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, 69 insertions, 0 deletions

diff --git a/src/backends/backendsCommon/TensorHandleFactoryRegistry.cpp b/src/backends/backendsCommon/TensorHandleFactoryRegistry.cpp
new file mode 100644
index 0000000000..4692b9f960
--- /dev/null
+++ b/src/backends/backendsCommon/TensorHandleFactoryRegistry.cpp
@@ -0,0 +1,69 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "TensorHandleFactoryRegistry.hpp"
+#include "IMemoryManager.hpp"
+
+
+namespace armnn
+{
+
+void TensorHandleFactoryRegistry::RegisterFactory(std::unique_ptr <ITensorHandleFactory> newFactory)
+{
+    if (!newFactory)
+    {
+        return;
+    }
+
+    ITensorHandleFactory::FactoryId id = newFactory->GetId();
+
+    // Don't register duplicates
+    for (auto& registeredFactory : m_Factories)
+    {
+        if (id == registeredFactory->GetId())
+        {
+            return;
+        }
+    }
+
+    // Take ownership of the new allocator
+    m_Factories.push_back(std::move(newFactory));
+}
+
+void TensorHandleFactoryRegistry::RegisterMemoryManager(std::shared_ptr<armnn::IMemoryManager> memoryManger)
+{
+    m_MemoryManagers.push_back(memoryManger);
+}
+
+ITensorHandleFactory* TensorHandleFactoryRegistry::GetFactory(ITensorHandleFactory::FactoryId id) const
+{
+    for (auto& factory : m_Factories)
+    {
+        if (factory->GetId() == id)
+        {
+            return factory.get();
+        }
+    }
+
+    return nullptr;
+}
+
+void TensorHandleFactoryRegistry::AquireMemory()
+{
+    for (auto& mgr : m_MemoryManagers)
+    {
+        mgr->Acquire();
+    }
+}
+
+void TensorHandleFactoryRegistry::ReleaseMemory()
+{
+    for (auto& mgr : m_MemoryManagers)
+    {
+        mgr->Release();
+    }
+}
+
+} // namespace armnn