAttacher;
import org.fabric3.spi.channel.ChannelConnection;
import org.fabric3.spi.channel.EventStream;
import org.fabric3.spi.classloader.ClassLoaderRegistry;
import org.fabric3.spi.cm.ComponentManager;
import org.fabric3.spi.model.physical.PhysicalConnectionSourceDefinition;
import org.fabric3.spi.model.type.java.Signature;
import org.fabric3.spi.util.UriHelper;

/**
 * Attaches and detaches a {@link ChannelConnection} from a Java component consumer.
 *
 * @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
 */
@EagerInit
public class JavaTargetConnectionAttacher implements TargetConnectionAttacher {
    private ComponentManager manager;
    private ClassLoaderRegistry classLoaderRegistry;

    public JavaTargetConnectionAttacher(@Reference ComponentManager manager, @Reference ClassLoaderRegistry classLoaderRegistry) {
        this.manager = manager;
        this.classLoaderRegistry = classLoaderRegistry;
    }

    public void attach(PhysicalConnectionSourceDefinition source, JavaConnectionTargetDefinition target, ChannelConnection connection)
            throws ConnectionAttachException {
        URI targetUri = target.getTargetUri();
        URI targetName = UriHelper.getDefragmentedName(targetUri);
        JavaComponent component = (JavaComponent) manager.getComponent(targetName);
        if (component == null) {
            throw new ConnectionAttachException("Target component not found: " + targetName);
        }
        ClassLoader loader = classLoaderRegistry.getClassLoader(target.getClassLoaderId());
        Method method = loadMethod(target, component);
        InvokerEventStreamHandler handler = new InvokerEventStreamHandler(method, component, component.getScopeContainer(), loader);
        for (EventStream stream : connection.getEventStreams()) {
            stream.addHandler(handler);
        }
    }

    public void detach(PhysicalConnectionSourceDefinition source, JavaConnectionTargetDefinition target) throws ConnectionAttachException {
        // no-op
    }

    private Method loadMethod(JavaConnectionTargetDefinition target, JavaComponent component) throws ConnectionAttachException {
        Signature signature = target.getConsumerSignature();
        Class implementationClass = component.getImplementationClass();
        try {
            return signature.getMethod(implementationClass);
        } catch (ClassNotFoundException e) {
            throw new ConnectionAttachException(e);
        } catch (NoSuchMethodException e) {
            throw new ConnectionAttachException(e);
        }
    }

}