ClearScript/ClearScript/JavaScript/JsonModuleManager.cs at master · chinaray/ClearScript · GitHub

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// Licensed under the MIT license.

using System;

using System.Collections.Generic;

using System.Linq;

using Microsoft.ClearScript.Util;

namespace Microsoft.ClearScript.JavaScript

{

internal sealed class JsonModuleManager

{

private readonly ScriptEngine engine;

private readonly List<Module> moduleCache = new List<Module>();

public JsonModuleManager(ScriptEngine engine)

{

this.engine = engine;

}

public int ModuleCacheSize => moduleCache.Count;

public Module GetOrCreateModule(UniqueDocumentInfo documentInfo, string json)

{

var jsonDigest = json.GetDigest();

var cachedModule = GetCachedModule(documentInfo, jsonDigest);

if (cachedModule != null)

{

return cachedModule;

}

return CacheModule(new Module(engine, documentInfo, jsonDigest, json));

}

private Module GetCachedModule(UniqueDocumentInfo documentInfo, UIntPtr jsonDigest)

{

for (var index = 0; index < moduleCache.Count; index++)

{

var cachedModule = moduleCache[index];

if ((cachedModule.DocumentInfo.UniqueId == documentInfo.UniqueId) && (cachedModule.JsonDigest == jsonDigest))

{

moduleCache.RemoveAt(index);

moduleCache.Insert(0, cachedModule);

return cachedModule;

}

return null;

}

private Module CacheModule(Module module)

{

var cachedModule = moduleCache.FirstOrDefault(testModule => (testModule.DocumentInfo.UniqueId == module.DocumentInfo.UniqueId) && (testModule.JsonDigest == module.JsonDigest));

if (cachedModule != null)

{

return cachedModule;

}

var maxModuleCacheSize = Math.Max(16, Convert.ToInt32(Math.Min(DocumentCategory.Json.MaxCacheSize, int.MaxValue)));

while (moduleCache.Count >= maxModuleCacheSize)

{

moduleCache.RemoveAt(moduleCache.Count - 1);

}

moduleCache.Insert(0, module);

return module;

}

#region Nested type: Module

public sealed class Module

{

private readonly ScriptEngine engine;

private readonly string json;

private bool parsed;

private object result;

public Module(ScriptEngine engine, UniqueDocumentInfo documentInfo, UIntPtr jsonDigest, string json)

{

this.engine = engine;

this.json = json;

DocumentInfo = documentInfo;

JsonDigest = jsonDigest;

}

public UniqueDocumentInfo DocumentInfo { get; }

public UIntPtr JsonDigest { get; }

public object Result

{

get

{

if (!parsed)

{

parsed = true;

result = ((ScriptObject)engine.Global.GetProperty("EngineInternal")).InvokeMethod("parseJson", json);

}

return result;

}

#endregion

}

ClearScript/ClearScript/JavaScript/JsonModuleManager.cs at master · chinaray/ClearScript · GitHub

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