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require "cases/helper"
module ActiveRecord
module ConnectionAdapters
class ConnectionPoolTest < ActiveRecord::TestCase
def setup
# Keep a duplicate pool so we do not bother others
@pool = ConnectionPool.new ActiveRecord::Base.connection_pool.spec
end
def test_pool_caches_columns
columns = @pool.columns['posts']
assert_equal columns, @pool.columns['posts']
end
def test_pool_caches_columns_hash
columns_hash = @pool.columns_hash['posts']
assert_equal columns_hash, @pool.columns_hash['posts']
end
def test_clearing_cache
@pool.columns['posts']
@pool.columns_hash['posts']
@pool.primary_keys['posts']
@pool.clear_cache!
assert_equal 0, @pool.columns.size
assert_equal 0, @pool.columns_hash.size
assert_equal 0, @pool.primary_keys.size
end
def test_primary_key
assert_equal 'id', @pool.primary_keys['posts']
end
def test_primary_key_for_non_existent_table
assert_equal 'id', @pool.primary_keys['omgponies']
end
def test_primary_key_is_set_on_columns
posts_columns = @pool.columns_hash['posts']
assert posts_columns['id'].primary
(posts_columns.keys - ['id']).each do |key|
assert !posts_columns[key].primary
end
end
def test_clear_stale_cached_connections!
pool = ConnectionPool.new ActiveRecord::Base.connection_pool.spec
threads = [
Thread.new { pool.connection },
Thread.new { pool.connection }]
threads.map { |t| t.join }
pool.extend Module.new {
attr_accessor :checkins
def checkin conn
@checkins << conn
conn.object_id
end
}
pool.checkins = []
cleared_threads = pool.clear_stale_cached_connections!
assert((cleared_threads - threads.map { |x| x.object_id }).empty?,
"threads should have been removed")
assert_equal pool.checkins.length, threads.length
end
def test_checkout_behaviour
pool = ConnectionPool.new ActiveRecord::Base.connection_pool.spec
connection = pool.connection
assert_not_nil connection
threads = []
4.times do |i|
threads << Thread.new(i) do |pool_count|
connection = pool.connection
assert_not_nil connection
end
end
threads.each {|t| t.join}
Thread.new do
threads.each do |t|
thread_ids = pool.instance_variable_get(:@reserved_connections).keys
assert thread_ids.include?(t.object_id)
end
pool.connection
threads.each do |t|
thread_ids = pool.instance_variable_get(:@reserved_connections).keys
assert !thread_ids.include?(t.object_id)
end
end.join()
end
end
end
end
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