• Avalanche
  • Avalanche.Core
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    • Avalanche.Localization
      • Introduction
      • Localization
      • LocalizationFile
      • LocalizationFiles
      • LocalizationFileSystem
      • LocalizationFileFormat
      • LocalizationLine
      • LocalizationLines
      • TemplateFormat
      • CultureProvider
      • FallbackCultureProvider
      • ResourceManager
      • LocalizationError
      • Microsoft.Extensions
        • Introduction
        • DependencyInjection
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        • AspNetCore
      • Pluralization
        • Introduction
        • Multiple plural parameters
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        • IPluralNumber
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      • Articles
        • Alphabet localization
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        • Emplacement
        • File localization
        • Text localization
    • Avalanche.Message
      • Introduction
      • IMessage
      • IMessageProvider
      • IMessageDescription
      • IMessageDescriptions
      • MessageLevel
      • Message printing
      • Messages and Exceptions
      • Logging
      • Validation
      • Localization
    • Avalanche.StatusCode
      • Introduction
      • HResult
        • Introduction
        • HResult.Facilities
        • BasicMessages
        • RpcMessages
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      • System
        • Introduction
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        • XmlMessages
    • Avalanche.Template
      • Introduction
      • TemplateFormats
      • ITemplatePrintable
      • ITemplateFormatPrintable
      • ITemplateText
      • ITemplateBreakdown
      • ITemplateFormat
      • ITemplateFormats
      • Extract Arguments
      • Emplacement
    • Avalanche.Tokenizer
      • Introduction
      • IToken
      • ITokenizer
      • Tokenizers
    • Avalanche.Service
      • Introduction
      • Service
        • IService
        • Construction
        • Query
        • CancellationToken
        • CachePolicy
        • Cast
        • Scope
        • Dispose
      • Handler
        • Introduction
        • IHandler
        • Cancel
        • Recursion
        • Cyclicity
        • Delegates
        • Casting
        • Invokable
        • Handlers
      • Request
        • Introduction
        • IRequest
        • [Request]
        • [ContextParameter]
        • Print Tree
      • Dependency Injection
        • Introduction
        • ServiceRequest<T>
        • Handler
        • CachePolicy
        • CancellationToken
        • QueryLogger
      • Examples
        • Expression Example
        • Mapper Example
      • ServiceMessages
    • Avalanche.Writer
      • Introduction
      • Writer
      • Referer
      • TypeCast
      • DefaultConstructor
      • DelegateWriter
      • WriterPipe
      • ConstantWriter
      • PassthroughWriter
      • Context
      • WriterMessages
    • Avalanche.Accessor
      • Introduction
      • AccessorServices
      • List
        • ListAccessor
        • ListConstructor
        • ListDeconstructor
        • ListDefaultConstructor
        • ListGet
        • ListSet
        • ListAdd
        • ListInsert
        • ListClear
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      • Map
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        • MapSet
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        • MapRemove
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        • MapReferer
      • Record
        • RecordAccessor
        • RecordConstructor
        • RecordDeconstructor
        • RecordDefaultConstructor
      • Field
        • FieldAccessor
        • FieldReader
        • FieldWriter
        • FieldReferer
      • Dependency Injection
        • Introduction
      • AccessorMessages
    • Avalanche.Emit
      • Introduction
      • TypeBuilder
      • ConstructorBuilder
      • MethodBuilder
      • PropertyBuilder
      • FieldBuilder
      • Emit
      • Utilities
    • Avalanche.DataType
      • Introduction
      • IDataTypeBase
      • IDataType
      • IRecordType
      • IFieldType
      • IUnionType
      • IListType
      • IMapType
      • IValueType
      • IEnumerationType
      • IIntegerType
      • IRealType
      • IStringType
      • IAnyType
      • DataTypeRequest
      • PrintTree
      • DataTypeMessages
    • Avalanche.FileSystem
      • Introduction
      • Abstractions
        • IFileSystem
          • IFileSystemBrowse
          • IFileSystemCreateDirectory
          • IFileSystemDelete
          • IFileSystemFileAttribute
          • IFileSystemMount
          • IFileSystemMove
          • IFileSystemObserve
          • IFileSystemOpen
        • IEvent
        • IEntry
        • IOption
        • IToken
      • FileSystem
      • VirtualFileSystem
      • MemoryFileSystem
      • EmbeddedFileSystem
      • HttpFileSystem
      • Decoration
      • IFileProvider
      • Events
      • Utilities
        • Dispose
        • File Scanner
        • Visit Tree
        • File Operation
    • Avalanche.Identity
      • Introduction
      • Identity
      • IdentityParts
      • IdentityInterner
      • IdentityComparer
      • Print Tree
      • IdentityAccessors
        • Introduction
        • TypeName
    • Avalanche.Utilities
      • Introduction
      • Collections
        • Tuples
        • StructList
        • ArrayList
        • BijectionMap
        • LocakableDictionary
        • LockableList
        • MapList
        • Pipe
        • RingQueue
        • EnumerableExtensions
        • TupleUtilities
        • ArrayUtilities
      • Comparers
        • IGraphComparer
        • IGraphComparable
        • AlphaNumericComparer
        • EnumerableComparer
        • EnumerableGraphComparer
        • ReferenceComparer
        • KeyValuePairComparer
        • DefaultComparerProvider
        • RecordComparer
      • Cloners
        • ICloner
        • IGraphCloner
        • IGraphCloneable
        • EnumerableCloner
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        • RecordCloner
        • ClonerProvider
      • Dispose
        • IDisposeAttachable
        • IDisposeBelatable
      • Provider
        • Introduction
        • ProviderBase
        • Delegate
        • Concatenation
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        • AsReadOnly
        • AsService
      • Record
        • IRecordDescription
        • IFieldDescription
        • IConstructorDescription
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        • IParameterDescription
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          • RecordCreate
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          • IRecordDelegates
        • FieldDelegates
          • FieldRead
          • FieldWrite
          • RecreateWith
          • IFieldDelegates
      • String
        • IEscaper
        • UnicodeString
      • Miscellaneous
        • IIdGenerator
        • Permutation
        • IReadOnly
        • IUserDataContainer
        • Void
    • Avalanche.Core
      • License
      • Order

    Cancel

    Service is cancelled when it is disposed, or when any of the attached cancel tokens signals close.

    .AddCancellationToken(CancellationToken) adds a cancel token to service.

    try
    {
        // Create token source
        CancellationTokenSource cancellationTokenSource = new();
        // Service collection
        IServiceCollection serviceCollection = new ServiceCollection()
            .AddHandlers<ServiceHandlers>()
            .AddCancellationToken(cancellationTokenSource.Token);
        // Create avalanche service
        using var service = serviceCollection.BuildAvalancheServiceProvider();
        // Cancel service
        cancellationTokenSource.Cancel();
        //
        IRequestFor<Type> typeRequest = new TypeRequest("System.String");
        // 
        Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
    }
    catch (OperationCanceledException oce)
    {
        Console.WriteLine(oce.Message);
    }
    

    .AddCancellationTokenSource(CancellationTokenSource) adds the token of a specific cancel token source to service.

    IServiceCollection serviceCollection = new ServiceCollection()
        .AddHandlers<ServiceHandlers>()
        .AddCancellationTokenSource(cancellationTokenSource);
    


    CancellationTokenSource can be added as ServiceDescriptor to be constructed with service.

    IServiceCollection serviceCollection = new ServiceCollection()
        .AddSingleton<CancellationTokenSource>();
    

    This source can be acquired from IServiceProvider.

    // Get cancellation token source
    CancellationTokenSource cancellationTokenSource = service.GetRequiredService<CancellationTokenSource>();
    // Cancel service
    cancellationTokenSource.Cancel();
    

    And cancel will result queries to fail, though cached results will be returned.

    try
    {
        // Service collection
        IServiceCollection serviceCollection = new ServiceCollection()
            .AddHandlers<ServiceHandlers>()
            .AddSingleton<CancellationTokenSource>();
        // Create avalanche DI service
        using var service = serviceCollection.BuildAvalancheServiceProvider();
        // Get cancellation token source
        CancellationTokenSource cancellationTokenSource = service.GetRequiredService<CancellationTokenSource>();
        // Cancel service
        cancellationTokenSource.Cancel();
        //
        IRequestFor<Type> typeRequest = new TypeRequest("System.String");
        // 
        Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
    }
    catch (OperationCanceledException oce)
    {
        Console.WriteLine(oce.Message);
    }
    

    Full Example

    Full example
    using System;
    using System.Threading;
    using Avalanche.Service;
    using Microsoft.Extensions.DependencyInjection;
    
    class di_cancel
    {
        public static void Run()
        {
            {
                // <01>
                try
                {
                    // Create token source
                    CancellationTokenSource cancellationTokenSource = new();
                    // Service collection
                    IServiceCollection serviceCollection = new ServiceCollection()
                        .AddHandlers<ServiceHandlers>()
                        .AddCancellationToken(cancellationTokenSource.Token);
                    // Create avalanche service
                    using var service = serviceCollection.BuildAvalancheServiceProvider();
                    // Cancel service
                    cancellationTokenSource.Cancel();
                    //
                    IRequestFor<Type> typeRequest = new TypeRequest("System.String");
                    // 
                    Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                }
                catch (OperationCanceledException oce)
                {
                    Console.WriteLine(oce.Message);
                }
                // </01>
            }
            {
                try
                {
                    // Create token source
                    CancellationTokenSource cancellationTokenSource = new();
                    // Service collection
                    // <02>
                    IServiceCollection serviceCollection = new ServiceCollection()
                        .AddHandlers<ServiceHandlers>()
                        .AddCancellationTokenSource(cancellationTokenSource);
                    // </02>
                    // Create avalanche service
                    using var service = serviceCollection.BuildAvalancheServiceProvider();
                    // Cancel service
                    cancellationTokenSource.Cancel();
                    //
                    IRequestFor<Type> typeRequest = new TypeRequest("System.String");
                    // 
                    Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                }
                catch (OperationCanceledException oce)
                {
                    Console.WriteLine(oce.Message);
                }
            }
    
            {
                // <03>
                try
                {
                    // Service collection
                    IServiceCollection serviceCollection = new ServiceCollection()
                        .AddAvalancheService()
                        .AddHandlers<ServiceHandlers>()
                        .AddSingleton<CancellationTokenSource>();
                    // Create microsoft DI service
                    using var msService = serviceCollection.BuildServiceProvider();
                    // Create avalanche service
                    var avService = msService.GetRequiredService<IService>();
                    // Get cancellation token source
                    CancellationTokenSource cancellationTokenSource = msService.GetRequiredService<CancellationTokenSource>();
                    //
                    IRequestFor<Type> typeRequest = new TypeRequest("System.String");
                    // 
                    Type type2 = avService.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                    // Cancel service
                    cancellationTokenSource.Cancel();
                    // 
                    Type type = avService.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                }
                catch (OperationCanceledException oce)
                {
                    Console.WriteLine(oce.Message);
                }
                // </03>
            }
            {
                try
                {
                    // Service collection
                    // <04>
                    IServiceCollection serviceCollection = new ServiceCollection()
                        .AddSingleton<CancellationTokenSource>();
                    // </04>
                    serviceCollection.AddHandlers<ServiceHandlers>();
                    // Create avalanche DI service
                    using var service = serviceCollection.BuildAvalancheServiceProvider();
                    // Get cancellation token source
                    CancellationTokenSource cancellationTokenSource = service.GetRequiredService<CancellationTokenSource>();
                    // Cancel service
                    cancellationTokenSource.Cancel();
                    //
                    IRequestFor<Type> typeRequest = new TypeRequest("System.String");
                    // 
                    Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                }
                catch (OperationCanceledException oce)
                {
                    Console.WriteLine(oce.Message);
                }
            }
    
            {
                try
                {
                    // Service collection
                    IServiceCollection serviceCollection = new ServiceCollection()
                        .AddHandlers<ServiceHandlers>()
                        .AddSingleton<CancellationTokenSource>();
                    // Create avalanche DI service
                    using var service = serviceCollection.BuildAvalancheServiceProvider();
                    // <05>
                    // Get cancellation token source
                    CancellationTokenSource cancellationTokenSource = service.GetRequiredService<CancellationTokenSource>();
                    // Cancel service
                    cancellationTokenSource.Cancel();
                    // </05>
                    //
                    IRequestFor<Type> typeRequest = new TypeRequest("System.String");
                    // 
                    Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                }
                catch (OperationCanceledException oce)
                {
                    Console.WriteLine(oce.Message);
                }
            }
            {
                // <06>
                try
                {
                    // Service collection
                    IServiceCollection serviceCollection = new ServiceCollection()
                        .AddHandlers<ServiceHandlers>()
                        .AddSingleton<CancellationTokenSource>();
                    // Create avalanche DI service
                    using var service = serviceCollection.BuildAvalancheServiceProvider();
                    // Get cancellation token source
                    CancellationTokenSource cancellationTokenSource = service.GetRequiredService<CancellationTokenSource>();
                    // Cancel service
                    cancellationTokenSource.Cancel();
                    //
                    IRequestFor<Type> typeRequest = new TypeRequest("System.String");
                    // 
                    Type type = service.GetRequired<IRequestFor<Type>, Type>(typeRequest);
                }
                catch (OperationCanceledException oce)
                {
                    Console.WriteLine(oce.Message);
                }
                // </06>
            }
        }
    }
    
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