dionusos commented on a change in pull request #64:
URL: https://github.com/apache/oozie/pull/64#discussion_r783243124



##########
File path: core/src/main/java/org/apache/oozie/service/CallableQueueService.java
##########
@@ -872,4 +878,36 @@ public void insertCallableIntoInterruptMap(XCallable<?> 
callable) {
     public Set<String> getInterruptTypes() {
         return interruptTypes;
     }
+
+    public synchronized long getThreadActiveCount() {
+        return executor.getActiveCount();
+    }
+
+    public long getQueueThreadsNumber() {
+        return queueThreadsNumber;
+    }
+
+    public <T> Future<T> submit(CallableWrapper<T> task) throws 
InterruptedException {
+        return executor.submit((Callable<T>) task);
+    }
+
+    // refer to AbstractExecutorService.invokeAll
+    public <T> void blockingWait(List<Future<T>> futures) throws 
InterruptedException {
+        try {
+            for(Future f : futures) {

Review comment:
       Use Future<T> future: please.




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