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    • Avalanche.Service
      • Introduction
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        • IRequest
        • [Request]
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    • Avalanche.Writer
      • Introduction
      • Writer
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    • Avalanche.Accessor
      • Introduction
      • AccessorServices
      • List
        • ListAccessor
        • ListConstructor
        • ListDeconstructor
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        • RecordConstructor
        • RecordDeconstructor
        • RecordDefaultConstructor
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        • FieldAccessor
        • FieldReader
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        • FieldReferer
      • Dependency Injection
        • Introduction
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    • Avalanche.Emit
      • Introduction
      • TypeBuilder
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      • Introduction
      • IDataTypeBase
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      • Introduction
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        • IFileSystem
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    • Avalanche.Identity
      • Introduction
      • Identity
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        • Introduction
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    • Avalanche.Utilities
      • Introduction
      • Collections
        • Tuples
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        • Introduction
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      • String
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        • Void
    • Avalanche.Core
      • License
      • Order

    RecordDeconstructor

    Record deconstructor extracts each field value into a tuple.

    IWriterToRef<MyClass, (int, string)> myClassDeconstructor;
    IWriterToRef<MyStruct, (int, string)> myStructDeconstructor;
    

    Example class and struct.

    public record MyClass(int Id, string Label);
    public record struct MyStruct(int Id, string Label);
    

    Creating a deconstructor

    Deconstructor can be created with a delegate adapter.

    var myClassDeconstructor = DelegateWriter.Reader<MyClass, (int, string)>(record => (record.Id, record.Label));
    var myStructDeconstructor = DelegateWriter.Reader<MyStruct, (int, string)>(record => (record.Id, record.Label));
    

    Simple deconstructor implements just IWriterToRef<Tuple,Record>.

    IWriterToRef<MyClass, (int, string)> myClassDeconstructor = new MyClassDeconstructor1();
    IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = new MyStructDeconstructor1();
    
    /// <summary></summary>
    public class MyClassDeconstructor1 : WriterToRef<MyClass, (int, string)>
    {
        /// <summary></summary>
        public override bool TryWrite(MyClass from, ref (int, string) to, IServiceProvider? context = null)
        {
            to.Item1 = from.Id;
            to.Item2 = from.Label;
            return true;
        }
    }
    
    /// <summary></summary>
    public class MyStructDeconstructor1 : WriterToRef<MyStruct, (int, string)>
    {
        /// <summary></summary>
        public override bool TryWrite(MyStruct from, ref (int, string) to, IServiceProvider? context = null)
        {
            to.Item1 = from.Id;
            to.Item2 = from.Label;
            return true;
        }
    }
    

    RecordDeconstructorBase can be used for base class for deconstructor. Base class has more type-casting features.

    IWriterToRef<MyClass, (int, string)> myClassDeconstructor = new MyClassDeconstructor2();
    IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = new MyStructDeconstructor2();
    
    /// <summary></summary>
    public class MyClassDeconstructor2 : RecordDeconstructorBase<MyClass, (int, string)>
    {
        /// <summary></summary>
        public override bool TryWrite(MyClass from, ref (int, string) to, IServiceProvider? context = null)
        {
            to.Item1 = from.Id;
            to.Item2 = from.Label;
            return true;
        }
    }
    
    /// <summary></summary>
    public class MyStructDeconstructor2 : RecordDeconstructorBase<MyStruct, (int, string)>
    {
        /// <summary></summary>
        public override bool TryWrite(MyStruct from, ref (int, string) to, IServiceProvider? context = null)
        {
            to.Item1 = from.Id;
            to.Item2 = from.Label;
            return true;
        }
    }
    

    RecordDeconstructorRequest(Type) builds a deconstructor for record-like types using service stack's handlers.

    RecordDeconstructorRequest myClassRequest = new RecordDeconstructorRequest(typeof(MyClass));
    RecordDeconstructorRequest myStructRequest = new RecordDeconstructorRequest(typeof(MyStruct));
    IWriterToRef<MyClass, (int, string)> myClassDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyClass, (int, string)>>(myClassRequest);
    IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyStruct, (int, string)>>(myStructRequest);
    

    RecordDeconstructorRequest(IRecordDescription) builds a deconstructor from record description.

    IRecordDescription myClassDescription = new RecordDescription().Read(typeof(MyClass)).AssignConstructors().ChooseConstruction().SetReadOnly();
    RecordDeconstructorRequest myClassRequest = new RecordDeconstructorRequest(myClassDescription);
    IWriterToRef<MyClass, (int, string)> myClassDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyClass, (int, string)>>(myClassRequest);
    

    Usage

    Deconstructor creates tuple-value (int, string) from a record.

    IWriterToRef<MyClass, (int, string)> myClassDeconstructor = new MyClassDeconstructor2();
    IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = new MyStructDeconstructor2();
    

    Deconstructor can be typecasted to e.g. IWriterBase<object, object>. Tuple values can be written right into a box in heap.

    MyClass myClass = new MyClass(5, "Hello");
    (int, string) tuple1 = myClassDeconstructor.Read(myClass);
    MyStruct myStruct = new MyStruct(5, "Hello");
    (int, string) tuple2 = myClassDeconstructor.Read(myClass);
    
    // Create record box
    object box = myStruct;
    
    // Read tuple box
    object tupleBox = null!;
    myStructDeconstructor.TypeCast<object, object>().WriteAs<object, object>(box, ref tupleBox);
    

    Or a new box can be created.

    tupleBox = myStructDeconstructor.TypeCast<object, object>().ReadAs<object, object>(box);
    

    Custom deconstructor builder

    Custom handler can front-run RecordDeconstructorRequest.

    public class MyClassDeconstructorBuilder : IHandler<RecordDeconstructorRequest, IWriterBase>
    {
        [Order(-100)]
        public void Handle(IQuery<RecordDeconstructorRequest, IWriterBase> query)
        {
            // Already handled
            if (query.Handled()) return;
    
            // Place type here
            Type? recordType = null;
            //
            if (query.Request.Record is IRecordDescription recordDescription1) recordType = recordDescription1?.Type;
            //
            else if (query.Request.Record is Type type1) recordType = type1;
            //
            else return;
    
            // This handler only handles "MyClass"
            if (recordType == null || !recordType.Equals(typeof(MyClass))) return;
            // Assign constructor
            query.Response.SetValue(new MyClassDeconstructor2());
    
        }
    }
    
    // Create service
    IService service = Services.Create((AccessorServices.Handlers, new MyClassDeconstructorBuilder()), CachePolicies.Default);
    // Constructor request
    RecordDeconstructorRequest myClassRequest = new RecordDeconstructorRequest(typeof(MyClass));
    // Get deconstructor
    IWriterToRef<MyClass, (int, string)> myClassDeconstructor =
        service.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyClass, (int, string)>>(myClassRequest);
    //
    (int, string) tuple = myClassDeconstructor.Read(new MyClass(80, "A"));
    

    Full Example

    Full example
    using System;
    using Avalanche.Accessor;
    using Avalanche.Service;
    using Avalanche.Utilities;
    using Avalanche.Utilities.Record;
    using Avalanche.Writer;
    
    public class recorddeconstructor
    {
        public static void Run()
        {
            {
    #pragma warning disable CS0168
                // <01>
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor;
                IWriterToRef<MyStruct, (int, string)> myStructDeconstructor;
                // </01>
    #pragma warning restore CS0168
            }
            {
                // <11>
                var myClassDeconstructor = DelegateWriter.Reader<MyClass, (int, string)>(record => (record.Id, record.Label));
                var myStructDeconstructor = DelegateWriter.Reader<MyStruct, (int, string)>(record => (record.Id, record.Label));
                // </11>
            }
            {
                // <12>
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor = new MyClassDeconstructor1();
                IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = new MyStructDeconstructor1();
                // </12>
            }
            {
                // <14>
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor = new MyClassDeconstructor2();
                IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = new MyStructDeconstructor2();
                // </14>
            }
    
            {
                // <16>
                RecordDeconstructorRequest myClassRequest = new RecordDeconstructorRequest(typeof(MyClass));
                RecordDeconstructorRequest myStructRequest = new RecordDeconstructorRequest(typeof(MyStruct));
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyClass, (int, string)>>(myClassRequest);
                IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyStruct, (int, string)>>(myStructRequest);
                // </16>
            }
    
            {
                // <17>
                IRecordDescription myClassDescription = new RecordDescription().Read(typeof(MyClass)).AssignConstructors().ChooseConstruction().SetReadOnly();
                RecordDeconstructorRequest myClassRequest = new RecordDeconstructorRequest(myClassDescription);
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyClass, (int, string)>>(myClassRequest);
                // </17>
                IRecordDescription myStructDescription = new RecordDescription().Read(typeof(MyStruct)).AssignConstructors().ChooseConstruction().SetReadOnly();
                RecordDeconstructorRequest myStructRequest = new RecordDeconstructorRequest(myStructDescription);
                IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = AccessorServices.Instance.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyStruct, (int, string)>>(myStructRequest);
            }
    
            {
                // <21>
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor = new MyClassDeconstructor2();
                IWriterToRef<MyStruct, (int, string)> myStructDeconstructor = new MyStructDeconstructor2();
                // </21>
    
                // <22>
                MyClass myClass = new MyClass(5, "Hello");
                (int, string) tuple1 = myClassDeconstructor.Read(myClass);
                MyStruct myStruct = new MyStruct(5, "Hello");
                (int, string) tuple2 = myClassDeconstructor.Read(myClass);
    
                // Create record box
                object box = myStruct;
    
                // Read tuple box
                object tupleBox = null!;
                myStructDeconstructor.TypeCast<object, object>().WriteAs<object, object>(box, ref tupleBox);
                // </22>
    
                // <23>
                tupleBox = myStructDeconstructor.TypeCast<object, object>().ReadAs<object, object>(box);
                // </23>
            }
    
    
            {
                // <32>
                // Create service
                IService service = Services.Create((AccessorServices.Handlers, new MyClassDeconstructorBuilder()), CachePolicies.Default);
                // Constructor request
                RecordDeconstructorRequest myClassRequest = new RecordDeconstructorRequest(typeof(MyClass));
                // Get deconstructor
                IWriterToRef<MyClass, (int, string)> myClassDeconstructor =
                    service.GetRequired<RecordDeconstructorRequest, IWriterToRef<MyClass, (int, string)>>(myClassRequest);
                //
                (int, string) tuple = myClassDeconstructor.Read(new MyClass(80, "A"));
                // </32>
            }
        }
    
        // <00>
        public record MyClass(int Id, string Label);
        public record struct MyStruct(int Id, string Label);
        // </00>
    
        // <13>
        /// <summary></summary>
        public class MyClassDeconstructor1 : WriterToRef<MyClass, (int, string)>
        {
            /// <summary></summary>
            public override bool TryWrite(MyClass from, ref (int, string) to, IServiceProvider? context = null)
            {
                to.Item1 = from.Id;
                to.Item2 = from.Label;
                return true;
            }
        }
    
        /// <summary></summary>
        public class MyStructDeconstructor1 : WriterToRef<MyStruct, (int, string)>
        {
            /// <summary></summary>
            public override bool TryWrite(MyStruct from, ref (int, string) to, IServiceProvider? context = null)
            {
                to.Item1 = from.Id;
                to.Item2 = from.Label;
                return true;
            }
        }
        // </13>
    
        // <15>
        /// <summary></summary>
        public class MyClassDeconstructor2 : RecordDeconstructorBase<MyClass, (int, string)>
        {
            /// <summary></summary>
            public override bool TryWrite(MyClass from, ref (int, string) to, IServiceProvider? context = null)
            {
                to.Item1 = from.Id;
                to.Item2 = from.Label;
                return true;
            }
        }
    
        /// <summary></summary>
        public class MyStructDeconstructor2 : RecordDeconstructorBase<MyStruct, (int, string)>
        {
            /// <summary></summary>
            public override bool TryWrite(MyStruct from, ref (int, string) to, IServiceProvider? context = null)
            {
                to.Item1 = from.Id;
                to.Item2 = from.Label;
                return true;
            }
        }
        // </15>
    
        // <31>
        public class MyClassDeconstructorBuilder : IHandler<RecordDeconstructorRequest, IWriterBase>
        {
            [Order(-100)]
            public void Handle(IQuery<RecordDeconstructorRequest, IWriterBase> query)
            {
                // Already handled
                if (query.Handled()) return;
    
                // Place type here
                Type? recordType = null;
                //
                if (query.Request.Record is IRecordDescription recordDescription1) recordType = recordDescription1?.Type;
                //
                else if (query.Request.Record is Type type1) recordType = type1;
                //
                else return;
    
                // This handler only handles "MyClass"
                if (recordType == null || !recordType.Equals(typeof(MyClass))) return;
                // Assign constructor
                query.Response.SetValue(new MyClassDeconstructor2());
    
            }
        }
        // </31>
    }
    
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