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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 'monitor'
module Qpid
class Session < Invoker
def log; Qpid::logger["qpid.io.cmd"]; end
def msg; Qpid::logger["qpid.io.msg"]; end
class Exception < RuntimeError; end
class Closed < Qpid::Session::Exception; end
class Detached < Qpid::Session::Exception; end
INCOMPLETE = Object.new
def self.client(*args)
return Qpid::Client(*args)
end
def self.server(*args)
return Server(*args)
end
attr_reader :name, :spec, :auto_sync, :timeout, :channel
attr_reader :results, :exceptions
attr_accessor :channel, :auto_sync, :send_id, :receiver, :sender
# FIXME: Pass delegate through a block ?
def initialize(name, spec, kwargs = {})
auto_sync = true
auto_sync = kwargs[:auto_sync] if kwargs.key?(:auto_sync)
timeout = kwargs[:timeout] || 10
delegate = kwargs[:delegate]
@name = name
@spec = spec
@auto_sync = auto_sync
@timeout = timeout
@invoke_lock = Monitor.new
@closing = false
@closed = false
@cond_lock = Monitor.new
@condition = @cond_lock.new_cond
@send_id = true
@receiver = Receiver.new(self)
@sender = Sender.new(self)
@lock = Monitor.new
@incoming = {}
@results = {}
@exceptions = []
@assembly = nil
@delegate = delegate.call(self) if delegate
@ctl_seg = spec[:segment_type].enum[:control].value
@cmd_seg = spec[:segment_type].enum[:command].value
@hdr_seg = spec[:segment_type].enum[:header].value
@body_seg = spec[:segment_type].enum[:body].value
end
def incoming(destination)
@lock.synchronize do
queue = @incoming[destination]
unless queue
queue = Incoming.new(self, destination)
@incoming[destination] = queue
end
return queue
end
end
def error?
@exceptions.size > 0
end
def sync(timeout=nil)
if channel && Thread.current == channel.connection.thread
raise Qpid::Session::Exception, "deadlock detected"
end
unless @auto_sync
execution_sync(:sync => true)
end
last = @sender.next_id - 1
@cond_lock.synchronize do
unless @condition.wait_for(timeout) {
@sender.completed.include?(last) || error?
}
raise Qpid::Timeout
end
end
if error?
raise Qpid::Session::Exception, @exceptions
end
end
def close(timeout=nil)
@invoke_lock.synchronize do
@closing = true
channel.session_detach(name)
end
@cond_lock.synchronize do
unless @condition.wait_for(timeout) { @closed }
raise Qpid::Timeout
end
end
end
def closed
@lock.synchronize do
return if @closed
@results.each { |id, f| f.error(exceptions) }
@results.clear
@incoming.values.each { |q| q.close(exceptions) }
@closed = true
@cond_lock.synchronize { @condition.signal }
end
end
def resolve_method(name)
o = @spec.children[name]
case o
when Qpid::Spec010::Command
return invocation(:method, o)
when Qpid::Spec010::Struct
return invocation(:method, o)
when Qpid::Spec010::Domain
return invocation(:value, o.enum) unless o.enum.nil?
end
matches = @spec.children.select { |x|
x.name.to_s.include?(name.to_s)
}.collect { |x| x.name.to_s }.sort
if matches.size == 0
msg = nil
elsif matches.size == 1
msg = "Did you mean #{matches[0]} ? "
else
msg = "Did you mean one of #{matches.join(",")} ? "
end
return invocation(:error, msg)
end
def invoke(type, args)
# XXX
unless type.respond_to?(:track)
return type.create(*args)
end
@invoke_lock.synchronize do
return do_invoke(type, args)
end
end
def do_invoke(type, args)
raise Qpid::Session::Closed if @closing
raise Qpid::Session::Detached unless channel
# Clumsy simulation of Python's keyword args
kwargs = {}
if args.size > 0 && args[-1].is_a?(Hash)
if args.size > type.fields.size
kwargs = args.pop
elsif type.fields[args.size - 1].type != @spec[:map]
kwargs = args.pop
end
end
if type.payload
if args.size == type.fields.size + 1
message = args.pop
else
message = kwargs.delete(:message) # XXX Really ?
end
else
message = nil
end
hdr = Qpid::struct(@spec[:header])
hdr.sync = @auto_sync || kwargs.delete(:sync)
cmd = type.create(*args.push(kwargs))
sc = Qpid::StringCodec.new(@spec)
sc.write_command(hdr, cmd)
seg = Segment.new(true, (message.nil? ||
(message.headers.nil? && message.body.nil?)),
type.segment_type, type.track, @channel.id, sc.encoded)
unless type.result.nil?
result = Future.new(exception=Exception)
@results[@sender.next_id] = result
end
emit(seg)
log.debug("SENT %s %s %s" % [seg.id, hdr, cmd]) if log
unless message.nil?
unless message.headers.nil?
sc = Qpid::StringCodec.new(@spec)
message.headers.each { |st| sc.write_struct32(st) }
seg = Segment.new(false, message.body.nil?, @hdr_seg,
type.track, @channel.id, sc.encoded)
emit(seg)
end
unless message.body.nil?
seg = Segment.new(false, true, @body_seg, type.track,
@channel.id, message.body)
emit(seg)
end
msg.debug("SENT %s" % message) if msg
end
if !type.result.nil?
return @auto_sync ? result.get(@timeout) : result
elsif @auto_sync
sync(@timeout)
end
end
def received(seg)
@receiver.received(seg)
if seg.first_segment?
raise Qpid::Session::Exception unless @assembly.nil?
@assembly = []
end
@assembly << seg
if seg.last_segment?
dispatch(@assembly)
@assembly = nil
end
end
def dispatch(assembly)
hdr = nil
cmd = nil
header = nil
body = nil
assembly.each do |seg|
d = seg.decode(@spec)
case seg.type
when @cmd_seg
hdr, cmd = d
when @hdr_seg
header = d
when @body_seg
body = d
else
raise Qpid::Session::Exception
end
end
log.debug("RECV %s %s %s" % [cmd.id, hdr, cmd]) if log
if cmd.st_type.payload
result = @delegate.send(cmd.st_type.name, cmd, header, body)
else
result = @delegate.send(cmd.st_type.name, cmd)
end
unless cmd.st_type.result.nil?
execution_result(cmd.id, result)
end
if result != INCOMPLETE
assembly.each do |seg|
@receiver.has_completed(seg)
# XXX: don't forget to obey sync for manual completion as well
if hdr.sync
@channel.session_completed(@receiver.completed)
end
end
end
end
# Python calls this 'send', but that has a special meaning
# in Ruby, so we call it 'emit'
def emit(seg)
@sender.emit(seg)
end
def signal
@cond_lock.synchronize { @condition.signal }
end
def wait_for(timeout = nil, &block)
@cond_lock.synchronize { @condition.wait_for(timeout, &block) }
end
def to_s
"<Session: #{name}, #{channel}>"
end
class Receiver
attr_reader :completed
attr_accessor :next_id, :next_offset
def initialize(session)
@session = session
@next_id = nil
@next_offset = nil
@completed = Qpid::RangedSet.new()
end
def received(seg)
if @next_id.nil? || @next_offset.nil?
raise Exception, "todo"
end
seg.id = @next_id
seg.offset = @next_offset
if seg.last_segment?
@next_id += 1
@next_offset = 0
else
@next_offset += seg.payload.size
end
end
def has_completed(seg)
if seg.id.nil?
raise ArgumentError, "cannot complete unidentified segment"
end
if seg.last_segment?
@completed.add(seg.id)
end
end
def known_completed(commands)
completed = Qpid::RangedSet.new()
@completed.ranges.each do |c|
unless commands.ranges.find { |kc|
kc.contains(c.lower) && kc.contains(c.upper)
}
completed.add_range(c)
end
end
@completed = completed
end
end
class Sender
def initialize(session)
@session = session
@next_id = 0.to_serial
@next_offset = 0
@segments = []
@completed = RangedSet.new()
end
attr_reader :next_id, :completed
def emit(seg)
seg.id = @next_id
seg.offset = @next_offset
if seg.last_segment?
@next_id += 1
@next_offset = 0
else
@next_offset += seg.payload.size
end
@segments << seg
if @session.send_id
@session.send_id = false
@session.channel.session_command_point(seg.id, seg.offset)
end
@session.channel.connection.write_segment(seg)
end
def has_completed(commands)
@segments = @segments.reject { |seg| commands.include?(seg.id) }
commands.ranges.each do |range|
@completed.add(range.lower, range.upper)
end
end
end
class Incoming < Qpid::Queue
def initialize(session, destination)
super()
@session = session
@destination = destination
end
def start
@session.message_credit_unit.choices.each do |unit|
@session.message_flow(@destination, unit.value, 0xFFFFFFFF)
end
end
def stop
@session.message_cancel(@destination)
listen # Kill the listener
end
end
class Delegate
def initialize(session)
@session = session
end
#XXX: do something with incoming accepts
def message_accept(ma) nil; end
def execution_result(er)
future = @session.results.delete(er.command_id)
future.set(er.value)
end
def execution_exception(ex)
@session.exceptions << ex
end
end
class Client < Delegate
def log ; Qpid::logger["qpid.io.msg"]; end
def message_transfer(cmd, headers, body)
m = Qpid::Message.new(body)
m.headers = headers
m.id = cmd.id
messages = @session.incoming(cmd.destination)
messages.put(m)
log.debug("RECV %s" % m) if log
return INCOMPLETE
end
end
end
end
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