/*
* Copyright 2008-2014 the original author or authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.kaleidofoundry.messaging;
import static org.kaleidofoundry.messaging.ClientContextBuilder.TRANSPORT_REF;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Set;
import org.kaleidofoundry.core.context.AbstractProviderService;
import org.kaleidofoundry.core.context.EmptyContextParameterException;
import org.kaleidofoundry.core.context.ProviderException;
import org.kaleidofoundry.core.context.RuntimeContext;
import org.kaleidofoundry.core.plugin.Declare;
import org.kaleidofoundry.core.plugin.PluginFactory;
import org.kaleidofoundry.core.plugin.model.Plugin;
import org.kaleidofoundry.core.util.Registry;
import org.kaleidofoundry.core.util.StringHelper;
import org.kaleidofoundry.messaging.jms.JmsConsumer;
/**
* @author jraduget
*/
public class ConsumerProvider extends AbstractProviderService<Consumer> {
static final Registry<String, Consumer> REGISTRY = new Registry<String, Consumer>();
public ConsumerProvider(Class<Consumer> genericClassInterface) {
super(genericClassInterface);
}
@Override
protected Registry<String, Consumer> getRegistry() {
return REGISTRY;
}
public Consumer provides(String name) {
return _provides(name, null);
}
public Consumer provides(String name, RuntimeContext<?> context) {
Consumer consumer = getRegistry().get(name);
if (consumer != null) {
return consumer;
} else {
return provides(new RuntimeContext<Consumer>(name, Consumer.class, context));
}
}
@Override
protected Consumer _provides(RuntimeContext<Consumer> context) throws ProviderException {
return _provides(context.getName(), context);
}
protected Consumer _provides(String name, RuntimeContext<Consumer> context) throws ProviderException {
// consumer transport
String transportRef = context.getString(TRANSPORT_REF);
Transport transport;
if (!StringHelper.isEmpty(transportRef)) {
transport = TransportFactory.provides(transportRef, context);
} else {
throw new EmptyContextParameterException(TRANSPORT_REF, context);
}
String type = transport.getProviderCode();
// only for optimization reasons
if (type.equalsIgnoreCase(TransportProviderEnum.jms.name())) { return new JmsConsumer(context); }
// dynamic lookup into register plugin
final Set<Plugin<Consumer>> pluginImpls = PluginFactory.getImplementationRegistry().findByInterface(Consumer.class);
// scan each @Declare file store implementation, to get one which handle the given implementation code
for (final Plugin<Consumer> pi : pluginImpls) {
final Class<? extends Consumer> impl = pi.getAnnotatedClass();
try {
final Declare declarePlugin = impl.getAnnotation(Declare.class);
if (declarePlugin.value().endsWith(type)) {
final Constructor<? extends Consumer> constructor = impl.getConstructor(RuntimeContext.class);
return constructor.newInstance(context);
}
} catch (final NoSuchMethodException e) {
throw new ProviderException("context.provider.error.NoSuchConstructorException", impl.getName(), "RuntimeContext<Consumer> context");
} catch (final InstantiationException e) {
throw new ProviderException("context.provider.error.InstantiationException", impl.getName(), e.getMessage());
} catch (final IllegalAccessException e) {
throw new ProviderException("context.provider.error.IllegalAccessException", impl.getName(), "RuntimeContext<Consumer> context");
} catch (final InvocationTargetException e) {
throw new ProviderException("context.provider.error.InvocationTargetException", e.getCause(), impl.getName(), "RuntimeContext<Consumer> context", e
.getCause().getClass().getName(), e.getMessage());
}
}
throw new ProviderException(new TransportException("messaging.consumer.provider.illegal", transport.getProviderCode()));
}
/**
* Stop / destroy all consumers
*
* @throws TransportException
*/
public void stopAll() throws TransportException {
for (Consumer consumer : REGISTRY.values()) {
consumer.stop();
}
}
}