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# Licensed to Elasticsearch B.V. under one or more contributor
# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch B.V. licenses this file to you under
# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
require 'spec_helper'
describe Elasticsearch::Transport::Transport::Connections::Selector do
before do
class BackupStrategySelector
include Elasticsearch::Transport::Transport::Connections::Selector::Base
def select(options={})
connections.reject do |c|
c.host[:attributes] && c.host[:attributes][:backup]
end.sample
end
end
end
after do
Object.send(:remove_const, :BackupStrategySelector)
end
let(:backup_strategy_selector) do
BackupStrategySelector.new
end
describe 'the Random selector' do
let(:connections) do
[1, 2]
end
let(:selector) do
described_class::Random.new(connections: connections)
end
it 'is initialized with connections' do
expect(selector.connections).to eq(connections)
end
describe '#select' do
let(:connections) do
(0..19).to_a
end
it 'returns a connection' do
expect(selector.select).to be_a(Integer)
end
context 'when multiple threads are used' do
it 'allows threads to select connections in parallel' do
expect(10.times.collect do
threads = []
20.times do
threads << Thread.new do
selector.select
end
end
threads.map { |t| t.join }
selector.select
end).to all(be_a(Integer))
end
end
end
end
describe 'the RoundRobin selector' do
let(:connections) do
['A', 'B', 'C']
end
let(:selector) do
described_class::RoundRobin.new(connections: connections)
end
it 'is initialized with connections' do
expect(selector.connections).to eq(connections)
end
describe '#select' do
it 'rotates over the connections' do
expect(selector.select).to eq('A')
expect(selector.select).to eq('B')
expect(selector.select).to eq('C')
expect(selector.select).to eq('A')
end
context 'when multiple threads are used' do
let(:connections) do
(0..19).to_a
end
it 'returns a connection' do
expect(selector.select).to be_a(Integer)
end
it 'allows threads to select connections in parallel' do
expect(10.times.collect do
threads = []
20.times do
threads << Thread.new do
selector.select
end
end
threads.map { |t| t.join }
selector.select
end).to eq((0..9).to_a)
end
end
end
end
describe 'a custom selector' do
let(:connections) do
[ double(host: { hostname: 'host1' }),
double(host: { hostname: 'host2', attributes: { backup: true } }) ]
end
let(:selector) do
BackupStrategySelector.new(connections: connections)
end
it 'is initialized with connections' do
expect(selector.connections).to eq(connections)
end
describe '#select' do
it 'applies the custom strategy' do
10.times { expect(selector.select.host[:hostname]).to eq('host1') }
end
end
end
context 'when the Base module is included in a class' do
before do
class ExampleSelector
include Elasticsearch::Transport::Transport::Connections::Selector::Base
end
end
after do
Object.send(:remove_const, :ExampleSelector)
end
it 'requires the #select method to be redefined' do
expect {
ExampleSelector.new.select
}.to raise_exception(NoMethodError)
end
end
end
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