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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF 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 'logger'
require 'thread'
module Thrift
# this class expects to always use a FramedTransport for reading messages
class NonblockingServer < BaseServer
def initialize(processor, server_transport, transport_factory=nil, protocol_factory=nil, num=20, logger=nil)
super(processor, server_transport, transport_factory, protocol_factory)
@num_threads = num
if logger.nil?
@logger = Logger.new(STDERR)
@logger.level = Logger::WARN
else
@logger = logger
end
@shutdown_semaphore = Mutex.new
@transport_semaphore = Mutex.new
end
def serve
@logger.info "Starting #{self}"
@server_transport.listen
@io_manager = start_io_manager
begin
loop do
break if @server_transport.closed?
rd, = select([@server_transport], nil, nil, 0.1)
next if rd.nil?
socket = @server_transport.accept
@logger.debug "Accepted socket: #{socket.inspect}"
@io_manager.add_connection socket
end
rescue IOError => e
end
# we must be shutting down
@logger.info "#{self} is shutting down, goodbye"
ensure
@transport_semaphore.synchronize do
@server_transport.close
end
@io_manager.ensure_closed unless @io_manager.nil?
end
def shutdown(timeout = 0, block = true)
@shutdown_semaphore.synchronize do
return if @is_shutdown
@is_shutdown = true
end
# nonblocking is intended for calling from within a Handler
# but we can't change the order of operations here, so lets thread
shutdown_proc = lambda do
@io_manager.shutdown(timeout)
@transport_semaphore.synchronize do
@server_transport.close # this will break the accept loop
end
end
if block
shutdown_proc.call
else
Thread.new &shutdown_proc
end
end
private
def start_io_manager
iom = IOManager.new(@processor, @server_transport, @transport_factory, @protocol_factory, @num_threads, @logger)
iom.spawn
iom
end
class IOManager # :nodoc:
DEFAULT_BUFFER = 2**20
def initialize(processor, server_transport, transport_factory, protocol_factory, num, logger)
@processor = processor
@server_transport = server_transport
@transport_factory = transport_factory
@protocol_factory = protocol_factory
@num_threads = num
@logger = logger
@connections = []
@buffers = Hash.new { |h,k| h[k] = '' }
@signal_queue = Queue.new
@signal_pipes = IO.pipe
@signal_pipes[1].sync = true
@worker_queue = Queue.new
@shutdown_queue = Queue.new
end
def add_connection(socket)
signal [:connection, socket]
end
def spawn
@iom_thread = Thread.new do
@logger.debug "Starting #{self}"
run
end
end
def shutdown(timeout = 0)
@logger.debug "#{self} is shutting down workers"
@worker_queue.clear
@num_threads.times { @worker_queue.push [:shutdown] }
signal [:shutdown, timeout]
@shutdown_queue.pop
@signal_pipes[0].close
@signal_pipes[1].close
@logger.debug "#{self} is shutting down, goodbye"
end
def ensure_closed
kill_worker_threads if @worker_threads
@iom_thread.kill
end
private
def run
spin_worker_threads
loop do
rd, = select([@signal_pipes[0], *@connections])
if rd.delete @signal_pipes[0]
break if read_signals == :shutdown
end
rd.each do |fd|
if fd.handle.eof?
remove_connection fd
else
read_connection fd
end
end
end
join_worker_threads(@shutdown_timeout)
ensure
@shutdown_queue.push :shutdown
end
def read_connection(fd)
@buffers[fd] << fd.read(DEFAULT_BUFFER)
frame = slice_frame!(@buffers[fd])
if frame
@logger.debug "#{self} is processing a frame"
@worker_queue.push [:frame, fd, frame]
end
end
def spin_worker_threads
@logger.debug "#{self} is spinning up worker threads"
@worker_threads = []
@num_threads.times do
@worker_threads << spin_thread
end
end
def spin_thread
Worker.new(@processor, @transport_factory, @protocol_factory, @logger, @worker_queue).spawn
end
def signal(msg)
@signal_queue << msg
@signal_pipes[1].write " "
end
def read_signals
# clear the signal pipe
# note that since read_nonblock is broken in jruby,
# we can only read up to a set number of signals at once
sigstr = @signal_pipes[0].readpartial(1024)
# now read the signals
begin
sigstr.length.times do
signal, obj = @signal_queue.pop(true)
case signal
when :connection
@connections << obj
when :shutdown
@shutdown_timeout = obj
return :shutdown
end
end
rescue ThreadError
# out of signals
# note that in a perfect world this would never happen, since we're
# only reading the number of signals pushed on the pipe, but given the lack
# of locks, in theory we could clear the pipe/queue while a new signal is being
# placed on the pipe, at which point our next read_signals would hit this error
end
end
def remove_connection(fd)
# don't explicitly close it, a thread may still be writing to it
@connections.delete fd
@buffers.delete fd
end
def join_worker_threads(shutdown_timeout)
start = Time.now
@worker_threads.each do |t|
if shutdown_timeout > 0
timeout = (start + shutdown_timeout) - Time.now
break if timeout <= 0
t.join(timeout)
else
t.join
end
end
kill_worker_threads
end
def kill_worker_threads
@worker_threads.each do |t|
t.kill if t.status
end
@worker_threads.clear
end
def slice_frame!(buf)
if buf.length >= 4
size = buf.unpack('N').first
if buf.length >= size + 4
buf.slice!(0, size + 4)
else
nil
end
else
nil
end
end
class Worker # :nodoc:
def initialize(processor, transport_factory, protocol_factory, logger, queue)
@processor = processor
@transport_factory = transport_factory
@protocol_factory = protocol_factory
@logger = logger
@queue = queue
end
def spawn
Thread.new do
@logger.debug "#{self} is spawning"
run
end
end
private
def run
loop do
cmd, *args = @queue.pop
case cmd
when :shutdown
@logger.debug "#{self} is shutting down, goodbye"
break
when :frame
fd, frame = args
begin
otrans = @transport_factory.get_transport(fd)
oprot = @protocol_factory.get_protocol(otrans)
membuf = MemoryBufferTransport.new(frame)
itrans = @transport_factory.get_transport(membuf)
iprot = @protocol_factory.get_protocol(itrans)
@processor.process(iprot, oprot)
rescue => e
@logger.error "#{Thread.current.inspect} raised error: #{e.inspect}\n#{e.backtrace.join("\n")}"
end
end
end
end
end
end
end
end
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