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*
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package org.glassfish.jersey.server.internal.monitoring;
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.TimeUnit;
import org.glassfish.jersey.server.monitoring.TimeWindowStatistics;
/**
* {@link TimeWindowStatistics Time window statistics} implementation.
*
* @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
*/
public class TimeWindowStatisticsImpl implements TimeWindowStatistics {
/**
* Builder of time window statistics.
*/
static class Builder {
private static final int DEFAULT_UNITS_PER_INTERVAL = 100;
private static final int MINIMUM_UNIT_SIZE = 1000;
private final long interval;
private final long unit;
private final int unitsPerInterval;
private final long startTime;
private final Queue unitQueue;
private long totalCount;
private long totalDuration;
private final long intervalWithRoundError;
private long lastUnitEnd;
private long lastUnitCount;
private long lastUnitMin = -1;
private long lastUnitMax = -1;
private long lastUnitDuration = 0;
private static class Unit {
private final long count;
private final long minimumDuration;
private final long maximumDuration;
private final long duration;
private Unit(long count, long minimumDuration, long maximumDuration, long duration) {
this.count = count;
this.minimumDuration = minimumDuration;
this.maximumDuration = maximumDuration;
this.duration = duration;
}
private static Unit EMPTY_UNIT = new Unit(0, -1, -1, 0);
}
/**
* Create a new builder instance.
* @param timeWindowSize Size of time window.
* @param timeUnit Time units of {@code timeWindowSize}.
*/
Builder(long timeWindowSize, TimeUnit timeUnit) {
this(timeWindowSize, timeUnit, System.currentTimeMillis());
}
/**
* Create a new builder instance. A constructor is used mainly for testing purposes.
* @param timeWindowSize Size of time window.
* @param timeUnit Time units of {@code timeWindowSize}.
* @param now Current time.
*/
Builder(long timeWindowSize, TimeUnit timeUnit, long now) {
startTime = now;
this.interval = timeUnit.toMillis(timeWindowSize);
if (interval == 0) {
// unlimited timeWindowSize
unit = 0;
unitsPerInterval = 0;
intervalWithRoundError = 0;
unitQueue = null;
} else {
int n = DEFAULT_UNITS_PER_INTERVAL;
long u = interval / n;
if (u < 1000) {
n = (int) interval / 1000;
u = interval / n;
}
this.unit = u;
this.unitsPerInterval = n;
intervalWithRoundError = unit * unitsPerInterval;
this.unitQueue = new LinkedList();
lastUnitEnd = startTime + unit;
}
}
/**
* Add request execution.
* @param requestTime Time of execution.
* @param duration Duration of request processing.
*/
void addRequest(long requestTime, long duration) {
closeLastUnitIfNeeded(requestTime);
lastUnitCount++;
lastUnitDuration += duration;
if (duration < lastUnitMin || lastUnitMin == -1) {
lastUnitMin = duration;
}
if (duration > lastUnitMax || lastUnitMax == -1) {
lastUnitMax = duration;
}
}
private void closeLastUnitIfNeeded(long requestTime) {
if (interval != 0) {
if ((requestTime - lastUnitEnd) > interval + unit) {
resetQueue(requestTime);
}
if (lastUnitEnd < requestTime) {
// close the old unit
add(new Unit(lastUnitCount, lastUnitMin, lastUnitMax, lastUnitDuration));
lastUnitEnd += unit;
resetLastUnit();
while (lastUnitEnd < requestTime) {
add(Unit.EMPTY_UNIT);
lastUnitEnd += unit;
}
}
}
}
private void resetLastUnit() {
lastUnitCount = 0;
lastUnitMin = -1;
lastUnitMax = -1;
lastUnitDuration = 0;
}
private void add(Unit unit) {
unitQueue.add(unit);
// fill with empty until units
if (unitQueue.size() > unitsPerInterval) {
final Unit removedUnit = unitQueue.remove();
totalCount -= removedUnit.count;
totalDuration -= removedUnit.duration;
}
totalCount += lastUnitCount;
totalDuration += lastUnitDuration;
}
private void resetQueue(long requestTime) {
this.unitQueue.clear();
lastUnitEnd = requestTime + unit;
resetLastUnit();
// fill with empty unit to keep result consistent
for (int i = 0; i < unitsPerInterval; i++) {
unitQueue.add(Unit.EMPTY_UNIT);
}
}
/**
* Build the time window statistics instance.
*
* @return New instance of statistics.
*/
TimeWindowStatisticsImpl build() {
return build(System.currentTimeMillis());
}
/**
* Build the time window statistics instance.
*
* @param currentTime Current time as a reference to which the statistics should be built.
* @return New instance of statistics.
*/
TimeWindowStatisticsImpl build(long currentTime) {
if (interval == 0) {
final long diff = currentTime - startTime;
if (diff < MINIMUM_UNIT_SIZE) {
return new TimeWindowStatisticsImpl(interval, 0, 0, 0, 0, 0);
} else {
double requestsPerSecond = (double) (1000 * lastUnitCount) / diff;
long avg = lastUnitCount == 0 ? -1 : lastUnitDuration / lastUnitCount;
return new TimeWindowStatisticsImpl(interval, requestsPerSecond, lastUnitMin, lastUnitMax, avg, lastUnitCount);
}
}
closeLastUnitIfNeeded(currentTime);
long min = -1;
long max = -1;
double requestsPerSecond;
for (final Unit u : this.unitQueue) {
if ((u.minimumDuration < min && u.minimumDuration != -1) || min == -1) {
min = u.minimumDuration;
}
if ((u.maximumDuration > max && u.maximumDuration != -1) || max == -1) {
max = u.maximumDuration;
}
}
final int size = unitQueue.size();
if (size >= unitsPerInterval) {
// intervalWithRoundError is used instead of size * unit for performance reasons
requestsPerSecond = (double) (1000 * totalCount) / intervalWithRoundError;
} else {
requestsPerSecond = size == 0 ? 0d : (double) (1000 * totalCount) / (size * unit);
}
long avg = totalCount == 0 ? -1 : totalDuration / totalCount;
return new TimeWindowStatisticsImpl(interval, requestsPerSecond, min, max, avg, totalCount);
}
public long getInterval() {
return interval;
}
}
private final long interval;
private final double requestsPerSecond;
private final long minimumDuration;
private final long maximumDuration;
private final long averageDuration;
private long totalCount;
private TimeWindowStatisticsImpl(long interval, double requestsPerSecond, long minimumDuration,
long maximumDuration, long averageDuration, long totalCount) {
this.interval = interval;
this.requestsPerSecond = requestsPerSecond;
this.minimumDuration = minimumDuration;
this.maximumDuration = maximumDuration;
this.averageDuration = averageDuration;
this.totalCount = totalCount;
}
@Override
public long getTimeWindow() {
return interval;
}
@Override
public double getRequestsPerSecond() {
return requestsPerSecond;
}
@Override
public long getMinimumDuration() {
return minimumDuration;
}
@Override
public long getMaximumDuration() {
return maximumDuration;
}
@Override
public long getRequestCount() {
return totalCount;
}
@Override
public TimeWindowStatistics snapshot() {
// snapshot functionality not yet implemented
return this;
}
@Override
public long getAverageDuration() {
return averageDuration;
}
}
