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/*
* ============LICENSE_START==============================================
* Copyright (c) 2019 AT&T Intellectual Property.
* =======================================================================
* 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.
* ============LICENSE_END=================================================
*
*/
package org.onap.optf.cmso.optimizer.availability.timewindows;
import com.google.ical.compat.jodatime.DateTimeIterator;
import com.google.ical.compat.jodatime.DateTimeIteratorFactory;
import java.text.ParseException;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.OffsetTime;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.onap.observations.Observation;
import org.onap.optf.cmso.optimizer.availability.policies.model.AllowedPeriodicTime;
import org.onap.optf.cmso.optimizer.availability.policies.model.TimeLimitAndVerticalTopology;
import org.onap.optf.cmso.optimizer.availability.policies.model.TimeRange;
import org.onap.optf.cmso.optimizer.common.LogMessages;
import org.onap.optf.cmso.optimizer.service.rs.models.ChangeWindow;
/**
* The Class RecurringWindows.
*/
public class RecurringWindows {
/**
* Gets the availability windows for policies.
*
* @param policies the policies
* @param changeWindow the change window
* @return the availability windows for policies
*/
public static List<ChangeWindow> getAvailabilityWindowsForPolicies(List<TimeLimitAndVerticalTopology> policies,
ChangeWindow changeWindow) {
List<ChangeWindow> availableList = new ArrayList<>();
for (TimeLimitAndVerticalTopology policy : policies) {
if (policy.getTimeSchedule() != null && policy.getTimeSchedule().getAllowedPeriodicTime() != null) {
for (AllowedPeriodicTime available : policy.getTimeSchedule().getAllowedPeriodicTime()) {
getAvailableWindowsForApt(available, changeWindow, availableList);
}
}
}
// Collapse all duplicate and overlapping availabity windows into minimum
// number of windows
availableList = collapseWindows(availableList);
return availableList;
}
private static List<ChangeWindow> collapseWindows(List<ChangeWindow> availableList) {
List<ChangeWindow> collapsed = new ArrayList<>();
Set<ChangeWindow> consumed = new HashSet<>();
for (ChangeWindow win : availableList) {
if (!consumed.contains(win)) {
// Find all windows that can collapse into this one
consumed.add(win);
boolean allUnique = false;
while (!allUnique) {
allUnique = true;
for (ChangeWindow test : availableList) {
// if availability windows overlap
if (!consumed.contains(test)) {
if (win.absorbIfOverlapping(test)) {
consumed.add(test);
allUnique = false;
}
}
}
}
collapsed.add(win);
}
}
return collapsed;
}
// "RRULE:FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR",
private static void getAvailableWindowsForApt(AllowedPeriodicTime available, ChangeWindow changeWindow,
List<ChangeWindow> availableList) {
if (available.getDay() != null) {
switch (available.getDay()) {
case weekday:
case weekend:
getAvailableWindowsForAptDay(available, changeWindow, availableList);
return;
default:
}
}
availableList.add(changeWindow);
Observation.report(LogMessages.UNSUPPORTED_PERIODIC_TIME, available.toString());
}
// "RRULE:FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR",
private static void getAvailableWindowsForAptDay(AllowedPeriodicTime available, ChangeWindow changeWindow,
List<ChangeWindow> availableList) {
try {
List<TimeRange> ranges = available.getTimeRange();
if (ranges.size() == 0) {
TimeRange range = new TimeRange();
range.setStartTime("00:00:00+00:00");
range.setEndTime("23:59:59+00:00");
ranges.add(range);
}
StringBuilder rdata = new StringBuilder();
rdata.append(available.getDay().getRrule()).append("\n");
for (TimeRange range : ranges) {
processRange(range, changeWindow, availableList, rdata);
}
} catch (Exception e) {
Observation.report(LogMessages.UNEXPECTED_EXCEPTION, e, e.getMessage());
}
}
private static void processRange(TimeRange range, ChangeWindow changeWindow, List<ChangeWindow> availableList,
StringBuilder rdata) throws ParseException {
Instant cwStartInstant = changeWindow.getStartTime().toInstant();
Instant cwEndInstant = changeWindow.getEndTime().toInstant();
List<DateTime> startList = getRecurringList(range.getStartTime(), cwStartInstant, rdata, cwEndInstant, -1);
List<DateTime> endList = getRecurringList(range.getEndTime(), cwStartInstant,
rdata, cwEndInstant, startList.size());
// Pair them up to make change windows
// Everything should be UTC time
for (int i = 0; i < startList.size(); i++) {
DateTime startDt = startList.get(i);
if (i < endList.size()) {
DateTime endDt = endList.get(i);
if (endDt.isAfter(startDt)) {
ChangeWindow cw = new ChangeWindow();
cw.setStartTime(startDt.toDate());
cw.setEndTime(endDt.toDate());
availableList.add(cw);
}
}
}
}
private static List<DateTime> getRecurringList(String rangeTime, Instant cwStartInstant, StringBuilder rdata,
Instant cwEndInstant, int endingSize) throws ParseException {
Instant startInstant = getInstanceFromTime(rangeTime, cwStartInstant);
DateTime start = new DateTime(startInstant.toEpochMilli());
DateTimeIterator recur =
DateTimeIteratorFactory.createDateTimeIterator(rdata.toString(), start, DateTimeZone.UTC, true);
List<DateTime> list = new ArrayList<>();
while (recur.hasNext()) {
DateTime next = recur.next();
// System.out.println(next.toString());
if (endingSize == -1) {
if (next.isAfter(cwEndInstant.toEpochMilli())) {
break;
}
}
else {
if (list.size() == endingSize) {
break;
}
}
list.add(next);
}
return list;
}
//
// The policies with 'Day' enumeration only have time with no day so we add the
// date portion of the change window to the dtstart
//
private static Instant getInstanceFromTime(String timeIn, Instant cwStartInstant) {
Instant instant = null;
Instant date = cwStartInstant.truncatedTo(ChronoUnit.DAYS);
LocalDate epoch = LocalDate.ofEpochDay(0);
try {
OffsetTime offset = OffsetTime.parse(timeIn);
OffsetDateTime odt = offset.atDate(epoch);
ZonedDateTime startTime = odt.atZoneSameInstant(ZoneOffset.UTC.normalized());
instant = Instant.from(startTime);
} catch (Exception e) {
LocalTime local = LocalTime.parse(timeIn);
LocalDateTime ldt = local.atDate(epoch);
ZonedDateTime startTime = ldt.atZone(ZoneOffset.UTC.normalized());
instant = Instant.from(startTime);
}
return instant.plus(date.toEpochMilli(), ChronoUnit.MILLIS);
}
/**
* Gets the recurring list for change window.
*
* @param window the window
* @param durationInSeconds the duration in seconds
* @return the recurring list for change window
* @throws ParseException the parse exception
*/
public static DateTimeIterator getRecurringListForChangeWindow(ChangeWindow window, Long durationInSeconds)
throws ParseException {
String rdata = "RRULE:FREQ=MINUTELY;INTERVAL=" + durationInSeconds / 60;
DateTime start = new DateTime(window.getStartTime().toInstant().toEpochMilli());
DateTimeIterator recur =
DateTimeIteratorFactory.createDateTimeIterator(rdata, start, DateTimeZone.UTC, true);
return recur;
}
}
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