/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
* Licensed 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. See accompanying LICENSE file.
*/
package org.apache.oozie.coord;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import org.apache.hadoop.conf.Configuration;
import org.apache.oozie.service.ELService;
import org.apache.oozie.service.Services;
import org.apache.oozie.util.DateUtils;
import org.apache.oozie.util.ELEvaluator;
import org.apache.oozie.util.XmlUtils;
import org.jdom.Element;
/**
* This class provide different evaluators required at different stages
*/
public class CoordELEvaluator {
public static final Integer MINUTE = 1;
public static final Integer HOUR = 60 * MINUTE;
/**
* Create an evaluator to be used in resolving configuration vars and frequency constant/functions (used in Stage
* 1)
*
* @param conf : Configuration containing property variables
* @return configured ELEvaluator
*/
public static ELEvaluator createELEvaluatorForGroup(Configuration conf, String group) {
ELEvaluator eval = Services.get().get(ELService.class).createEvaluator(group);
setConfigToEval(eval, conf);
return eval;
}
/**
* Create a new Evaluator to resolve the EL functions and variables using action creation time (Phase 2)
*
* @param event : Xml element for data-in element usually enclosed by <data-in(out)> tag
* @param appInst : Application Instance related information such as Action creation Time
* @param conf :Configuration to substitute any variables
* @return configured ELEvaluator
* @throws Exception : If there is any date-time string in wrong format, the exception is thrown
*/
public static ELEvaluator createInstancesELEvaluator(Element event, SyncCoordAction appInst, Configuration conf)
throws Exception {
return createInstancesELEvaluator("coord-action-create", event, appInst, conf);
}
public static ELEvaluator createInstancesELEvaluator(String tag, Element event, SyncCoordAction appInst,
Configuration conf) throws Exception {
ELEvaluator eval = Services.get().get(ELService.class).createEvaluator(tag);
setConfigToEval(eval, conf);
SyncCoordDataset ds = getDSObject(event);
CoordELFunctions.configureEvaluator(eval, ds, appInst);
return eval;
}
public static ELEvaluator createELEvaluatorForDataEcho(Configuration conf, String group,
HashMap<String, String> dataNameList) throws Exception {
ELEvaluator eval = createELEvaluatorForGroup(conf, group);
for (Iterator<String> it = dataNameList.keySet().iterator(); it.hasNext();) {
String key = it.next();
String value = dataNameList.get(key);
eval.setVariable("oozie.dataname." + key, value);
}
return eval;
}
/**
* Create a new evaluator for Lazy resolve (phase 3). For example, coord_latest(n) and coord_actualTime()function
* should be resolved when all other data dependencies are met.
*
* @param actualTime : Action start time
* @param nominalTime : Action creation time
* @param dEvent :XML element for data-in element usually enclosed by <data-in(out)> tag
* @param conf :Configuration to substitute any variables
* @return configured ELEvaluator
* @throws Exception : If there is any date-time string in wrong format, the exception is thrown
*/
public static ELEvaluator createLazyEvaluator(Date actualTime, Date nominalTime, Element dEvent, Configuration conf)
throws Exception {
ELEvaluator eval = Services.get().get(ELService.class).createEvaluator("coord-action-start");
setConfigToEval(eval, conf);
SyncCoordDataset ds = getDSObject(dEvent);
SyncCoordAction appInst = new SyncCoordAction();
appInst.setNominalTime(nominalTime);
appInst.setActualTime(actualTime);
CoordELFunctions.configureEvaluator(eval, ds, appInst);
eval.setVariable(CoordELFunctions.CONFIGURATION, conf);
return eval;
}
/**
* Create a SLA evaluator to be used during Materialization
*
* @param nominalTime
* @param conf
* @return
* @throws Exception
*/
public static ELEvaluator createSLAEvaluator(Date nominalTime, Configuration conf) throws Exception {
ELEvaluator eval = Services.get().get(ELService.class).createEvaluator("coord-sla-create");
setConfigToEval(eval, conf);
SyncCoordAction appInst = new SyncCoordAction();// TODO:
appInst.setNominalTime(nominalTime);
CoordELFunctions.configureEvaluator(eval, null, appInst);
return eval;
}
/**
* Create an Evaluator to resolve dataIns and dataOuts of an application instance (used in stage 3)
*
* @param eJob : XML element for the application instance
* @param conf :Configuration to substitute any variables
* @return configured ELEvaluator
* @throws Exception : If there is any date-time string in wrong format, the exception is thrown
*/
public static ELEvaluator createDataEvaluator(Element eJob, Configuration conf, String actionId) throws Exception {
ELEvaluator e = Services.get().get(ELService.class).createEvaluator("coord-action-start");
setConfigToEval(e, conf);
SyncCoordAction appInst = new SyncCoordAction();
String strNominalTime = eJob.getAttributeValue("action-nominal-time");
if (strNominalTime != null) {
appInst.setNominalTime(DateUtils.parseDateUTC(strNominalTime));
appInst.setActionId(actionId);
appInst.setName(eJob.getAttributeValue("name"));
}
String strActualTime = eJob.getAttributeValue("action-actual-time");
if (strActualTime != null) {
appInst.setActualTime(DateUtils.parseDateUTC(strActualTime));
}
CoordELFunctions.configureEvaluator(e, null, appInst);
Element events = eJob.getChild("input-events", eJob.getNamespace());
if (events != null) {
for (Element data : (List<Element>) events.getChildren("data-in", eJob.getNamespace())) {
if (data.getChild("uris", data.getNamespace()) != null) {
String uris = data.getChild("uris", data.getNamespace()).getTextTrim();
uris = uris.replaceAll(CoordELFunctions.INSTANCE_SEPARATOR, CoordELFunctions.DIR_SEPARATOR);
e.setVariable(".datain." + data.getAttributeValue("name"), uris);
}
else {
}
if (data.getChild("unresolved-instances", data.getNamespace()) != null) {
e.setVariable(".datain." + data.getAttributeValue("name") + ".unresolved", "true"); // TODO:
// check
// null
}
}
}
events = eJob.getChild("output-events", eJob.getNamespace());
if (events != null) {
for (Element data : (List<Element>) events.getChildren("data-out", eJob.getNamespace())) {
if (data.getChild("uris", data.getNamespace()) != null) {
String uris = data.getChild("uris", data.getNamespace()).getTextTrim();
uris = uris.replaceAll(CoordELFunctions.INSTANCE_SEPARATOR, CoordELFunctions.DIR_SEPARATOR);
e.setVariable(".dataout." + data.getAttributeValue("name"), uris);
}
else {
}// TODO
if (data.getChild("unresolved-instances", data.getNamespace()) != null) {
e.setVariable(".dataout." + data.getAttributeValue("name") + ".unresolved", "true"); // TODO:
// check
// null
}
}
}
return e;
}
/**
* Create a new Evaluator to resolve URI temple with time specific constant
*
* @param strDate : Date-time
* @return configured ELEvaluator
* @throws Exception If there is any date-time string in wrong format, the exception is thrown
*/
public static ELEvaluator createURIELEvaluator(String strDate) throws Exception {
ELEvaluator eval = new ELEvaluator();
Calendar date = Calendar.getInstance(TimeZone.getTimeZone("UTC")); // TODO:UTC
// always???
date.setTime(DateUtils.parseDateUTC(strDate));
eval.setVariable("YEAR", date.get(Calendar.YEAR));
eval.setVariable("MONTH", make2Digits(date.get(Calendar.MONTH) + 1));
eval.setVariable("DAY", make2Digits(date.get(Calendar.DAY_OF_MONTH)));
eval.setVariable("HOUR", make2Digits(date.get(Calendar.HOUR_OF_DAY)));
eval.setVariable("MINUTE", make2Digits(date.get(Calendar.MINUTE)));
return eval;
}
/**
* Create Dataset object using the Dataset XML information
*
* @param eData
* @return
* @throws Exception
*/
private static SyncCoordDataset getDSObject(Element eData) throws Exception {
SyncCoordDataset ds = new SyncCoordDataset();
Element eDataset = eData.getChild("dataset", eData.getNamespace());
// System.out.println("eDATA :"+ XmlUtils.prettyPrint(eData));
Date initInstance = DateUtils.parseDateUTC(eDataset.getAttributeValue("initial-instance"));
ds.setInitInstance(initInstance);
if (eDataset.getAttributeValue("frequency") != null) {
int frequency = Integer.parseInt(eDataset.getAttributeValue("frequency"));
ds.setFrequency(frequency);
ds.setType("SYNC");
if (eDataset.getAttributeValue("freq_timeunit") == null) {
throw new RuntimeException("No freq_timeunit defined in data set definition\n"
+ XmlUtils.prettyPrint(eDataset));
}
ds.setTimeUnit(TimeUnit.valueOf(eDataset.getAttributeValue("freq_timeunit")));
if (eDataset.getAttributeValue("timezone") == null) {
throw new RuntimeException("No timezone defined in data set definition\n"
+ XmlUtils.prettyPrint(eDataset));
}
ds.setTimeZone(DateUtils.getTimeZone(eDataset.getAttributeValue("timezone")));
if (eDataset.getAttributeValue("end_of_duration") == null) {
throw new RuntimeException("No end_of_duration defined in data set definition\n"
+ XmlUtils.prettyPrint(eDataset));
}
ds.setEndOfDuration(TimeUnit.valueOf(eDataset.getAttributeValue("end_of_duration")));
Element doneFlagElement = eDataset.getChild("done-flag", eData.getNamespace());
String doneFlag = CoordUtils.getDoneFlag(doneFlagElement);
ds.setDoneFlag(doneFlag);
}
else {
ds.setType("ASYNC");
}
String name = eDataset.getAttributeValue("name");
ds.setName(name);
// System.out.println(name + " VAL "+ eDataset.getChild("uri-template",
// eData.getNamespace()));
String uriTemplate = eDataset.getChild("uri-template", eData.getNamespace()).getTextTrim();
ds.setUriTemplate(uriTemplate);
// ds.setTimeUnit(TimeUnit.MINUTES);
return ds;
}
/**
* Set all job configurations properties into evaluator.
*
* @param eval : Evaluator to set variables
* @param conf : configurations to set Evaluator
*/
private static void setConfigToEval(ELEvaluator eval, Configuration conf) {
for (Map.Entry<String, String> entry : conf) {
eval.setVariable(entry.getKey(), entry.getValue());
}
}
/**
* make any one digit number to two digit string pre-appending a"0"
*
* @param num : number to make sting
* @return :String of length at least two digit.
*/
private static String make2Digits(int num) {
String ret = "" + num;
if (num <= 9) {
ret = "0" + ret;
}
return ret;
}
}