Java tutorial
/** * 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.server.webapp; import static org.apache.hadoop.yarn.util.StringHelper.join; import static org.apache.hadoop.yarn.webapp.YarnWebParams.APP_STATE; import static org.apache.hadoop.yarn.webapp.YarnWebParams.APP_START_TIME_BEGIN; import static org.apache.hadoop.yarn.webapp.YarnWebParams.APP_START_TIME_END; import static org.apache.hadoop.yarn.webapp.YarnWebParams.APPS_NUM; import static org.apache.hadoop.yarn.webapp.view.JQueryUI.C_PROGRESSBAR; import static org.apache.hadoop.yarn.webapp.view.JQueryUI.C_PROGRESSBAR_VALUE; import java.io.IOException; import java.security.PrivilegedExceptionAction; import java.util.Collection; import java.util.EnumSet; import org.apache.commons.lang.StringEscapeUtils; import org.apache.commons.lang.math.LongRange; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.security.UserGroupInformation; import org.apache.hadoop.util.StringUtils; import org.apache.hadoop.yarn.api.ApplicationBaseProtocol; import org.apache.hadoop.yarn.api.protocolrecords.GetApplicationsRequest; import org.apache.hadoop.yarn.api.records.ApplicationReport; import org.apache.hadoop.yarn.api.records.YarnApplicationState; import org.apache.hadoop.yarn.exceptions.YarnException; import org.apache.hadoop.yarn.server.webapp.dao.AppInfo; import org.apache.hadoop.yarn.webapp.BadRequestException; import org.apache.hadoop.yarn.webapp.hamlet.Hamlet; import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TABLE; import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TBODY; import org.apache.hadoop.yarn.webapp.view.HtmlBlock; import com.google.inject.Inject; public class AppsBlock extends HtmlBlock { private static final Log LOG = LogFactory.getLog(AppsBlock.class); protected ApplicationBaseProtocol appBaseProt; protected EnumSet<YarnApplicationState> reqAppStates; protected UserGroupInformation callerUGI; protected Collection<ApplicationReport> appReports; @Inject protected AppsBlock(ApplicationBaseProtocol appBaseProt, ViewContext ctx) { super(ctx); this.appBaseProt = appBaseProt; } protected void fetchData() throws YarnException, IOException, InterruptedException { reqAppStates = EnumSet.noneOf(YarnApplicationState.class); String reqStateString = $(APP_STATE); if (reqStateString != null && !reqStateString.isEmpty()) { String[] appStateStrings = reqStateString.split(","); for (String stateString : appStateStrings) { reqAppStates.add(YarnApplicationState.valueOf(stateString.trim())); } } callerUGI = getCallerUGI(); final GetApplicationsRequest request = GetApplicationsRequest.newInstance(reqAppStates); String appsNumStr = $(APPS_NUM); if (appsNumStr != null && !appsNumStr.isEmpty()) { long appsNum = Long.parseLong(appsNumStr); request.setLimit(appsNum); } String appStartedTimeBegainStr = $(APP_START_TIME_BEGIN); long appStartedTimeBegain = 0; if (appStartedTimeBegainStr != null && !appStartedTimeBegainStr.isEmpty()) { appStartedTimeBegain = Long.parseLong(appStartedTimeBegainStr); if (appStartedTimeBegain < 0) { throw new BadRequestException("app.started-time.begin must be greater than 0"); } } String appStartedTimeEndStr = $(APP_START_TIME_END); long appStartedTimeEnd = Long.MAX_VALUE; if (appStartedTimeEndStr != null && !appStartedTimeEndStr.isEmpty()) { appStartedTimeEnd = Long.parseLong(appStartedTimeEndStr); if (appStartedTimeEnd < 0) { throw new BadRequestException("app.started-time.end must be greater than 0"); } } if (appStartedTimeBegain > appStartedTimeEnd) { throw new BadRequestException("app.started-time.end must be greater than app.started-time.begin"); } request.setStartRange(new LongRange(appStartedTimeBegain, appStartedTimeEnd)); if (callerUGI == null) { appReports = appBaseProt.getApplications(request).getApplicationList(); } else { appReports = callerUGI.doAs(new PrivilegedExceptionAction<Collection<ApplicationReport>>() { @Override public Collection<ApplicationReport> run() throws Exception { return appBaseProt.getApplications(request).getApplicationList(); } }); } } @Override public void render(Block html) { setTitle("Applications"); try { fetchData(); } catch (Exception e) { String message = "Failed to read the applications."; LOG.error(message, e); html.p()._(message)._(); return; } renderData(html); } protected void renderData(Block html) { TBODY<TABLE<Hamlet>> tbody = html.table("#apps").thead().tr().th(".id", "ID").th(".user", "User") .th(".name", "Name").th(".type", "Application Type").th(".queue", "Queue") .th(".priority", "Application Priority").th(".starttime", "StartTime") .th(".finishtime", "FinishTime").th(".state", "State").th(".finalstatus", "FinalStatus") .th(".progress", "Progress").th(".ui", "Tracking UI")._()._().tbody(); StringBuilder appsTableData = new StringBuilder("[\n"); for (ApplicationReport appReport : appReports) { // TODO: remove the following condition. It is still here because // the history side implementation of ApplicationBaseProtocol // hasn't filtering capability (YARN-1819). if (!reqAppStates.isEmpty() && !reqAppStates.contains(appReport.getYarnApplicationState())) { continue; } AppInfo app = new AppInfo(appReport); String percent = StringUtils.format("%.1f", app.getProgress()); appsTableData.append("[\"<a href='").append(url("app", app.getAppId())).append("'>") .append(app.getAppId()).append("</a>\",\"") .append(StringEscapeUtils.escapeJavaScript(StringEscapeUtils.escapeHtml(app.getUser()))) .append("\",\"") .append(StringEscapeUtils.escapeJavaScript(StringEscapeUtils.escapeHtml(app.getName()))) .append("\",\"") .append(StringEscapeUtils.escapeJavaScript(StringEscapeUtils.escapeHtml(app.getType()))) .append("\",\"") .append(StringEscapeUtils.escapeJavaScript(StringEscapeUtils.escapeHtml(app.getQueue()))) .append("\",\"").append(String.valueOf(app.getPriority())).append("\",\"") .append(app.getStartedTime()).append("\",\"").append(app.getFinishedTime()).append("\",\"") .append(app.getAppState() == null ? UNAVAILABLE : app.getAppState()).append("\",\"") .append(app.getFinalAppStatus()).append("\",\"") // Progress bar .append("<br title='").append(percent).append("'> <div class='").append(C_PROGRESSBAR) .append("' title='").append(join(percent, '%')).append("'> ").append("<div class='") .append(C_PROGRESSBAR_VALUE).append("' style='").append(join("width:", percent, '%')) .append("'> </div> </div>").append("\",\"<a "); String trackingURL = app.getTrackingUrl() == null || app.getTrackingUrl().equals(UNAVAILABLE) ? null : app.getTrackingUrl(); String trackingUI = app.getTrackingUrl() == null || app.getTrackingUrl().equals(UNAVAILABLE) ? "Unassigned" : app.getAppState() == YarnApplicationState.FINISHED || app.getAppState() == YarnApplicationState.FAILED || app.getAppState() == YarnApplicationState.KILLED ? "History" : "ApplicationMaster"; appsTableData.append(trackingURL == null ? "#" : "href='" + trackingURL).append("'>").append(trackingUI) .append("</a>\"],\n"); } if (appsTableData.charAt(appsTableData.length() - 2) == ',') { appsTableData.delete(appsTableData.length() - 2, appsTableData.length() - 1); } appsTableData.append("]"); html.script().$type("text/javascript")._("var appsTableData=" + appsTableData)._(); tbody._()._(); } }