NLP-Natural Language Processing ( Regular Expressions )

 What and Why

1) What is it

 - A language to specify the rules for the set of possible strings that you want to search in a corpus of text

"You password must have at least 8 characters, at least 1 upper case letter, at least 1 lowercase letter, at least 1 number and at lleast 1 symbol from the special symbols"

2) Why

- Why not using a pyhton program for seaching?

- Why not string functions?

- Can these find everything one wants?

Spring RSocket Validation / Error Handling

* RSocket treats app exceptions as an ApplicationErrorException(string message)

* Raising error signal will end response

* Prefer

    - defaultIfEmpty

    - switchIfEmpty

    - onErrorReturn

* Send exception/error details as Item response

* @MessageExceptionHandler 

Spring RSocket API Model

RSocket	Request : Response	Input Type	Output Tpye
Request & Response	1:1	Mono<T>	Mono<R>
Fire & Forget	1:0	Mono<T>	Mono<Void>
Request Stream	1:N	Mono<T>	Flux<R>
Request Channel	M:N	Flux<T>	Flux<R>

Routing

@MessageMapping("create.user")

public Mono<User> createUser(Mono<User> usermono){

    return this.userService.create(usermono);

}

@MessageMapping("update,user")

public Mono<User> updateUser(Mono<User> usermono){

    return this.userService.update(usermono);

}

RSocketRequester W/O Data

rSocketRequester.route("product.all")

                 //.data()

                 .retrieveFlux(Product.class);

RSocket Response - Streaming vs Single List

• Streaming T
• Size - Potentially large /unknown
• Pagination
• Uber driver location updates
• Online home-delivery update
• Receiving side might take too much time to process
• File upload
• More effcient than multiple Request & Response calls

• Single List<T>
• Size is small & Data already in hand!
• More efficient than streaming response

RSocket -> Peer-to-Peer

 

SocketAcceptor