Partial implementation

nflow-engine/src/main/java/com/nitorcreations/nflow/engine/workflow/statistics/Statistics.java

@@ -0,0 +1,24 @@
+package com.nitorcreations.nflow.engine.workflow.statistics;
+
+public class Statistics {
+
+  public final QueueStatistics queuedStatistics;
+  public final QueueStatistics executionStatistics;
+
+  public Statistics(QueueStatistics queuedStatistics, QueueStatistics executionStatistics) {
+    this.queuedStatistics = queuedStatistics;
+    this.executionStatistics = executionStatistics;
+  }
+
+  public static class QueueStatistics {
+    public final int count;
+    public final Long maxAgeMsec;
+    public final Long minAgeMsec;
+
+    public QueueStatistics(int count, Long maxAgeMsec, Long minAgeMsec) {
+      this.count = count;
+      this.maxAgeMsec = maxAgeMsec;
+      this.minAgeMsec = minAgeMsec;
+    }
+  }
+}