From f09f774813043aa1abc696c4fc21a49928334978 Mon Sep 17 00:00:00 2001
From: "Rafael H. Schloming" <rhs@apache.org>
Date: Fri, 23 May 2008 20:22:13 +0000
Subject: QPID-947: Switched over to using proper RFC 1982 serial numbers.

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@659647 13f79535-47bb-0310-9956-ffa450edef68
---
 python/qpid/codec010.py  |  6 +++---
 python/qpid/datatypes.py | 47 ++++++++++++++++++++++++++++++++++++++++++++---
 python/qpid/session.py   |  4 ++--
 3 files changed, 49 insertions(+), 8 deletions(-)

(limited to 'python/qpid')

diff --git a/python/qpid/codec010.py b/python/qpid/codec010.py
index 68573921d7..3d67d42d43 100644
--- a/python/qpid/codec010.py
+++ b/python/qpid/codec010.py
@@ -18,7 +18,7 @@
 #
 
 from packer import Packer
-from datatypes import RangedSet, Struct
+from datatypes import serial, RangedSet, Struct
 
 class CodecException(Exception): pass
 
@@ -87,9 +87,9 @@ class Codec(Packer):
     self.pack("!f", f)
 
   def read_sequence_no(self):
-    return self.read_uint32()
+    return serial(self.read_uint32())
   def write_sequence_no(self, n):
-    self.write_uint32(n)
+    self.write_uint32(n.value)
 
 
   def read_uint64(self):
diff --git a/python/qpid/datatypes.py b/python/qpid/datatypes.py
index 7bea1ccc19..7249d5621b 100644
--- a/python/qpid/datatypes.py
+++ b/python/qpid/datatypes.py
@@ -116,14 +116,55 @@ class Message:
       args.append("id=%s" % self.id)
     return "Message(%s)" % ", ".join(args)
 
+def serial(o):
+  if isinstance(o, Serial):
+    return o
+  else:
+    return Serial(o)
+
+class Serial:
+
+  def __init__(self, value):
+    self.value = value & 0xFFFFFFFF
+
+  def __hash__(self):
+    return hash(self.value)
+
+  def __cmp__(self, other):
+    if other is None:
+      return 1
+
+    other = serial(other)
+
+    delta = (self.value - other.value) & 0xFFFFFFFF
+    neg = delta & 0x80000000
+    mag = delta & 0x7FFFFFFF
+
+    if neg:
+      return -mag
+    else:
+      return mag
+
+  def __add__(self, other):
+    return Serial(self.value + other)
+
+  def __sub__(self, other):
+    return Serial(self.value - other)
+
+  def __repr__(self):
+    return "serial(%s)" % self.value
+
+  def __str__(self):
+    return str(self.value)
+
 class Range:
 
   def __init__(self, lower, upper = None):
-    self.lower = lower
+    self.lower = serial(lower)
     if upper is None:
-      self.upper = lower
+      self.upper = self.lower
     else:
-      self.upper = upper
+      self.upper = serial(upper)
 
   def __contains__(self, n):
     return self.lower <= n and n <= self.upper
diff --git a/python/qpid/session.py b/python/qpid/session.py
index 1b33a4a795..3d8c0aa7fd 100644
--- a/python/qpid/session.py
+++ b/python/qpid/session.py
@@ -23,7 +23,7 @@ from datatypes import RangedSet, Struct, Future
 from codec010 import StringCodec
 from assembler import Segment
 from queue import Queue
-from datatypes import Message
+from datatypes import Message, serial
 from util import wait, notify
 from exceptions import *
 from logging import getLogger
@@ -304,7 +304,7 @@ class Sender:
 
   def __init__(self, session):
     self.session = session
-    self.next_id = 0
+    self.next_id = serial(0)
     self.next_offset = 0
     self.segments = []
     self._completed = RangedSet()
-- 
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