Render()'s Method different reactions - liferay

Question

I have my render() method with no code.
And I have this action-method:
#ProcessAction(name = "viewBook")
public void viewBook(ActionRequest actionRequest,ActionResponse actionResponse) throws SystemException, PortalException {
long bookId = ParamUtil.getLong(actionRequest, "bookId");
Book book = BookLocalServiceUtil.getBook(bookId);
actionRequest.setAttribute(FinalStrings.BOOK_ENTRY, book);
actionResponse.setRenderParameter("jspPage", "/html/LibraryPortlet/view_book.jsp");
How can I rewrite this "GET" method into render() method? I mean I need to run
public void render(RenderRequest renderRequest, RenderResponse rendeResponse){
super.render(renderRequest, renderResponse)
}
in the default situation and
public void render(RenderRequest renderRequest, RenderResponse rendeResponse){
\\THIS CODE IS NOT WORKING, IT'S JUST TO SHOW WHAT I WANT!
long bookId = ParamUtil.getLong(actionRequest, "bookId");
Book book = BookLocalServiceUtil.getBook(bookId);
actionRequest.setAttribute(FinalStrings.BOOK_ENTRY, book);
actionResponse.setRenderParameter("jspPage", "/html/LibraryPortlet/view_book.jsp");
when I need to use viewBook() method. How can I parametrize(?) render() method?
Update:
For more details I attached one screenshot:
Meanwhile in my action.jsp:
<liferay-ui:icon-menu>
<portlet:actionURL name="deleteBook" var="deleteURL">
<portlet:param name="bookId"
value="${String.valueOf(book.getBookId())}" />
</portlet:actionURL>
<portlet:renderURL name="viewBook" var="viewURL">
<portlet:param name="bookId"
value="${String.valueOf(book.getBookId())}" />
</portlet:renderURL>
<portlet:renderURL var="editBookURL" name="viewEdit">
<portlet:param name="bookId" value="${String.valueOf(book.getBookId())}" />
</portlet:renderURL>
<liferay-ui:icon image="add" message="View" url="${viewURL.toString()}" />
<liferay-ui:icon image="add" message="Edit" url="${editBookURL.toString()}" />
<liferay-ui:icon-delete image="delete" message="Delete" url="${deleteURL.toString()}" />
In my view_book.jsp:
<%#page import="com.softwerke.FinalStrings"%>
<%#page import="com.softwerke.model.Book"%>
<%#page import="com.softwerke.service.BookLocalServiceUtil"%>
<%#page import="com.liferay.portal.kernel.util.ParamUtil"%>
<%# include file="/html/init.jsp"%>
<portlet:renderURL var="backURL">
<portlet:param name="jspPage" value="/html/view.jsp"/>
</portlet:renderURL>
<liferay-ui:header backURL="${backURL}" title="Back" />
<%
Book book = (Book) request.getAttribute(FinalStrings.BOOK_ENTRY);
%>
<aui:form>
<aui:model-context bean="${book}" model="${Book.class}" />
<aui:input name="bookName" label="Book Name" disabled="true"/>
<aui:input type="textarea" name="description" label="Description" disabled="true"/>
<aui:input name="authorName" label="Author Name" disabled="true"/>
<aui:input name="price" label="Price" disabled="true"/>
</aui:form>
According to my task I can not use Action URL here. What should I do???

Answer 1

You can send a command param to the render, so you can split the logic into two or more render methods, depending on the command, or maybe easier, invoke a mvcPath without the need of implementing anything in render(). Include something like this in the jsp with your list of books:
<portlet:renderURL var="myBookURL">
<portlet:param name="mvcPath" value="/view_book.jsp" />
<portlet:param name="bookId" value="<%= someBookId %>" />
</portlet:renderURL>
View My Book
You just need a view_book.jsp with something like:
<%
long bookId = ParamUtil.getLong(request, "bookId");
Book book = BookLocalServiceUtil.getBook(bookId);
%>
Hope it helps.