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# File 'lib/querrel/map_reduce.rb', line 8
def map(scope, options = {}, &blk)
options = @options.merge(options)
if options.key?(:on)
resolver = ConnectionResolver.new(options[:on], !!options[:db_names])
dbs = resolver.configurations.keys
else
resolver = @connection_resolver
dbs = @connection_resolver.configurations.keys
end
query_model = scope.model
results = {}
results_semaphore = Mutex.new
pool = StaticPool.new(options[:threads] || 20)
dbs.each do |db|
pool.enqueue do
Thread.current[:querrel_connected_models] = []
con_spec = retrieve_connection_spec(db, resolver)
Thread.current[:querrel_con_spec] = con_spec
dynamic_class = ConnectedModelFactory[query_model, con_spec]
begin
local_scope = dynamic_class.all.merge(scope)
local_results = if block_given?
res = yield(local_scope, ConnectedModelFactory)
res.to_a.each(&:readonly!) if res.is_a?(ActiveRecord::Relation)
res
else
local_scope.to_a.map do |r|
query_model.instantiate(r.attributes, {}).tap(&:readonly!)
end
end
results_semaphore.synchronize { results[db] = local_results }
ensure
Thread.current[:querrel_connected_models].each do |m|
m.connection_pool.release_connection
end
Thread.current[:querrel_connected_models] = nil
end
end
end
pool.do_your_thang!
results
end
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