Added custom allocator for subsonic responses

src/libs/subsonic/bench/CMakeLists.txt

@@ -0,0 +1,14 @@
+add_executable(bench-subsonic
+       SubsonicBench.cpp
+       )
+
+target_include_directories(bench-subsonic PRIVATE
+       ../impl
+       )
+
+target_link_libraries(bench-subsonic PRIVATE
+       lmscore
+       lmsdatabase
+       lmssubsonic
+       benchmark
+       )

src/libs/subsonic/bench/SubsonicBench.cpp

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2024 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <thread>
+#include <benchmark/benchmark.h>
+
+#include "SubsonicResponse.hpp"
+
+namespace lms::api::subsonic::benchs
+{
+    namespace
+    {
+        Response generateFakeResponse()
+        {
+            Response response{ Response::createOkResponse(defaultServerProtocolVersion) };
+
+            Response::Node& node{ response.createNode("MyNode") };
+            node.setAttribute("Attr1", "value1");
+            node.setAttribute("Attr2", "value2");
+
+            for (std::size_t i{}; i < 100; ++i)
+            {
+                Response::Node& childNode{ node.createArrayChild("MyArrayChild") };
+                childNode.setAttribute("Attr42", i);
+
+                node.addArrayValue("MyArray1", "value1");
+                node.addArrayValue("MyArray1", "value2");
+                for (std::size_t j{}; j < i; ++j)
+                    node.addArrayValue("MyArray2", j);
+            }
+
+            return response;
+        }
+    }
+
+    static void BM_SubsonicResponse_generate(benchmark::State& state)
+    {
+        for (auto _ : state)
+        {
+            Response response{ generateFakeResponse() };
+            benchmark::DoNotOptimize(response);
+            TLSMonotonicMemoryResource::getInstance().reset();
+        }
+    }
+
+    template <ResponseFormat responseFormat>
+    static void BM_SubsonicResponse_serialize(benchmark::State& state)
+    {
+        const Response response{ generateFakeResponse() };
+
+        for (auto _ : state)
+        {
+            std::ostringstream oss; // TODO find something more optimized
+            response.write(oss, responseFormat);
+        }
+    }
+
+    BENCHMARK(BM_SubsonicResponse_generate)->Threads(1)->Threads(std::thread::hardware_concurrency());
+    BENCHMARK(BM_SubsonicResponse_serialize<ResponseFormat::json>);
+    BENCHMARK(BM_SubsonicResponse_serialize<ResponseFormat::xml>);
+}
+
+BENCHMARK_MAIN();