IVGCVSW-3277 Refactor TensorHandle factory API

 * Added backend support for multiple types of TensorHandle factories
 * Refactored the backend API to enable new tensor strategies
 * Added mechanism to determine memory strategies during optimization
 * Perform mem-copy only when Direct access is not found
 * Explicitly deleted the copy-constructor from OutputSlot to prevent
   accidental local copies that would cause the DisconnectAll to be
   called by the destructor

Change-Id: I7e812c8e5e6c1c20db1c5932749ac70fd93db7f8
Signed-off-by: Derek Lamberti <derek.lamberti@arm.com>
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/backends/backendsCommon/TensorHandleFactoryRegistry.hpp b/src/backends/backendsCommon/TensorHandleFactoryRegistry.hpp
new file mode 100644
index 0000000000..9e02985301
--- /dev/null
+++ b/src/backends/backendsCommon/TensorHandleFactoryRegistry.hpp
@@ -0,0 +1,49 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include "ITensorHandleFactory.hpp"
+
+#include <memory>
+#include <vector>
+
+namespace armnn
+{
+
+//Forward
+class IMemoryManager;
+
+///
+class TensorHandleFactoryRegistry
+{
+public:
+    TensorHandleFactoryRegistry() = default;
+
+    TensorHandleFactoryRegistry(const TensorHandleFactoryRegistry& other) = delete;
+    TensorHandleFactoryRegistry(TensorHandleFactoryRegistry&& other) = delete;
+
+    /// Register a TensorHandleFactory and transfer ownership
+    void RegisterFactory(std::unique_ptr<ITensorHandleFactory> allocator);
+
+    /// Register a memory manager with shared ownership
+    void RegisterMemoryManager(std::shared_ptr<IMemoryManager> memoryManger);
+
+    /// Find a TensorHandleFactory by Id
+    /// Returns nullptr if not found
+    ITensorHandleFactory* GetFactory(ITensorHandleFactory::FactoryId id) const;
+
+    /// Aquire memory required for inference
+    void AquireMemory();
+
+    /// Release memory required for inference
+    void ReleaseMemory();
+
+private:
+    std::vector<std::unique_ptr<ITensorHandleFactory>> m_Factories;
+    std::vector<std::shared_ptr<IMemoryManager>> m_MemoryManagers;
+};
+
+} // namespace armnn