NSAmelchev commented on a change in pull request #7446: IGNITE-12464 : Service
metrics
URL: https://github.com/apache/ignite/pull/7446#discussion_r400438477
##########
File path:
modules/core/src/main/java/org/apache/ignite/internal/processors/service/IgniteServiceProcessor.java
##########
@@ -1801,4 +1842,176 @@ private boolean enterBusy() {
private void leaveBusy() {
opsLock.readLock().unlock();
}
+
+ /**
+ * Registers metrics to measure durations of service methods.
+ *
+ * @param srvc Service for invocations measurement.
+ * @param srvcName Name of {@code srvc}.
+ */
+ private void registerMetrics(Service srvc, String srvcName) {
+
getInterfaces(srvc.getClass()).stream().map(Class::getMethods).flatMap(Arrays::stream)
+ .filter(mtd -> !isMetricIgnoredFor(mtd.getDeclaringClass()))
+ .forEach(mtd -> {
+ // All metrics for current service.
+ Map<String, MethodHistogramHolder> srvcHistograms =
+ invocationHistograms.computeIfAbsent(srvcName, name -> new
HashMap<>(1));
Review comment:
`ConcurrentHashMap` should be used. Otherwise, it's possible to get the
exception here:
```
java.lang.ClassCastException: java.util.HashMap$Node cannot be cast to
java.util.HashMap$TreeNode
at java.util.HashMap$TreeNode.moveRootToFront(HashMap.java:1835)
at java.util.HashMap$TreeNode.treeify(HashMap.java:1951)
at java.util.HashMap.treeifyBin(HashMap.java:772)
at java.util.HashMap.computeIfAbsent(HashMap.java:1140)
```
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