public class MessageCollector<T1, T2, T3, T4> : MessageCollector<T1, T2, T3> where T1 : Message where T2 : Message where T3 : Message where T4 : Message

Type Parameters

Name	Description
T1
T2
T3
T4

Remarks

The collector collects messages until all message types are collected. Afterwards it executes an action with the collected MessageCollection. In the following different scenarios are described, which explain the different aspects of this class.

Overriding messages

Assuming the message of type T1 was collected and T2 was not. When another message of type T1 is collected it replaces the old T1 message with the new message. No action is executed.

Considering message domains

Assuming the following MessageDomains and the collected messages:

 ---------------         ------------
| DefaultDomain | ----> | SubDomain1 |
 ---------------  |      ------------
T1 Message1       |      T1 Message2
                  |      T2 Message4
                  |
                  |      ------------
                  ----> | SubDomain2 |
                         ------------
                         T2 Message3
                         T2 Message5

Here is what happens in this scenario. Message1 is collected. Message2 is collected. This does not override Message1 because it is from a different MessageDomain. It is stored parallel. Message3 is collected. Now SubDomain2 has a complete set of Message1 + Message3. Message 4 is collected. Now there is another completed set in SubDomain1 of Message2 + Message4. Message5 is collected. This overrides Message3 as it is in the same MessageDomain. A new set is executed with Message1 + Message5. In the end the following sets were executed inorder:

Message1 + Message3
Message2 + Message4
Message1 + Message5

Consumed vs not consumed messages

Messages can be consumed during execution with the method MarkAsConsumed(Message). The consumed message is removed from the message collector immediately. Looking at the example above the Message1 is used twice. Assuming during the first execution of Message1 + Message3 the agent executed collection.MarkAsConsumed(Message1). In this case the third execution Message1 + Message5 would not have happened, as Message1 would have been cleared from the collector instance.

Constructors

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MessageCollector(Action<MessageCollection<T1, T2, T3, T4>>)

Declaration

public MessageCollector(Action<MessageCollection<T1, T2, T3, T4>> onMessagesCollected = null)

Parameters

Type	Name	Description
Action<MessageCollection<T1, T2, T3, T4>>	onMessagesCollected

Properties

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Messages4

Store for messages of type T4.

Declaration

protected ConcurrentDictionary<MessageDomain, MessageStore<T4>> Messages4 { get; }

Property Value

Type	Description
ConcurrentDictionary<MessageDomain, MessageStore<T4>>

Methods

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Aggregate(Message, Boolean)

Overridden by inheriting classes to try to add the message to the collector dictionaries.

Declaration

protected override bool Aggregate(Message message, bool throwError)

Parameters

Type	Name	Description
Message	message	The message to add
Boolean	throwError	If set to `true`, throws an error if the message could not be added.

Returns

Type	Description
Boolean	`true` if the message was added to any dictionary; otherwise `false`.

Overrides

Agents.Net.MessageCollector<T1, T2, T3>.Aggregate(Agents.Net.Message, System.Boolean)

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Execute(MessageCollection)

Overridden by inheriting classes to execute the typeless message collection cast to the specific collector type..

Declaration

protected override void Execute(MessageCollection messageCollection)

Parameters

Type	Name	Description
MessageCollection	messageCollection	The typeless collection.

Overrides

Agents.Net.MessageCollector<T1, T2, T3>.Execute(Agents.Net.MessageCollection)

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IsCompleted(MessageDomain, out MessageCollection)

Overridden by inheriting classes to see if there is a completed set for the specified domain.

Declaration

protected override bool IsCompleted(MessageDomain domain, out MessageCollection messageCollection)

Parameters

Type	Name	Description
MessageDomain	domain	The domain which should be completed.
MessageCollection	messageCollection	The message collection with the complete set.

Returns

Type	Description
Boolean	`true` if there is a completed set; otherwise `false`

Overrides

Agents.Net.MessageCollector<T1, T2, T3>.IsCompleted(Agents.Net.MessageDomain, Agents.Net.MessageCollection)

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PushAndContinue(Message, Action<MessageCollection<T1, T2, T3, T4>>, CancellationToken)

Add a message to the collector and continue with the specified action once when the set is found.

Declaration

public void PushAndContinue(Message message, Action<MessageCollection<T1, T2, T3, T4>> onCollected, CancellationToken cancellationToken = null)

Parameters

Type	Name	Description
Message	message	The message which is added to the collector.
Action<MessageCollection<T1, T2, T3, T4>>	onCollected	The action which is executed when the complete set is found.
CancellationToken	cancellationToken	Cancellation token to stop the continue operation.

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PushAndExecute(Message, Action<MessageCollection<T1, T2, T3, T4>>, CancellationToken)

Add a message to the collector and wait of the complete set to execute the specified action.

Declaration

public bool PushAndExecute(Message message, Action<MessageCollection<T1, T2, T3, T4>> onCollected, CancellationToken cancellationToken = null)

Parameters

Type	Name	Description
Message	message	The message which is added to the collector.
Action<MessageCollection<T1, T2, T3, T4>>	onCollected	The action which is executed when the complete set is found.
CancellationToken	cancellationToken	Cancellation token to stop the wait operation.

Returns

Type	Description
Boolean	`true` if the action was executed; otherwise `false`.

Remarks

This method is helpful for InterceptorAgents where the agent in the InterceptCore(Message) method must wait for a set of message before returning the InterceptionAction.

Another example is when the InterceptorAgent wants to wait on a single message. In this case the first message is the message that is intercepted. The second message is the message the agent needs. The advantage is, that the collector respects message domains.

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RemoveMessage(Message)

Overriden by inheriting classes to remove the message passed to the method.

Declaration

protected override void RemoveMessage(Message message)

Parameters

Type	Name	Description
Message	message	The message to remove from the collector.

Overrides

Agents.Net.MessageCollector<T1, T2, T3>.RemoveMessage(Agents.Net.Message)