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 public class SLAServlet extends JsonRestServlet {
044
045 private static final Set<String> SLA_FILTER_NAMES = new HashSet<String>();
046
047 static {
048 SLA_FILTER_NAMES.add(OozieClient.FILTER_JOBID);
049 SLA_FILTER_NAMES.add(OozieClient.FILTER_APPNAME);
050 }
051
052 private static final String INSTRUMENTATION_NAME = "sla";
053
054 private static final JsonRestServlet.ResourceInfo RESOURCES_INFO[] = new JsonRestServlet.ResourceInfo[1];
055
056 static {
057 RESOURCES_INFO[0] = new JsonRestServlet.ResourceInfo("", Arrays.asList("GET"), Arrays.asList(
058 new JsonRestServlet.ParameterInfo(RestConstants.SLA_GT_SEQUENCE_ID, String.class, false, Arrays
059 .asList("GET")), new JsonRestServlet.ParameterInfo(RestConstants.MAX_EVENTS, String.class,
060 false, Arrays.asList("GET")), new JsonRestServlet.ParameterInfo(
061 RestConstants.JOBS_FILTER_PARAM, String.class, false, Arrays.asList("GET"))));
062 }
063
064 public SLAServlet() {
065 super(INSTRUMENTATION_NAME, RESOURCES_INFO);
066 }
067
068 /**
069 * Return information about SLA Events.
070 */
071 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
072
073 Element eResponse = new Element("sla-message");
074 List<SLAEventBean> slaEvntList = null;
075
076 try {
077 stopCron();
078 String gtSequenceNum = request.getParameter(RestConstants.SLA_GT_SEQUENCE_ID);
079 String strMaxEvents = request.getParameter(RestConstants.MAX_EVENTS);
080 String filter = request.getParameter(RestConstants.JOBS_FILTER_PARAM);
081 Map<String, List<String>> filterList = parseFilter(filter);
082
083 int maxNoEvents = 100; // Default
084 XLog.getLog(getClass()).debug(
085 "Got SLA GET request for :" + gtSequenceNum + " and max-events :" + strMaxEvents);
086 if (strMaxEvents != null && strMaxEvents.length() > 0) {
087 maxNoEvents = Integer.parseInt(strMaxEvents);
088 }
089
090 if (gtSequenceNum != null) {
091 long seqId = Long.parseLong(gtSequenceNum);
092 stopCron();
093 SLAEventsXCommand seCommand = new SLAEventsXCommand(seqId, maxNoEvents, filterList);
094 slaEvntList = seCommand.call();
095 long lastSeqId = seCommand.getLastSeqId();
096
097 eResponse = new Element("sla-message");
098 for (SLAEventBean event : slaEvntList) {
099 eResponse.addContent(event.toXml());
100 }
101 Element eLastSeq = new Element("last-sequence-id");
102 eLastSeq.addContent(String.valueOf(lastSeqId));
103 eResponse.addContent(eLastSeq);
104 XLog.getLog(getClass()).debug("Writing back SLA Servlet Caller with last-seq-id " + lastSeqId);
105 startCron();
106 }
107 else {
108 XLog.getLog(getClass()).error("gt-sequence-id parameter is not specified in the http request");
109 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
110 "gt-sequence-id parameter is not specified in the http request");
111 }
112 startCron();
113 response.setContentType(XML_UTF8);
114 response.setStatus(HttpServletResponse.SC_OK);
115 response.getWriter().write(XmlUtils.prettyPrint(eResponse) + "\n");
116 }
117 catch (CommandException ce) {
118 ce.printStackTrace();
119 XLog.getLog(getClass()).error("Command exception ", ce);
120 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ce);
121 }
122 catch (RuntimeException re) {
123 re.printStackTrace();
124 XLog.getLog(getClass()).error("Runtime error ", re);
125 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0307, re.getMessage());
126 }
127 }
128
129 protected Map<String, List<String>> parseFilter(String filter) throws ServletException {
130 Map<String, List<String>> map = new HashMap<String, List<String>>();
131 if (filter != null) {
132 StringTokenizer st = new StringTokenizer(filter, ";");
133 while (st.hasMoreTokens()) {
134 String token = st.nextToken();
135 if (token.contains("=")) {
136 String[] pair = token.split("=");
137 if (pair.length != 2) {
138 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
139 "elements must be name=value pairs");
140 }
141 if (!SLA_FILTER_NAMES.contains(pair[0])) {
142 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
143 "invalid/unsupported names in filter");
144 }
145 List<String> list = map.get(pair[0]);
146 if (list == null) {
147 list = new ArrayList<String>();
148 map.put(pair[0], list);
149 }
150 list.add(pair[1]);
151 }
152 else {
153 throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
154 "elements must be name=value pairs");
155 }
156 }
157 }
158 return map;
159 }
160
161 }