/**
* Executes the desired method call with a new instance of the {@link ResourceServlet}
* implementation. Transaction management is done here.
*
* @param call
* @param uow
* @param req
* @param resp
*/
private final void dispatch(
Method call, UnitOfWork uow, HttpServletRequest req, HttpServletResponse resp) {
if (uow == null) {
try {
ResourceServlet servlet = GuiceBundle.getInjector().getInstance(servletClass);
call.invoke(servlet, req, resp);
} catch (Exception e) {
throw new RuntimeException(e);
}
} else {
SessionFactory sessionFactory = GuiceBundle.getInjector().getInstance(SessionFactory.class);
Session session = sessionFactory.openSession();
try {
configureSession(session, uow);
ManagedSessionContext.bind(session);
beginTransaction(session, uow);
try {
ResourceServlet servlet =
(singleton == null) ? singleton : GuiceBundle.getInjector().getInstance(servletClass);
call.invoke(servlet, req, resp);
commitTransaction(session, uow);
} catch (Exception e) {
rollbackTransaction(session, uow);
throw new RuntimeException(e);
}
} finally {
session.close();
ManagedSessionContext.unbind(sessionFactory);
}
}
}
/**
* Contstructor to get
*
* @param servletClass {@link ResourceServlet} implementation class and cache all methods and
* {@link io.dropwizard.hibernate.UnitOfWork} annotations of methods.
* @throws NoSuchMethodException
*/
public WrapperServlet(Class<ResourceServlet> servletClass, boolean singleInstance)
throws NoSuchMethodException {
this.servletClass = servletClass;
this.singleton = null;
try {
if (singleInstance) singleton = GuiceBundle.getInjector().getInstance(servletClass);
doGet = servletClass.getMethod("doGet", HttpServletRequest.class, HttpServletResponse.class);
doPut = servletClass.getMethod("doPut", HttpServletRequest.class, HttpServletResponse.class);
doPost =
servletClass.getMethod("doPost", HttpServletRequest.class, HttpServletResponse.class);
doDelete =
servletClass.getMethod("doDelete", HttpServletRequest.class, HttpServletResponse.class);
doOptions =
servletClass.getMethod("doOptions", HttpServletRequest.class, HttpServletResponse.class);
doHead =
servletClass.getMethod("doHead", HttpServletRequest.class, HttpServletResponse.class);
doTrace =
servletClass.getMethod("doTrace", HttpServletRequest.class, HttpServletResponse.class);
uowDoGet = doGet.getAnnotation(UnitOfWork.class);
uowDoPut = doPut.getAnnotation(UnitOfWork.class);
uowDoPost = doPost.getAnnotation(UnitOfWork.class);
uowDoDelete = doDelete.getAnnotation(UnitOfWork.class);
uowDoOptions = doOptions.getAnnotation(UnitOfWork.class);
uowDoHead = doHead.getAnnotation(UnitOfWork.class);
uowDoTrace = doTrace.getAnnotation(UnitOfWork.class);
} catch (NoSuchMethodException e) {
throw e; // Never
}
}
