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Sample to show use of FASTER with fixed-length structs (#160)
* Sample to show use of FASTER with fixed-length struct keys and values, of size known at compile time
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| <?xml version="1.0" encoding="utf-8"?> | ||
| <configuration> | ||
| <startup> | ||
| <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" /> | ||
| </startup> | ||
| </configuration> |
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cs/playground/FixedLenStructSample/FixedLenStructSample.csproj
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <TargetFramework>net46</TargetFramework> | ||
| <Platforms>x64</Platforms> | ||
| <RuntimeIdentifier>win7-x64</RuntimeIdentifier> | ||
| </PropertyGroup> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <AllowUnsafeBlocks>true</AllowUnsafeBlocks> | ||
| <RootNamespace>StructSample</RootNamespace> | ||
| <ErrorReport>prompt</ErrorReport> | ||
| <RestoreProjectStyle>PackageReference</RestoreProjectStyle> | ||
| <Prefer32Bit>true</Prefer32Bit> | ||
| </PropertyGroup> | ||
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| <PropertyGroup Condition="'$(Configuration)' == 'Debug'"> | ||
| <DefineConstants>TRACE;DEBUG</DefineConstants> | ||
| <DebugType>full</DebugType> | ||
| <DebugSymbols>true</DebugSymbols> | ||
| <OutputPath>bin\x64\Debug\</OutputPath> | ||
| </PropertyGroup> | ||
| <PropertyGroup Condition="'$(Configuration)' == 'Release'"> | ||
| <DefineConstants>TRACE</DefineConstants> | ||
| <DebugType>pdbonly</DebugType> | ||
| <Optimize>true</Optimize> | ||
| <OutputPath>bin\x64\Release\</OutputPath> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <None Include="App.config" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\..\src\core\FASTER.core.csproj" /> | ||
| </ItemGroup> | ||
| </Project> |
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| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT license. | ||
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| using FASTER.core; | ||
| using System; | ||
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| namespace FixedLenStructSample | ||
| { | ||
| /// <summary> | ||
| /// Callback functions for FASTER operations | ||
| /// </summary> | ||
| public class FixedLenFunctions : IFunctions<FixedLenKey, FixedLenValue, string, string, Empty> | ||
| { | ||
| public void CheckpointCompletionCallback(Guid sessionId, long serialNum) | ||
| { | ||
| } | ||
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| public void ConcurrentReader(ref FixedLenKey key, ref string input, ref FixedLenValue value, ref string dst) | ||
| { | ||
| dst = value.ToString(); | ||
| } | ||
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| public void ConcurrentWriter(ref FixedLenKey key, ref FixedLenValue src, ref FixedLenValue dst) | ||
| { | ||
| src.CopyTo(ref dst); | ||
| } | ||
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| public void CopyUpdater(ref FixedLenKey key, ref string input, ref FixedLenValue oldValue, ref FixedLenValue newValue) | ||
| { | ||
| } | ||
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| public void DeleteCompletionCallback(ref FixedLenKey key, Empty ctx) | ||
| { | ||
| } | ||
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| public void InitialUpdater(ref FixedLenKey key, ref string input, ref FixedLenValue value) | ||
| { | ||
| } | ||
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| public void InPlaceUpdater(ref FixedLenKey key, ref string input, ref FixedLenValue value) | ||
| { | ||
| } | ||
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| public void ReadCompletionCallback(ref FixedLenKey key, ref string input, ref string output, Empty ctx, Status status) | ||
| { | ||
| } | ||
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| public void RMWCompletionCallback(ref FixedLenKey key, ref string input, Empty ctx, Status status) | ||
| { | ||
| } | ||
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| public void SingleReader(ref FixedLenKey key, ref string input, ref FixedLenValue value, ref string dst) | ||
| { | ||
| dst = value.ToString(); | ||
| } | ||
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| public void SingleWriter(ref FixedLenKey key, ref FixedLenValue src, ref FixedLenValue dst) | ||
| { | ||
| src.CopyTo(ref dst); | ||
| } | ||
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| public void UpsertCompletionCallback(ref FixedLenKey key, ref FixedLenValue value, Empty ctx) | ||
| { | ||
| } | ||
| } | ||
| } |
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| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT license. | ||
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| using FASTER.core; | ||
| using System; | ||
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| namespace FixedLenStructSample | ||
| { | ||
| public class Program | ||
| { | ||
| // This sample uses fixed length structs for keys and values | ||
| static void Main() | ||
| { | ||
| var log = Devices.CreateLogDevice("hlog.log", deleteOnClose: true); | ||
| var fht = new FasterKV<FixedLenKey, FixedLenValue, string, string, Empty, FixedLenFunctions> | ||
| (128, new FixedLenFunctions(), | ||
| new LogSettings { LogDevice = log, MemorySizeBits = 17, PageSizeBits = 12 } | ||
| ); | ||
| fht.StartSession(); | ||
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| var key = new FixedLenKey("foo"); | ||
| var value = new FixedLenValue("bar"); | ||
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| var status = fht.Upsert(ref key, ref value, Empty.Default, 0); | ||
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| if (status != Status.OK) | ||
| Console.WriteLine("FixedLenStructSample: Error!"); | ||
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| var input = default(string); // unused | ||
| var output = default(string); | ||
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| key = new FixedLenKey("xyz"); | ||
| status = fht.Read(ref key, ref input, ref output, Empty.Default, 0); | ||
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| if (status != Status.NOTFOUND) | ||
| Console.WriteLine("FixedLenStructSample: Error!"); | ||
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| key = new FixedLenKey("foo"); | ||
| status = fht.Read(ref key, ref input, ref output, Empty.Default, 0); | ||
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| if (status != Status.OK) | ||
| Console.WriteLine("FixedLenStructSample: Error!"); | ||
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| if (output.Equals(value.ToString())) | ||
| Console.WriteLine("FixedLenStructSample: Success!"); | ||
| else | ||
| Console.WriteLine("FixedLenStructSample: Error!"); | ||
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| fht.StopSession(); | ||
| fht.Dispose(); | ||
| log.Close(); | ||
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| Console.WriteLine("Press <ENTER> to end"); | ||
| Console.ReadLine(); | ||
| } | ||
| } | ||
| } |
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cs/playground/FixedLenStructSample/Properties/AssemblyInfo.cs
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| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT license. | ||
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| using System.Reflection; | ||
| using System.Runtime.InteropServices; | ||
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| // General Information about an assembly is controlled through the following | ||
| // set of attributes. Change these attribute values to modify the information | ||
| // associated with an assembly. | ||
| [assembly: AssemblyDescription("")] | ||
| [assembly: AssemblyCopyright("Copyright © 2019")] | ||
| [assembly: AssemblyTrademark("")] | ||
| [assembly: AssemblyCulture("")] | ||
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| // Setting ComVisible to false makes the types in this assembly not visible | ||
| // to COM components. If you need to access a type in this assembly from | ||
| // COM, set the ComVisible attribute to true on that type. | ||
| [assembly: ComVisible(false)] | ||
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| // The following GUID is for the ID of the typelib if this project is exposed to COM | ||
| [assembly: Guid("17bdd0a5-98e5-464a-8a00-050d9ff4c562")] |
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| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT license. | ||
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| using FASTER.core; | ||
| using System; | ||
| using System.Runtime.InteropServices; | ||
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| namespace FixedLenStructSample | ||
| { | ||
| /// <summary> | ||
| /// Represents a fixed length struct type (Length = 32) | ||
| /// </summary> | ||
| [StructLayout(LayoutKind.Explicit, Size = Length)] | ||
| public unsafe struct FixedLenKey : IFasterEqualityComparer<FixedLenKey> | ||
| { | ||
| private const int Length = 32; | ||
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| [FieldOffset(0)] | ||
| private byte data; | ||
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| public FixedLenKey(string v) | ||
| { | ||
| if (Length < 2 * (v.Length + 1)) | ||
| throw new Exception("Insufficient space to store string"); | ||
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| fixed (byte* ptr = &data) | ||
| { | ||
| var data = (char*)ptr; | ||
| for (var i = 0; i < Length / sizeof(char); i++) | ||
| { | ||
| if (i < v.Length) | ||
| *(data + i) = v[i]; | ||
| else | ||
| *(data + i) = '\0'; | ||
| } | ||
| } | ||
| } | ||
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| public void CopyTo(ref FixedLenKey dst) | ||
| { | ||
| fixed (byte* source = &data, destination = &dst.data) | ||
| Buffer.MemoryCopy(source, destination, Length, Length); | ||
| } | ||
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| public bool Equals(ref FixedLenKey k1, ref FixedLenKey k2) | ||
| { | ||
| fixed (byte* pk1 = &k1.data, pk2 = &k2.data) | ||
| { | ||
| for (var i = 0; i < Length; i++) | ||
| { | ||
| var left = *(pk1 + i); | ||
| var right = *(pk2 + i); | ||
| if (left != right) | ||
| return false; | ||
| } | ||
| } | ||
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| return true; | ||
| } | ||
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| public long GetHashCode64(ref FixedLenKey k) | ||
| { | ||
| fixed (byte* data = &k.data) | ||
| return Utility.HashBytes(data, Length); | ||
| } | ||
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| public override string ToString() | ||
| { | ||
| fixed (byte* ptr = &data) | ||
| return new string((char*)ptr); | ||
| } | ||
| } | ||
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| /// <summary> | ||
| /// Represents a fixed length struct type (Length = 64) | ||
| /// </summary> | ||
| [StructLayout(LayoutKind.Explicit, Size = Length)] | ||
| public unsafe struct FixedLenValue : IFasterEqualityComparer<FixedLenValue> | ||
| { | ||
| private const int Length = 64; | ||
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| [FieldOffset(0)] | ||
| private byte data; | ||
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| public FixedLenValue(string v) | ||
| { | ||
| if (Length < 2 * (v.Length + 1)) | ||
| throw new Exception("Insufficient space to store string"); | ||
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| fixed (byte* ptr = &data) | ||
| { | ||
| var data = (char*)ptr; | ||
| for (var i = 0; i < Length / sizeof(char); i++) | ||
| { | ||
| if (i < v.Length) | ||
| *(data + i) = v[i]; | ||
| else | ||
| *(data + i) = '\0'; | ||
| } | ||
| } | ||
| } | ||
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| public void CopyTo(ref FixedLenValue dst) | ||
| { | ||
| fixed (byte* source = &data, destination = &dst.data) | ||
| Buffer.MemoryCopy(source, destination, Length, Length); | ||
| } | ||
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| public bool Equals(ref FixedLenValue k1, ref FixedLenValue k2) | ||
| { | ||
| fixed (byte* pk1 = &k1.data, pk2 = &k2.data) | ||
| { | ||
| for (var i = 0; i < Length; i++) | ||
| { | ||
| var left = *(pk1 + i); | ||
| var right = *(pk2 + i); | ||
| if (left != right) | ||
| return false; | ||
| } | ||
| } | ||
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| return true; | ||
| } | ||
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| public long GetHashCode64(ref FixedLenValue k) | ||
| { | ||
| fixed (byte* data = &k.data) | ||
| return Utility.HashBytes(data, Length); | ||
| } | ||
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| public override string ToString() | ||
| { | ||
| fixed (byte* ptr = &data) | ||
| return new string((char*)ptr); | ||
| } | ||
| } | ||
| } |