chore: import upstream snapshot with attribution

libnd4j/include/graph/GraphHolder.h

@@ -0,0 +1,92 @@
+/* ******************************************************************************
+ *
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ *  See the NOTICE file distributed with this work for additional
+ *  information regarding copyright ownership.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ******************************************************************************/
+
+//
+//  @author raver119@gmail.com
+//
+#include <exceptions/unknown_graph_exception.h>
+#include <graph/Graph.h>
+#include <helpers/SimpleReadWriteLock.h>
+#include <helpers/logger.h>
+
+#include <map>
+#include <unordered_map>
+
+namespace sd {
+namespace graph {
+class SD_LIB_EXPORT GraphHolder {
+ private:
+  SD_MAP_IMPL<LongType, Graph*> _graphF;
+
+  SD_MAP_IMPL<LongType, SimpleReadWriteLock> _locks;
+
+  GraphHolder() = default;
+  ~GraphHolder() = default;
+
+ public:
+  static GraphHolder& getInstance();
+
+  void registerGraph(LongType graphId, Graph* graph);
+
+  Graph* cloneGraph(LongType graphId);
+
+  Graph* pullGraph(LongType graphId);
+
+  void forgetGraph(LongType graphId);
+
+  void dropGraph(LongType graphId);
+
+  void dropGraphAny(LongType graphId);
+
+  bool hasGraph(LongType graphId);
+
+  bool hasGraphAny(LongType graphId);
+
+  flatbuffers::Offset<::graph::FlatResult> execute(LongType graphId, flatbuffers::FlatBufferBuilder& builder,
+                                          const ::graph::FlatInferenceRequest* request);
+
+  void replaceGraph(LongType graphId, Graph* graph);
+
+  /////////////////////////////
+
+  SD_INLINE void lockWrite(LongType graphId) {
+    if (_locks.count(graphId) == 0) return;
+
+    _locks[graphId].lockWrite();
+  }
+
+  SD_INLINE void unlockWrite(LongType graphId) {
+    if (_locks.count(graphId) == 0) return;
+
+    _locks[graphId].unlockWrite();
+  }
+
+  SD_INLINE void lockRead(LongType graphId) {
+    if (_locks.count(graphId) == 0) return;
+
+    _locks[graphId].lockRead();
+  }
+
+  SD_INLINE void unlockRead(LongType graphId) {
+    if (_locks.count(graphId) == 0) return;
+
+    _locks[graphId].unlockRead();
+  }
+};
+}  // namespace graph
+}  // namespace sd