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/**
* ============LICENSE_START===================================================
* SPARKY (AAI UI service)
* ============================================================================
* Copyright © 2017 AT&T Intellectual Property.
* Copyright © 2017 Amdocs
* 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.
* ============LICENSE_END=====================================================
*
* ECOMP and OpenECOMP are trademarks
* and service marks of AT&T Intellectual Property.
*/
package org.openecomp.sparky.synchronizer;
import java.util.concurrent.atomic.AtomicInteger;
import org.openecomp.sparky.analytics.AveragingRingBuffer;
import org.openecomp.sparky.synchronizer.config.TaskProcessorConfig;
/**
* TODO: Fill in description.
*
* @author davea.
*/
public class TransactionRateController {
private AveragingRingBuffer responseTimeTracker;
private double msPerTransaction;
private int numThreads;
private TaskProcessorConfig config;
private long startTimeInMs;
private AtomicInteger numTransactions;
/**
* Instantiates a new transaction rate controller.
*
* @param config the config
*/
public TransactionRateController(TaskProcessorConfig config) {
this.config = config;
this.responseTimeTracker = new AveragingRingBuffer(
config.getNumSamplesPerThreadForRunningAverage() * config.getMaxConcurrentWorkers());
this.msPerTransaction = 1000 / config.getTargetTps();
this.numThreads = config.getMaxConcurrentWorkers();
this.startTimeInMs = System.currentTimeMillis();
this.numTransactions = new AtomicInteger(0);
}
/**
* Track response time.
*
* @param responseTimeInMs the response time in ms
*/
public void trackResponseTime(long responseTimeInMs) {
this.numTransactions.incrementAndGet();
responseTimeTracker.addSample(responseTimeInMs);
}
public long getFixedDelayInMs() {
/*
* The math here is pretty simple:
*
* 1. Target TPS is 10. Then the msPerTxn = 1000/10 = 100ms
*
* 2. If the calculated avgResponseTime = 40 ms, then the proposed delay is 60ms per thread.
*
* 3. If the calculated avgResponseTime = 200ms, then the proposed delay is -100 ms, which is
* not possible, we can't speed it up, so we don't propose any further delay.
*/
double proposedDelay = 0;
if (config.isTransactionRateControllerEnabled()) {
proposedDelay = ((msPerTransaction - responseTimeTracker.getAvg()) * this.numThreads);
if (proposedDelay > 0) {
return (long) (proposedDelay);
}
}
return (long) proposedDelay;
}
public long getAvg() {
return responseTimeTracker.getAvg();
}
public double getCurrentTps() {
if (numTransactions.get() > 0) {
double timeDelta = System.currentTimeMillis() - startTimeInMs;
double numTxns = numTransactions.get();
return (numTxns / timeDelta) * 1000.0;
}
return 0.0;
}
}
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