Dependency Injection

.AddAvalancheAccessor() extension method (Avalanche.Accessor.DependencyInjection.dll) adds support for accessor service requests.

// Create Dependency Injection service
IServiceProvider service =
    new ServiceCollection()
    .AddAvalancheService()
    .AddHandlers(NetAccessorHandlers.Instance)
    .AddCachePolicy(CachePolicies.Default)
    .AddAvalancheAccessor()
    .BuildServiceProvider();

IServiceProvider.GetService(IRecordAccessor<Record>) is forwarded as request to service stack as RecordAccessorRequest, which is handled by service stack. Default handlers use type builder to construct record and field accessors.

// Request accessor service
IRecordAccessor<MyRecord> recordAccessor =
    service.GetRequiredService<IRecordAccessor<MyRecord>>();
// Create record
MyRecord myRecord = recordAccessor.DefaultConstructor.Read(default);
// Write "Name" field
recordAccessor.Fields[1].Writer.WriteAs<string, MyRecord>("ABC", myRecord);

IListAccessor<List> is forwarded to service stack as ListAccessorRequest.

// Request accessor service
IListAccessor<int[]> listAccessor =
    service.GetRequiredService<IListAccessor<int[]>>();
// Use accessor
int[] array = listAccessor.DefaultConstructor.Read(default);

IListAccessor<List, Element> also is forwarded as ListAccessorRequest.

// Request accessor service
IListAccessor<int[], int> listAccessor2 =
    service.GetRequiredService<IListAccessor<int[], int>>();

And IMapAccessor<Map> is forwarded as MapAccessorRequest.

// Request accessor service
IMapAccessor<Dictionary<string, int>> mapAccessor =
    service.GetRequiredService<IMapAccessor<Dictionary<string, int>>>();
// Use accessor
Dictionary<string, int> map = mapAccessor.DefaultConstructor.Read(default);

IMapAccessor<Map, Key, Value> is also forwarded as MapAccessorRequest.

// Request accessor service
IMapAccessor<Dictionary<string, int>, string, int> mapAccessor2 =
    service.GetRequiredService<IMapAccessor<Dictionary<string, int>, string, int>>();

Full Example

Full example

using System;
using System.Collections.Generic;
using Avalanche.Accessor;
using Avalanche.Service;
using Avalanche.Writer;
using Microsoft.Extensions.DependencyInjection;

public class dependencyinjection
{
    public static void Run()
    {
        {
            // <01>
            // Create Dependency Injection service
            IServiceProvider service =
                new ServiceCollection()
                .AddAvalancheService()
                .AddHandlers(NetAccessorHandlers.Instance)
                .AddCachePolicy(CachePolicies.Default)
                .AddAvalancheAccessor()
                .BuildServiceProvider();
            // </01>
            // <02>
            // Request accessor service
            IRecordAccessor<MyRecord> recordAccessor =
                service.GetRequiredService<IRecordAccessor<MyRecord>>();
            // Create record
            MyRecord myRecord = recordAccessor.DefaultConstructor.Read(default);
            // Write "Name" field
            recordAccessor.Fields[1].Writer.WriteAs<string, MyRecord>("ABC", myRecord);
            // </02>
            // <03>
            // Request accessor service
            IListAccessor<int[]> listAccessor =
                service.GetRequiredService<IListAccessor<int[]>>();
            // Use accessor
            int[] array = listAccessor.DefaultConstructor.Read(default);
            // </03>
            // <04>
            // Request accessor service
            IListAccessor<int[], int> listAccessor2 =
                service.GetRequiredService<IListAccessor<int[], int>>();
            // </04>
            // Use accessor
            int[] array2 = listAccessor2.DefaultConstructor.Read(default);
            // <05>
            // Request accessor service
            IMapAccessor<Dictionary<string, int>> mapAccessor =
                service.GetRequiredService<IMapAccessor<Dictionary<string, int>>>();
            // Use accessor
            Dictionary<string, int> map = mapAccessor.DefaultConstructor.Read(default);
            // </05>
            // <06>
            // Request accessor service
            IMapAccessor<Dictionary<string, int>, string, int> mapAccessor2 =
                service.GetRequiredService<IMapAccessor<Dictionary<string, int>, string, int>>();
            // </06>
            // Use accessor
            Dictionary<string, int> map2 = mapAccessor2.DefaultConstructor.Read(default);
        }
    }

    // <00>
    public class MyRecord
    {
        public int Id = 0;
        public string Name = null!;
    }
    // <00>
}