package org.glassfish.jersey.server.internal.monitoring;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.glassfish.jersey.server.internal.monitoring.core.UniformTimeReservoir;
import org.glassfish.jersey.server.monitoring.ExecutionStatistics;
import org.glassfish.jersey.server.monitoring.TimeWindowStatistics;
final class ExecutionStatisticsImpl implements ExecutionStatistics {
static final ExecutionStatistics EMPTY = new Builder().build();
static class Builder {
private volatile long lastStartTime;
private final Map<Long, TimeWindowStatisticsImpl.Builder> intervalStatistics;
private final Collection<TimeWindowStatisticsImpl.Builder<Long>> updatableIntervalStatistics;
@SuppressWarnings("MagicNumber")
public Builder() {
final long nowMillis = System.currentTimeMillis();
final AggregatingTrimmer trimmer = new AggregatingTrimmer(nowMillis, TimeUnit.MILLISECONDS, 1, TimeUnit.SECONDS);
final TimeWindowStatisticsImpl.Builder<Long> oneSecondIntervalWindowBuilder =
new TimeWindowStatisticsImpl.Builder<>(
new SlidingWindowTimeReservoir(1, TimeUnit.SECONDS, nowMillis, TimeUnit.MILLISECONDS, trimmer));
final TimeWindowStatisticsImpl.Builder<Long> infiniteIntervalWindowBuilder =
new TimeWindowStatisticsImpl.Builder<>(new UniformTimeReservoir(nowMillis, TimeUnit.MILLISECONDS));
this.updatableIntervalStatistics =
Arrays.asList(infiniteIntervalWindowBuilder, oneSecondIntervalWindowBuilder);
final HashMap<Long, TimeWindowStatisticsImpl.Builder> tmpIntervalStatistics = new HashMap<>(6);
tmpIntervalStatistics.put(0L, infiniteIntervalWindowBuilder);
tmpIntervalStatistics.put(TimeUnit.SECONDS.toMillis(1), oneSecondIntervalWindowBuilder);
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 15, TimeUnit.SECONDS, trimmer);
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 1, TimeUnit.MINUTES, trimmer);
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 15, TimeUnit.MINUTES, trimmer);
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 1, TimeUnit.HOURS, trimmer);
this.intervalStatistics = Collections.unmodifiableMap(tmpIntervalStatistics);
}
private static void addAggregatedInterval(
final Map<Long, TimeWindowStatisticsImpl.Builder> intervalStatisticsMap,
final long nowMillis,
final long interval,
final TimeUnit timeUnit,
final AggregatingTrimmer notifier) {
final long intervalInMillis = timeUnit.toMillis(interval);
intervalStatisticsMap.put(intervalInMillis, new TimeWindowStatisticsImpl.Builder<>(
new AggregatedSlidingWindowTimeReservoir(intervalInMillis, TimeUnit.MILLISECONDS, nowMillis,
TimeUnit.MILLISECONDS, notifier)));
}
void addExecution(final long startTime, final long duration) {
for (final TimeWindowStatisticsImpl.Builder<Long> statBuilder : updatableIntervalStatistics) {
statBuilder.addRequest(startTime, duration);
}
this.lastStartTime = startTime;
}
public ExecutionStatisticsImpl build() {
final Map<Long, TimeWindowStatistics> newIntervalStatistics = new HashMap<>();
for (final Map.Entry<Long, TimeWindowStatisticsImpl.Builder> builderEntry : intervalStatistics.entrySet()) {
newIntervalStatistics.put(builderEntry.getKey(), builderEntry.getValue().build());
}
return new ExecutionStatisticsImpl(lastStartTime, newIntervalStatistics);
}
}
private final long lastStartTime;
private final Map<Long, TimeWindowStatistics> timeWindowStatistics;
@Override
public Date getLastStartTime() {
return new Date(lastStartTime);
}
@Override
public Map<Long, TimeWindowStatistics> getTimeWindowStatistics() {
return timeWindowStatistics;
}
@Override
public ExecutionStatistics snapshot() {
return this;
}
private ExecutionStatisticsImpl(final long lastStartTime, final Map<Long, TimeWindowStatistics> timeWindowStatistics) {
this.lastStartTime = lastStartTime;
this.timeWindowStatistics = Collections.unmodifiableMap(timeWindowStatistics);
}
}