Stratara.Projections 4.4.9

Prefix Reserved
.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package Stratara.Projections --version 4.4.9
                    


                    

                
NuGet\Install-Package Stratara.Projections -Version 4.4.9
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Stratara.Projections" Version="4.4.9" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Stratara.Projections" Version="4.4.9" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Stratara.Projections" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Stratara.Projections --version 4.4.9
                    


                    

                
#r "nuget: Stratara.Projections, 4.4.9"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Stratara.Projections@4.4.9
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Stratara.Projections&version=4.4.9
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Stratara.Projections&version=4.4.9
                    


                            Install as a Cake Tool

Stratara.Projections

Derived. The behaviour described here is specified under openspec/specs/. Those specifications are the source; this page explains and illustrates them.

License: MIT.

Projection runtime for the Stratara event-sourced stack. Discovers IProjection implementations in the consumer's application assemblies, dispatches event bundles to them, and applies the resulting change sets atomically via the read-model repository layer.

What's in the box

Folder Contents
Services/ The runtime, all internal: ProjectionManager (event-bundle → matching projection-handlers fan-out), ProjectionHandler (invokes a projection's matching methods), ProjectionMethodInvoker (reflection-cached method-pointer dispatch into consumer projections). You implement IProjection; these drive it
Abstractions/ IProjection and its refinements: IRebuildableProjection (can be rebuilt alone on the Orleans execution model) and IForgetsDeletedTenants (a fact recorded for a tenant after its deletion is passed over instead of failing the projection; the record is kept by IForgottenTenantStore, which the read store provides), and IReadModelPreservation (lets a failed replay restore the read models it emptied; the PostgreSQL implementation comes with AddReadModelRestore<TReadContext>())
Multitenancy/ TenantProjection — the framework's own opinionated tenant aggregate projection. Skip the registration if your application has its own tenancy model
Diagnostics/Extensions/ Source-generated LoggerProjectionExtensions, LoggerChangeSetExtensions, LoggerUpdateExtensions — typed [LoggerMessage] surfaces under the Stratara.Projection.* / Stratara.ChangeSet.* / Stratara.Update.* event-ID bands

Quick start

// In your EventProjection worker:
builder.Services
    .AddProjectionWorker(builder.Configuration)                       // the runtime + hosted service
    .AddProjectionsFromAssemblyContaining<MyAppProjectionMarker>();   // your IProjection implementations

Then implement IProjection in your application assembly. The projection manager picks them up automatically.

Both calls are needed: AddProjectionsFromAssemblyContaining<T>() only registers your projections — AddProjectionWorker(IConfiguration) registers the manager, the invoker and the hosted service that consumes the event-bundle subscription. Without it nothing drives your projections. Most hosts get both from the AddEventProjectionWorkerServices() composite in Stratara.EventSourcing.WorkerDefaults.

No checkpoint store. Projections are driven push-wise off the event bus; the framework keeps no per-projection checkpoint, so there is no consumer-lag metric and no built-in resume-from-sequence. Replay is coordinated separately (see Stratara.Outbox.RabbitMQ's replay state).

Dependencies

  • Stratara.Contracts — for EventBundle + IEvent<T>.
  • Stratara.Domain — for the framework's Tenant aggregate (only consumed by TenantProjection).
  • Stratara.Shared — for change-tracking primitives, reflection cache, partitioning helpers, diagnostics base.
  • Microsoft.Extensions.Hosting.Abstractions + Microsoft.Extensions.Options.ConfigurationExtensions — for projection-worker checkpointing options.
  • JetBrains.Annotations — for static-analysis attributes on projection-handler conventions.
Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (3)

Showing the top 3 NuGet packages that depend on Stratara.Projections:

Package Downloads
Stratara.EventSourcing.EntityFrameworkCore

EF Core persistence for the Stratara event-sourced stack on PostgreSQL — write-store, read-store, ASP.NET Identity store — including a shared identity store with its migrations — shared conventions, value generators, and UnitOfWork primitives. Targets Npgsql; maps pgvector types for a model that uses them, and needs no database extension otherwise.
Stratara.EventSourcing.WorkerDefaults

Worker-host wiring composites for the Stratara event-sourced stack. IHostApplicationBuilder extensions (AddBackendServices, AddCommandWorkerServices, AddHeavyCommandWorkerServices, AddEventProjectionWorkerServices, AddEventStreamHashWorkerServices, AddSagaWorkerServices, AddOutboxWorkerServices, and AddCommandServices, AddEventProjectionServices and AddSagaServices without the bus-fed workers) bundle the per-concern DI calls so each worker host opts in with one line.
Stratara.Orleans

The Orleans execution model for the Stratara event-sourced stack — one activation per aggregate across the cluster, commands recorded before the call returns and resumed after a crash, projections and sagas that read the store in commit order from a checkpoint, singleton work, owner-checked durable timers and heavy work bounded across the cluster.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
4.8.0 210 11/6/2026
4.7.1 177 11/5/2026
4.7.0 597 10/30/2026
4.6.1 165 10/29/2026
4.6.0 231 10/28/2026
4.5.0 321 10/28/2026
4.4.10 267 10/26/2026
4.4.9 173 10/26/2026
4.4.8 320 10/24/2026
4.4.7 174 10/23/2026
4.4.6 280 10/22/2026
4.4.5 366 10/14/2026
4.4.4 348 10/10/2026
4.4.3 182 10/10/2026
4.4.2 444 10/2/2026
4.4.1 433 9/29/2026
4.4.0 186 9/27/2026
4.3.1 191 9/25/2026
4.3.0 353 9/23/2026
4.2.0 230 9/18/2026
Loading failed

A fix for hosts on the Orleans execution model. A host that removed or renamed a projection no longer has that
projection's store readers come back on every start and fail each entry; they retire once, as a saga's readers do. A
retired store reader now logs its retirement once instead of three times, and leaves no reminder error behind. No
API change, no schema change and no migration.

### Fixed

- **A reader of a removed projection retires.** On the Orleans execution model, a host that removed or renamed a
 projection kept the keep-alive reminders of its store readers. On every start of the silo they brought the readers
 back, and each one read the next entry of its partition, failed it because no projection of its name was
 registered, and tried again on the next tick, without end — a warning per partition and entry. Such a reader now
 retires the first time it is brought back, as a saga's reader already did: it unregisters its keep-alive, logs
 `117_136` `UnregisteredProjectionReaderRetired` (Information) once, reads nothing and deactivates. Its checkpoints
 stay, so a projection registered again resumes where it stopped; *Operate the Orleans execution model* says how to
 delete them. In a rolling deployment that adds a projection, a reader that lands on a silo of the earlier version
 refuses a rebuild's or a replay's pause, which then fails naming it, and a wait counts its partition as behind.
- **A retired store reader logs its retirement once.** A reader that retired as it was activated — of a partition
 beyond a lowered partition count, or of a saga the silo no longer registers — deactivated before it answered the
 call that activated it. Orleans forwarded that call to a new activation, which retired again, so the retirement was
 logged three times per reader and the keep-alive tick ended in `Could not deliver reminder tick` at Error. The
 reader now answers the call first and deactivates after it.