Test on JRuby

[paneq]

Add JRuby into .travis.yml matrix.

See:

• https://docs.travis-ci.com/user/languages/ruby/
• https://github.com/rvm/rvm/issues/4297#issuecomment-397908042

[paneq]

Related #419

[paneq]

• [x] aggregate_root passes locally

[paneq]

• [x] bounded_context passes locally

[paneq]

• [ ] ruby_event_store

Works except for everything related to protobuf as the gem can't be compiled. We would need to disable loading these things on Jruby

rspec ./spec/mappers/protobuf_spec.rb:7 # RubyEventStore::Proto equality
rspec ./spec/mappers/protobuf_spec.rb:141 # RubyEventStore::Proto type
rspec ./spec/mappers/protobuf_spec.rb:77 # RubyEventStore::Proto equality - event_id must be the same
rspec ./spec/mappers/protobuf_spec.rb:52 # RubyEventStore::Proto equality - class must be the same
rspec ./spec/mappers/protobuf_spec.rb:101 # RubyEventStore::Proto equality - data must be the same
rspec ./spec/mappers/protobuf_spec.rb:125 # RubyEventStore::Proto yaml serialization
rspec ./spec/mappers/protobuf_spec.rb:31 # RubyEventStore::Proto equality - metadata does not need to be the same
rspec ./spec/mappers/protobuf_spec.rb:207 # RubyEventStore::Mappers::Protobuf #event_to_serialized_record returns proto serialized record
rspec ./spec/mappers/protobuf_spec.rb:216 # RubyEventStore::Mappers::Protobuf #serialized_record_to_event returns event instance
rspec ./spec/mappers/protobuf_spec.rb:225 # RubyEventStore::Mappers::Protobuf #serialized_record_to_event is using events class remapping
rspec ./spec/client_spec.rb:796 # RubyEventStore::Client can load serialized event using Protobuf mapper
rspec ./spec/client_spec.rb:319 # RubyEventStore::Client can handle protobuf event class instead of RubyEventStore::Event
rspec ./spec/link_by_metadata_spec.rb:31 # RubyEventStore::LinkByMetadata links to stream based on selected metadata (proto)

[paneq]

• [ ] rails_event_store_active_record

Almost passed with:

platform(:mri) do
  gem 'sqlite3', '1.3.13'
  gem 'pg', '0.21'
  gem 'mysql2', '0.4.10'
end

platform(:jruby) do
  gem 'activerecord-jdbcmysql-adapter', '51.1'
  gem 'activerecord-jdbcpostgresql-adapter', '51.1'
end

and protobuf disabled and Rails 5.1.6:

env "DATABASE_URL=postgresql://localhost/rails_event_store_active_record?pool=5" RAILS_VERSION=5.1.6 bundle exec rspec

so we could probably make it work.

errors:

  1) RailsEventStoreActiveRecord can be used without rails
     Failure/Error: process.start
     
     NameError:
       no constructor for arguments (org.jruby.ext.pathname.RubyPathname) on Java::JavaIo::File
         available overloads:
           (java.lang.String)
           (java.net.URI)
     # ./spec/without_rails_spec.rb:35:in `block in (root)'
     # ./spec/without_rails_spec.rb:16:in `block in (root)'
     # ./spec/support/mutant_timeout.rb:5:in `block in /Users/rupert/develop/rails_event_store/rails_event_store_active_record/spec/support/mutant_timeout.rb'

  2) RailsEventStoreActiveRecord::PgLinearizedEventRepository linearized by lock
     Failure/Error: exchanger.exchange!('unlocked', timeout)
     
     Concurrent::TimeoutError:
       Concurrent::TimeoutError
     # ./spec/pg_linearized_event_repository_spec.rb:39:in `block in RailsEventStoreActiveRecord'
     # ./spec/pg_linearized_event_repository_spec.rb:36:in `block in RailsEventStoreActiveRecord'

Finished in 52.31 seconds (files took 3.17 seconds to load)
147 examples, 2 failures, 3 pending

Failed examples:

rspec ./spec/without_rails_spec.rb:22 # RailsEventStoreActiveRecord can be used without rails
rspec ./spec/pg_linearized_event_repository_spec.rb:31 # RailsEventStoreActiveRecord::PgLinearizedEventRepository linearized by lock

[paneq]

• [ ] rails_event_store-rspec passes locally

[mostlyobvious]

At the moment JRuby is compatible with Ruby 2.6, which we have dropped from supported matrix. I'd like to focus more on truffleruby which seems to have brighter future.