bf4

require './lib/adsjdbc-10.10.0.28.jar'
java_import java.sql.Driver
java_import java.sql.DriverManager
java_import 'com.extendedsystems.jdbc.advantage.ADSDriver'

class AdsAdapter

  def initialize(connect_string)
    @connect_string = connect_string
  end

bf4

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "description": "JSON:API Schema",
  "type": "object",
  "properties": {
    "link": { "$ref": "file://schemata/link.json#" },
    "meta": { "$ref": "file://schemata/meta.json#" }
  }
}

bf4

A collection of Linux commands and concepts I tend to forget

bf4

Step 0. Install Docker

Step 1. For your chosen project, decide where you want to store your notebooks and files in a workingfolder.

Step 2. Open that folder in the terminal cd workingfolder

Step 3. Run this command

docker run -it --rm -v $PWD:/home/jovyan/work -p 8888:8888 jupyter/all-spark-notebook

bf4

What

A technique for writing parsers.

Why

• Easy to understand
• Generally applicable
• Full power of the programming language at your disposal
• Declarative

bf4

Table of contents

• Concepts
• Reads
  • Basic Setup
  • Filtering
  • Custom Filtering
  • Sorting
  • Custom Sorting

bf4

module AMS
  module V09
    class Serializer < ActiveModel::Serializer

       def serializable_hash(adapter_options = nil,
                             options = {},
                             adapter_instance = self.class.serialization_adapter_instance)
         object.nil? ? nil : super
       end
    end

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  # Finds and yields relations in batches. Adapted from record.find_in_batches since that yields
  # arrays and we want to operate on relationships.
  # Adapted from:
  #   https://github.com/rails/rails/blob/4-2-stable/activerecord/lib/active_record/relation/batches.rb#L98-L115
  def find_in_batches(target, batch_size: default_batch_size, start: nil)
    relation = target
    if logger && (target.arel.orders.present? || target.arel.taken.present?)
      logger.warn("Scoped order and limit are ignored, it's forced to be batch order and batch size")
    end
    relation = relation.reorder(target.send(:batch_order)).limit(batch_size)

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Setup

• http://leiningen.org/ Get the repl
• Set up your ide (vim + fireplace, maybe atom, or be awesome with emacs. I don't use emacs)

Dip your beak

• https://learnxinyminutes.com/docs/clojure/ write this out in the repl to see what the code looks like.

The APIs are thorough and awesome

• https://clojure.org/about/rationale read this all the way through

bf4

/**
NOTE:
Assumes env contains aws credentials:
AWS_ACCESS_KEY_ID or AWS_ACCESS_KEY
AWS_SECRET_KEY_ID or AWS_SECRET_KEY
and AWS_REGION_NAME (e.g. 'US-EAST-1')

see EnvAuth() below
*/