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FilteringTargetWrapper: Add support for batch writing + PostFiltering…
…TargetWrapper: performance optimizations (#3405) * FilteringTargetWrapper - Add support for batch writing and use of whenRepeated as Filter
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// | ||
// Copyright (c) 2004-2019 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen | ||
// | ||
// All rights reserved. | ||
// | ||
// Redistribution and use in source and binary forms, with or without | ||
// modification, are permitted provided that the following conditions | ||
// are met: | ||
// | ||
// * Redistributions of source code must retain the above copyright notice, | ||
// this list of conditions and the following disclaimer. | ||
// | ||
// * Redistributions in binary form must reproduce the above copyright notice, | ||
// this list of conditions and the following disclaimer in the documentation | ||
// and/or other materials provided with the distribution. | ||
// | ||
// * Neither the name of Jaroslaw Kowalski nor the names of its | ||
// contributors may be used to endorse or promote products derived from this | ||
// software without specific prior written permission. | ||
// | ||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | ||
// THE POSSIBILITY OF SUCH DAMAGE. | ||
// | ||
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using System; | ||
using System.Collections.Generic; | ||
using JetBrains.Annotations; | ||
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namespace NLog.Internal | ||
{ | ||
internal static class CollectionExtensions | ||
{ | ||
/// <summary> | ||
/// Memory optimized filtering | ||
/// </summary> | ||
/// <remarks>Passing state too avoid delegate capture and memory-allocations.</remarks> | ||
[NotNull] | ||
public static IList<TItem> Filter<TItem, TState>([NotNull] this IList<TItem> items, TState state, Func<TItem, TState, bool> filter) | ||
{ | ||
var hasIgnoredLogEvents = false; | ||
IList<TItem> filterLogEvents = null; | ||
for (var i = 0; i < items.Count; ++i) | ||
{ | ||
var item = items[i]; | ||
if (filter(item, state)) | ||
{ | ||
if (hasIgnoredLogEvents && filterLogEvents == null) | ||
{ | ||
filterLogEvents = new List<TItem>(); | ||
} | ||
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filterLogEvents?.Add(item); | ||
} | ||
else | ||
{ | ||
if (!hasIgnoredLogEvents && i > 0) | ||
{ | ||
filterLogEvents = new List<TItem>(); | ||
for (var j = 0; j < i; ++j) | ||
filterLogEvents.Add(items[j]); | ||
} | ||
hasIgnoredLogEvents = true; | ||
} | ||
} | ||
return filterLogEvents ?? (hasIgnoredLogEvents ? ArrayHelper.Empty<TItem>() : items); | ||
} | ||
} | ||
} |
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