Module dk.cloudcreate.essentials.reactive

Package dk.cloudcreate.essentials.reactive.command.interceptor

Interface CommandBusInterceptorChain

All Known Implementing Classes:

CommandBusInterceptorChain.DefaultCommandBusInterceptorChain

public interface CommandBusInterceptorChain

Generic interceptor chain concept that supports intercepting LocalCommandBus operations

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	CommandBusInterceptorChain.DefaultCommandBusInterceptorChain	Default implementation for the CommandBusInterceptorChain.

Method Summary

Modifier and Type	Method	Description
Object	command()	The command associated with the interceptor chain
CommandHandler	matchedCommandHandler()	The single CommandHandler the responded true to CommandHandler.canHandle(Class)
static CommandBusInterceptorChain	newInterceptorChain(Object command, CommandHandler matchedCommandHandler, List<CommandBusInterceptor> interceptors, BiFunction<CommandBusInterceptor,CommandBusInterceptorChain,Object> interceptorOperationInvoker, Function<Object,Object> defaultCommandBusBehaviour)	Create a new CommandBusInterceptorChain instance for the handling of a Command
Object	proceed()	To continue the processing a CommandBusInterceptor will call this method, which in turn will call other CommandBusInterceptor's (if more interceptors are configured) and finally the LocalCommandBus's default implementation will be called. If the CommandBusInterceptor can provide a result without calling the default LocalCommandBus behaviour then it can just return its (e.g.

Method Detail

proceed

Object proceed()

To continue the processing a CommandBusInterceptor will call this method, which in turn will call other CommandBusInterceptor's (if more interceptors are configured) and finally the LocalCommandBus's default implementation will be called.
If the CommandBusInterceptor can provide a result without calling the default LocalCommandBus behaviour then it can just return its (e.g. cached) result and not call proceed()

Returns:

the result of the operation

command

Object command()

The command associated with the interceptor chain

Returns:

The command associated with the interceptor chain

matchedCommandHandler

CommandHandler matchedCommandHandler()

The single CommandHandler the responded true to CommandHandler.canHandle(Class)

Returns:

the matched command handler

newInterceptorChain

static CommandBusInterceptorChain newInterceptorChain(Object command,
                                                      CommandHandler matchedCommandHandler,
                                                      List<CommandBusInterceptor> interceptors,
                                                      BiFunction<CommandBusInterceptor,CommandBusInterceptorChain,Object> interceptorOperationInvoker,
                                                      Function<Object,Object> defaultCommandBusBehaviour)

Create a new CommandBusInterceptorChain instance for the handling of a Command

Parameters:

command - the command instance

matchedCommandHandler - the single CommandHandler the responded true to CommandHandler.canHandle(Class)

interceptors - the CommandBusInterceptor's (can be an empty List if no interceptors have been configured)

interceptorOperationInvoker - the function responsible for calling the correct CommandBusInterceptor send method

defaultCommandBusBehaviour - the function invoking the default LocalCommandBus send method logic

Returns:

a new CommandBusInterceptorChain instance