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MessageBase

Base class providing a complete implementation of common message functionality.

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Syntax

public abstract class MessageBase : IMessage, IMetadataAware, ITrackable

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Inheritance

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Implements

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Constructors

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MessageBase

protected MessageBase()
Creates a new instance of the message with automatically generated ID and correlation ID.

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MessageBase

protected MessageBase(IMessage parent)
Creates a new instance of the message as a child of another message.

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Parameters

  • parent IMessage: The parent message to inherit metadata from.

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Exceptions

  • [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception): Thrown when parent is null.

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Properties

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CorrelationId

public Guid CorrelationId { get; set; }
Gets or sets the correlation ID for tracking related messages across the entire processing chain.

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Returns

Guid A that groups all messages belonging to the same business transaction or workflow. All related messages should share the same correlation ID regardless of their parent-child relationships.

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Id

public Guid Id { get; set; }
Gets or sets the unique identifier for this Message.

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Returns

Guid A that uniquely identifies this message instance. This value should be set when the message is created and remain constant throughout the message’s lifetime.

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Metadata

public ConcurrentDictionary<string, object> Metadata { get; set; }
Gets or sets the thread-safe metadata storage for passing data between handlers in the processing pipeline.

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Returns

ConcurrentDictionary<string, object> A where keys are string identifiers and values are objects containing the metadata. The dictionary must be thread-safe as it may be accessed concurrently.

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ParentId

public Guid? ParentId { get; set; }
Gets or sets the ID of the parent message that triggered this message, enabling message lineage tracking.

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Returns

Guid? A nullable that identifies the immediate parent message. This value should be null for root messages that start a new workflow, and set to the parent’s ID for derived or spawned messages.

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Remarks

MessageBase provides a convenient base class that implements all core message interfaces, making it easy to create new message types without having to implement the common functionality manually. It automatically handles ID generation, metadata initialization, tracking properties, and provides constructors for creating child messages with proper lineage tracking. This class is abstract and must be inherited to create concrete message types. It’s recommended to use this base class for most message implementations unless you have specific requirements that prevent inheritance.