Adding a hook for loading TF IO native libraries (tensorflow#468)

Author: Craigacp

tensorflow-core/tensorflow-core-api/src/main/java/org/tensorflow/TensorFlow.java

@@ -1,4 +1,4 @@
-/* Copyright 2019-2021 The TensorFlow Authors. All Rights Reserved.
+/* Copyright 2019-2022 The TensorFlow Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@
 import static org.tensorflow.internal.c_api.global.tensorflow.TF_GetAllOpList;
 import static org.tensorflow.internal.c_api.global.tensorflow.TF_GetOpList;
 import static org.tensorflow.internal.c_api.global.tensorflow.TF_LoadLibrary;
+import static org.tensorflow.internal.c_api.global.tensorflow.TF_RegisterFilesystemPlugin;
 import static org.tensorflow.internal.c_api.global.tensorflow.TF_Version;
 
 import com.google.protobuf.InvalidProtocolBufferException;
@@ -108,6 +109,21 @@ public static OpList loadLibrary(String filename) {
     }
   }
 
+  /**
+   * Loads the filesystem plugin from filename and registers all the filesystems it supports.
+   *
+   * <p>Throws a TF runtime exception if the plugin failed to load.
+   *
+   * @param filename Path of the dynamic library containing the filesystem support.
+   */
+  public static void registerFilesystemPlugin(String filename) {
+    try (PointerScope scope = new PointerScope()) {
+      TF_Status status = TF_Status.newStatus();
+      TF_RegisterFilesystemPlugin(filename, status);
+      status.throwExceptionIfNotOK();
+    }
+  }
+
   private static TF_Library libraryLoad(String filename) {
     try (PointerScope scope = new PointerScope()) {
       TF_Status status = TF_Status.newStatus();