package org.jboss.errai.bus.server.io;
import static org.slf4j.LoggerFactory.getLogger;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import org.jboss.errai.bus.client.api.base.MessageDeliveryFailure;
import org.jboss.errai.bus.client.api.messaging.Message;
import org.jboss.errai.bus.client.api.messaging.MessageBus;
import org.jboss.errai.bus.client.api.messaging.MessageCallback;
import org.jboss.errai.bus.server.QueueUnavailableException;
import org.jboss.errai.bus.server.api.RpcContext;
import org.slf4j.Logger;
/**
* @author Mike Brock
*/
public abstract class AbstractRPCMethodCallback implements MessageCallback {
private static final Logger log = getLogger(AbstractRPCMethodCallback.class);
protected final ServiceInstanceProvider serviceProvider;
protected final Class[] targetTypes;
protected final Method method;
protected final MessageBus bus;
protected AbstractRPCMethodCallback(final ServiceInstanceProvider genericSvc,
final Method method,
final MessageBus bus) {
this.serviceProvider = genericSvc;
this.targetTypes = (this.method = method).getParameterTypes();
this.bus = bus;
}
public Object invokeMethodFromMessage(Message message) {
final List<Object> parms = message.get(List.class, "MethodParms");
if ((parms == null && targetTypes.length != 0) || (parms.size() != targetTypes.length)) {
throw new MessageDeliveryFailure(
"wrong number of arguments sent to endpoint. (received: "
+ (parms == null ? 0 : parms.size())
+ "; required: " + targetTypes.length + ")");
}
try {
RpcContext.set(message);
return method.invoke(serviceProvider.get(message), parms.toArray(new Object[parms.size()]));
}
catch (QueueUnavailableException e) {
throw e;
}
catch (MessageDeliveryFailure e) {
throw e;
}
catch (InvocationTargetException e) {
log.debug("RPC endpoint threw exception:", e.getCause());
throw new MessageDeliveryFailure("error invoking endpoint", e.getCause(), true);
}
catch (Exception e) {
throw new MessageDeliveryFailure("error invoking endpoint", e);
}
finally {
RpcContext.remove();
}
}
}