get_dispatch: Get dispatch function

In eventr: Create Event Based Data Architectures

Description

This function returns the dispatch function of a dispatcher type object.

Usage

get_dispatch(obj)

Arguments

obj	An object of class dispatcher.

Value

This function returns a function with three parameters obj, events and accumulate. This function allows the user to evaluate a set of events.

Examples

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

eventr documentation built on July 8, 2020, 7:32 p.m.