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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2023 Nordix Foundation
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.integration;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryType;
import org.springframework.util.StopWatch;
/**
* Time and memory stop watch, exposing total running time and memory used.
*/
public class ResourceMeter {
private final StopWatch stopWatch = new StopWatch();
private long memoryUsedBefore;
private long memoryUsedAfter;
/**
* Start measurement.
*/
public void start() {
performGcAndWait();
resetPeakHeapUsage();
memoryUsedBefore = getPeakHeapUsage();
stopWatch.start();
}
/**
* Stop measurement.
*/
public void stop() {
stopWatch.stop();
memoryUsedAfter = getPeakHeapUsage();
}
/**
* Get the total time in seconds.
* @return total time in seconds
*/
public double getTotalTimeInSeconds() {
return stopWatch.getTotalTimeSeconds();
}
/**
* Get the total memory used in megabytes.
* @return total memory used in megabytes
*/
public double getTotalMemoryUsageInMB() {
return (memoryUsedAfter - memoryUsedBefore) / 1_000_000.0;
}
static void performGcAndWait() {
final long gcCountBefore = getGcCount();
System.gc();
while (getGcCount() == gcCountBefore) {}
}
private static long getGcCount() {
return ManagementFactory.getGarbageCollectorMXBeans().stream()
.mapToLong(GarbageCollectorMXBean::getCollectionCount)
.filter(gcCount -> gcCount != -1)
.sum();
}
private static long getPeakHeapUsage() {
return ManagementFactory.getMemoryPoolMXBeans().stream()
.filter(pool -> pool.getType() == MemoryType.HEAP)
.mapToLong(pool -> pool.getPeakUsage().getUsed())
.sum();
}
private static void resetPeakHeapUsage() {
ManagementFactory.getMemoryPoolMXBeans().stream()
.filter(pool -> pool.getType() == MemoryType.HEAP)
.forEach(MemoryPoolMXBean::resetPeakUsage);
}
}
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