eventr (version 1.0.0)

dispatcher: Dispatcher

Description

Dispatcher Constructor.

Usage

dispatcher(handlers)
new_dispatcher(handlers)
validate_dispatcher(handlers)

Arguments

handlers

A list of handlers build using handler() function.

Value

The dispatcher() function retuns a dispatcher object. A dispatcher object contains two items: handlers and dispatch. handlers is a handlers_list object with all the handlers definitions. dispatch is a function with two params: obj and event. The dispatch() function allows the user to run a list of events using the handlers definitions.

Examples

# NOT RUN {
library(eventr)
library(dplyr)

birth_event <- event(
  id = 'first-id',
  type = 'BIRTH',
  time = '1936-11-09',
  birth_date = '1936-11-09'
)

death_event <- event(
  id = 'second-id',
  type = 'DEATH',
  time = '2019-05-22',
  death_date = '2019-05-22'
)

set_birth_date <- function(obj, event){
  obj$birth_date <- get_body_attr(event, "birth_date")
  return(obj)
}

set_death_date <- function(obj, event){
  obj$death_date <- get_body_attr(event, "death_date")
  return(obj)
}

birth_handler <- handler(type = 'BIRTH', FUN = set_birth_date)
death_handler <- handler(type = 'DEATH', FUN = set_death_date)

handlers <- handlers_list(birth_handler, death_handler)

the_dispatcher <- dispatcher(handlers)

dispatch <- get_dispatch(the_dispatcher)

events <- event_list(birth_event, death_event)

the_obj <- dispatch(events = events, accumulate = FALSE)
the_obj

the_obj <- dispatch(events = events, accumulate = TRUE)
the_obj

# transform the_obj to data.frame
the_obj %>%
  purrr::map(as.data.frame) %>%
  bind_rows

# }