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// Copyright (c) All contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using MessagePack.Formatters;
using MessagePack.Resolvers;
using Nerdbank.Streams;
using Xunit;
namespace MessagePack.Tests
{
public class StringInterningTests
{
[Fact]
public void NullString()
{
var seq = new Sequence<byte>();
var writer = new MessagePackWriter(seq);
writer.WriteNil();
writer.Flush();
var reader = new MessagePackReader(seq);
string result = StandardResolver.Instance.GetFormatter<string>().Deserialize(ref reader, MessagePackSerializerOptions.Standard);
Assert.Null(result);
}
[Fact]
public void EmptyString()
{
var seq = new Sequence<byte>();
var writer = new MessagePackWriter(seq);
writer.Write(string.Empty);
writer.Flush();
var reader = new MessagePackReader(seq);
string result = StandardResolver.Instance.GetFormatter<string>().Deserialize(ref reader, MessagePackSerializerOptions.Standard);
Assert.Same(string.Empty, result);
}
[Theory]
[InlineData(3)]
[InlineData(1024 * 1024)]
public void EquivalentStringsGetSharedInstance(int length)
{
string originalValue1 = new string('a', length);
string originalValue3 = new string('b', length);
var seq = new Sequence<byte>();
var writer = new MessagePackWriter(seq);
writer.Write(originalValue1);
writer.Write(originalValue1);
writer.Write(originalValue3);
writer.Flush();
var reader = new MessagePackReader(seq);
var formatter = new StringInterningFormatter();
string value1 = formatter.Deserialize(ref reader, MessagePackSerializerOptions.Standard);
string value2 = formatter.Deserialize(ref reader, MessagePackSerializerOptions.Standard);
string value3 = formatter.Deserialize(ref reader, MessagePackSerializerOptions.Standard);
Assert.Equal(originalValue1, value1);
Assert.Equal(originalValue3, value3);
Assert.Same(value1, value2);
}
[Fact]
public void StringMemberInterning()
{
ClassOfStrings before = new ClassOfStrings { InternedString = "abc", OrdinaryString = "def" };
ClassOfStrings after1 = MessagePackSerializer.Deserialize<ClassOfStrings>(MessagePackSerializer.Serialize(before, MessagePackSerializerOptions.Standard), MessagePackSerializerOptions.Standard);
ClassOfStrings after2 = MessagePackSerializer.Deserialize<ClassOfStrings>(MessagePackSerializer.Serialize(before, MessagePackSerializerOptions.Standard), MessagePackSerializerOptions.Standard);
Assert.Equal(after1.InternedString, after2.InternedString);
Assert.Equal(after1.OrdinaryString, after2.OrdinaryString);
Assert.Same(after1.InternedString, after2.InternedString);
Assert.NotSame(after1.OrdinaryString, after2.OrdinaryString);
}
[Fact]
public void StringMemberInterning_CustomResolver()
{
var options = MessagePackSerializerOptions.Standard.WithResolver(
CompositeResolver.Create(
new IMessagePackFormatter[] { new StringInterningFormatter() },
new IFormatterResolver[] { StandardResolver.Instance }));
ClassOfStrings before = new ClassOfStrings { InternedString = "abc", OrdinaryString = "def" };
ClassOfStrings after1 = MessagePackSerializer.Deserialize<ClassOfStrings>(MessagePackSerializer.Serialize(before, options), options);
ClassOfStrings after2 = MessagePackSerializer.Deserialize<ClassOfStrings>(MessagePackSerializer.Serialize(before, options), options);
Assert.Equal(after1.InternedString, after2.InternedString);
Assert.Equal(after1.OrdinaryString, after2.OrdinaryString);
Assert.Same(after1.InternedString, after2.InternedString);
Assert.Same(after1.OrdinaryString, after2.OrdinaryString);
}
[MessagePackObject]
public class ClassOfStrings
{
[Key(0)]
[MessagePackFormatter(typeof(StringInterningFormatter))]
public string InternedString { get; set; }
[Key(1)]
public string OrdinaryString { get; set; }
}
}
}
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