Scott Bellware sbellware

Some useful Postgres configuration changes for a dev machine:

log_connections = on
log_disconnections = on
log_statement = 'all'

Optionally, set log timestamps to local time

log_timezone = 'US/Central' # Or whatever your timezone is

	12 Fallacies of Distributed Computing

	1. The network is reliable (Bill Joy, Tom Lyon)
	2. Latency isn't a problem (Bill Joy, Tom Lyon)
	3. Bandwidth isn't a problem (Bill Joy, Tom Lyon)
	4. The network is secure (Bill Joy, Tom Lyon)
	5. The topology won't change (Peter Deutsch)
	6. The administrator will know what to do (Peter Deutsch)
	7. Transport cost isn't a problem (Peter Deutsch)
	8. The network is homogeneous (James Gosling)

	class SomeClass
	def some_method
	end
	end

	C = Class.new(SomeClass)

	m = C.instance_method(:some_method)

	pp m.owner

	GEM
	remote: https://rubygems.org/
	specs:
	confstruct (1.0.2)
	hashie (~> 3.3)
	eventide-postgres (1.0.0.0)
	evt-consumer-postgres
	evt-entity_snapshot-postgres
	evt-entity_store
	evt-async_invocation (1.0.0.0)

	class Consumer
	include Consumer::Postgres

	handler SomeHandler
	handler SomeOtherHandler

	def error_raised(error, message_data)
	if error.instance_of?(MessageStore::ExpectedVersion::Error)
	self.(message_data)
	else

	handle Deposit do \|deposit\|
	account_id = deposit.account_id
	sequence = deposit.metadata.global_position

	# Retry once if an expected version error is raised by the write
	Retry.(MessageStore::ExpectedVersion::Error) do
	account, version = store.fetch(account_id, include: :version)

	# Idempotence protection using sequence numbers
	unless sequence > account.sequence

	handle SomeMessage do \|some_message\|
	post_data = PostData.build(some_message)

	Retry.(HTTPError, millisecond_intervals: [100, 200]) do
	SomeHttpAPI.post(post_data)
	end
	end

	class Consumer

	# ...

	def error_raised(error, message_data)
	# Do something with the error
	raise error
	end
	end

	ComponentHost.start(component_name) do \|host\|

	# ...

	host.record_error(error) do
	SomeErrorReporter.(error)
	end
	end

	module Events
	class Opened
	include Messaging::Message

	attribute :account_id, String
	attribute :customer_id, String
	attribute :time, String
	end

	class Deposited