| /* |
| * 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.commons.lang3.ClassUtils; |
| 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.apache.karaf.cellar.core.exception.RemoteServiceInvocationException; |
| 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; |
| import java.util.Arrays; |
| |
| /** |
| * 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(); |
| } |
| } |
| |
| RemoteServiceResult result = new RemoteServiceResult(event.getId()); |
| EventProducer producer = eventTransportFactory.getEventProducer(Constants.RESULT_PREFIX + Constants.SEPARATOR + event.getSourceNode().getId() + event.getEndpointId(), false); |
| try { |
| Method method = getMethod(classes, targetService, event); |
| Object obj = method.invoke(targetService, event.getArguments().toArray()); |
| result.setResult(obj); |
| producer.produce(result); |
| |
| } catch (NoSuchMethodException e) { |
| LOGGER.error("CELLAR DOSGI: unable to find remote method for service", e); |
| result.setResult(new RemoteServiceInvocationException(e)); |
| producer.produce(result); |
| } catch (InvocationTargetException e) { |
| LOGGER.error("CELLAR DOSGI: unable to invoke remote method for service", e); |
| result.setResult(new RemoteServiceInvocationException(e.getCause())); |
| producer.produce(result); |
| } catch (IllegalAccessException e) { |
| LOGGER.error("CELLAR DOSGI: unable to access remote method for service", e); |
| result.setResult(new RemoteServiceInvocationException(e)); |
| producer.produce(result); |
| } |
| } |
| } |
| } |
| |
| /** |
| * <p>Gets a matching method in the <code>Object targetService<code/>.<br/> |
| * Inheritance is supported.</p> |
| * |
| * @param eventParamTypes |
| * @param targetService |
| * @param event |
| * @return a method instance from the <code>Object targetService<code/> |
| * @throws NoSuchMethodException |
| */ |
| private Method getMethod(Class[] eventParamTypes, Object targetService, RemoteServiceCall event) throws NoSuchMethodException { |
| |
| Method result = null; |
| if (eventParamTypes.length > 0) { |
| for (Method remoteMethod : targetService.getClass().getMethods()) { |
| //need to find a method with a matching name and with the same number of parameters |
| if (remoteMethod.getName().equals(event.getMethod()) && remoteMethod.getParameterTypes().length == eventParamTypes.length) { |
| boolean allParamsFound = true; |
| for (int i = 0; i < remoteMethod.getParameterTypes().length; i++) { |
| allParamsFound = allParamsFound && ClassUtils.isAssignable(eventParamTypes[i], remoteMethod.getParameterTypes()[i]); |
| } |
| |
| // if already found a matching method, no need to continue looking for one |
| if (allParamsFound) { |
| result = remoteMethod; |
| break; |
| } |
| } |
| } |
| } else { |
| result = targetService.getClass().getMethod(event.getMethod()); |
| } |
| |
| //if method was not found go out with a bang |
| if (result == null) { |
| throw new NoSuchMethodException(String.format("No match for method [%s] %s", event.getMethod(), Arrays.toString(eventParamTypes))); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Get the event type that this handler can handle. |
| * |
| * @return the remote service call event type. |
| */ |
| @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; |
| } |
| |
| } |