Use deque as stack

1 files changed, 23 insertions, 0 deletions

diff --git a/zkfacade/src/test/java/com/yahoo/vespa/curator/stats/LockTest.java b/zkfacade/src/test/java/com/yahoo/vespa/curator/stats/LockTest.java
index 4b9b6a4429b..984a04c6d4e 100644
--- a/zkfacade/src/test/java/com/yahoo/vespa/curator/stats/LockTest.java
+++ b/zkfacade/src/test/java/com/yahoo/vespa/curator/stats/LockTest.java
@@ -110,4 +110,27 @@ public class LockTest {
         expectedCounters.locksReleasedCount.set(2);
         assertEquals(Map.of(lockPath, expectedCounters), ThreadLockInfo.getLockCountersByPath());
     }
+
+    @Test
+    public void nestedLocks() throws Exception {
+        when(mutex.acquire(anyLong(), any())).thenReturn(true);
+
+        String lockPath2 = "/lock/path/2";
+        Lock lock2 = new Lock(lockPath2, mutex);
+
+        lock.acquire(acquireTimeout);
+        lock2.acquire(acquireTimeout);
+
+        List<ThreadLockInfo> threadLockInfos = ThreadLockInfo.getThreadLockInfos();
+        assertEquals(1, threadLockInfos.size());
+        List<LockInfo> lockInfos = threadLockInfos.get(0).getLockInfos();
+        assertEquals(2, lockInfos.size());
+        assertEquals(lockPath, lockInfos.get(0).getLockPath());
+        assertEquals(LockInfo.LockState.ACQUIRED, lockInfos.get(0).getLockState());
+        assertEquals(lockPath2, lockInfos.get(1).getLockPath());
+        assertEquals(LockInfo.LockState.ACQUIRED, lockInfos.get(1).getLockState());
+
+        lock.close();
+        lock.close();
+    }
 }