# File lib/rack/session/memcache.rb, line 48
48:       def get_session(env, session_id)
49:         @mutex.lock if env['rack.multithread']
50:         unless session_id and session = @pool.get(session_id)
51:           session_id, session = generate_sid, {}
52:           unless /^STORED/ =~ @pool.add(session_id, session)
53:             raise "Session collision on '#{session_id.inspect}'"
54:           end
55:         end
56:         session.instance_variable_set '@old', @pool.get(session_id, true)
57:         return [session_id, session]
58:       rescue MemCache::MemCacheError, Errno::ECONNREFUSED
59:         # MemCache server cannot be contacted
60:         warn "#{self} is unable to find memcached server."
61:         warn $!.inspect
62:         return [ nil, {} ]
63:       ensure
64:         @mutex.unlock if @mutex.locked?
65:       end