jchen21 commented on a change in pull request #5536:
URL: https://github.com/apache/geode/pull/5536#discussion_r493856692
##########
File path:
geode-core/src/main/java/org/apache/geode/management/internal/beans/stats/GCStatsMonitor.java
##########
@@ -39,69 +39,71 @@
* @see org.apache.geode.management.internal.beans.stats.MBeanStatsMonitor
*/
public class GCStatsMonitor extends MBeanStatsMonitor {
+ // this class uses these volatile variables to make sure reads are reading
the latest values
+ // it is not using the parent's siteMap which is not volatile to keep the
stats values.
private volatile long collections = 0;
private volatile long collectionTime = 0;
- long getCollections() {
- return collections;
- }
-
- long getCollectionTime() {
- return collectionTime;
- }
-
public GCStatsMonitor(String name) {
super(name);
}
- void decreasePrevValues(Map<String, Number> statsMap) {
- collections -= statsMap.getOrDefault(StatsKey.VM_GC_STATS_COLLECTIONS,
0).longValue();
- collectionTime -=
statsMap.getOrDefault(StatsKey.VM_GC_STATS_COLLECTION_TIME, 0).longValue();
- }
-
- void increaseStats(String name, Number value) {
- if (name.equals(StatsKey.VM_GC_STATS_COLLECTIONS)) {
- collections += value.longValue();
- return;
- }
-
- if (name.equals(StatsKey.VM_GC_STATS_COLLECTION_TIME)) {
- collectionTime += value.longValue();
- return;
+ @Override
+ // this will be called multiple times with different collector's stats
+ public void addStatisticsToMonitor(Statistics stats) {
Review comment:
The `addStatisticsToMonitor` method ignores the descriptors other than
`VM_GC_STATS_COLLECTIONS` and `VM_GC_STATS_COLLECTION_TIME`. Can we guarantee
that there is no other descriptor?
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