+/*
+ * ============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 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() {
+ System.gc();
+ memoryUsedBefore = getCurrentMemoryUsage();
+ stopWatch.start();
+ }
+
+ /**
+ * Stop measurement.
+ */
+ public void stop() {
+ stopWatch.stop();
+ memoryUsedAfter = getCurrentMemoryUsage();
+ }
+
+ /**
+ * Get the total time in milliseconds.
+ * @return total time in milliseconds
+ */
+ public long getTotalTimeMillis() {
+ return stopWatch.getTotalTimeMillis();
+ }
+
+ /**
+ * Get the total memory used in megabytes.
+ * @return total memory used in megabytes
+ */
+ public double getTotalMemoryUsageInMB() {
+ return (memoryUsedAfter - memoryUsedBefore) / 1_000_000.0;
+ }
+
+ private static long getCurrentMemoryUsage() {
+ return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
+ }
+}
+