/*
* 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.apache.karaf.cellar.dosgi;
import org.apache.karaf.cellar.core.CellarSupport;
import org.apache.karaf.cellar.core.Configurations;
import org.apache.karaf.cellar.core.control.BasicSwitch;
import org.apache.karaf.cellar.core.control.Switch;
import org.apache.karaf.cellar.core.control.SwitchStatus;
import org.apache.karaf.cellar.core.event.EventHandler;
import org.apache.karaf.cellar.core.event.EventProducer;
import org.apache.karaf.cellar.core.event.EventTransportFactory;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.service.cm.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Handler for cluster remote service call event.
*/
public class RemoteServiceCallHandler extends CellarSupport implements EventHandler<RemoteServiceCall> {
private static final transient Logger LOGGER = LoggerFactory.getLogger(RemoteServiceCallHandler.class);
public static final String SWITCH_ID = "org.apache.karaf.cellar.dosgi.switch";
private final Switch dosgiSwitch = new BasicSwitch(SWITCH_ID);
private BundleContext bundleContext;
private EventTransportFactory eventTransportFactory;
@Override
public void handle(RemoteServiceCall event) {
// check if the handler switch is ON
if (this.getSwitch().getStatus().equals(SwitchStatus.OFF)) {
LOGGER.debug("CELLAR DOSGI: {} switch is OFF, cluster event is not handled", SWITCH_ID);
return;
}
Object targetService = null;
if (event != null) {
ServiceReference[] serviceReferences = null;
try {
serviceReferences = bundleContext.getServiceReferences(event.getServiceClass(), null);
if (serviceReferences != null && serviceReferences.length > 0) {
targetService = bundleContext.getService(serviceReferences[0]);
bundleContext.ungetService(serviceReferences[0]);
}
} catch (InvalidSyntaxException e) {
LOGGER.error("CELLAR DOSGI: unable to lookup service", e);
}
if (targetService != null) {
Class[] classes = new Class[0];
if (event.getArguments() != null && event.getArguments().size() > 0) {
classes = new Class[event.getArguments().size()];
int i = 0;
for (Object obj : event.getArguments()) {
classes[i++] = obj.getClass();
}
}
try {
Method method;
if (classes.length > 0) {
method = targetService.getClass().getMethod(event.getMethod(), classes);
} else {
method = targetService.getClass().getMethod(event.getMethod());
}
Object obj = method.invoke(targetService, event.getArguments().toArray());
RemoteServiceResult result = new RemoteServiceResult(event.getId());
result.setResult(obj);
EventProducer producer = eventTransportFactory.getEventProducer(Constants.RESULT_PREFIX + Constants.SEPARATOR + event.getSourceNode().getId() + event.getEndpointId(), false);
producer.produce(result);
} catch (NoSuchMethodException e) {
LOGGER.error("CELLAR DOSGI: unable to find remote method for service", e);
} catch (InvocationTargetException e) {
LOGGER.error("CELLAR DOSGI: unable to invoke remote method for service", e);
} catch (IllegalAccessException e) {
LOGGER.error("CELLAR DOSGI: unable to access remote method for service", e);
}
}
}
}
@Override
public Class<RemoteServiceCall> getType() {
return RemoteServiceCall.class;
}
@Override
public Switch getSwitch() {
// load the switch status from the config
try {
Configuration configuration = configurationAdmin.getConfiguration(Configurations.NODE);
if (configuration != null) {
Boolean status = new Boolean((String) configuration.getProperties().get(Configurations.HANDLER + "." + this.getClass().getName()));
if (status) {
dosgiSwitch.turnOn();
} else {
dosgiSwitch.turnOff();
}
}
} catch (Exception e) {
// ignore
}
return dosgiSwitch;
}
public BundleContext getBundleContext() {
return bundleContext;
}
public void setBundleContext(BundleContext bundleContext) {
this.bundleContext = bundleContext;
}
public EventTransportFactory getEventTransportFactory() {
return eventTransportFactory;
}
public void setEventTransportFactory(EventTransportFactory eventTransportFactory) {
this.eventTransportFactory = eventTransportFactory;
}
}