mirror of https://github.com/apache/openjpa.git
207 lines
7.2 KiB
Plaintext
207 lines
7.2 KiB
Plaintext
<%--
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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--%>
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<!-- =========================================================================== -->
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<!-- This JSP page demonstrates changing status of a Purchase Order. -->
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<!-- =========================================================================== -->
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<%@page import="openbook.server.OpenBookService"%>
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<%@page import="openbook.domain.Book"%>
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<%@page import="openbook.domain.Customer"%>
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<%@page import="openbook.domain.ShoppingCart"%>
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<%@page import="openbook.domain.PurchaseOrder"%>
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<%@page import="openbook.domain.LineItem"%>
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<%@page import="openbook.util.JSPUtility"%>
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<%@page import="java.util.Map"%>
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<%@page import="java.util.List"%>
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<%@page import="java.util.ArrayList"%>
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<%@include file="header.jsp"%>
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<div id="help">
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<h3>Optimistic semantics and Orphan Delete</h3>
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This page displays all the orders placed by the current users.
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This page also allows to
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<A HREF="generated-html/openbook/server/OpenBookServiceImpl.java.html#deliver" type="popup">
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<em>deliver</em></A> an order. Delivering an order essentially amounts to
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decrementing the inventory for each line item,
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<A href="generated-html/openbook/domain/PurchaseOrder.java.html#setDelivered" type="popup">changing the status</A>
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which, as an interesting side-effect, nullifies the Line Items.
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<ul>
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<li><b>Optimistic Semantics</b>: Delivery is one of the operations that may fail due to
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optimistic transaction model used by OpenBooks and which is also the default transaction model
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proposed in JPA. The optimistic transaction model promoted that an Order can <em>always</em>
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be placed, even if the inventory is inadequate. Only while fulfilling the order in a separate
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transaction, the insufficient inventory may fail to deliver an order.
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</li>
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<li><b>Orphan Delete</b>: JPA 2.0 had added support for composite relation via new orphan delete
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functionality. To demonstrate its effect, on delivery an Order nullifies its Line Items. As a
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result, the Line Items gets deleted from the database as they are no more referred. That is why,
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for pending orders, you can see their line items -- but once an order is delivered its line items
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are no more available.
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</li>
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</ul>
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</div>
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<div id="content" style="width: 600px; display: block">
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<%
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OpenBookService service = (OpenBookService)session.getAttribute(KEY_SERVICE);
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if (service == null) {
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%>
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<jsp:forward page="<%= PAGE_HOME %>"></jsp:forward>
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<%
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}
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if (ACTION_DELIVER.equals(request.getParameter(KEY_ACTION))) {
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String oid = request.getParameter(KEY_OID);
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PurchaseOrder order = (PurchaseOrder)session.getAttribute(oid);
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service.deliver(order);
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}
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Customer customer = (Customer)session.getAttribute(KEY_USER);
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List<PurchaseOrder> pendingOrders = service.getOrders(PurchaseOrder.Status.DELIVERED, customer);
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List<PurchaseOrder> deliveredOrders = service.getOrders(PurchaseOrder.Status.PENDING, customer);
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List<PurchaseOrder> orders = new ArrayList<PurchaseOrder>(pendingOrders);
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orders.addAll(deliveredOrders);
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if (orders.isEmpty()) {
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%>
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<%= customer.getName() %>, you have not placed any order yet.<br>
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<%
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return;
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}
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%>
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<table>
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<caption><%= customer.getName() %>, you have placed <%= orders.size() %> (
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<%= pendingOrders.size() == 0 ? "none" : "" + pendingOrders.size()%> pending,
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<%= deliveredOrders.size() == 0 ? " none" : " " + deliveredOrders.size()%> delivered) orders
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</caption>
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<thead>
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<tr>
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<th width="06em">ID</th>
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<th width="04em">Total</th>
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<th width="10em">Placed On</th>
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<th width="08em">Status</th>
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<th width="10em">Delivered On</th>
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<th width="08em">Deliver</th>
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</tr>
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</thead>
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<tfoot>
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</tfoot>
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<tbody>
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<%
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int i = 0;
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for (PurchaseOrder order : orders) {
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session.setAttribute(""+order.getId(), order);
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%>
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<TR class="<%= i++%2 == 0 ? ROW_STYLE_EVEN : ROW_STYLE_ODD %>">
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<TD> <A HREF="<%= JSPUtility.encodeURL(PAGE_ORDERS,
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KEY_ACTION, ACTION_DETAILS,
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KEY_OID,
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order.getId()) %>"> <%= order.getId() %></A></TD>
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<TD> <%= order.getTotal() %> </TD>
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<TD> <%= JSPUtility.format(order.getPlacedOn()) %> </TD>
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<TD> <%= order.getStatus() %> </TD>
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<%
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if (order.isDelivered()) {
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%>
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<TD> <%= JSPUtility.format(order.getDeliveredOn()) %> </TD>
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<TD> </TD>
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<%
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} else {
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%>
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<TD> </TD>
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<TD> <A HREF="<%= JSPUtility.encodeURL(PAGE_ORDERS, KEY_ACTION, ACTION_DELIVER,
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KEY_OID, order.getId()) %>">
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<img src="images/orders.gif" width="156px" height="27px" border="0"></A></TD>
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<%
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}
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%>
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</TR>
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<%
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}
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%>
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</tbody>
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</table>
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<p></p>
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<%
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if (ACTION_DETAILS.equals(request.getParameter(KEY_ACTION))) {
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String oid = request.getParameter(KEY_OID);
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PurchaseOrder order = (PurchaseOrder)session.getAttribute(oid);
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List<LineItem> items = order.getItems();
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if (order.isDelivered()) {
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if (items != null && items.isEmpty()) {
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%>
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Order <%= order.getId() %> has been delivered. Line items of delivered orders are automatically
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deleted due to orphan delete nature of Master-Details relationship.
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<% } else {
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%>
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Order <%= order.getId() %> has been delivered but still contains line items.
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This is an implementation error because delivered orders must have at least one line item by design.
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<%
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}
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} else {
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%>
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<table>
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<caption>Total of <%= items.size() %> Book<%= items.size() == 0 ? "" : "s" %>
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in Order <%= order.getId() %>
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</caption>
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<thead>
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<tr>
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<th width="10em">Title</th>
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<th width="06em">Price</th>
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<th width="04em">Quantity</th>
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<th width="06em">Cost</th>
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</tr>
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</thead>
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<tbody>
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<%
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int j = 0;
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for (LineItem item : items) {
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%>
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<TR class="<%= j++%2 == 0 ? ROW_STYLE_EVEN : ROW_STYLE_ODD %>">
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<TD> <%= item.getBook().getTitle() %> </TD>
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<TD> <%= JSPUtility.format(item.getBook().getPrice()) %> </TD>
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<TD> <%= item.getQuantity() %> </TD>
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<TD> <%= JSPUtility.format(item.getBook().getPrice() * item.getQuantity()) %> </TD>
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</TR>
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<%
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}
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%>
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<TR>
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<TD>Total</TD><TD></TD><TD></TD>
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<TD><%= JSPUtility.format(order.getTotal()) %></TD>
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</TR>
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</tbody>
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</table>
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<%
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}
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}
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%>
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</div>
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<%@include file="footer.jsp"%>
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