/**
* Combines the metrics from multiple metrics objects into a single one. If a metric appears in
* more than one metric object the first metric value found is used.
*/
public static PerfMetrics combine(PerfMetrics... metricsList) {
PerfMetrics combined = null;
List<JSONObject> devToolsLog = null;
Map<String, ?> jsProfilerData = null;
Map<String, ?> heapSnapshot = null;
for (PerfMetrics metrics : metricsList) {
if (metrics != null) {
if (devToolsLog == null) {
devToolsLog = metrics.getDevToolsLog();
}
if (jsProfilerData == null) {
jsProfilerData = metrics.getJSProfilerData();
}
if (heapSnapshot == null) {
heapSnapshot = metrics.getHeapSnapshot();
}
if (combined == null) {
// so we return null if all metrics in metricsList are null
combined = new PerfMetrics();
}
for (String name : metrics.getAllMetricNames()) {
if (!combined.hasMetric(name)) {
combined.setMetric(metrics.getMetric(name));
}
}
}
}
if (combined != null) {
combined.setDevToolsLog(devToolsLog);
combined.setJSProfilerData(jsProfilerData);
combined.setHeapSnapshot(heapSnapshot);
}
return combined;
}
