mirror of
https://github.com/OPCFoundation/UA-.NETStandard.git
synced 2026-10-20 16:52:07 +08:00
889572472f
Convert `DataValue` from a mutable reference type (`class`) to a `readonly struct` to eliminate per-allocation GC pressure on every attribute read, subscription publish, and history sample. ### Key API changes (user-visible) | Before | After | Pattern | |---|---|---| | `class DataValue` | `readonly struct DataValue : INullable` | Foundation | | `Equals(DataValue?)` / `operator ==(DataValue?, DataValue?)` | `Equals(DataValue)` / `operator ==(DataValue, DataValue)` | Value semantics | | `IEncoder.WriteDataValue(string?, DataValue?)` | `IEncoder.WriteDataValue(string?, DataValue)` | Non-nullable wire API | | `IDecoder.ReadDataValue(...) -> DataValue?` | `IDecoder.ReadDataValue(...) -> DataValue` | Same | | `IDataChangeMonitoredItemQueue.PeekLast/Oldest()` | `TryPeekLastValue/Oldest(out DataValue)` | TryGet pattern | | `IAggregateCalculator.GetProcessedValue(bool)` | `TryGetProcessedValue(bool, out DataValue)` | Same | | `IUaPubSubDataStore.ReadPublishedDataItem(...)` | `TryReadPublishedDataItem(NodeId, uint, out DataValue)` | Same | | `Dictionary<uint, DataValue?>` (NodeCacheContext) | `Dictionary<uint, DataValue>` | Default + IsNull | | `IHistoryDataSource.FirstRaw/NextRaw` | `TryFirstRaw/TryNextRaw(out DataValue)` | TryGet pattern | | `NodeState.ReadAttribute(... DataValue)` | `NodeState.ReadAttribute(... ref DataValue)` | Sync mutation via ref | | `NodeState.ReadAttributeAsync(... DataValue)` | `NodeState.ReadAttributeAsync(...) -> ValueTask<(ServiceResult, DataValue)>` | Async return tuple | | `obj as DataValue` (heterogeneous Dictionary<string, object>) | `obj is DataValue dv ? dv : default(DataValue)` | Safe struct cast | | `Assert.That(dv, Is.Not.Null)` (tests) | `Assert.That(dv.IsNull, Is.False)` | Struct test pattern | | `[Obsolete] Value` setter, all property setters | Removed; use ctor or `With*()` | Immutability | | `[DataContract]` + `[DataMember]` | Removed; surrogate via `SerializableDataValue` + `DataValueSurrogateProvider` | Serialization | ### Wire format Wire format is **byte-identical** to the previous class-based implementation across binary / JSON / XML encoders. Default DataValue (`.IsNull == true`) is treated as the equivalent of the old null reference (writes JSON `null`, binary `byte 0`, XML omitted element). ### Why TryGet pattern (instead of leaving `DataValue?`) For methods that previously returned `DataValue?` to signal "no value available" (queue peek, aggregate result, data store lookup, history navigation), the conversion to `bool TryGet(out DataValue)` matches BCL conventions (`Dictionary.TryGetValue`, `Queue.TryPeek`, `Int32.TryParse`) and gives the caller an explicit "may be absent" affordance without `Nullable<DataValue>` overhead. ### Breaking changes summary - `DataValue` is now a `readonly struct` - boxing/unboxing semantics change for callers using `object`-typed APIs. - `IEncoder.WriteDataValue` / `IDecoder.ReadDataValue` / `ReadDataValueArray` interface signatures lose the `Nullable` wrapper. - `IDataChangeMonitoredItemQueue.PeekLastValue` / `PeekOldestValue` -> `TryPeekLastValue` / `TryPeekOldestValue` (out parameter). - `IAggregateCalculator.GetProcessedValue` -> `TryGetProcessedValue` (out parameter). - `IUaPubSubDataStore.ReadPublishedDataItem` -> `TryReadPublishedDataItem` (out parameter). - `NodeState.ReadAttribute` takes `ref DataValue`; `ReadAttributeAsync` returns `ValueTask<(ServiceResult, DataValue)>`. - `DataValue` property setters removed (use constructor + `With*` mutators).
140 lines
5.8 KiB
C#
140 lines
5.8 KiB
C#
/* ========================================================================
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* Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
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*
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* OPC Foundation MIT License 1.00
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* The complete license agreement can be found here:
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* http://opcfoundation.org/License/MIT/1.00/
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* ======================================================================*/
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using System;
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namespace Opc.Ua.Fuzzing
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{
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#pragma warning disable IDE0079 // Remove unnecessary suppression
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#pragma warning disable RCS1043
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public static partial class Testcases
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#pragma warning restore RCS1043, IDE0079
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{
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public delegate void MessageEncoder(IEncoder encoder);
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public static readonly MessageEncoder[] MessageEncoders = [ReadRequest, ReadResponse];
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public static void ReadRequest(IEncoder encoder)
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{
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var nodeId = new NodeId(1000);
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var readRequest = new ReadRequest
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{
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RequestHeader = new RequestHeader
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{
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Timestamp = DateTime.UtcNow,
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RequestHandle = 42,
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AdditionalHeader = new ExtensionObject()
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},
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NodesToRead =
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[
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new ReadValueId { NodeId = nodeId, AttributeId = Attributes.Description },
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new ReadValueId { NodeId = nodeId, AttributeId = Attributes.Value },
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new ReadValueId { NodeId = nodeId, AttributeId = Attributes.DisplayName },
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new ReadValueId { NodeId = nodeId, AttributeId = Attributes.AccessLevel },
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new ReadValueId { NodeId = nodeId, AttributeId = Attributes.RolePermissions }
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]
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};
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encoder.EncodeMessage(readRequest);
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}
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public static void ReadResponse(IEncoder encoder)
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{
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DateTimeUtc now = DateTimeUtc.Now;
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var readRequest = new ReadResponse
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{
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Results =
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[
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new DataValue(
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Variant.From("Hello World"),
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StatusCodes.Good,
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now.AddMilliseconds(60000),
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now,
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10,
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100),
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new DataValue(
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Variant.From((uint)12345678),
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StatusCodes.BadDataLost,
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now.AddMilliseconds(60000),
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now),
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new DataValue(
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Variant.From(ByteString.From([0, 1, 2, 3, 4, 5, 6])),
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StatusCodes.Good,
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now.AddMilliseconds(60000),
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now),
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new DataValue(
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Variant.From((byte)42),
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StatusCodes.Good,
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now)
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],
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DiagnosticInfos =
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[
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new DiagnosticInfo
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{
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AdditionalInfo = "Hello World",
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InnerStatusCode = StatusCodes.BadCertificateHostNameInvalid,
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InnerDiagnosticInfo = new DiagnosticInfo
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{
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AdditionalInfo = "Hello World",
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InnerStatusCode = StatusCodes.BadNodeIdUnknown
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}
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}
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],
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ResponseHeader = new ResponseHeader
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{
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Timestamp = DateTime.UtcNow,
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RequestHandle = 42,
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ServiceResult = StatusCodes.Good,
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ServiceDiagnostics = new DiagnosticInfo
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{
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AdditionalInfo = "NodeId not found",
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InnerStatusCode = StatusCodes.BadNodeIdExists,
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InnerDiagnosticInfo = new DiagnosticInfo
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{
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AdditionalInfo = "Hello World",
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InnerStatusCode = StatusCodes.BadNodeIdUnknown,
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InnerDiagnosticInfo = new DiagnosticInfo
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{
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AdditionalInfo = "Hello World",
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InnerStatusCode = StatusCodes.BadNodeIdUnknown,
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InnerDiagnosticInfo = new DiagnosticInfo
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{
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AdditionalInfo = "Hello World",
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InnerStatusCode = StatusCodes.BadNodeIdUnknown
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}
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}
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}
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}
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}
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};
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encoder.EncodeMessage(readRequest);
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}
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}
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}
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