/**
* 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.oozie.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.oozie.ErrorCode;
import org.apache.oozie.SLAEventBean;
import org.apache.oozie.client.OozieClient;
import org.apache.oozie.client.rest.RestConstants;
import org.apache.oozie.command.CommandException;
import org.apache.oozie.command.coord.SLAEventsXCommand;
import org.apache.oozie.util.XLog;
import org.apache.oozie.util.XmlUtils;
import org.jdom.Element;
public class SLAServlet extends JsonRestServlet {
private static final Set<String> SLA_FILTER_NAMES = new HashSet<String>();
static {
SLA_FILTER_NAMES.add(OozieClient.FILTER_JOBID);
SLA_FILTER_NAMES.add(OozieClient.FILTER_APPNAME);
}
private static final String INSTRUMENTATION_NAME = "sla";
private static final JsonRestServlet.ResourceInfo RESOURCES_INFO[] = new JsonRestServlet.ResourceInfo[1];
static {
RESOURCES_INFO[0] = new JsonRestServlet.ResourceInfo("", Arrays.asList("GET"), Arrays.asList(
new JsonRestServlet.ParameterInfo(RestConstants.SLA_GT_SEQUENCE_ID, String.class, false, Arrays
.asList("GET")), new JsonRestServlet.ParameterInfo(RestConstants.MAX_EVENTS, String.class,
false, Arrays.asList("GET")), new JsonRestServlet.ParameterInfo(
RestConstants.JOBS_FILTER_PARAM, String.class, false, Arrays.asList("GET"))));
}
public SLAServlet() {
super(INSTRUMENTATION_NAME, RESOURCES_INFO);
}
/**
* Return information about SLA Events.
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Element eResponse = new Element("sla-message");
List<SLAEventBean> slaEvntList = null;
try {
stopCron();
String gtSequenceNum = request.getParameter(RestConstants.SLA_GT_SEQUENCE_ID);
String strMaxEvents = request.getParameter(RestConstants.MAX_EVENTS);
String filter = request.getParameter(RestConstants.JOBS_FILTER_PARAM);
Map<String, List<String>> filterList = parseFilter(filter);
int maxNoEvents = 100; // Default
XLog.getLog(getClass()).debug(
"Got SLA GET request for :" + gtSequenceNum + " and max-events :" + strMaxEvents);
if (strMaxEvents != null && strMaxEvents.length() > 0) {
maxNoEvents = Integer.parseInt(strMaxEvents);
}
if (gtSequenceNum != null) {
long seqId = Long.parseLong(gtSequenceNum);
stopCron();
SLAEventsXCommand seCommand = new SLAEventsXCommand(seqId, maxNoEvents, filterList);
slaEvntList = seCommand.call();
long lastSeqId = seCommand.getLastSeqId();
eResponse = new Element("sla-message");
for (SLAEventBean event : slaEvntList) {
eResponse.addContent(event.toXml());
}
Element eLastSeq = new Element("last-sequence-id");
eLastSeq.addContent(String.valueOf(lastSeqId));
eResponse.addContent(eLastSeq);
XLog.getLog(getClass()).debug("Writing back SLA Servlet Caller with last-seq-id " + lastSeqId);
startCron();
}
else {
XLog.getLog(getClass()).error("gt-sequence-id parameter is not specified in the http request");
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
"gt-sequence-id parameter is not specified in the http request");
}
startCron();
response.setContentType(XML_UTF8);
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().write(XmlUtils.prettyPrint(eResponse) + "\n");
}
catch (CommandException ce) {
ce.printStackTrace();
XLog.getLog(getClass()).error("Command exception ", ce);
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ce);
}
catch (RuntimeException re) {
re.printStackTrace();
XLog.getLog(getClass()).error("Runtime error ", re);
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0307, re.getMessage());
}
}
protected Map<String, List<String>> parseFilter(String filter) throws ServletException {
Map<String, List<String>> map = new HashMap<String, List<String>>();
if (filter != null) {
StringTokenizer st = new StringTokenizer(filter, ";");
while (st.hasMoreTokens()) {
String token = st.nextToken();
if (token.contains("=")) {
String[] pair = token.split("=");
if (pair.length != 2) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
"elements must be name=value pairs");
}
if (!SLA_FILTER_NAMES.contains(pair[0])) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
"invalid/unsupported names in filter");
}
List<String> list = map.get(pair[0]);
if (list == null) {
list = new ArrayList<String>();
map.put(pair[0], list);
}
list.add(pair[1]);
}
else {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0401,
"elements must be name=value pairs");
}
}
}
return map;
}
}