001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.oozie.servlet;
019
020 import java.io.IOException;
021 import java.util.ArrayList;
022 import java.util.Arrays;
023 import java.util.HashMap;
024 import java.util.HashSet;
025 import java.util.List;
026 import java.util.Map;
027 import java.util.Set;
028 import java.util.StringTokenizer;
029
030 import javax.servlet.ServletException;
031 import javax.servlet.http.HttpServletRequest;
032 import javax.servlet.http.HttpServletResponse;
033 import org.apache.oozie.ErrorCode;
034 import org.apache.oozie.SLAEventBean;
035 import org.apache.oozie.client.OozieClient;
036 import org.apache.oozie.client.rest.RestConstants;
037 import org.apache.oozie.command.CommandException;
038 import org.apache.oozie.command.coord.SLAEventsXCommand;
039 import org.apache.oozie.util.XLog;
040 import org.apache.oozie.util.XmlUtils;
041 import org.jdom.Element;
042
043 @SuppressWarnings("deprecation")
044 public class SLAServlet extends JsonRestServlet {
045
046 private static final Set<String> SLA_FILTER_NAMES = new HashSet<String>();
047
048 static {
049 SLA_FILTER_NAMES.add(OozieClient.FILTER_JOBID);
050 SLA_FILTER_NAMES.add(OozieClient.FILTER_APPNAME);
051 }
052
053 private static final String INSTRUMENTATION_NAME = "sla";
054
055 private static final JsonRestServlet.ResourceInfo RESOURCES_INFO[] = new JsonRestServlet.ResourceInfo[1];
056
057 static {
058 RESOURCES_INFO[0] = new JsonRestServlet.ResourceInfo("", Arrays.asList("GET"), Arrays.asList(
059 new JsonRestServlet.ParameterInfo(RestConstants.SLA_GT_SEQUENCE_ID, String.class, false, Arrays
060 .asList("GET")), new JsonRestServlet.ParameterInfo(RestConstants.MAX_EVENTS, String.class,
061 false, Arrays.asList("GET")), new JsonRestServlet.ParameterInfo(
062 RestConstants.JOBS_FILTER_PARAM, String.class, false, Arrays.asList("GET"))));
063 }
064
065 public SLAServlet() {
066 super(INSTRUMENTATION_NAME, RESOURCES_INFO);
067 }
068
069 public SLAServlet(String instrumentationName, ResourceInfo... resourcesInfo) {
070 super(instrumentationName, resourcesInfo);
071 }
072
073 /**
074 * Return information about SLA Events.
075 */
076 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
077
078 Element eResponse = new Element("sla-message");
079 List<SLAEventBean> slaEvntList = null;
080
081 try {
082 stopCron();
083 String gtSequenceNum = request.getParameter(RestConstants.SLA_GT_SEQUENCE_ID);
084 String strMaxEvents = request.getParameter(RestConstants.MAX_EVENTS);
085 String filter = request.getParameter(RestConstants.JOBS_FILTER_PARAM);
086 Map<String, List<String>> filterList = parseFilter(filter, SLA_FILTER_NAMES);
087
088 int maxNoEvents = 100; // Default
089 XLog.getLog(getClass()).debug(
090 "Got SLA GET request for :" + gtSequenceNum + " and max-events :" + strMaxEvents);
091 if (strMaxEvents != null && strMaxEvents.length() > 0) {
092 maxNoEvents = Integer.parseInt(strMaxEvents);
093 }
094
095 if (gtSequenceNum != null) {
096 long seqId = Long.parseLong(gtSequenceNum);
097 stopCron();
098 SLAEventsXCommand seCommand = new SLAEventsXCommand(seqId, maxNoEvents, filterList);
099 slaEvntList = seCommand.call();
100 long lastSeqId = seCommand.getLastSeqId();
101
102 eResponse = new Element("sla-message");
103 for (SLAEventBean event : slaEvntList) {
104 eResponse.addContent(event.toXml());
105 }
106 Element eLastSeq = new Element("last-sequence-id");
107 eLastSeq.addContent(String.valueOf(lastSeqId));
108 eResponse.addContent(eLastSeq);
109 XLog.getLog(getClass()).debug("Writing back SLA Servlet Caller with last-seq-id " + lastSeqId);
110 startCron();
111 }
112 else {
113 XLog.getLog(getClass()).error("gt-sequence-id parameter is not specified in the http request");
114 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
115 "gt-sequence-id parameter is not specified in the http request");
116 }
117 startCron();
118 response.setContentType(XML_UTF8);
119 response.setStatus(HttpServletResponse.SC_OK);
120 response.getWriter().write(XmlUtils.prettyPrint(eResponse) + "\n");
121 }
122 catch (CommandException ce) {
123 ce.printStackTrace();
124 XLog.getLog(getClass()).error("Command exception ", ce);
125 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ce);
126 }
127 catch (RuntimeException re) {
128 re.printStackTrace();
129 XLog.getLog(getClass()).error("Runtime error ", re);
130 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0307, re.getMessage());
131 }
132 }
133
134 protected Map<String, List<String>> parseFilter(String filterString, Set<String> allowedFilters) throws ServletException {
135 Map<String, List<String>> map = new HashMap<String, List<String>>();
136 if (filterString != null) {
137 StringTokenizer st = new StringTokenizer(filterString, ";");
138 while (st.hasMoreTokens()) {
139 String token = st.nextToken();
140 if (token.contains("=")) {
141 String[] pair = token.split("=");
142 if (pair.length != 2) {
143 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
144 "elements must be name=value pairs");
145 }
146 if (!allowedFilters.contains(pair[0])) {
147 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
148 "invalid/unsupported names in filter");
149 }
150 List<String> list = map.get(pair[0]);
151 if (list == null) {
152 list = new ArrayList<String>();
153 map.put(pair[0], list);
154 }
155 list.add(pair[1]);
156 }
157 else {
158 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
159 "elements must be name=value pairs");
160 }
161 }
162 }
163 return map;
164 }
165
166 }