paneq

Books

• Reactive Microservices Architecture: free report by Lightbend CTO Jonas Bonér
• DDD Distilled
• Designing Data-Intensive Applications
• Domain-Driven Design: Tackling Complexity in the Heart of Software
• Implementing DDD
• CQRS Documents by Greg Young

Presentations

paneq

class MyCommandHandler
  def initialize
    make_threadsafe_by_stateless
  end

  def call(cmd)
    local_var = cmd.something
    output(local_var)
  end

paneq

require 'pry'
require 'parser'
require 'parser/current'

class ConstToMethodRewriter < ::Parser::Rewriter
  def on_casgn(node)
    _, const_name, *args = node.children
    replace_range = node.location.expression
    const_value = args.first.location.expression.source

paneq

~/d/project (feature/delayed_job_pool|✚3…) $ cat tmp/pids/delayed_job.0.pid 
14702
~/d/project (feature/delayed_job_pool|✚3…) $ cat tmp/pids/delayed_job.1.pid 
14704
~/d/project (feature/delayed_job_pool|✚3…) $ ps aux | grep delayed
rupert           14702  72.9  2.9  4865820 481384   ??  R     9:43AM   3:25.55 delayed_job.0    
rupert           14704   0.0  2.8  4839192 467044   ??  S     9:43AM   3:26.31 delayed_job.1    
rupert           15205   0.0  0.0  4267752    360 s005  R+   10:18AM   0:00.00 grep --color=auto delayed

~/d/project (feature/delayed_job_pool|✚3…) $ kill -9 14702

paneq

require 'action_view'
require 'tmpdir'
require 'fileutils'
require 'optparse'

def check_syntax(path, options = {})
  erb = content(path)
  code = ruby_code(erb)
  eval("BEGIN { puts('ok'); return true }; #{code}", nil, path, 0)

paneq

# sudo gem install bson
# sudo gem install bson_ext
# sudo gem install yajl-ruby
# sudo gem install json
# sudo gem install msgpack

require 'rubygems'
require 'benchmark'
require 'yaml'
require 'bson'

paneq

mysql> EXPLAIN SELECT  `my_table_name_xxxxxxxxxxxxx`.* FROM `my_table_name_xxxxxxxxxxxxx`  WHERE `my_table_name_xxxxxxxxxxxxx`.`order_id` = 2015522 LIMIT 1;
+----+-------------+-----------------------------+------+-----------------------------------------------+------+---------+------+--------+-------------+
| id | select_type | table                       | type | possible_keys                                 | key  | key_len | ref  | rows   | Extra       |
+----+-------------+-----------------------------+------+-----------------------------------------------+------+---------+------+--------+-------------+
|  1 | SIMPLE      | my_table_name_xxxxxxxxxxxxx | ALL  | index_my_table_name_xxxxxxxxxxxxx_on_order_id | NULL | NULL    | NULL | 280511 | Using where |
+----+-------------+-----------------------------+------+-----------------------------------------------+------+---------+------+--------+-------------+
1 row in set (0.00 sec)

mysql> EXPLAIN SELECT  `my_table_name_xxxxxxxxxxxxx`.* FROM `my_table_name_xx

paneq

client = Elasticsearch::Client.new host: 'localhost:9200', logger: Rails.logger

client.indices.create({
  index: "businesses",
  body: {
    settings: {},
     mappings: {
       "business" => {
         properties:{
           name:          {:type=>"string",  index: "not_analyzed"}, # you probably need different index type depending on what kind of queries there are

paneq

# keep in one file
class Whatever
  class A
    def self.interface_method
    end
  end

  class B
    def self.interface_method
    end

paneq

==> p: Last 10 log lines:
==> p: compiling object_tracing.c
==> p: compiling objspace.c
==> p: linking shared-object objspace.so
==> p: make[2]: Leaving directory `/tmp/ruby-build.20141225212618.1716/ruby-2.2.0/ext/objspace'
==> p: linking shared-object date_core.so
==> p: make[2]: Leaving directory `/tmp/ruby-build.20141225212618.1716/ruby-2.2.0/ext/date'
==> p: linking shared-object nkf.so
==> p: make[2]: Leaving directory `/tmp/ruby-build.20141225212618.1716/ruby-2.2.0/ext/nkf'
==> p: make[1]: Leaving directory `/tmp/ruby-build.20141225212618.1716/ruby-2.2.0'