Add Evacuation workers getter for G1 GC (#366)

Co-authored-by: Alina Hovakimyan <alinahovakimyan@Alinas-MacBook-Pro.local>

api/src/main/java/com/microsoft/gctoolkit/event/g1gc/G1Young.java

@@ -18,6 +18,8 @@ public class G1Young extends G1RealPause {
 
     private double parallelPhaseDuration = -1.0d;
     private int gcWorkers;
+    private int evacuationWorkersUsed;
+    private int evacuationWorkersAvailable;
     private double codeRootFixupDuration = -1.0d;
     private double codeRootMigrationDuration = -1.0d;
     private double codeRootPurgeDuration = -1.0d;
@@ -62,6 +64,14 @@ public void setGcWorkers(int count) {
         this.gcWorkers = count;
     }
 
+    public void setEvacuationWorkersUsed(int evacuationWorkersUsed) {
+        this.evacuationWorkersUsed = evacuationWorkersUsed;
+    }
+
+    public void setEvacuationWorkersAvailable(int evacuationWorkersAvailable) {
+        this.evacuationWorkersAvailable = evacuationWorkersAvailable;
+    }
+
     public void setCodeRootFixupDuration(double duration) {
         this.codeRootFixupDuration = duration;
     }
@@ -107,6 +117,14 @@ public int getGcWorkers() {
         return gcWorkers;
     }
 
+    public int getEvacuationWorkersUsed() {
+        return evacuationWorkersUsed;
+    }
+
+    public int getEvacuationWorkersAvailable() {
+        return evacuationWorkersAvailable;
+    }
+
     public double getCodeRootFixupDuration() {
         return codeRootFixupDuration;
     }

parser/src/main/java/com/microsoft/gctoolkit/parser/G1GCForwardReference.java

@@ -656,6 +656,11 @@ private void fillInPhases(G1Young collection) {
         postEvacuateCSetPhaseNames().forEach(name -> collection.addPostEvacuationCollectionPhase(name, postEvacuateCSetPhaseDuration(name)));
     }
 
+    private void fillInWorkers(G1Young collection) {
+        collection.setEvacuationWorkersUsed(evacuationWorkersUsed);
+        collection.setEvacuationWorkersAvailable(evacuationWorkersAvailable);
+    }
+
     private DateTimeStamp pausePhaseDuringConcurrentCycleTime = null;
     private double pausePhaseDuringConcurrentCycleDuration = -1.0d;
 
@@ -772,6 +777,7 @@ private G1Young buildYoung(G1Young collection) {
         fillInRegionSummary(collection);
         fillInMetaspaceStats(collection);
         fillInPhases(collection);
+        fillInWorkers(collection);
         if (toSpaceExhausted) collection.toSpaceExhausted();
         if (hasReferenceGCSummary())
             collection.add(generateReferenceGCSummary());