OrderAttribute

[Order(long)] attribute can be placed on class to indicate evaluation order. Handlers are evaluated in order of assigned order values. Smaller value is evaluated earlier.

[Order(1_000_000_000)]
public class Handler : IHandler<TypeRequest, Type>
{
    public void Handle(IQuery<TypeRequest, Type> query)
    {
        // Already handled
        if (query.Handled()) return;
        // Assign result
        query.Response.SetValue(typeof(string));
    }
}

[Order(long)] attribute can be placed on Handle() method to indicate evaluation order.

public class Handler02 : IHandler<TypeRequest, Type>, IHandler<ScopedServiceRequest<IList>, IList>
{
    [Order(1000)]
    public void Handle(IQuery<TypeRequest, Type> query)
    {
    }

    [Order(2000)]
    public void Handle(IQuery<ScopedServiceRequest<IList>, IList> query)
    {
    }
}

Full Example

Full example

using System;
using System.Collections;
using Avalanche.Service;

public class handler_orderattribute
{
    // <01>
    [Order(1_000_000_000)]
    public class Handler : IHandler<TypeRequest, Type>
    {
        public void Handle(IQuery<TypeRequest, Type> query)
        {
            // Already handled
            if (query.Handled()) return;
            // Assign result
            query.Response.SetValue(typeof(string));
        }
    }
    // </01>

    // <02>
    public class Handler02 : IHandler<TypeRequest, Type>, IHandler<ScopedServiceRequest<IList>, IList>
    {
        [Order(1000)]
        public void Handle(IQuery<TypeRequest, Type> query)
        {
        }

        [Order(2000)]
        public void Handle(IQuery<ScopedServiceRequest<IList>, IList> query)
        {
        }
    }
    // </02>
}