org.axonframework.axonserver.connector.command

Class AxonServerCommandBus.Builder

java.lang.Object

org.axonframework.axonserver.connector.command.AxonServerCommandBus.Builder

Enclosing class:

AxonServerCommandBus

public static class AxonServerCommandBus.Builder
extends Object

Builder class to instantiate an AxonServerCommandBus.

The CommandPriorityCalculator is defaulted to CommandPriorityCalculator#defaultCommandPriorityCalculator(), and the {@link TargetContextResolver} defaults to a lambda returning the {@link AxonServerConfiguration#getContext()} as the context. The {@link ExecutorServiceBuilder} defaults to {@link ExecutorServiceBuilder#defaultCommandExecutorServiceBuilder()}. The {@link CommandBusSpanFactory} defaults to a {@link DefaultCommandBusSpanFactory} backed by a {@link NoOpSpanFactory}. The {@link AxonServerConnectionManager}, the {@link AxonServerConfiguration}, the local {@link CommandBus}, {@link Serializer} and the {@link RoutingStrategy} are hard requirements and as such should be provided.

Constructor Summary

Constructors

Constructor and Description
Builder()

Method Summary

Modifier and Type	Method and Description
AxonServerCommandBus.Builder	axonServerConnectionManager(AxonServerConnectionManager axonServerConnectionManager) Sets the AxonServerConnectionManager used to create connections between this application and an Axon Server instance.
AxonServerCommandBus	build() Initializes a AxonServerCommandBus as specified through this Builder.
protected CommandSerializer	buildSerializer() Build a CommandSerializer using the configured serializer and configuration.
AxonServerCommandBus.Builder	configuration(AxonServerConfiguration configuration) Sets the AxonServerConfiguration used to configure several components within the Axon Server Command Bus, like setting the client id or the number of command handling threads used.
AxonServerCommandBus.Builder	defaultCommandCallback(CommandCallback<Object,Object> defaultCommandCallback) Sets the callback to use when commands are dispatched in a "fire and forget" method, such as AxonServerCommandBus.dispatch(CommandMessage).
AxonServerCommandBus.Builder	defaultContext(String defaultContext) Sets the default context for this command bus to connect to.
AxonServerCommandBus.Builder	executorServiceBuilder(ExecutorServiceBuilder executorServiceBuilder) Sets the ExecutorServiceBuilder which builds an ExecutorService based on a given AxonServerConfiguration and BlockingQueue of Runnable.
AxonServerCommandBus.Builder	loadFactorProvider(CommandLoadFactorProvider loadFactorProvider) Sets the CommandLoadFactorProvider which provides the load factor values for all commands this client can handle.
AxonServerCommandBus.Builder	localSegment(CommandBus localSegment) Sets the local CommandBus used to dispatch incoming commands to the local environment.
AxonServerCommandBus.Builder	priorityCalculator(CommandPriorityCalculator priorityCalculator) Sets the CommandPriorityCalculator used to deduce the priority of an incoming command among other commands, to give precedence over high(er) valued queries for example.
AxonServerCommandBus.Builder	routingStrategy(RoutingStrategy routingStrategy) Sets the RoutingStrategy used to correctly configure connections between Axon clients and Axon Server.
AxonServerCommandBus.Builder	serializer(Serializer serializer) Sets the Serializer used to de-/serialize incoming and outgoing commands and command results.
AxonServerCommandBus.Builder	spanFactory(CommandBusSpanFactory spanFactory) Sets the CommandBusSpanFactory implementation to use for providing tracing capabilities.
AxonServerCommandBus.Builder	spanFactory(SpanFactory spanFactory) Deprecated. Use spanFactory(CommandBusSpanFactory) instead as it provides more configurability.
AxonServerCommandBus.Builder	targetContextResolver(TargetContextResolver<? super CommandMessage<?>> targetContextResolver) Sets the TargetContextResolver used to resolve the target (bounded) context of an ingested CommandMessage.
protected void	validate() Validates whether the fields contained in this Builder are set accordingly.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Builder

public Builder()

Method Detail

axonServerConnectionManager

public AxonServerCommandBus.Builder axonServerConnectionManager(AxonServerConnectionManager axonServerConnectionManager)

Sets the AxonServerConnectionManager used to create connections between this application and an Axon Server instance.

Parameters:

axonServerConnectionManager - an AxonServerConnectionManager used to create connections between this application and an Axon Server instance

Returns:

the current Builder instance, for fluent interfacing

configuration

public AxonServerCommandBus.Builder configuration(AxonServerConfiguration configuration)

Sets the AxonServerConfiguration used to configure several components within the Axon Server Command Bus, like setting the client id or the number of command handling threads used.

Parameters:

configuration - an AxonServerConfiguration used to configure several components within the Axon Server Command Bus

Returns:

the current Builder instance, for fluent interfacing

localSegment

public AxonServerCommandBus.Builder localSegment(CommandBus localSegment)

Sets the local CommandBus used to dispatch incoming commands to the local environment.

Parameters:

localSegment - a CommandBus used to dispatch incoming commands to the local environment

Returns:

the current Builder instance, for fluent interfacing

serializer

public AxonServerCommandBus.Builder serializer(Serializer serializer)

Sets the Serializer used to de-/serialize incoming and outgoing commands and command results.

Parameters:

serializer - a Serializer used to de-/serialize incoming and outgoing commands and command results

Returns:

the current Builder instance, for fluent interfacing

routingStrategy

public AxonServerCommandBus.Builder routingStrategy(RoutingStrategy routingStrategy)

Sets the RoutingStrategy used to correctly configure connections between Axon clients and Axon Server.

Parameters:

routingStrategy - a RoutingStrategy

Returns:

the current Builder instance, for fluent interfacing

defaultCommandCallback

public AxonServerCommandBus.Builder defaultCommandCallback(CommandCallback<Object,Object> defaultCommandCallback)

Sets the callback to use when commands are dispatched in a "fire and forget" method, such as AxonServerCommandBus.dispatch(CommandMessage). Defaults to a NoOpCallback. Passing null will result in a NoOpCallback being used.

Parameters:

defaultCommandCallback - the callback to invoke when no explicit callback is provided for a command

Returns:

the current Builder instance, for fluent interfacing

priorityCalculator

public AxonServerCommandBus.Builder priorityCalculator(CommandPriorityCalculator priorityCalculator)

Sets the CommandPriorityCalculator used to deduce the priority of an incoming command among other commands, to give precedence over high(er) valued queries for example. Defaults to a CommandPriorityCalculator.defaultCommandPriorityCalculator().

Parameters:

priorityCalculator - a CommandPriorityCalculator used to deduce the priority of an incoming command among other commands

Returns:

the current Builder instance, for fluent interfacing

targetContextResolver

public AxonServerCommandBus.Builder targetContextResolver(TargetContextResolver<? super CommandMessage<?>> targetContextResolver)

Sets the TargetContextResolver used to resolve the target (bounded) context of an ingested CommandMessage. Defaults to returning the AxonServerConfiguration.getContext() on any type of command message being ingested.

Parameters:

targetContextResolver - a TargetContextResolver used to resolve the target (bounded) context of an ingested CommandMessage

Returns:

the current Builder instance, for fluent interfacing

executorServiceBuilder

public AxonServerCommandBus.Builder executorServiceBuilder(ExecutorServiceBuilder executorServiceBuilder)

Sets the ExecutorServiceBuilder which builds an ExecutorService based on a given AxonServerConfiguration and BlockingQueue of Runnable. This ExecutorService is used to process incoming commands with. Defaults to a ThreadPoolExecutor, using the AxonServerConfiguration.getCommandThreads() for the pool size, a keep-alive-time of 100ms, the given BlockingQueue as the work queue and an AxonThreadFactory.

Note that it is highly recommended to use the given BlockingQueue if you are to provide you own executorServiceBuilder, as it ensure the command's priority is taken into consideration. Defaults to ExecutorServiceBuilder.defaultCommandExecutorServiceBuilder().

Parameters:

executorServiceBuilder - an ExecutorServiceBuilder used to build an ExecutorService based on the AxonServerConfiguration and a BlockingQueue

Returns:

the current Builder instance, for fluent interfacing

loadFactorProvider

public AxonServerCommandBus.Builder loadFactorProvider(CommandLoadFactorProvider loadFactorProvider)

Sets the CommandLoadFactorProvider which provides the load factor values for all commands this client can handle. The load factor values are sent to AxonServer during command subscription. AxonServer uses these values to balance the dispatching of commands among the client instances. The default implementation of loadFactorProvider returns always CommandLoadFactorProvider.DEFAULT_VALUE

Parameters:

loadFactorProvider - a CommandLoadFactorProvider used to get the load factor value for each specific command that this client can handle

Returns:

the current Builder instance, for fluent interfacing

defaultContext

public AxonServerCommandBus.Builder defaultContext(String defaultContext)

Sets the default context for this command bus to connect to.

Parameters:

defaultContext - for this bus to connect to.

Returns:

the current Builder instance, for fluent interfacing

spanFactory

@Deprecated
public AxonServerCommandBus.Builder spanFactory(@Nonnull
                                                            SpanFactory spanFactory)

Deprecated. Use spanFactory(CommandBusSpanFactory) instead as it provides more configurability.

Sets the SpanFactory implementation to use for providing tracing capabilities. Defaults to a NoOpSpanFactory by default, which provides no tracing capabilities.

Parameters:

spanFactory - The SpanFactory implementation

Returns:

The current Builder instance, for fluent interfacing.

spanFactory

public AxonServerCommandBus.Builder spanFactory(@Nonnull
                                                CommandBusSpanFactory spanFactory)

Sets the CommandBusSpanFactory implementation to use for providing tracing capabilities. Defaults to a DefaultCommandBusSpanFactory backed by a NoOpSpanFactory by default, which provides no tracing capabilities.

Parameters:

spanFactory - The CommandBusSpanFactory implementation

Returns:

The current Builder instance, for fluent interfacing.

build

public AxonServerCommandBus build()

Initializes a AxonServerCommandBus as specified through this Builder.

Returns:

a AxonServerCommandBus as specified through this Builder

buildSerializer

protected CommandSerializer buildSerializer()

Build a CommandSerializer using the configured serializer and configuration.

Returns:

a CommandSerializer based on the configured serializer and configuration

validate

protected void validate()
                 throws AxonConfigurationException

Validates whether the fields contained in this Builder are set accordingly.

Throws:

AxonConfigurationException - if one field is asserted to be incorrect according to the Builder's specifications