[tensorflow] Revert InstanceHolder for TensorFlow engine (deepjavalib…

…rary#2884)
zachgk · Dec 4, 2023 · 586bb07 · 586bb07
1 parent 2fc8058
commit 586bb07
Showing 1 changed file with 10 additions and 5 deletions.
diff --git a/...tensorflow/tensorflow-engine/src/main/java/ai/djl/tensorflow/engine/TfEngineProvider.java b/...tensorflow/tensorflow-engine/src/main/java/ai/djl/tensorflow/engine/TfEngineProvider.java
@@ -18,6 +18,8 @@
 /** {@code TfEngineProvider} is the TensorFlow implementation of {@link EngineProvider}. */
 public class TfEngineProvider implements EngineProvider {
 
+    private static volatile Engine engine; // NOPMD
+
     /** {@inheritDoc} */
     @Override
     public String getEngineName() {
@@ -33,10 +35,13 @@ public int getEngineRank() {
     /** {@inheritDoc} */
     @Override
     public Engine getEngine() {
-        return InstanceHolder.INSTANCE;
-    }
-
-    private static class InstanceHolder {
-        static final Engine INSTANCE = TfEngine.newInstance();
+        if (engine == null) {
+            synchronized (TfEngineProvider.class) {
+                if (engine == null) {
+                    engine = TfEngine.newInstance();
+                }
+            }
+        }
+        return engine;
     }
 }