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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using Interlocked = System.Threading.Interlocked;
#if ES_BUILD_STANDALONE
namespace Microsoft.Diagnostics.Tracing
#else
namespace System.Diagnostics.Tracing
#endif
{
/// <summary>
/// TraceLogging: Stores the metadata and event identifier corresponding
/// to a tracelogging event type+name+tags combination.
/// </summary>
internal sealed class NameInfo
: ConcurrentSetItem<KeyValuePair<string, EventTags>, NameInfo>
{
/// <summary>
/// Insure that eventIds strictly less than 'eventId' will not be
/// used by the SelfDescribing events.
/// </summary>
internal static void ReserveEventIDsBelow(int eventId)
{
for(;;)
{
int snapshot = lastIdentity;
int newIdentity = (lastIdentity & ~0xFFFFFF) + eventId;
newIdentity = Math.Max(newIdentity, snapshot); // Should be redundant. as we only create descriptors once.
if (Interlocked.CompareExchange(ref lastIdentity, newIdentity, snapshot) == snapshot)
break;
}
}
private static int lastIdentity = Statics.TraceLoggingChannel << 24;
internal readonly string name;
internal readonly EventTags tags;
internal readonly int identity;
internal readonly byte[] nameMetadata;
public NameInfo(string name, EventTags tags, int typeMetadataSize)
{
this.name = name;
this.tags = tags & Statics.EventTagsMask;
this.identity = Interlocked.Increment(ref lastIdentity);
int tagsPos = 0;
Statics.EncodeTags((int)this.tags, ref tagsPos, null);
this.nameMetadata = Statics.MetadataForString(name, tagsPos, 0, typeMetadataSize);
tagsPos = 2;
Statics.EncodeTags((int)this.tags, ref tagsPos, this.nameMetadata);
}
public override int Compare(NameInfo other)
{
return this.Compare(other.name, other.tags);
}
public override int Compare(KeyValuePair<string, EventTags> key)
{
return this.Compare(key.Key, key.Value & Statics.EventTagsMask);
}
private int Compare(string otherName, EventTags otherTags)
{
int result = StringComparer.Ordinal.Compare(this.name, otherName);
if (result == 0 && this.tags != otherTags)
{
result = this.tags < otherTags ? -1 : 1;
}
return result;
}
}
}
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