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ProxyMetadataProvider.cs
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95 lines (77 loc) · 2.85 KB
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using System;
using System.Collections.Concurrent;
using System.Reflection;
namespace NetCoreStack.Proxy
{
public class ProxyMetadataProvider
{
private readonly TypeCache _typeCache = new TypeCache();
private readonly Func<ProxyModelMetadataIdentity, ProxyModelMetadataCacheEntry> _cacheEntryFactory;
private readonly ProxyModelMetadataCacheEntry _metadataCacheEntryForObjectType;
public ProxyMetadataProvider()
{
_cacheEntryFactory = CreateCacheEntry;
_metadataCacheEntryForObjectType = GetMetadataCacheEntryForObjectType();
}
private ProxyModelMetadataCacheEntry GetMetadataCacheEntryForObjectType()
{
var key = ProxyModelMetadataIdentity.ForType(typeof(object));
var entry = CreateCacheEntry(key);
return entry;
}
private ProxyModelMetadataCacheEntry CreateCacheEntry(ProxyModelMetadataIdentity key)
{
var metadata = new ProxyModelMetadata(key);
return new ProxyModelMetadataCacheEntry(metadata);
}
private ProxyModelMetadataCacheEntry GetCacheEntry(Type modelType)
{
ProxyModelMetadataCacheEntry cacheEntry;
if (modelType == typeof(object))
{
cacheEntry = _metadataCacheEntryForObjectType;
}
else
{
var key = ProxyModelMetadataIdentity.ForType(modelType);
cacheEntry = _typeCache.GetOrAdd(key, _cacheEntryFactory);
}
return cacheEntry;
}
private ProxyModelMetadataCacheEntry GetCacheEntry(ParameterInfo parameter)
{
return _typeCache.GetOrAdd(
ProxyModelMetadataIdentity.ForParameter(parameter),
_cacheEntryFactory);
}
public ProxyModelMetadata GetMetadataForParameter(ParameterInfo parameter)
{
if (parameter == null)
{
throw new ArgumentNullException(nameof(parameter));
}
var cacheEntry = GetCacheEntry(parameter);
return cacheEntry.Metadata;
}
public ProxyModelMetadata GetMetadataForType(Type modelType)
{
if (modelType == null)
{
throw new ArgumentNullException(nameof(modelType));
}
var cacheEntry = GetCacheEntry(modelType);
return cacheEntry.Metadata;
}
private class TypeCache : ConcurrentDictionary<ProxyModelMetadataIdentity, ProxyModelMetadataCacheEntry>
{
}
private struct ProxyModelMetadataCacheEntry
{
public ProxyModelMetadataCacheEntry(ProxyModelMetadata metadata)
{
Metadata = metadata;
}
public ProxyModelMetadata Metadata { get; }
}
}
}