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/*
* Copyright 2018 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.
*/
package io.hyperfoil.api.config;
import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import io.hyperfoil.api.statistics.StatisticsSnapshot;
public class SLA implements Serializable {
private final long window;
private final double errorRatio;
private final double invalidRatio;
private final long meanResponseTime;
private final double blockedRatio;
private final Collection limits;
public SLA(long window, double errorRatio, double invalidRatio, long meanResponseTime, double blockedRatio,
Collection limits) {
this.window = window;
this.meanResponseTime = meanResponseTime;
this.errorRatio = errorRatio;
this.invalidRatio = invalidRatio;
this.blockedRatio = blockedRatio;
this.limits = limits;
}
public long window() {
return window;
}
public double errorRatio() {
return errorRatio;
}
public double invalidRatio() {
return invalidRatio;
}
public long meanResponseTime() {
return meanResponseTime;
}
public double blockedRatio() {
return blockedRatio;
}
public Collection percentileLimits() {
return Collections.unmodifiableCollection(limits);
}
public SLA.Failure validate(String phase, String metric, StatisticsSnapshot statistics) {
double actualErrorRatio = (double) statistics.errors() / statistics.requestCount;
if (statistics.errors() > 0 && actualErrorRatio >= errorRatio) {
return new SLA.Failure(this, phase, metric, statistics.clone(),
String.format("Error ratio exceeded: required %.3f, actual %.3f", errorRatio, actualErrorRatio));
}
// Note: when a handler throws an exception the request is marked as invalid.
// However the response is not recorded (because we might not be finished reading the response).
// Therefore we rather compute the ration from requests to make sure invalid <= all.
double actualInvalidRatio = statistics.responseCount == 0 ? 0 : (double) statistics.invalid / statistics.requestCount;
if (statistics.invalid > 0 && actualInvalidRatio >= invalidRatio) {
return new SLA.Failure(this, phase, metric, statistics.clone(),
String.format("Invalid response ratio exceeded: required %.3f, actual %.3f", invalidRatio, actualInvalidRatio));
}
if (meanResponseTime < Long.MAX_VALUE) {
double mean = statistics.histogram.getMean();
if (mean >= meanResponseTime) {
return new SLA.Failure(this, phase, metric, statistics.clone(),
String.format("Mean response time exceeded: required %d, actual %.3f", meanResponseTime, mean));
}
}
if (statistics.blockedTime > 0) {
double actualBlockedRatio = statistics.blockedTime
/ (statistics.blockedTime + statistics.histogram.getMean() * statistics.histogram.getTotalCount());
if (actualBlockedRatio > blockedRatio) {
return new SLA.Failure(this, phase, metric, statistics.clone(),
String.format("Progress was blocked waiting for a free connection. Hint: increase http.sharedConnections."));
}
}
for (SLA.PercentileLimit limit : limits) {
long value = statistics.histogram.getValueAtPercentile(limit.percentile());
if (value >= limit.responseTime()) {
return new SLA.Failure(this, phase, metric, statistics.clone(),
String.format("Response time at percentile %f exceeded: required %d, actual %d", limit.percentile,
limit.responseTime, value));
}
}
return null;
}
public static class PercentileLimit implements Serializable {
private final double percentile;
private final long responseTime;
public PercentileLimit(double percentile, long responseTime) {
this.percentile = percentile;
this.responseTime = responseTime;
}
public double percentile() {
return percentile;
}
/**
* @return Maximum allowed response time for given percentile, in nanoseconds.
*/
public long responseTime() {
return responseTime;
}
}
public static class Failure {
private final SLA sla;
private final String phase;
private final String metric;
private final StatisticsSnapshot statistics;
private final String message;
public Failure(SLA sla, String phase, String metric, StatisticsSnapshot statistics, String message) {
this.sla = sla;
this.phase = phase;
this.metric = metric;
this.statistics = statistics;
this.message = message;
}
public SLA sla() {
return sla;
}
public String phase() {
return phase;
}
public String metric() {
return metric;
}
public StatisticsSnapshot statistics() {
return statistics;
}
public String message() {
return message;
}
}
public interface Provider extends Step {
/**
* @return Step ID that will allow us to match against the SLA.
*/
int id();
SLA[] sla();
}
}
