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.ambari.view.slider.rest.client; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import org.apache.ambari.view.URLStreamProvider; import org.apache.ambari.view.ViewContext; import org.apache.ambari.view.slider.MetricsHolder; import org.apache.ambari.view.slider.SliderAppType; import org.apache.ambari.view.slider.SliderAppTypeComponent; import org.apache.ambari.view.slider.TemporalInfo; import org.apache.commons.httpclient.HttpException; import org.apache.ambari.view.slider.SliderAppsViewController; import org.apache.log4j.Logger; import com.google.gson.JsonElement; import com.google.gson.JsonObject; public class SliderAppMasterClient extends BaseHttpClient { private static final Logger logger = Logger.getLogger(SliderAppMasterClient.class); public SliderAppMasterClient(String url) { super(url); } public SliderAppMasterData getAppMasterData() { try { String html = doGet(""); if (html != null) { int from = html.lastIndexOf("<ul>"); int to = html.lastIndexOf("</ul>"); if (from < to && from > -1) { SliderAppMasterData data = new SliderAppMasterData(); String content = html.substring(from, to); content = content.replaceAll("<[^>]*>", "\r\n"); String[] splits = content.split("\r\n"); for (int i = 0; i < splits.length; i++) { String split = splits[i].trim(); if ("classpath:org.apache.slider.registry".equals(split)) { data.registryUrl = splits[i + 1].trim(); } else if ("classpath:org.apache.http.UI".equals(split)) { data.uiUrl = splits[i + 1].trim(); } else if ("classpath:org.apache.slider.management".equals(split)) { data.managementUrl = splits[i + 1].trim(); } else if ("classpath:org.apache.slider.publisher".equals(split)) { data.publisherUrl = splits[i + 1].trim(); } } return data; } } } catch (HttpException e) { logger.warn("Unable to determine Ambari clusters", e); throw new RuntimeException(e.getMessage(), e); } catch (IOException e) { logger.warn("Unable to determine Ambari clusters", e); throw new RuntimeException(e.getMessage(), e); } return null; } public Map<String, String> getQuickLinks(String providerUrl) { Map<String, String> quickLinks = new HashMap<String, String>(); try { if (providerUrl == null || providerUrl.trim().length() < 1) { return quickLinks; } JsonElement json = super.doGetJson(providerUrl, "/slider/quicklinks"); if (json != null && json.getAsJsonObject() != null && json.getAsJsonObject().has("entries")) { JsonObject jsonObject = json.getAsJsonObject().get("entries").getAsJsonObject(); for (Entry<String, JsonElement> entry : jsonObject.entrySet()) { if ("org.apache.slider.jmx".equals(entry.getKey())) { quickLinks.put("JMX", entry.getValue().getAsString()); } else if ("org.apache.slider.monitor".equals(entry.getKey())) { quickLinks.put("UI", entry.getValue().getAsString()); } else if ("org.apache.slider.metrics.ui".equals(entry.getKey())) { quickLinks.put("Metrics UI", entry.getValue().getAsString()); } else if ("org.apache.slider.metrics".equals(entry.getKey())) { quickLinks.put(SliderAppsViewController.METRICS_API_NAME, entry.getValue().getAsString()); } else { quickLinks.put(entry.getKey(), entry.getValue().getAsString()); } } } } catch (HttpException e) { logger.warn("Unable to determine quicklinks from " + providerUrl, e); } catch (IOException e) { logger.warn("Unable to determine quicklinks from " + providerUrl, e); } return quickLinks; } public Map<String, Map<String, String>> getConfigs(String providerUrl) { Map<String, Map<String, String>> configsMap = new HashMap<String, Map<String, String>>(); try { if (providerUrl == null || providerUrl.trim().length() < 1) { return configsMap; } JsonElement json = super.doGetJson(providerUrl, "/slider"); if (json != null) { JsonObject configsJson = json.getAsJsonObject().get("configurations").getAsJsonObject(); for (Entry<String, JsonElement> entry : configsJson.entrySet()) { if ("complete-config".equals(entry.getKey()) || "quicklinks".equals(entry.getKey())) { continue; } JsonElement entryJson = super.doGetJson(providerUrl, "/slider/" + entry.getKey()); if (entryJson != null) { JsonObject configsObj = entryJson.getAsJsonObject().get("entries").getAsJsonObject(); if (configsObj != null) { Map<String, String> configs = new HashMap<String, String>(); for (Entry<String, JsonElement> e : configsObj.entrySet()) { configs.put(e.getKey(), e.getValue().getAsString()); } configsMap.put(entry.getKey(), configs); } } } } } catch (HttpException e) { logger.warn("Unable to determine quicklinks from " + providerUrl, e); } catch (IOException e) { logger.warn("Unable to determine quicklinks from " + providerUrl, e); } return configsMap; } public Map<String, Number[][]> getMetrics(String appName, String metricsUrl, Set<String> metricsRequested, TemporalInfo temporalInfo, ViewContext context, SliderAppType appType, MetricsHolder metricsHolder) { Map<String, Number[][]> retVal = new HashMap<String, Number[][]>(); if (appType == null || metricsHolder == null || metricsHolder.getTimelineMetrics() == null) { logger.info("AppType must be provided and it must contain " + "timeline_metrics.json to extract jmx properties"); return retVal; } Map<String, Number[][]> receivedMetrics = null; List<String> components = new ArrayList<String>(); for (SliderAppTypeComponent appTypeComponent : appType.getTypeComponents()) { components.add(appTypeComponent.getName()); } Map<String, Map<String, Map<String, Metric>>> metrics = metricsHolder.getTimelineMetrics(); Map<String, Metric> relevantMetrics = getRelevantMetrics(metrics, components); Set<String> metricsToRead = new HashSet<String>(); Map<String, String> reverseNameLookup = new HashMap<String, String>(); for (String key : relevantMetrics.keySet()) { if (metricsRequested.contains(key)) { String metricName = relevantMetrics.get(key).getMetric(); metricsToRead.add(metricName); reverseNameLookup.put(metricName, key); } } if (metricsToRead.size() != 0) { try { String specWithParams = SliderAppMetricsHelper.getUrlWithParams(appName, metricsUrl, metricsToRead, temporalInfo); logger.info("Using spec: " + specWithParams); if (specWithParams != null) { String spec = null; String params = null; String[] tokens = specWithParams.split("\\?", 2); try { spec = tokens[0]; params = tokens[1]; } catch (ArrayIndexOutOfBoundsException e) { logger.info(e.toString()); } receivedMetrics = SliderAppMetricsHelper.getMetrics(context, spec, params); } } catch (Exception e) { logger.warn("Unable to retrieve metrics. " + e.getMessage()); } } if (receivedMetrics != null) { for (Map.Entry<String, Number[][]> metric : receivedMetrics.entrySet()) { if (reverseNameLookup.containsKey(metric.getKey())) { retVal.put(reverseNameLookup.get(metric.getKey()), metric.getValue()); } } } return retVal; } /** * Provides only the interesting JMX metric names and values. * * @param jmxUrl * * @return */ public Map<String, String> getJmx(String jmxUrl, ViewContext context, SliderAppType appType, MetricsHolder metricsHolder) { Map<String, String> jmxProperties = new HashMap<String, String>(); if (appType == null || metricsHolder == null || metricsHolder.getJmxMetrics() == null) { logger.info("AppType must be provided and it must contain jmx_metrics.json to extract jmx properties"); return jmxProperties; } List<String> components = new ArrayList<String>(); for (SliderAppTypeComponent appTypeComponent : appType.getTypeComponents()) { components.add(appTypeComponent.getName()); } Map<String, Map<String, Map<String, Metric>>> metrics = metricsHolder.getJmxMetrics(); Map<String, Metric> relevantMetrics = getRelevantMetrics(metrics, components); if (relevantMetrics.size() == 0) { logger.info("No metrics found for components defined in the app."); return jmxProperties; } SliderAppJmxHelper.JMXTypes jmxType = SliderAppJmxHelper.jmxTypeExpected(relevantMetrics); if (jmxType == null) { logger.info( "jmx_metrics.json is malformed. It may have mixed metric key types of unsupported metric key types."); return jmxProperties; } try { URLStreamProvider streamProvider = context.getURLStreamProvider(); InputStream jmxStream = null; Map<String, String> headers = new HashMap<String, String>(); try { jmxStream = streamProvider.readFrom(jmxUrl, "GET", null, headers); } catch (IOException e) { logger.error( String.format("Unable to access JMX endpoint at %s. Error %s", jmxUrl, e.getMessage())); } if (jmxStream != null) { switch (jmxType) { case JMX_BEAN: SliderAppJmxHelper.extractMetricsFromJmxBean(jmxStream, jmxUrl, jmxProperties, relevantMetrics); break; case JSON: SliderAppJmxHelper.extractMetricsFromJmxJson(jmxStream, jmxUrl, jmxProperties, relevantMetrics); break; case XML: SliderAppJmxHelper.extractMetricsFromJmxXML(jmxStream, jmxUrl, jmxProperties, relevantMetrics); break; default: logger.info("Unsupported jmx type."); } } } catch (Exception e) { logger.info("Failed to extract jmx metrics. " + e.getMessage()); } return jmxProperties; } private Map<String, Metric> getRelevantMetrics(Map<String, Map<String, Map<String, Metric>>> metrics, List<String> comps) { Map<String, Metric> relevantMetrics = new HashMap<String, Metric>(); for (String comp : comps) { for (Map<String, Map<String, Metric>> m : metrics.values()) { if (m.containsKey(comp)) { relevantMetrics.putAll(m.get(comp)); } } } return relevantMetrics; } public static class SliderAppMasterData { public String registryUrl; public String uiUrl; public String managementUrl; public String publisherUrl; } public static class SliderAppContainerData { public String hostName; public String containerId; } }