THRIFT-5133: Use ArrayPool when reading and writing strings to improve performance
Client: netstd
Patch: Mikel Blanchard

This closes #2057
diff --git a/lib/netstd/Benchmarks/Thrift.Benchmarks/CompactProtocolBenchmarks.cs b/lib/netstd/Benchmarks/Thrift.Benchmarks/CompactProtocolBenchmarks.cs
new file mode 100644
index 0000000..cb6b07f
--- /dev/null
+++ b/lib/netstd/Benchmarks/Thrift.Benchmarks/CompactProtocolBenchmarks.cs
@@ -0,0 +1,75 @@
+// Licensed to the Apache Software Foundation(ASF) under one
+// or more contributor license agreements.See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// 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.
+
+using System.IO;
+using System.Threading.Tasks;
+
+using BenchmarkDotNet.Attributes;
+
+using Thrift.Protocol;
+using Thrift.Transport.Client;
+
+namespace Thrift.Benchmarks
+{
+    [MemoryDiagnoser]
+    public class CompactProtocolBenchmarks
+    {
+        private MemoryStream _Stream;
+        private TCompactProtocol _Protocol;
+
+        [Params(10000)]
+        public int NumberOfOperationsPerIteration { get; set; }
+
+        [GlobalSetup]
+        public void GlobalSetup()
+        {
+            _Stream = new MemoryStream();
+            var transport = new TStreamTransport(_Stream, _Stream, null);
+            _Protocol = new TCompactProtocol(transport);
+        }
+
+        [GlobalCleanup]
+        public void GlobalCleanup()
+        {
+            _Protocol.Dispose();
+        }
+
+        [Benchmark]
+        public async Task WriteString()
+        {
+            for (int i = 0; i < NumberOfOperationsPerIteration; i++)
+            {
+                await _Protocol.WriteStringAsync("Thrift String Benchmark");
+
+                _Stream.Seek(0, SeekOrigin.Begin);
+            }
+        }
+
+        [Benchmark]
+        public async Task ReadString()
+        {
+            await _Protocol.WriteStringAsync("Thrift String Benchmark");
+
+            for (int i = 0; i < NumberOfOperationsPerIteration; i++)
+            {
+                _Stream.Seek(0, SeekOrigin.Begin);
+
+                await _Protocol.ReadStringAsync();
+            }
+        }
+    }
+}
diff --git a/lib/netstd/Benchmarks/Thrift.Benchmarks/Program.cs b/lib/netstd/Benchmarks/Thrift.Benchmarks/Program.cs
new file mode 100644
index 0000000..923d73e
--- /dev/null
+++ b/lib/netstd/Benchmarks/Thrift.Benchmarks/Program.cs
@@ -0,0 +1,29 @@
+// Licensed to the Apache Software Foundation(ASF) under one
+// or more contributor license agreements.See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// 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.
+
+using BenchmarkDotNet.Running;
+
+namespace Thrift.Benchmarks
+{
+	internal static class Program
+	{
+		public static void Main(string[] args)
+		{
+			BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);
+		}
+	}
+}
diff --git a/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj b/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj
new file mode 100644
index 0000000..35138d8
--- /dev/null
+++ b/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj
@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <!--
+    Licensed to the Apache Software Foundation(ASF) under one
+    or more contributor license agreements.See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License. You may obtain a copy of the License at
+    
+  	  http://www.apache.org/licenses/LICENSE-2.0
+    
+    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.
+  -->
+  
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>netcoreapp3.1;net48</TargetFrameworks>
+    <TieredCompilation>false</TieredCompilation>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.12.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Thrift\Thrift.csproj" />
+  </ItemGroup>
+
+</Project>