| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.yarn.webapp.view; |
| |
| import java.io.CharArrayWriter; |
| import java.io.PrintWriter; |
| |
| import static org.apache.hadoop.yarn.webapp.Params.*; |
| |
| /** |
| * A jquery-ui themeable error page |
| */ |
| public class ErrorPage extends HtmlPage { |
| |
| @Override |
| protected void render(Page.HTML<_> html) { |
| set(JQueryUI.ACCORDION_ID, "msg"); |
| String title = "Sorry, got error "+ status(); |
| html. |
| title(title). |
| link(root_url("static","yarn.css")). |
| _(JQueryUI.class). // an embedded sub-view |
| style("#msg { margin: 1em auto; width: 88%; }", |
| "#msg h1 { padding: 0.2em 1.5em; font: bold 1.3em serif; }"). |
| div("#msg"). |
| h1(title). |
| div(). |
| _("Please consult"). |
| a("http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html", |
| "RFC 2616")._(" for meanings of the error code.")._(). |
| h1("Error Details"). |
| pre(). |
| _(errorDetails())._()._()._(); |
| } |
| |
| protected String errorDetails() { |
| if (!$(ERROR_DETAILS).isEmpty()) { |
| return $(ERROR_DETAILS); |
| } |
| if (error() != null) { |
| return toStackTrace(error(), 1024 * 64); |
| } |
| return "No exception was thrown."; |
| } |
| |
| public static String toStackTrace(Throwable error, int cutoff) { |
| // default initial size is 32 chars |
| CharArrayWriter buffer = new CharArrayWriter(8 * 1024); |
| error.printStackTrace(new PrintWriter(buffer)); |
| return buffer.size() < cutoff ? buffer.toString() |
| : buffer.toString().substring(0, cutoff); |
| } |
| } |