OFBiz: 초기 RequestHandler
15798 단어 handler
public class ControlServlet extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
// configure custom BSF engines
configureBsf();
// initialize the request handler
getRequestHandler();
}
protected RequestHandler getRequestHandler() {
return RequestHandler.getRequestHandler(getServletContext()); }
}
ControlServlet은 RequestHandler에 대한 변수를 정의하지 않고 ServletContext에 배치합니다.서브렛Context 하나에는 RequestHandler 하나만 허용됩니다.
public class RequestHandler {
public static RequestHandler getRequestHandler(ServletContext servletContext) {
RequestHandler rh = (RequestHandler) servletContext.getAttribute("_REQUEST_HANDLER_");
if (rh == null) {
rh = new RequestHandler();
servletContext.setAttribute("_REQUEST_HANDLER_", rh); rh.init(servletContext);
}
return rh;
}
}
RequestHandler의 구조기는 비어 있으며, 초기화는 init () 에 있습니다.
public class RequestHandler {
public void init(ServletContext context) {
this.context = context;
// init the ControllerConfig, but don't save it anywhere
// ControllerConfig,
this.controllerConfigURL = ConfigXMLReader.getControllerConfigURL(context);
ConfigXMLReader.getControllerConfig(this.controllerConfigURL);
this.viewFactory = new ViewFactory(this);
this.eventFactory = new EventFactory(this);
}
}
RequestHandler에 대응하는 설정 파일은 WEB-INF/controller입니다.xml, ConfigXMLReader 처리.OFBiz 처리 controller.xml이 캐시를 사용해서 초과할 때 자동으로 정리됩니다.따라서 OFBiz 클래스에 Controller Config가 필요할 때 변수를 정의하지 않고 controller Config를 저장합니다.ConfigXMLReader가 URL을 Key 캐시 ControllerConfig로 하기 때문에 xml에 대응하는 URL 변수입니다.RequestHandler의 DoRequest() 가져오기 ControllerConfig는 다음과 같이 처리됩니다.
public class RequestHandler {
public void doRequest(HttpServletRequest request, HttpServletResponse response, String chain,
GenericValue userLogin, Delegator delegator) throws RequestHandlerException {
... ...
// get the controllerConfig once for this method so we don't have to get it over and over inside the method
ConfigXMLReader.ControllerConfig controllerConfig = this.getControllerConfig();
Map<String, ConfigXMLReader.RequestMap> requestMapMap = controllerConfig.getRequestMapMap();
... ...
}
public ConfigXMLReader.ControllerConfig getControllerConfig() {
return ConfigXMLReader.getControllerConfig(this.controllerConfigURL);
}
}
RequestHandler에는 ViewFactory 객체와 EventFactory 객체가 포함되어 있습니다.ViewFactory 객체의 초기화는 자체 작성기에 의해 수행됩니다.
public class ViewFactory {
public ViewFactory(RequestHandler requestHandler) {
this.handlers = FastMap.newInstance();
this.requestHandler = requestHandler;
this.context = requestHandler.getServletContext();
// pre-load all the view handlers
try {
this.preLoadAll();
} catch (ViewHandlerException e) {
Debug.logError(e, module);
throw new GeneralRuntimeException(e);
}
}
}
ViewFactory가 시작되었을 때, preLoadAll () 를 호출하여 모든 controller에 불러옵니다.xml에 정의된 ViewHandler입니다.
public class ViewFactory {
private void preLoadAll() throws ViewHandlerException {
Set<String> handlers = this.requestHandler.getControllerConfig().getViewHandlerMap().keySet();
if (handlers != null) {
for (String type: handlers) {
this.handlers.put(type, this.loadViewHandler(type));
}
}
// load the "default" type
if (!this.handlers.containsKey("default")) {
try {
ViewHandler h = (ViewHandler) ObjectType.getInstance("org.ofbiz.webapp.view.JspViewHandler");
h.init(context);
this. handlers.put("default", h);
} catch (Exception e) {
throw new ViewHandlerException(e);
}
}
}
}
loadViewHandler () 는 구체적인 ViewHandler 초기화를 실행합니다.
public class ViewFactory {
private ViewHandler loadViewHandler(String type) throws ViewHandlerException {
ViewHandler handler = null;
String handlerClass = this.requestHandler.getControllerConfig().getViewHandlerMap().get(type);
if (handlerClass == null) {
throw new ViewHandlerException("Unknown handler type: " + type);
}
try {
handler = (ViewHandler) ObjectType.getInstance(handlerClass); handler.setName(type); handler.init(context);
} catch (ClassNotFoundException cnf) {
//throw new ViewHandlerException("Cannot load handler class", cnf);
Debug.logWarning("Warning: could not load view handler class because it was not found; note that some views may not work: " + cnf.toString(), module);
} catch (InstantiationException ie) {
throw new ViewHandlerException("Cannot get instance of the handler", ie);
} catch (IllegalAccessException iae) {
throw new ViewHandlerException(iae.getMessage(), iae);
}
return handler;
}
}
ViewHandler 객체가 만들어진 다음 init() 메서드를 실행합니다.구체적인 Velocity ViewHandler의 경우 그 inti() 방법이 Velocity Engine의 초기화를 완성했다.
public class VelocityViewHandler extends AbstractViewHandler {
public void init(ServletContext context) throws ViewHandlerException {
try {
Debug.logInfo("[VelocityViewHandler.init] : Loading...", module);
ve = new VelocityEngine();
// set the properties
// use log4j for logging
// use classpath template loading (file loading will not work in WAR)
ve.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
"org.apache.velocity.runtime.log.Log4JLogSystem");
ve.setProperty("runtime.log.logsystem.log4j.category", module);
Properties props = null;
try {
props = UtilProperties.getProperties(context.getResource("/WEB-INF/velocity.properties"));
Debug.logInfo("[VelocityViewHandler.init] : Loaded /WEB-INF/velocity.properties", module);
} catch (MalformedURLException e) {
Debug.logError(e, module);
}
if (props == null) {
props = new Properties();
Debug.logWarning("[VelocityViewHandler.init] : Cannot load /WEB-INF/velocity.properties. " +
"Using default properties.", module);
}
// set the file loader path -- used to mount the webapp
if (context.getRealPath("/") != null) {
props.setProperty("file.resource.loader.path", context.getRealPath("/"));
Debug.logInfo("[VelocityViewHandler.init] : Got true webapp path, mounting as template path.", module);
}
ve.init(props);
} catch (Exception e) {
throw new ViewHandlerException(e.getMessage(), e);
}
}
}