Masstransit saga example.

Masstransit saga example MassTransit follows the conventions above to obtain the CorrelationId used to create a new or load an existing saga instance. Using message sessions as saga persistence, you can only use Azure Service Bus for both messaging and saga persistence purposes, without needing any additional infrastructure. Developers can create their own activities for state machine use, and optionally create their own extension methods to add them to a behavior. The code below is based upon the sample application. And in this scenario, it is usually desirable to do this atomically in a transaction. It is important to note that even though publishing the OrderValidated event is technically occurring prior to the transition to Validated, the consumption of the event is occurring after the transition to Validated state (we There is a good set of examples opentelemetry-dotnet how it can be used for different cases. Definitions. It is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. – Mar 25, 2021 · The message type is only included in the first example's source code. A circuit breaker is used to protect resources (remote, local, or otherwise) from being overloaded when in a failure state. MassTransit has basic support for receiving messages and delivering those messages to a consumer as a Batch. Mar 15, 2023 · We use Masstransit 8 and saga state machines and we have a business flow with multiple sagas communicating with each other and also other external services. MassTransit supports consumer sagas, which implement one or more interfaces to consume correlated saga events. In order to store the saga state, you need to use one form of saga persistence. Sagas must have a CorrelationId, it is the primary key used by the saga repository and the way messages are correlated to a specific saga instance. A service sends a request to another service and continues after receiving the response. Jun 6, 2022 · Before the question, I'll paste sample code and the image output from visualizer. If specified, MassTransit will give up after the timeout has expired. Start() - start the timers, and capture of messages Mar 28, 2013 · MassTransit Courier is a great way to compose dynamic processing steps into a routing slip that can be executed, monitored, and compensated in the event of a fault. When combined with a saga state machine, routing slips create a robust, recoverable, and maintainable approach to message processing across multiple services. Ignore()) handler that would discard the remove order message if the saga doesn't exist. We have configured generic message retry for unhandled exceptions that will retry 5 times with a 30 seconds delay. Compensation can Mar 31, 2021 · Testing a MassTransit saga with scheduled events Hot Network Questions Why does the Trump administration have a comparatively balanced and diplomatic approach on the India-Pakistan issue? Entity Framework. page/masstransit-saga☄️ Master the Modular Monolith Architecture: https://bit. Because of MassTransit's asynchronous underpinning, unit testing consumers, sagas, and routing slip activities can be significantly more complex. Feb 1, 2021 · I'm learning MassTransit's StateMachine, it's helpful in my usecase, really like it, now I would like to learn more about how to use Activity properly but it's hard to find document/examples, please help me with some questions: Marten can create indices for properties, which greatly increases query performance. While in many cases it is best to avoid request Because the InMemoryOutbox delays publishing and sending messages until after the consumer or saga completes, the created container scope will have been disposed. This support is included so that it is easy to move applications from other saga implementations to MassTransit. Clone the sample: GitHub Repository (opens new window) # Sample Library. git Without persistent state, a saga would consider each event a new event, and orchestration of subsequent events would be meaningless. Shows how to use the Particular Platform to manage MassTransit faults. If you use int - it is the hardest to understand by looking at the value, since it has come convention like zero is no state, one is the initial state, 2 is the final state and 3 Feb 14, 2020 · It may, however, perform better if writes are performed in batches. I used this code in my events (both the events) Some security teams may initially balk at the necessity for your application to have the management role. To understand sagas and how to create one, refer to the Saga section. Contribute to Gotcha7770/Orders. If there are multiple consumers (or saga) on the same endpoint (which could potentially get you on the naughty list), and the retry/redelivery behavior should only apply to a specific consumer or saga, the same configuration can be applied specifically to the consumer or saga. Dec 31, 2019 · Thanks for answer! That was not my problem, I handle faulds in custom saga state. Saga Correlation. The example below shows the code-first approach to using NHibernate for saga persistence. The custom serializers / deserializer implementations leverage the wire format used by the standard Confluent schema-based serializers, which includes the schema id in the data stored for each message. App. Marten can create indices for properties, which greatly increases query performance. I wanted to see if anyone could provide a simple solution that uses a consumer saga. ReportFailed console applications to consume request results. Sample Library. Consumer sagas implement one or more interfaces to consume correlated saga events. Oct 13, 2022 · Previously I was using an in-memory saga repository, so adding another variable to the saga instance class wasn't a bit deal. The controller has no knowledge of MassTransit, and the registration service uses IPublishEndpoint to publish a domain event which is written to the Registering Sagas with MassTransit. Shown above is an empty definition of a saga state machine. But, of course, in real-world cases, we prefer to host orchestrator and workers separately, using The example above uses the in-memory saga repository, but any saga repository could be used. The CorrelationId will be the primary key, and CurrentState will be used to store the current state of the saga instance. In this scenario, an order request is submitted to the Saga orchestrator. Variables are consistent throughout the message creation, using the same variable multiple times returns the value. An introduction to use Saga Patterns with Masstransit and MongoDB. The outbox components are included in the MassTransit. StartTimeout: By default, MassTransit waits infinitely until the broker connection is established. Saga State Machines(状态机) Saga State Machines(状态机)以前被称为Automatonymous，从v8开始被合并到masstrtransit代码库中。 Nov 7, 2015 · Actually my command initiates other saga, which publish IMyRequestDone at the end of processing without marking saga completed. May 28, 2023 · 翻译自 Saga State Machines. Jan 14, 2021 · Consumer sagas, for lack of a better name, are the original sagas implemented by MassTransit when it was created 13 years ago. Managing faults with the Particular Platform. Contracts. Service. Saga State Machine Implementation with Masstransit - selcukusta/masstransit-saga-implementation Jul 7, 2024 · MassTransit is a robust, open-source distributed application framework for . Тут будет пример простого проекта на MassTransit который я считаю более удобным и лаконичным чем NServiceBus. To test the state machine, see the testing section. (Need to complete them at some time later. Sample Twitch. The code below configures both the bus outbox and the consumer outbox using the default settings. Alternatively, a collection name formatter can be specified using the CollectionNameFormatter method. MassTransit is an asynchronous framework that enables the development of high-performance and flexible distributed applications. My problem was in Saga misconfiguration - one of consumers was wrongly pointed to Saga queue and handle messages of type he does not know. 在MassTransit 中MassTransitStateMachine就是状态机的具体抽象，可以用其编排一系列事件来实现状态的流转，也可以用来实现Saga模式的分布式事务。并支持与EF Core和Dapper集成将状态持久化到 NHibernate is a widely used ORM and it is supported by MassTransit for saga storage. public class OrderState : SagaStateMachineInstance { public Guid CorrelationId { get ; set ; } public string CurrentState { get ; set ; } public DateTime ? Saga Correlation. And you could set up an Initially(When(RemoveOrder). I want to try and use a consumer saga for my next project, but I have been unable to find an example that uses it. Example using masstransit sagas. NET. How can I add OutBox to MassTransit without saga? I added extensions to the database context and called the AddEntityFrameworkOutBox method when configuring MassTransit. That request can even be specified as ReadOnly, so that it doesn't modify the state (or attempt to save the unmodified state). This support is included so that MassTransit. 0, where I used RabbitMQ as the message broker and MongoDB Feb 13, 2024 · In microservices development, we often deal with complex code for handling transactions between services, typically involving verbose try-catch blocks. These tools often provide Jan 5, 2024 · Example: Using MassTransit for Saga Implementation. NET API projects and three class libraries in this scenario as you can see in Figure 4. Should I use the EFCore DbContext that is used as persistance for MassTransit as a regular DbContext? Is there an existing way to better communicate this data store is not for writing outside masstransit? This sample shows how to use MassTransit with Kafka. Sophisticated systems need to schedule things, and MassTransit has extensive scheduling support. To ensure consistency in distributed systems, the Saga pattern offers a straightforward approach. Now, you could use Quartz to schedule a future message to finalize the saga, which doesn't do any business logic, but only removes the saga instance. Most of the time, waiting for the response is a blocking operation – the requester waits for the response before it continues processing. This sample was created along Saga Guidance. Middleware. This is also good news for interoperability with non-MassTransit applications. And when bad things happen, exceptions get thrown. A pipe is composed of a series of filters, each of which is a key atom and are described below. SubmitForm console application to send IReportRequestCommand. When using job consumers for production use cases, configuring durable saga repositories is highly recommended to avoid Entity Framework. While consuming a message, a saga may send commands and/or publish events. saga: Number of messages processed by saga: Saga Correlation. Saga state machine events are used to add behavior to a saga state machine, such as adding or updating saga state machine instance data, publishing or sending messages, and changing the instance's current state. In this example, databases would be used. This sample project was developed with . Templates. String Instance State. Lifecycle Controlling methods await harness. There are several types of storage that MassTransit supports, all of those, which are included to the main distribution, are listed Feb 11, 2016 · I have defined the following state machine in Masstransit: public class OrderStateMachine : MassTransitStateMachine&lt;OrderState&gt; { public OrderStateMachine() { InstanceState(x Without persistent state, a saga would consider each event a new event, and orchestration of subsequent events would be meaningless. Contribute to welhell/masstransit-saga-example development by creating an account on GitHub. MassTransit also supports variables, which are special types added to the anonymous object. May 10, 2020 · MassTransit. Start Sample. By default, MassTransit connects to the broker asynchronously. You can define a request contract, which is handled by the saga, allowing the saga itself to respond with the current state/details. There are several types of storage that MassTransit supports, all of those, which are included to the main distribution, are listed This is an example project of transactional Saga using Masstransit. For example, receiving one hundred messages and then writing the content of those messages using a single storage operation may be significantly more efficient (and faster). May 10, 2022 · Я делал саги и через MassTransit и через NServiceBus. states. Most teams value the developer productivity that comes with MassTransit managing the topics, queues, and subscriptions for them. What follows is a set of guidelines related to sagas that was collected from Discord, Stack Overflow, and other sources to provide an easy way to link answers to commonly asked questions. Dec 18, 2020 · Saves the saga instance to the saga repository; Having multiple TransitionTo activities in a state machine is allowed, but the saga instance will only be saved with the last state after all activities have completed. Step 1. To simplify the creation of unit and integration tests, MassTransit includes a Test Harness that simplifies test creation. Uses MassTransit. They were consumers with state and used variants of IConsumer<T> to direct messages to saga instances. I'm currently correlated those "external" messages based on a string and this is working fine so far in terms of associating them with the proper saga MassTransit Saga example. Sep 12, 2023 · When disabling RabbitMq to emulate a bus crash, no records of unpublished events appear in the database. Mar 1, 2023 · The saga is working and tested, but now I want to implement the part where I can query the state information. For example, a remote web site may be unavailable and calling that web site in a message consumer takes 30-60 seconds to time out. Configuration Usage Telemetry Patterns Saga Overview Mar 28, 2022 · MassTransit has an easy facility for accessing the state of a saga. May 12, 2021 · This isn't a complete example that you can copy paste, but it contains the parts we needed to get it working. Event. EntityFramework. I've created the DbContext a MassTransit implements several message patterns, making it easy for developers to apply those patterns to their applications. Configuring Sagas. Saga development by creating an account on GitHub. There are four. Entity Framework. Request/response is easily the most commonly used integration pattern. But it's greate to know DuringAny does not meen Initially. Along with the state, interfaces may be added to the saga class to define the events handled by the saga. However MassTransit is an asynchronous framework that enables the development of high-performance and flexible distributed applications. MassTransit использует Saga c оркестратором. The job service uses three saga state machines and the default configuration uses an in-memory saga repository, which is not durable. In MassTransit, sagas are message handlers that maintain state. In a saga state machine, an event is used to correlate a message to a saga state machine instance. Sagas are automatically configured when ConfigureEndpoints is called, which is highly recommended. This approach can be implemented using libraries such as Automatonymous for . public class OrderState : SagaStateMachineInstance , ISagaVersion { public Guid CorrelationId { get ; set ; } public string CurrentState { get ; set ; } public DateTime ? Jul 1, 2021 · As you can see, each worker service uses its own table, but they all are located in the same DB. In the example below, an order saga initiated by a SubmitOrder message is defined. An example saga instance is shown below, which is orchestrated using an Automatonymous state machine. The first Enter1 message is published successfully and the saga receives it, but how to send a message to kafka from the saga is not clear Jun 2, 2024 · The motivation for writing this article is my recent effort to understand how sagas work using MassTransit over the past few weeks, which led me to search for working examples. saga: Number of messages processed by saga: The code below is based upon the sample application. Clone the sample: GitHub Repository (opens new window) # Sample Twitch. . A consumer saga is a class, identified by a CorrelationId, that defines the state persisted by a saga repository. The routing slip is tracked using a saga, and can compensate when an activity faults. UseInMemoryDatabase(TestDatabaseName) . Then, once completed, the instance is removed from the saga repository (with SetCompletedWhenFinalized). Схема приложения с использованием Saga от MassTransit: Для использования Saga изменим класс Program консольного клиента: Jan 26, 2021 · It looks like a OrderValidated event is occurring while the state is Validated - which is currently unhandled (only CheckoutSessionCreatedEvent is handled at the moment). masstransit. Today, I'll walk you through implementing this pattern using MassTransit, a reliable framework for orchestrating distributed systems. When set to true, the MassTransit Hosted Service will block startup until the broker connection has been established. Let's consider a scenario of an e-commerce platform where a user places an order, triggering multiple actions like inventory deduction, payment May 4, 2020 · Each saga instance has a unique correlation identifier, and as long as those messages can be correlated to that single instance, MassTransit will manage the concurrency (either optimistic or pessimistic, and depending upon the saga storage engine). Clone Jan 17, 2023 · The Saga is a pattern for managing processes and failures on distributed services. If your saga is correlating events using other saga properties, index creation is recommended. AspNetCore (opens new window), MassTransit. ly/3 Partitioned Queues. If you're new to MassTransit, start with this sample to understand how MassTransit works. Jul 8, 2021 · Finalize just transitions the state to final, it doesn't prevent subsequent activities from executing during the current event behavior. Saga console application to manage transaction state. Let's face it, bad things happen. I'd suggest reviewing the state machine in the sample, and seeing how that compares to your scenario. Sagas allow you to coordinate actions across multiple services while maintaining data consistency and reliability. # Consumer Sagas. RequestException: 'Only one handler of type MassTransit. To configure a specific consumer. I don't understand how to produce message up there The bus configuration is identical to the one in the documentation. Options; private readonly ServiceProvider _serviceProvider RabbitMQ Transport. Job Saga State Machines Job consumers use three saga state machines to orchestrate jobs and keep track of available job consumer bus instances. messaging. Saga definitions are used to specify the behavior of consumers so that they can be automatically configured. NET or Hangfire, where the scheduler runs in a service and schedules messages using a Sagas. Features used: Courier; Automatonymous; Clone the sample: GitHub Repository # Container. Jan 2, 2023 · 本文将重点介绍MassTransit中的状态机在Saga 模式中的应用。 MassTransit StateMachine. Jul 5, 2015 · The saga I've written is initiated by and initiates actions based on external events, none of which are in response to anything the saga has initiated, so naturally none of them have a Guid set. ISampleRequest> can be registered' Or the right approach is to use different response message when exception occurs? Something like this: Marten can create indices for properties, which greatly increases query performance. The InstanceState method is used to configure the property, in the example below the string property type is used. saga: Number of messages processed by saga: MassTransit includes a job service that keeps track of each job, assigns jobs to service instances, and schedules job retries when necessary. However, message brokers typically do not participate in transactions. com/welhell/masstransit-saga-example. The orchestrator publishes message and the consumers will process the request, calling an (fake) api to debit account and an external (fake) api to confirm the order. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). Sagas are added inside the AddMassTransit configuration using any of the following methods. This combination of state and behavior in a single class is a consumer saga. Beyond basic routing slip functionality, MassTransit also supports compensations, allowing activities to store execution data so that reversible operations can be undone. Jun 30, 2023 · Saga/state machine support: MassTransit provides a saga/state machine framework, which helps manage long-running, multi-step processes in distributed systems. – A consumer saga is a class, identified by a CorrelationId, that defines the state persisted by a saga repository. An example saga is shown below. Apr 5, 2017 · If you use string (all MassTransit examples suggest this) - it is obvious that the property will contain the state name, representing the state machine property name. Concurrency. https://github. When used in combination with the existing saga features of MassTransit, it is possible to coordinate a distributed set of services into a reliable and supportable system. public class UpdateSagaTests { private const string TestDatabaseName = "saga-test-db"; private readonly DbContextOptions<DataContext> _options = new DbContextOptionsBuilder<DataContext>() . MassTransit is built using a network of pipes and filters to dispatch messages. NET Core, including: Microsoft Extensions Dependency Injection container configuration, including consumer, saga, and activity Let's face it, bad things happen. This is just the start, however, as there is much more to be done. Even if a message broker did support transactions, it would require two-phase commit (2PC) which should be avoided whenever The latter give us an ability to use this feature as saga state storage. The most common reasons include: There are scenarios when an event behavior may have dependencies that need to be managed at a scope level, such as a database connection, or the complexity is best encapsulated in a separate class rather than being part of the state machine itself. And when exceptions get thrown, people die. Between messages, the saga instance state is persisted using a database. Instead of dealing with distributed transactions, you get clear state management, automatic compensation for failures, and the ability to handle long-running operations without blocking resources. All you do is add the config for the one you want, and on startup it will try to connect to the message broker that has config values present. Without persistent state, a saga would consider each event a new event, and orchestration of subsequent events would be meaningless. # ASP. The persistence section includes details on the supported saga repositories. Mar 27, 2020 · # Configuring for a consumer or saga. An initial message creates a saga instance and subsequent messages may correlate to the same instance. Check on every MyRequestDone message: The in-memory transport is intended for use within a single process only. In early days of software development, blocking could limit overall system throughput. RabbitMQ is an open-source message broker software that implements the Advanced Message Queuing Protocol (AMQP). Circuit Breaker. Apr 7, 2022 · Is there're a sample of using Sagas with EF Core as a repository? I plan on using MsSQL as a persistence repository, and it seems that EF Core is the only way for that. Workflow-based Saga: Using a workflow engine like NServiceBus or MassTransit, you can define workflows that represent the saga. ReportCreated and Sample. ) So instead of saving number of completed nested sagas in parent saga I just query state of child saga instances. Kafka (via Confluent Cloud) MongoDB and problem with that is, that I don't see a way declaratively to define then and else activity callbacks, they would need to be either hardcoded in CustomActivity itself - which is not reusable or take then/else as custom activity's dependencies - again that would be configured when registering in IoC, which is not flexible and may be not reusable (haven't thought about it much). This sample was created along with Season 2 Apr 27, 2021 · MassTransit includes Automatonymous, which provides a powerful state machine syntax to create sagas. The most common reasons include: Request/response is a commonly used message pattern where one service sends a request to another service, continuing after the response is received. Clone the sample: GitHub Repository. We have been using MassTransit for queuing with RabbitMQ for around a year now. Networks partition, servers crash, remote endpoints become non-responsive. Jul 8, 2024 · Each step in the saga represents a state, and the transitions are the events that trigger the next state. public class OrderState : SagaStateMachineInstance , ISagaVersion { public Guid CorrelationId { get ; set ; } public string CurrentState { get ; set ; } public DateTime ? MassTransit-Kafka-Demo. As shown above, an event is a message that can be consumed by the state machine. The saga state machine must be configured to use that property. RabbitMQ (opens new window) MassTransit fully integrates with ASP. In this sample, I want the user to be able to see a history of Batches that were ran and the status of the jobs it processed. Dec 16, 2020 · This project is just for my learning. The _IServiceBus_ property is set before any methods on the saga instance are called, allowing it to be used by the event handlers defined in the saga. Nov 30, 2024 · The Saga pattern with MassTransit provides a robust solution for managing distributed business processes. In the example above, saga instances are stored in a collection named order. Following the example above, the initialization could be changed to use variables for the OrderId and OrderDate. In the example above, the CurrentState property on the saga state machine instance is used to store the instance's current state. Manage Distributed Transactions with Sagas : Dive into the Saga pattern to handle long-running transactions across multiple microservices. It is common that a service may need to combine database writes with publishing events and/or sending commands. Entity Framework is a commonly used ORM used with SQL. This promotes fairness in how messages are delivered, particularly in customer- or tenant-based applications to avoid an individual customer or tenant from blocking others due to high message volume. Shows how to use the Particular Platform to manage MassTransit faults. ck. Saga concurrency issues happen, particularly when using optimistic concurrency. NET Core 6. Aug 12, 2023 · MassTransit and Saga. The UseMessageScope or UseMessageLifetimeScope filters create the scope before the InMemoryOutbox, which is then used by the consumer or saga and any scoped filters (consume, publish There is a good set of examples opentelemetry-dotnet how it can be used for different cases. The MassTransit Test Harness is a framework for extending your existing IOC registrations with a testable bus instance. In order to support this, MassTransit needs the Manage permissions to support this development model. Fault<MassTransitFaultExample. I wanted to see if anyone was able to use an int to correlate events and messages in Masstransit. This sample was created along with Season 2 of the Twitch/YouTube video series. Okay, maybe that's a bit dramatic, but the point is, exceptions are a fact of software development. Below is a very simplified diagram of what I'm trying to move away from: So in the above example: Microservice 1 Handler is invoked; RPC call to Microservice A ->returns success; RPC call to Microservice B -> returns success The example above uses the in-memory saga repository, but any saga repository could be used. Jul 8, 2024 · These services will communicate via Azure Service Bus using MassTransit, and each will use Entity Framework Core for data access, with PostgreSQL for the Order service and SQL Server for the A state machine saga is defined, including event correlation and saga instance storag Episode Four introduces sagas, including Automatonymous state machines. The message flow for a saga May 20, 2024 · Библиотека MassTransit имеет возможность организовать и управлять серий событий. Utilize MassTransit: Explore MassTransit as a powerful tool for simplifying message handling and service orchestration, including configuring endpoints, consumers, and middleware. Jan 29, 2020 · This sample has multiple console applications, and a web API, allowing registrations to be submitted. Saga Guidance. The Sample allows RabbitMq or AzureSb to be used. For a more detailed example of configuring the job saga state machine endpoints, including persistent storage, see the sample mentioned in the box above. But now my saga instance class is an EF bound model and so I would therefore need to add another column to the database and refresh the model etc. The CorrelationId is the Guid assigned to the saga when it is created. NET Core. It cannot be used to communicate between multiple processes (even if they are on the same machine). In a distributed system, this can increase the latency of an application since the service may be hosted in another process, on another machine, or may even be a remote service in another network. And that makes it automatic. This support is included so that it is easy to move Aug 28, 2022 · New to Masstransit here and I wanted to correlate my message with an int value (let's call it OrderId of type INT. MassTransit supports several dependency injection containers. Bu makale içeriğinde ise geliştiriyor olduğumuz microservice ve messaging yapılarında, long-running business process işlemlerinde consistency’i MassTransit Saga State Machine implementasyonu ile nasıl sağlarız ve nasıl bir model workflow’u oluştururuz gibi konulara, araştırmalarım sırasında edinebildiğim bilgiler This sample shows how to configure and use MassTransit's new transactional outbox, including: An API controller that uses a domain registration service to register a member for an event. public class SubscriptionStateMachine : MassTransitStateMachine<SubscriptionStateInstance> { public SubscriptionSta Time is important, particularly in distributed applications. Mar 28, 2013 · MassTransit Courier is a great way to compose dynamic processing steps into a routing slip that can be executed, monitored, and compensated in the event of a fault. MassTransit supports two different methods of message scheduling: Scheduler-based, using either Quartz. The sample is explored in detail in my YouTube series. I will use the same order management example from Masstransit). In the end the Saga is finalized. A video introducing the templates is available on YouTube. There is a good set of examples opentelemetry-dotnet how it can be used for different cases. Requirements. MassTransit includes several dotnet new templates to create MassTransit project and components. Nov 25, 2021 · I'm after some guidance as to how best to use all the available MassTransit components to build out my Saga. This approach is highly recommended when using MassTransit. Get the source code for this video for FREE → https://the-dotnet-weekly. This sample was created along with the Twitch/YouTube video series. In this case, PostgreSQL is the database engine. EntityFrameworkCore NuGet packages. The SQL transport support message-level partition keys and messages can be consumed by partition key. I will invite you in any case to check the official… The example above uses the in-memory saga repository, but any saga repository could be used. For example, if an OrderNumber property was added to the OrderState class, it could be indexed by configuring it in the repository. So, from your example, this is entirely legal and will save the Acknowledged state to the repository. There are several types of storage that MassTransit supports, all of those, which are included to the main distribution, are listed MassTransit is an asynchronous framework that enables the development of high-performance and flexible distributed applications. The collection name can be specified using the CollectionName property. An event is something that happened which may result in a state change. NET that simplifies the development of message-based applications. View the sample: MassTransit Recoverability Showcase. paka vlsw hxdcn ajnsy qvc hoqpwn rfkvol dfjvu jexur sizzcm