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BUILDPLEASE.COM
A PATTERN TO DECOUPLE YOUR AGGREGATES FROM THEIR CLIENTSSEE MORE ONBUILDPLEASE.COM
WHY DELEGATES? WHY NOT CALL METHODS DIRECTLY? · NICKSEE MORE ONBUILDPLEASE.COM
LOGGING WITH NINJECT INTERCEPTION AND SERILOG The Problem I have a project with a lot of places where I want to “cross-cut” the concern of logging into. This is also called “AOP” - Aspect Oriented Programming. AOP claims to “increase modularity by allowing the separation of cross-cutting concerns by adding additional behavior to existing code (an advice) without modifying the code itself”. By managing dependencies 3 REASONS TO MODEL IDENTITY AS A VALUE OBJECT · NICK How to implement an identity as a value object using code first with Entity Framework Core. +1, particularly because of 3. Also, 1. is not purely theoretical, we in fact once had to change the underlying id from int to string once due to changing business requirements (= 2.), having a class with two possible constructors helped a lot. PUBLISHING EVENTS TO THE BUS · NICK CHAMBERLAIN Publishing Events to the Bus. When an Aggregate Root publishes an Event, what do we do with it? Looking back at why Domain Events are so important - they are how we achieve consistency with parties that are outside of transactional consistency boundaries.. There are consistency boundaries in various places, one primary boundary being the one that surrounds an Aggregate Root. A REACTIVE PROCESS MANAGER IN C# WITH AKKA.NET · NICK A while back I was looking for an example of a Process Manager written in C# with a decent commentary on what they’re all about. Unfortunately, I couldn’t find what I was looking for. IMPLEMENTING AN EVENT SOURCED AGGREGATE · NICK CHAMBERLAIN Implementing an Event Sourced Aggregate. So after completing either one extensive Design Level EventStorming session, or multiple small sessions applied to each Bounded Context, the Team feels ready to implement a working prototype of the the Domain Model to show to Nick and get feedback on their attempt to codify the Ubiquitous Language that they have learned together. DO I REALLY HAVE TO UNIT TEST THIS METHOD? · NICK CHAMBERLAINSEE MOREON BUILDPLEASE.COM
HOTSPOTS · NICK CHAMBERLAIN Then there’s Nick’s Roast Planning Inventory - The Green Bean Inventory that Nick can Allocate to his Roast Schedule safely, without scheduling and selling more Green Beans than he can roast. As they discuss this separation, Nick and the Team agree that there is a separation between what Nick has in storage and what he can allocateand roast.
HOW TO COMPARE OBJECT INSTANCES IN YOUR UNIT TESTS QUICKLYSEE MORE ONBUILDPLEASE.COM
A PATTERN TO DECOUPLE YOUR AGGREGATES FROM THEIR CLIENTSSEE MORE ONBUILDPLEASE.COM
WHY DELEGATES? WHY NOT CALL METHODS DIRECTLY? · NICKSEE MORE ONBUILDPLEASE.COM
LOGGING WITH NINJECT INTERCEPTION AND SERILOG The Problem I have a project with a lot of places where I want to “cross-cut” the concern of logging into. This is also called “AOP” - Aspect Oriented Programming. AOP claims to “increase modularity by allowing the separation of cross-cutting concerns by adding additional behavior to existing code (an advice) without modifying the code itself”. By managing dependencies 3 REASONS TO MODEL IDENTITY AS A VALUE OBJECT · NICK How to implement an identity as a value object using code first with Entity Framework Core. +1, particularly because of 3. Also, 1. is not purely theoretical, we in fact once had to change the underlying id from int to string once due to changing business requirements (= 2.), having a class with two possible constructors helped a lot. PUBLISHING EVENTS TO THE BUS · NICK CHAMBERLAIN Publishing Events to the Bus. When an Aggregate Root publishes an Event, what do we do with it? Looking back at why Domain Events are so important - they are how we achieve consistency with parties that are outside of transactional consistency boundaries.. There are consistency boundaries in various places, one primary boundary being the one that surrounds an Aggregate Root. A REACTIVE PROCESS MANAGER IN C# WITH AKKA.NET · NICK A while back I was looking for an example of a Process Manager written in C# with a decent commentary on what they’re all about. Unfortunately, I couldn’t find what I was looking for. IMPLEMENTING AN EVENT SOURCED AGGREGATE · NICK CHAMBERLAIN Implementing an Event Sourced Aggregate. So after completing either one extensive Design Level EventStorming session, or multiple small sessions applied to each Bounded Context, the Team feels ready to implement a working prototype of the the Domain Model to show to Nick and get feedback on their attempt to codify the Ubiquitous Language that they have learned together. DO I REALLY HAVE TO UNIT TEST THIS METHOD? · NICK CHAMBERLAINSEE MOREON BUILDPLEASE.COM
HOTSPOTS · NICK CHAMBERLAIN Then there’s Nick’s Roast Planning Inventory - The Green Bean Inventory that Nick can Allocate to his Roast Schedule safely, without scheduling and selling more Green Beans than he can roast. As they discuss this separation, Nick and the Team agree that there is a separation between what Nick has in storage and what he can allocateand roast.
NICK CHAMBERLAIN
Design Level EventStorming. The value of EventStorming is the active engagement that you achieve with the Domain Experts. In this case Nick and the Team are actively engaged in learning as much as they can, as quickly as possible about Nick’s Domain: A Roast-to-Order CoffeeBusiness.
PUBLISHING EVENTS TO THE BUS · NICK CHAMBERLAIN Publishing Events to the Bus. When an Aggregate Root publishes an Event, what do we do with it? Looking back at why Domain Events are so important - they are how we achieve consistency with parties that are outside of transactional consistency boundaries.. There are consistency boundaries in various places, one primary boundary being the one that surrounds an Aggregate Root. MORE EFFICIENT DOMAIN MODELING WITH EVENTSTORMING · NICK EventStorming is a really efficient way to model your domain around what it should be modeled around - the business and the knowledge that domain experts have about it. It “blends lean and the theory of constraints into software development and domain-driven design” - WHAT'S BETTER: BAD TESTS OR NO TESTS AT ALL?... · NICK If you’re (rightfully) worried about writing bad tests, it’s good to be able to anticipate the consequences of writing bad tests. Gojko describes two axes for categorizing tests. On one axis, we have the maintenance costs of tests. Obviously, we want to avoid costly tests. On the other axis is how well the test detect risk. A BETTER WAY TO PROJECT DOMAIN ENTITIES INTO DTOS · NICK A Better Way to Project Domain Entities into DTOs. Imagine you have a nicely designed Domain Layer that uses Repositories to handle getting Domain Entities from your database with an ORM, e.g. Entity Framework, into an MVC view or a Web API controller.. Problem is, the Presentation Layer needs objects of a different shape than your DomainLayer Aggregates.
TESTING AN EVENT SOURCED AGGREGATE ROOT · NICK CHAMBERLAIN We’re going to use my preferred xUnit, Moq, and FluentAssertions testing framework “stack” to write tests. With the Event Sourced Aggregate Root, we want to test that a Command successfully transitions the state of the Aggregate, and emits an Event signifying the success of this state transition. By designing the RoastScheduleAggregate
AGGREGATE EVENT PERSISTENCE · NICK CHAMBERLAIN In a Persistence-Oriented Repository, persisting the state of the Aggregate to storage would happen by calling its Save method after this state transition. All changes in state up until that point are still in memory. Calling Save would then use an ORM to persist this new object (or object with state changed) to the SQL database. HOW TO MAP NESTED JSON OBJECTS TO A .NET DICTIONARY · NICK How to Map Nested JSON Objects to a .NET Dictionary. Sometimes a public JSON API responds in a format that you can’t control. For example, nested objects instead of an array: SHOULD YOU USE A CQRS FRAMEWORK? · NICK CHAMBERLAIN If you’re just getting into the patterns around CQRS, I’d suggest avoiding frameworks. It’s important to remember that CQRS and Event Sourcing are patterns. Like the Gang of Four patterns, they offer a way to communicate architectural decisions. THROWING AN INVALID CAST EXCEPTION?... LOOK OUT FOR Throwing an Invalid Cast Exception? Look Out for Unboxing. Implicit and explicit numeric casts are usually pretty straightforward: int i = 5; float f = i; // Implicit cast from Int32 to Single Byte b = (Byte) i; // Explicit cast from Int32 to Byte HOW TO COMPARE OBJECT INSTANCES IN YOUR UNIT TESTS QUICKLYSEE MORE ONBUILDPLEASE.COM
WHY DELEGATES? WHY NOT CALL METHODS DIRECTLY? · NICKSEE MORE ONBUILDPLEASE.COM
A PATTERN TO DECOUPLE YOUR AGGREGATES FROM THEIR CLIENTSSEE MORE ONBUILDPLEASE.COM
LOGGING WITH NINJECT INTERCEPTION AND SERILOG The Problem I have a project with a lot of places where I want to “cross-cut” the concern of logging into. This is also called “AOP” - Aspect Oriented Programming. AOP claims to “increase modularity by allowing the separation of cross-cutting concerns by adding additional behavior to existing code (an advice) without modifying the code itself”. By managing dependencies 3 REASONS TO MODEL IDENTITY AS A VALUE OBJECT · NICKA REASON TO LIVEMUST BE A REASONTHERE MUST BE A REASON How to implement an identity as a value object using code first with Entity Framework Core. +1, particularly because of 3. Also, 1. is not purely theoretical, we in fact once had to change the underlying id from int to string once due to changing business requirements (= 2.), having a class with two possible constructors helped a lot. PUBLISHING EVENTS TO THE BUS · NICK CHAMBERLAIN Publishing Events to the Bus. When an Aggregate Root publishes an Event, what do we do with it? Looking back at why Domain Events are so important - they are how we achieve consistency with parties that are outside of transactional consistency boundaries.. There are consistency boundaries in various places, one primary boundary being the one that surrounds an Aggregate Root. THE BUS · NICK CHAMBERLAIN The answer is the Bus. “Typically, the bus is a singleton. It receives requests to execute commands and event notifications. The bus doesn’t actually do any concrete work. It just selects a registered component to process the command or handle the event. The bus holds a list of known business processes triggered by commands and events HOTSPOTS · NICK CHAMBERLAIN Then there’s Nick’s Roast Planning Inventory - The Green Bean Inventory that Nick can Allocate to his Roast Schedule safely, without scheduling and selling more Green Beans than he can roast. As they discuss this separation, Nick and the Team agree that there is a separation between what Nick has in storage and what he can allocateand roast.
SINGLETON INDEXER
Singleton Indexer - A Workaround for not having Static Indexers in C#. Indexers are used to simplify access to a collection that is encapsulated in a class you’re designing. From MSDN: class SampleCollection { private T arr = new T; public T this { get { return arr; } set { arr = value; } } } SampleCollection stringCollection = new SampleCollectionDetails
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