Background literature on CORBAchrke55/courses/SWE/hand-corba.pdf · Callback reverses roles of...
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TDDC18 Component-based software. IDA, Linköpings universitet. Slides by courtesy of Uwe Assmann, IDA / TU Dresden. Revised by C. Kessler, 2005. CORBA Overview, Goals Basic mechanisms for modularity, exchangeability, adaptation, transparency CORBA Services and CORBA Facilities CORBA, Web and Java Evaluation of CORBA as a composition system [Szyperski, Chapter 13] 2 TDDC18 Component-based software. IDA, Linköpings universitet. Slides by courtesy of Uwe Assmann, IDA / TU Dresden. Revised by C. Kessler, 2005. Background literature on CORBA F. Bolton: Pure CORBA. Sams Publishing, 2002. R. Orfali, D. Harkey: Client/Server programming with Java and Corba, 2 nd edition, Wiley 1998. Easy to read. R. Orfali, D. Harkey, J. Edwards: Instant Corba. Addison-Wesley 1997. Special issue of Communications of the ACM 41(10), Oct. 1998. All articles. Overview of CORBA 3.0. Tanenbaum, van Steen: Distributed Systems. Pearson, 2003. Principles and paradigms. OMG: CORBA 2.2 and CORBA 3.0 Specification. http://www.omg.org See also further material from the OMG on the Web OMG: CORBAfacilities: Common Object Facilities Specifications. http://www.omg.org 3 TDDC18 Component-based software. IDA, Linköpings universitet. Slides by courtesy of Uwe Assmann, IDA / TU Dresden. Revised by C. Kessler, 2005. CORBA Common Object Request Broker Architecture® Founding year of the OMG (Object Management Group) 1989 Goal: plug-and-play components everywhere CORBA 1.1 1991 (IDL, ORB, BOA) ODMG-93 (Standard for OO-databases) CORBA 2.0 1995. Version 2 is a separate line, 2.2 and 2.4 are status quo CORBA 3.0 1999 (POA). Current version (2005) is 3.0.3. 4 TDDC18 Component-based software. IDA, Linköpings universitet. Slides by courtesy of Uwe Assmann, IDA / TU Dresden. Revised by C. Kessler, 2005. Ingredients of CORBA Component Model Components == classes and objects, i.e., similar to object-oriented software. Components have more component secrets Basic interoperability Language interoperability by uniform interfaces description Transparent distribution Transparent Network protocols CORBA Services CORBA Facilities Horizontal (general-purpose) vs. vertical (domain-specific) CORBA MOF
Transcript of Background literature on CORBAchrke55/courses/SWE/hand-corba.pdf · Callback reverses roles of...
TD
DC
18 C
ompo
nent
-bas
ed
softw
are.
IDA
, Lin
köpi
ngs
univ
ersi
tet.
Slid
es
by c
ourt
esy
of U
we
Ass
man
n, ID
A /
TU
Dre
sden
. R
evis
ed b
y C
. Kes
sler
, 200
5.
CO
RB
A
Ove
rvie
w, G
oals
B
asic
mec
han
ism
s fo
r m
odul
arity
, exc
hang
eabi
lity,
ad
apta
tion,
tran
spar
ency
CO
RB
A S
ervi
ces
and
CO
RB
A F
acili
ties
CO
RB
A, W
eb a
nd J
ava
Eva
luat
ion
of C
OR
BA
as
a co
mp
ositi
on s
yste
m
[Szy
pers
ki,
Ch
apte
r 13
]
2
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Bac
kgro
und
liter
atur
e on
CO
RB
A
�F
. Bol
ton:
Pur
e C
OR
BA
. Sam
s P
ublis
hing
, 200
2.�
R. O
rfal
i, D
. Har
key:
Clie
nt/S
erve
r pr
ogra
mm
ing
with
Jav
a an
d C
orba
, 2nd
edi
tion,
Wile
y 19
98. E
asy
to r
ead
.
�R
. Orf
ali,
D. H
arke
y, J
. Edw
ards
: Ins
tant
Cor
ba. A
ddis
on-W
esle
y 19
97.
�S
peci
al is
sue
of C
omm
unic
atio
ns o
f the
AC
M 4
1(10
), O
ct. 1
998.
A
ll ar
ticle
s. O
verv
iew
of C
OR
BA
3.0
.
�T
anen
baum
, van
Ste
en:
Dis
trib
uted
Sys
tem
s. P
ears
on, 2
003.
Prin
cipl
es a
nd
para
digm
s.
�O
MG
: CO
RB
A 2
.2 a
nd C
OR
BA
3.0
Spe
cific
atio
n.
http
://w
ww
.om
g.or
gS
ee a
lso
furt
her
ma
teri
al fr
om th
e O
MG
on
the
We
b
�O
MG
: CO
RB
Afa
cilit
ies:
Com
mon
Obj
ect F
acili
ties
Spe
cific
atio
ns.
http
://w
ww
.om
g.or
g
3
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
CO
RB
A
�C
omm
on O
bjec
t Req
uest
Bro
ker
Arc
hite
ctur
e®�
Fou
ndin
g ye
ar o
f the
OM
G (
Obj
ect M
anag
emen
t Gro
up)
1989
�G
oal:
plug
-and
-pla
y co
mpo
nent
s ev
eryw
here
�C
OR
BA
1.1
199
1 (
IDL,
OR
B, B
OA
)�
OD
MG
-93
(S
tand
ard
for
OO
-dat
abas
es)
�C
OR
BA
2.0
199
5.V
ersi
on 2
is a
sep
arat
e lin
e, 2
.2 a
nd 2
.4 a
re s
tatu
s qu
o�
CO
RB
A 3
.0 1
999
(P
OA
).C
urre
nt v
ersi
on (
2005
) is
3.0
.3.
4
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Ingr
edie
nts
of C
OR
BA
�C
om
po
nen
t M
od
el�
Com
pon
ents
==
cla
sse
s an
d ob
ject
s, i.
e., s
imila
r to
obj
ect-
orie
nted
so
ftwar
e. C
ompo
nen
ts h
ave
mor
e co
mpo
nen
t sec
rets
�B
asic
inte
rop
erab
ility
�La
ngu
age
inte
rope
rabi
lity
by u
nifo
rm in
terf
aces
des
crip
tion
�T
rans
pare
nt d
istr
ibu
tion
�T
rans
pare
nt N
etw
ork
pro
toco
ls
�C
OR
BA
Ser
vice
s
�C
OR
BA
Fac
iliti
es�
Hor
izon
tal (
gen
eral
-pur
pose
) v
s. v
ertic
al (
dom
ain-
spec
ific)
�C
OR
BA
MO
F
5
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
OM
A
(Obj
ect M
anag
emen
t Arc
hite
ctur
e)
Ob
ject
Re
ques
t B
roke
r
Obj
ect S
ervi
ces
(CO
RB
A S
erv
ices
)
App
licat
ion
Inte
rfac
es
Dom
ain
Inte
rfac
esC
omm
on F
acili
ties
(CO
RB
A F
acili
ties)
�A
so
ftw
are
bu
s
Tim
eS
ecu
rity
Lice
nsin
gP
rop
ertie
s..
.
Eve
nts
Life
cycl
eP
ers
iste
nce
Tra
nsa
ctio
ns
...
6
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Cor
ba’s
Hyd
roce
phal
us
�C
orb
a is
larg
e�
Obj
ect
Req
uest
Bro
ker
– 20
00 p
ages
of s
peci
ficat
ion
�O
bje
ct S
erv
ices
– 3
00
page
s�
Com
mon
Fac
ilitie
s –
150
pag
es�
Tec
hn
ical
rea
sons
�C
lean
det
aile
d so
lutio
n�
Som
etim
es
over
kill
�S
oci
olo
gic
reas
on
s�
OM
G is
larg
e (
over
800
par
tner
s) a
nd h
eter
ogen
eou
s�
Sta
ndar
d c
over
s a
wid
e ra
nge
�L
ing
uis
tic
reas
on
s�
Ow
n la
ngua
ge�
Lots
of u
nint
uiti
ve 3
-ca
pita
ls-n
ames
(O
MG
, OR
B,
IDL,
…)
�A
ppea
rs la
rger
than
nec
essa
ry
TD
DC
18 C
ompo
nent
-bas
ed
softw
are.
IDA
, Lin
köpi
ngs
univ
ersi
tet.
Slid
es
by c
ourt
esy
of U
we
Ass
man
n, ID
A /
TU
Dre
sden
. R
evis
ed b
y C
. Kes
sler
, 200
5.
Cor
bas
Mec
hani
sms
for
Com
posi
tion
(Bas
ic In
tero
pera
bilit
y)
8
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
CO
RB
A in
tero
pera
bilit
y m
echa
nism
s
Sou
rce:
http
://w
ww
.cs.
wus
tl.ed
u/~
schm
idt
9
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Lang
uage
Tra
nspa
renc
y
�In
terf
ace
defi
nit
ion
lan
gua
ge
– C
OR
BA
IDL
�C
OR
BA
Inte
rfa
ce D
efin
ition
Lan
guag
e de
scrib
es in
terf
aces
�F
rom
that
, glu
e co
de
is g
ener
ated
(g
lue
code
is c
ode
that
glu
es n
on-f
ittin
g co
mp
onen
ts to
geth
er)
�G
ene
rate
stu
b a
nd s
kele
tons
for
lang
uage
ada
ptat
ion
�P
ow
erfu
l typ
e s
yste
m�
Sta
ndar
dize
d (
ISO
147
50)
�L
angu
age
bin
din
gs f
or m
any
lan
gua
ges
�A
ntiq
ue: C
OB
OL
�C
lass
ic: C
�O
O: C
++
, Sm
allT
alk
, Eiff
el, J
ava
�S
crip
ting:
Pyt
hon
10
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Con
cept
s in
the
CO
RB
A
Inte
rfac
e D
efin
ition
Lan
guag
e (I
DL)
mo
du
le <
ide
ntifi
er>
{
<ty
pe d
ecl
ara
tions
>
<co
nsta
nt d
ecla
ratio
ns>
<
exce
ptio
n d
ecla
ratio
ns>
//
cla
sses
in
terf
ace
<id
en
tifie
r> :
<in
herit
ing
-fro
m>
{
<ty
pe
dec
lara
tion
s>
<co
nst
ant
de
clar
atio
ns>
<
exc
ept
ion
de
clar
atio
ns>
/
/ m
eth
ods
<
op
type
> <
iden
tifie
r>(<
para
met
ers
>)
{
.
..
}
...
.
}}
type
s
type
s
Ints
(sh
ort,.
.)
cons
truc
tors
basi
c ty
pes
non-
obje
cts
obje
cts
Rea
ls (
float
..)
Str
uct
Cha
r, s
trin
g,
Uni
on
Seq
uenc
e
Arr
ayoc
tet
Enu
m
Boo
l
AnyIO
R
valu
e ob
ject
s
11
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
IDL-
to-L
angu
age
Map
ping
�B
iject
ive
map
pin
g
from
Co
rba
IDL
typ
es t
o p
rog
ram
min
g la
ng
uage
typ
es�
Map
s b
asic
type
s d
irect
ly�
Map
s ty
pe c
onst
ruct
ors
�M
app
ing
mak
es t
ran
spar
ent
�B
yte
ord
er (
big-
end
ian
/ litt
le-e
ndia
n)�
Wor
d le
ngth
�M
emor
y la
yout
�R
efer
ence
s
�O
ne
stan
dar
d f
or
each
pro
gra
mm
ing
lan
gu
age!
12
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Hel
lo W
orld
in ID
L
#ifn
def
_H
EL
LOW
OR
LD
_ID
L#d
efin
e _
HE
LLO
WO
RL
D_
IDL
mo
du
le H
ello
Wo
rld {
in
terf
ace
Sim
ple
Hel
loW
orld
{
str
ing
sayH
ello
();
}
;}; #e
ndi
f
mo
du
le C
ou
nte
r {
//
unb
oun
ded
seq
uen
ce o
f lo
ngs:
ty
ped
ef s
eque
nce
<lo
ng>
one
Dim
Arr
ay;
//
sp
ecify
inte
rfac
e fo
r a
co
unte
r:
inte
rfac
e C
oun
t {
att
rib
ute
lon
g su
m;
// c
ou
nte
r
lo
ng
incr
em
ent(
);
v
oid
rea
dC
tr (
in o
neD
imA
rra
y X
,
in
int
posi
tion
k )
;
}}
hello
.idl
coun
t.id
l
14
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Inte
rope
rabl
e O
bjec
t Ref
eren
ce
(IO
R)
�A
n o
bjec
t re
fere
nce
pro
vid
es in
form
atio
n to
un
iqu
ely
spec
ify
an o
bje
ct w
ithi
n a
dis
trib
uted
OR
B s
yste
m
�U
niq
ue
nam
e o
r id
enti
fier
�L
ang
uag
e-tr
ansp
aren
t:M
appe
d to
clie
nt's
nor
mal
sou
rce
lang
uage
ref
eren
ces
(uni
que
map
ping
for
each
sup
port
ed la
ngua
ge)
�Im
ple
men
tati
on
in C
OR
BA
:O
bjec
t ref
eren
ce to
a s
erve
r ob
ject
is g
iven
out
by
the
serv
er's
OA
,sh
ippe
d to
clie
nts
as IO
R o
bjec
t and
sto
red
ther
e in
a p
roxy
obj
ect.
OR
B s
uppo
rts
strin
gific
atio
n / d
estr
ingi
ficat
ion
of IO
R's
.R
etrie
val o
f ref
eren
ces
by c
lient
: su
ppor
ted
by n
amin
g se
rvic
e A
ll re
fere
ncin
g go
es v
ia th
e se
rver
's O
RB
->
enab
les
dist
ribut
ed r
efer
ence
cou
ntin
g
15
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Inte
rope
rabl
e O
bjec
t Ref
eren
ce
(IO
R)
- co
nt.
�T
rans
ient
(ter
min
ates
with
ser
ver)
or
pers
iste
nt
�IO
R is
larg
er, m
ore
time-
cons
umin
g th
an la
ngua
ge-b
ound
ref
eren
ces
�C
onsi
sts
of:
�T
ype
nam
e (c
ode)
, i.e
. ind
ex in
to I
nter
face
Rep
osito
ry�
Pro
toco
l and
add
ress
info
rmat
ion
(e
.g. T
CP
/IP, p
ort #
, hos
t nam
e),
coul
d su
ppor
t mor
e th
an o
ne p
roto
col
�O
bje
ct k
ey:
�O
bje
ct a
dapt
er n
ame
(fo
r O
A)
�O
paq
ue d
ata
only
rea
dab
le b
y th
e g
ener
atin
g O
RB
(lo
cal r
efe
renc
e)
Typ
e N
ame:
inte
rfac
ere
posi
tory
re
fere
nce
Obj
ect
key
P
roto
col
Ad
dre
ssP
ort
Obj
ect
Ada
pte
r
Opa
que
un
ique
da
ta
IOR
16
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
IOR
Exa
mpl
e
IDL
:T
imeS
erv
er:
Ver
sio
n 1
.0
Obj
ect k
ey
IIO
Piio
p.m
y.ne
t12
34
OA
2
0x00
03
IOR
������
Co
rba
Ob
ject
0x0
001
OA
2
OA
1 (
BO
A/P
OA
)
�������
���������
���
�
Co
rba
Ob
ject
0x0
002
Co
rba
Ob
ject
0x00
03
17
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
The
Top
Cla
ss:
CO
RB
A::O
bjec
t
�T
he c
lass
CO
RB
A::O
bjec
t is
inhe
rited
to a
ll ob
ject
s
�T
here
by, C
OR
BA
sup
port
s re
flect
ion
and
intr
ospe
ctio
n
�R
efle
ctiv
e fu
nctio
ns:
�ge
t_in
terf
ace
deliv
ers
a re
fere
nce
to th
e en
try
in th
e in
terf
ace
repo
sito
ry
�ge
t_im
plem
enta
tion
a re
fere
nce
to th
e im
plem
enta
tion
�R
efle
ctio
n al
so b
y th
e In
terfa
ce
Rep
osito
ry (
list_
initi
al_r
efer
ence
s fr
om th
e C
OR
BA
::OR
B in
terf
ace)
.
CO
RB
A::
Obj
ect
get_
imp
lem
enta
tio
nge
t_in
terf
ace
is_n
ilis
_acr
eate
_req
ues
tdu
plic
ate
rele
ase
....
18
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Pro
blem
: M
ultip
le In
herit
ance
�C
OR
BA
::Obj
ect
incl
udes
cod
e in
to a
cla
ss�
Man
y la
ngua
ges
only
offe
r si
ngle
inhe
ritan
ce�
App
licat
ion
supe
rcla
ss m
ust b
e a
dele
gat
ee
CO
RB
A::O
bje
ct
Ap
plic
atio
nCla
ssth
at n
eed
s co
nne
ctio
n
Ap
plic
atio
nCla
ssS
up
erC
lass
CO
RB
A::O
bje
ct
Ap
plic
atio
nCla
ssth
at n
eed
s co
nne
ctio
n
Ap
plic
atio
nCla
ssS
up
erC
lass
TD
DC
18 C
ompo
nent
-bas
ed
softw
are.
IDA
, Lin
köpi
ngs
univ
ersi
tet.
Slid
es
by c
ourt
esy
of U
we
Ass
man
n, ID
A /
TU
Dre
sden
. R
evis
ed b
y C
. Kes
sler
, 200
5.
Bas
ic C
OR
BA
Con
nect
ions
20
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Bas
ic C
onne
ctio
ns in
CO
RB
A
�S
tati
c m
eth
od
cal
l with
sta
tic
stu
bs
and
skel
eto
ns�
Loca
l or
rem
ote
�P
olym
orp
hic
cal
l �
Loca
l or
rem
ote
�E
ven
t tr
ansm
issi
on
�C
allb
ack
�D
ynam
ic in
voca
tio
n (D
II, r
eque
st b
roki
ng)
�S
earc
hin
g se
rvic
es d
ynam
ical
ly in
the
web
(lo
catio
n tr
ansp
are
ncy
of a
ser
vice
)
�T
rad
ing
�F
ind
serv
ices
in a
ye
llow
pag
es s
ervi
ce, b
ase
d on
pro
pert
ies
21
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Sta
tic C
OR
BA
Cal
l
�A
dvan
tag
e: t
he
par
tici
pan
ts (
met
ho
ds)
are
sta
tical
ly k
no
wn
�C
all b
y st
ub a
nd s
kele
tons
, with
out
invo
lvem
ent
of a
n O
RB
�S
uppo
rts
dist
ribu
tion
: E
xcha
nge
of l
oca
l cal
l in
one
add
ress
sp
ace
to r
em
ote
call
is v
ery
eas
y:�
Inhe
rit f
rom
a C
OR
BA
cla
ss�
Writ
e an
IDL
spe
c�
No
sea
rch
for
serv
ice
obje
cts
->
rat
her
fast
�B
ette
r ty
pe
chec
k, s
ince
the
com
pile
r kn
ow
s th
e in
volv
ed ty
pes
�T
he
call
goes
th
rou
gh t
he
serv
er o
bje
ct a
dap
ter
�T
his
hid
es th
e de
tail
whe
ther
the
serv
er
is tr
ansi
ent o
r pe
rsis
tent
22
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Ser
ver
Sid
e
Obj
ect A
dapt
erID
LS
kele
ton
OR
B C
ore
Se
rve
r / O
bje
ct Im
plem
enta
tion
deac
tiva
te_
obj
deac
tiva
te_
impl
impl
_is
_re
ad
yob
ject
_is_
rea
dy
23
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
cre
ate
_PO
Acr
eat
e_l
ifesp
an
_pol
icy
activ
ate
_ob
ject
_w
ith_
id
the
_PO
AM
anag
er (
.act
ivat
e)
serv
ant
_to
_re
fere
nce
Bas
ic O
bjec
t Ada
pter
BO
A
�T
he B
OA
hid
es
�Li
fe ti
me
of th
e se
rver
obj
ect
(act
iva
tion:
sta
rt, s
top)
�P
ers
iste
ncy
�T
he B
OA
is im
plem
ente
d in
eve
ry
OR
B, f
or m
inim
al s
ervi
ce p
rovi
sion
�T
he B
OA
mai
ntai
ns th
e im
plem
enta
tion
repo
sito
ry
(com
pone
nt r
egis
try)
.
�It
supp
orts
non
-obj
ect-
orie
nted
cod
e
�In
CO
RB
A 3
.0 r
epla
ced
by P
OA
(Por
tabl
e O
bjec
t Ada
pter
)
CO
RB
A::
BO
A
crea
tege
t_id
disp
ose
set_
exce
pti
on
imp
l_is
_rea
dy
obj_
is_r
ead
ych
ang
e_im
ple
men
tati
on
deac
tiva
te_i
mp
lde
acti
vate
_ob
j
24
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect A
ctiv
atio
n on
the
Ser
ver
������
������
������
�� �������
init
get_
id
obj_
is_
rea
dy
obj_
is_
rea
dy
Imp
l_is
_re
ady
deac
tiva
te_
obj
deac
tiva
te_
obj
deac
tiva
te_
imp
l
Obj
ect a
dap
ter
Pro
cess
clie
nt
requ
ests
her
e...
cre
ate
25
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect A
dapt
ers
Sup
port
D
iffer
ent S
erve
r M
odel
s
�C
om
mo
n s
erve
r p
roce
ss�
Sev
era
l obj
ect
s re
side
in o
ne p
roce
ss o
n th
e se
rver
; th
e B
OA
initi
aliz
es th
em a
s th
read
s w
ith c
omm
on a
ddre
ss s
pac
e
(“co
mm
on a
ppar
tme
nt”)
�de
act
ivat
e_im
pl,
impl
_is_
read
y, o
bj_i
s_re
ady
ar
e m
appe
d d
irect
ly to
thre
ad f
unct
ion
s�
Sep
arat
e se
rver
pro
cess
es�
For
eve
ry o
bjec
t an
own
proc
ess
�S
erve
r-p
er-r
equ
est
�E
very
req
uest
gen
era
tes
a n
ew p
roce
ss
�P
ersi
sten
t se
rver
�H
ere
star
ts a
noth
er a
pplic
atio
n th
e ob
ject
s (e
.g.,
a da
ta b
ase
).
�T
he B
OA
pas
ses
on th
e qu
erie
s
26
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Cal
lbac
ks w
ith th
e C
allb
ack
Ser
vice
�C
allb
ack
fun
ctio
n r
egis
trat
ion
�P
roce
dur
e va
riab
le,
clos
ure
(pro
cedu
re v
aria
ble
with
arg
ume
nts)
or
ref
eren
ce to
an
obje
ct
�C
allb
ack
wor
ks
for
all l
angu
ages
�C
allb
ack
reve
rses
rol
es
of c
lient
and
ser
ver
Clie
nt
Se
rve
rC
lien
t2
reg
iste
rCal
lba
ck()
riseE
ven
t()
callC
allb
ack(
)
retu
rn()
sig
nal
()
27
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Eve
nts
�S
end
eve
nt
ob
ject
s fr
om
eve
nt
sup
plie
rs t
o e
ven
t co
nsu
mer
sun
idire
ctio
nal e
vent
cha
nnel
s de
coup
le s
uppl
ier
and
cons
umer
�E
vent
ob
ject
s (a
lso
calle
d m
essa
ges
) ar
e im
mu
tab
le o
nce
sen
t�
Asy
nchr
onou
s co
mm
unic
atio
n; o
rde
r of
eve
nts
is n
ot r
espe
cte
d�
No
retu
rn v
alue
s (e
xce
pt w
ith r
efer
ence
s to
col
lect
or o
bjec
ts)
�U
nic
ast:
one
rec
eive
r
�M
ult
icas
t: m
any
rece
iver
s
�D
ynam
ical
ly v
aryi
ng
rec
eive
rs(r
egis
ter
at c
hann
els
as s
uppl
ier
/ con
sum
er;
even
t typ
e fil
terin
g)
�W
ork
s fo
r ev
ery
CO
RB
A la
ngu
age
28
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
CO
RB
A E
vent
Ser
vice
�P
ush
mo
del:
S
uppl
ier
send
s ev
ent o
bjec
t by
calli
ng p
ush
oper
atio
n on
cha
nnel
,w
hich
cal
ls p
ush
to d
eliv
er e
vent
obj
ect t
o al
l reg
iste
red
cons
umer
s
�P
ull m
ode
l:C
onsu
mer
cal
ls p
ull o
pera
tion
on c
hann
el (
polli
ng fo
r ar
rivin
g ev
ents
)w
hich
trig
gers
cal
ls to
pul
l to
regi
ster
ed s
uppl
iers
�A
s in
term
edia
te in
stan
ces,
an
eve
nt
chan
nel
can
be
allo
cate
d�
The
y bu
ffer,
filte
r, a
nd m
ap
pull
to p
ush
�U
nty
ped
gen
eric
eve
nts
, or
typ
ed b
y ID
L
�A
dva
nta
ge:
�A
sync
hro
nous
wor
king
in th
e W
eb (
with
IIO
P a
nd d
ynam
ic C
all)
�A
ttach
men
t of
lega
cy s
yste
ms
inte
rest
ing
for
user
inte
rfac
es, n
etw
ork
co
mpu
ting
etc.
�D
isad
van
tage
: Ver
y ge
nera
l int
erfa
ce
29
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Dyn
amic
Cal
l (D
II, R
eque
st B
roki
ng)
�D
ynam
ic c
all
via
the
OR
B's
DII
(Dyn
amic
Invo
catio
n In
terf
ace)
�S
ervi
ces
can
be d
ynam
ical
ly e
xcha
nged
, or
bro
ugh
t int
o th
e pl
ay a
pos
terio
ri
�W
ithou
t rec
ompi
latio
n of
clie
nts
�S
low
er th
an s
tatic
invo
catio
ns
�R
equ
ires
intr
osp
ecti
on
�
Req
uir
es d
escr
ipti
ons
of s
eman
tics
of
serv
ice
com
po
nen
ts...
�F
or id
entif
icat
ion
of s
ervi
ces
�M
eta
data
(de
scrip
tive
data
):
cata
logs
of
com
pon
ents
(in
terf
ace
rep
osi
tory
, im
ple
m. r
epos
itory
)�
Nam
ing
serv
ice,
Tra
ding
ser
vice
, Pro
pert
y se
rvic
e (l
ater
)
�...
an
d a
med
iato
r th
at lo
oks
up
fo
r se
rvic
es:
the
OR
B30
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect R
eque
st B
roke
r O
RB
�F
or a
dyn
am
ic c
all,
the
OR
B m
ust b
e
invo
lved
�T
he O
RB
is a
med
iato
r (d
esig
n pa
ttern
) be
twee
n cl
ient
and
ser
ver.
�H
ides
the
the
env
iron
men
t fro
m c
lient
s
�C
an ta
lk to
oth
er
OR
Bs,
al
so o
n th
e w
eb
(IIO
P In
tern
et I
nter
-OR
B p
roto
col)
CO
RB
A::
OR
B
init
ob
ject
_to
_str
ing
stri
ng
_to
_ob
ject
crea
te_l
ist
crea
te_o
per
atio
n_l
ist
get
_def
ault
_co
nte
xtcr
eate
_en
viro
nm
ent
BO
A_i
nit
list_
init
ial_
serv
ices
reso
lve_
init
ial_
refe
ren
ces
....
31
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
OR
B A
ctiv
atio
n
������
������
�� ��
� �
� ������
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32
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Pro
toco
l Dyn
amic
Cal
l (D
II)
������
������
������
�������
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������
������
������������
� �
������� �
��������
���! ���
"���#�
������
$���
�! ���
arg
um
ent
s
33
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Exa
mpl
e 1:
Dyn
amic
Cal
l in
C++
Clie
nt p
rogr
am
��
��
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334
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Exa
mpl
e 2:
DII
Invo
catio
n in
Jav
a
Clie
nt p
rogr
am (1
)
''�
���
�B�
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�
''�
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��
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��
�
$�
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C��
B
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6E
EF
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�
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��
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%
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7$
%
,.���
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>�B�
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5
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B��
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>
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3
35
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
%''
����
�
��.
%
�
����
�&
��
B �
��2
��C�,
���
'�����
���
��
����
6B9
2 ���
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�
�
>��
>��$
�
3 �
���
����
B��
�B�
��
��
B�.���
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$%
,.���
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��
���
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$�,
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3 ''� �����! ����
���
B��
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B��
=>
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B�
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3 %''
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=>
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3
Exa
mpl
e 2:
DII
Invo
catio
n in
Jav
a C
lient
cod
e (2
)
36
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
publ
ic c
lass
Se
rve
r {
p
ublic
sta
tic v
oid
ma
in(
Str
ing[
] arg
s )
{
org
.om
g.C
OR
BA
.OR
B o
rb =
nul
l;
try
{
o
rb =
org
.om
g.C
OR
BA
.OR
B.in
it( a
rgs,
nul
l);
}
ca
tch
(o
rg.o
mg
.CO
RB
A.S
yste
mE
xcep
tion
se
) {
S
yste
m.e
rr.p
rintln
("O
RB
init
failu
re "
+ s
e);
S
yste
m.e
xit(
1);
}
o
rg.o
mg.
CO
RB
A.B
OA
bo
a =
nul
l;
try
{
bo
a =
orb
.BO
A_i
nit(
);
}
catc
h (
org
.om
g.C
OR
BA
.Sys
tem
Exc
eptio
n s
e)
{
Sys
tem
.err
.prin
tln("
BO
A in
it fa
ilure
" +
se)
;
Sys
tem
.exi
t(1)
;
}
S
hip
.Air
craf
tCa
rrie
r ca
rrie
r =
new
Airc
raft
Car
rierI
mp
l("N
imitz
");
try
{
boa
.obj
_is
_re
ady
(car
rier
);
} ca
tch
(org
.om
g.C
OR
BA
.Sys
tem
Exc
ept
ion
se)
{
Sys
tem
.err
.pri
ntln
("O
bje
ct R
eady
failu
re "
+ s
e);
S
yste
m.e
xit(
1);
}
S
yste
m.o
ut.p
rint
ln(c
arr
ier
+ "
re
ady
for
laun
ch !!
!");
tr
y {
bo
a.im
pl_
is_r
ead
y();
}
catc
h (o
rg.o
mg.
CO
RB
A.S
yste
mE
xce
ptio
n se
) {
S
yste
m.e
rr.p
rint
ln("
Imp
l Rea
dy
failu
re "
+ s
e);
S
yste
m.e
xit(
1);
}
} // N
ow
rea
dy
to s
erv
e r
em
ote
invo
catio
ns
on
carr
ier
Exa
mpl
e 2
Ser
ver
Impl
emen
tatio
n
37
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Exa
mpl
e: T
ime
Ser
vice
�C
all p
rovi
des
curr
ent t
ime
(on
serv
er)
�C
ode
to w
rite:
�ID
L�
Ser
ver
�S
tart
s O
RB
�In
itial
izes
Ser
vice
�G
ives
IOR
to th
e ou
tput
�C
lient
�T
ake
s IO
R�
Cal
ls s
ervi
ce
������������������
� ����
��������������
���������
�������������
������
����������
��
��
38
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Tim
e S
ervi
ce C
ompo
nent
as p
art o
f the
ser
ver
impl
emen
tatio
n (J
ava)
������������������ ���
������
����� ��
�����
�������������������
�������
������������� ���������������������
�� !��!
��
"��������
#���
$%
&
��'��������
��������(����
��)��!��
*������+
�������������
�(����
�����"
"������*+
�!�� �
����� �,����-��������
&
���(��
.����/
.0
�(����������
1
1�
39
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Tim
e S
ervi
ceTh
e ot
her p
art o
f the
ser
ver
impl
emen
tatio
n
��
��������������� ���
������
����� ��
�(����
�����
���������������&
�(����
������
���
����*
�����"23
��"
+&
��,
&
����� ���
���
4����� ��� ����*+�
5 �������������������
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4
��
�������������������*5+�
5 ��
�����
�����"�#���
������
��#������/
�,���� �(� �������*��� ���������������"*���+
+�
1 ����!
*����� �,����-��������
�+&
�,���� ��� �������*�+�
1
1
1�
40
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Tim
e S
ervi
ceC
lient
Impl
emen
tatio
n
������������������ ���
������
����� ��
�(����
�����
����������������&
�(����
������
���
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+&
��
����
�����"�#���
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��#������
��
��"263
��,
&
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���
4����� ��� ����*+�
5 ����� ������
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4��� �����"����������*
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+�
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5 ������������� ������������
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4��
�� �����
���������������� ��������������� ����� *���+�
5 �,���� �(� �������*��������� "������*+
+�
��
�����
1 ����!
*����� �,����-��������
�+
&�,���� ��� �������*�+�
1
11�
41
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Tim
e S
ervi
ceE
xecu
tion
����
�������� �� ��� ��
�������������������������
����
�������� �� ������
�������������������������
�����������
42
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Ava
ilabl
e O
RB
s
�Ja
va-b
ased
�IB
M W
ebS
pher
e�
SU
N N
EO
, Joe
: ow
n pr
otoc
ol.
the
Java
Tra
nsa
ctio
n S
ervi
ce
JTS
is th
e JO
E C
orba
Obj
ect
Tra
nsac
tion
Ser
vice
OT
S.
�IO
NA
Orb
ix:
deve
lop
ed in
Ja
va, i
.e.,
OR
Ble
ts p
ossi
ble,
C
++,
Java
-app
licat
ions
�B
EA
Web
Logi
c�
Bor
land
Vis
ibro
ker
(in N
etsc
ape
Com
mun
icat
or)
, IIO
P b
ase
d. A
lso
for
C+
+.
�fr
ee: J
acO
RB
, ILU
, Jor
ba,
Dyn
aOR
B
�C
-bas
ed�
AC
E O
RB
TA
O, U
nive
rsity
W
ashi
ngto
n (w
ith tr
ader
)
�Li
nux
OR
BIT
(gn
ome)
�Li
nux
MIC
O (
kde
1.0
used
it)
�P
yth
on-b
ased
�fn
orb
�ht
tp://
ww
w.o
mg.
org
�[S
zype
rski
CS
13.
4]
43
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Bey
ond
Dyn
amic
Cal
l: T
he T
rade
r S
ervi
ce
A�
��
�
����
�
,�
����
�
K�
��
���
�
���
�
���
���
���
���
�>
����
���.
4)�
���
�>
����
���.
�T
rade
r m
edia
tes
serv
ices
, ba
sed
on p
ublis
hed
prop
ertie
s (
“yel
low
pag
e se
rvic
e”)
�M
atch
mak
ing
44
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
OR
Bs
and
Tra
ders
�T
he O
RB
res
olve
s op
erat
ions
stil
l bas
ed o
n na
min
g (w
ith th
e N
amin
g se
rvic
e =
“Whi
te p
ages
”)
�T
he T
rad
er s
ervi
ce, h
owev
er, r
esol
ves
oper
atio
ns (
serv
ices
) w
ithou
t nam
es, o
nly
base
d on
pro
pert
ies
and
polic
ies
= “Y
ello
w p
ages
”
�T
he tr
ader
get
s of
fers
from
ser
vers
, con
tain
ing
new
ser
vice
s
45
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Mod
i of S
ervi
ce P
rope
rtie
s
�S
ervi
ce p
rope
rtie
s ca
n be
qua
lifie
d by
mod
i: �
“no
rma
l” (c
an b
e m
odi
fied/
dele
ted
),
�“f
ixed
” (m
and
ator
y, c
anno
t be
dele
ted)
, �
“re
adon
ly”
(ca
nnot
be
mod
ified
).
�T
he m
odi o
f the
pro
pert
ies
form
a la
ttice
.
��
��
�$
L�)
��
��
��
�.
K
���
�.��
��
�.
46
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Ser
vice
offe
rs fo
r th
e T
rade
r se
rvic
e
�S
ervi
ce o
ffer
(IO
R, p
rop
erti
es)
�P
rope
rtie
s de
scrib
e se
rvic
es�
Are
use
d by
trad
ers
to m
atch
ser
vice
s to
qu
erie
s
�D
ynam
ic p
rope
rty
�A
pro
pert
y ca
n be
que
ried
dyn
amic
ally
by
the
tra
der
of s
ervi
ce�
The
ser
vice
-obj
ect
can
det
erm
ine
the
valu
e of
a d
ynam
ic p
rope
rty
ane
w
�M
atch
ing
wit
h t
he
stan
dar
d c
on
stra
int
lan
gua
ge�
Boo
lean
exp
ress
ion
s ab
out p
rope
rtie
s�
Num
eric
an
d st
ring
com
paris
ons
47
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Tra
ders
Pro
vide
Ser
vice
Hop
ping
�����
6��
���
6
�����
:��
���
8
�����
7M
����
���
�������
���
��>
��
��
���
���
����
���
�>���
���
��
�
L��
*����
����
����
���
��
���
����
���
=>��. ������
*���
���
�����
�If
a tr
ader
doe
s no
t fin
d a
serv
ice,
it c
an a
sk n
eigh
bor
trad
ers
�D
esig
n pa
ttern
“C
hain
of R
espo
nsib
ility
”
�G
raph
of t
rade
rs
�Li
nks
to n
eigh
bors
vi
a T
rad
erLi
nk�
Tra
derL
ink
filte
rs
and
man
ipu
late
s qu
erie
s vi
a po
licie
s
�A
dis
trib
uted
sea
rch
algo
rithm
(al
so u
sed
in P
2P)
48
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Mod
ifica
tion
of Q
uerie
s
�P
olic
ies
par
amet
eriz
e th
e b
ehav
ior
of
the
trad
ers
and
th
e T
rade
rLin
ks
�F
ilter
s, i.
e., v
alu
es, l
imiti
ng /
mod
ifyin
g th
e q
uerie
s:
�m
ax_s
ear
ch_c
ard:
max
imal
car
dina
lity
for
the
ongo
ing
sea
rche
s
�m
ax_m
atc
h_ca
rd:
ma
xim
al c
ard
inal
ity f
or m
atch
ings
�m
ax_h
op_c
oun
t: m
axim
al s
earc
h d
epth
in th
e gr
aph
��������
������
��������
������
��������
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���
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���� ��� ��
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�
���
���
���
���
��
��
�
�
���
���
���
���
�
���
��
���
�
�����
�
���
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�
����
��
49
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Inte
rfac
es T
radi
ng S
ervi
ce
�B
asic
inte
rfac
es
�Lo
oku
p (
que
ry)
�R
egis
ter
(for
exp
ort,
retr
act
, im
por
t of s
ervi
ces)
�A
dmin
(in
fo a
bout
ser
vice
s)
�Li
nk
(co
nstr
uctio
n of
tra
der
grap
h)
�H
ow d
oes
a q
uer
y lo
ok li
ke?
�Lo
oku
p.Q
uery
( in
Se
rvic
etyp
eNam
e, i
n C
onst
rain
t, in
Po
licyS
eq,
in S
pec
ified
Pro
pert
ies,
in h
ow to
y, o
ut O
fferS
eque
nce,
o
fferI
tera
tor)
50
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
CO
RB
A T
rade
r T
ypes
C�
�1>�
sim
ple
trad
er
C�
�1>�
sta
nda
lon
e tr
ader
C�
�1>�
���
����
��
��
����
��
��
�
��
��
���
��
�
���
1��
��
���$
C�
�1>��
��
����
� ��
��
C�
1
�>
����>
��
��
��
�
����
).
��
���$
C�
�1>��
��
����
� ��
��
���
).
�>��/
��
����
�
��
��
�
C�
�1>��
��
����
� ��
��
C�
1���
).
que
ry t
rad
er
51
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Cor
ba 3
.0si
nce
1999
�P
rovi
des
the
wel
l-def
ined
pac
kagi
ng fo
r pr
oduc
ing
com
pone
nts
�M
essa
ging
�La
ngua
ge m
appi
ngs
that
avo
id h
and-
writ
ing
of ID
L
�G
ene
ratin
g ID
L fr
om
lang
uage
spe
cific
type
def
initi
ons
�C
++2
IDL,
Jav
a2ID
L, …
�X
ML
inte
grat
ion
(SO
AP
)�
Qua
lity
of S
ervi
ce m
anag
emen
t�
Rea
l-tim
e an
d sm
all f
ootp
rint v
ersi
ons
�C
OR
BA
Com
pone
nt M
odel
(C
CM
)�
sim
ilar
to E
JB, s
ee la
ter
�S
crip
ting
(CO
RB
A s
crip
t), a
com
posi
tion
lang
uage
52
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Cor
ba 3
.0 (
cont
.)
�N
ew B
asic
ser
vice
s:
�P
OA
, the
Por
tabl
e O
bje
ct A
dap
ter,
rep
lace
s B
OA
�S
FA
, Ser
ver
Fra
me
wor
k A
dapt
er�
Val
ue
obje
cts
�S
ervi
ces:
�M
essa
ge
Se
rvic
e M
OM
:O
bje
cts
as a
sync
hron
ous
buf
fere
d m
ess
ages
�C
orba
Bea
ns-c
ompo
nent
s �
Scr
ipt l
angu
age
�F
acili
ties
: co
mpo
und
docu
men
ts, M
obile
Age
nts,
BO
F (
busi
ness
obj
ect f
acili
ty)
53
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
PO
A
Por
tabl
e O
bjec
t Ada
pter
�T
he
PO
A is
an
evo
luti
on o
f th
e B
OA
�
Nes
ted
PO
As
po
ssib
le,
wit
h n
este
d n
ame
spac
es�
Roo
t PO
A (
one
per
serv
er)
sta
rted
/acc
esse
d by
OR
B.
�A
PO
A c
an c
rea
te n
ew P
OA
s.�
A P
OA
ma
y se
rve
a gr
oup
of o
bjec
tsan
d h
andl
e re
fere
nces
to th
em.
�P
OA
s ca
n b
e n
amed
�O
RB
mai
nta
ins
a re
gist
ry o
f na
med
P
OA
s, e
.g. f
or r
eact
ivat
ion
as n
eed
ed.
�P
olic
ies
for
ob
ject
man
agem
ent
�
e.g
. Life
span
: tra
nsie
nt /
pers
iste
nt
CO
RB
A::
PO
A
crea
te_P
OA
crea
te_l
ifes
pan
_po
licy
acti
vate
_ob
ject
_wit
h_i
d
th
e_P
OA
Man
ager
(.a
ctiv
ate)
serv
ant_
to_r
efer
ence
...CO
RB
A::
BO
A
crea
teg
et_
idd
ispo
sese
t_ex
cep
tion
imp
l_is
_re
ady
ob
j_is
_re
ady
cha
nge_
impl
eme
nta
tion
de
activ
ate
_im
pl
de
activ
ate
_obj
TDD
C18
Com
pone
nt-b
ased
sof
twar
e. ID
A, L
inkö
ping
s un
iver
site
t. S
lides
by
cour
tesy
of U
we
Ass
ma
nn, I
DA
/ T
U D
resd
en.
Rev
ised
by
C. K
essl
er, 2
005.
Eva
luat
ion
of C
OR
BA
����
�������������
56
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Eva
luat
ion:
Com
pone
nt M
odel
�M
ech
anis
ms
for
secr
ets
and
tra
nsp
aren
cy:
very
goo
d
�In
terf
ace
and
Im
ple
men
tatio
n re
posi
tory
�C
ompo
nent
lang
uage
hid
den
(in
tero
pera
bilit
y)
�Li
fe-t
ime
of s
ervi
ce h
idde
n
�Id
entit
y of
ser
vice
s hi
dden
�Lo
catio
n hi
dden
�N
o p
aram
eter
izat
ion
�M
any
stan
dar
ds
(see
fo
llow
ing
su
bch
apte
rs)
57
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Eva
luat
ion:
Sta
ndar
diza
tion
�Q
uit
e g
oo
d!
�S
ervi
ces,
app
licat
ion
serv
ices
�O
n th
e ot
her
hand
, som
e st
anda
rds
are
FA
T
�T
ech
nic
al v
s. a
pp
licat
ion
sp
ecif
ic v
s b
usi
nes
s co
mp
on
ents
:
�C
orba
has
sta
ndar
ds fo
r te
chni
cal a
nd
appl
ica
tion
spec
ific
com
pon
ents
�...
but
for
busi
ness
obj
ect
s, s
tand
ards
mus
t be
exte
nded
(ve
rtic
al f
acili
ties)
58
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Eva
luat
ion:
Com
posi
tion
Tec
hniq
ue�
Mec
han
ism
s fo
r co
nn
ecti
on�
Mec
hani
sms
for
adap
tatio
n: s
tubs
, ske
leto
ns,
ser
ver
adap
ters
�M
echa
nism
s fo
r gl
uei
ng:
mar
sha
lling
bas
ed o
n ID
L
�M
ech
anis
ms
for
asp
ect
sep
arat
ion
�M
ultip
le in
terf
aces
pe
r ob
ject
�N
oth
ing
for
ext
ensi
on
s�
Mec
han
ism
s fo
r M
eta-
mo
del
ing
�In
terf
ace
Rep
osito
ries
with
type
cod
es, i
mp
lem
enta
tion
repo
sito
ries
�S
cala
bili
ty�
Con
nect
ions
can
not e
asily
be
exch
ange
d (e
xcep
t sta
tic lo
cal a
nd r
emot
e c
all)
59
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Eva
luat
ion:
Com
posi
tion
Lang
uage
�W
eak
�C
OR
BA
scr
iptin
g pr
ovid
es a
faci
lity
to w
rite
glu
e c
ode,
bu
t onl
y bl
ack-
box
com
posi
tion
61
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Wha
t Hav
e W
e Le
arne
d (1
)
�C
OR
BA
is b
ig, b
ut u
nive
rsal
:�
The
Cor
ba-
inte
rfa
ces
are
very
flex
ible
, wo
rk a
nd c
an b
e u
sed
in
pra
ctic
e�
... b
ut a
lso
com
plex
and
fat,
may
be
too
flexi
ble
�If
you
have
to c
onn
ect t
o le
gacy
sys
tem
s, C
OR
BA
wor
ks
�C
OR
BA
has
the
adva
ntag
e of
an
open
sta
ndar
d
�T
o in
crea
se r
euse
and
inte
rope
rabi
lity
in p
ract
ice,
on
e ha
s to
lear
n m
any
stan
dard
s
�T
radi
ng a
nd d
ynam
ic c
all a
re fu
ture
adv
ance
d co
mm
unic
atio
n m
echa
nism
s
�C
OR
BA
was
pro
babl
y on
ly th
e fir
st s
tep,
w
eb s
ervi
ces
mig
ht b
e ta
king
ove
r
62
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
The
End
�A
pp
endi
x:
adva
nced
mat
eria
l on
CO
RB
A
�C
OR
BA
ser
vice
s�
CO
RB
A fa
cilit
ies
�C
OR
BA
and
the
web
, O
RB
lets
�C
OR
BA
faci
litie
s an
d U
ML
prof
iles
�Li
cens
ing
for
busi
nes
s se
rvic
es
TD
DC
18 C
ompo
nent
-bas
ed
softw
are.
IDA
, Lin
köpi
ngs
univ
ersi
tet.
Slid
es
by c
ourt
esy
of U
we
Ass
man
n, ID
A /
TU
Dre
sden
. R
evis
ed b
y C
. Kes
sler
, 200
5.
Cor
ba S
ervi
ces
� ���������������������������
���������������������
��������
�����������
� �����������������������������
���������
����
����������
64
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Ove
rvie
w o
n C
orba
Ser
vice
s
�16
+ st
and
ard
ized
ser
vice
inte
rfac
es (i
.e.,
a lib
rary
)�
Sta
ndar
diz
ed, b
ut s
tatu
s of
impl
emen
tatio
n d
iffer
ent d
epen
din
g o
n pr
odu
cer
�O
bje
ct s
ervi
ces
�D
eal w
ith fe
atu
res
and
ma
nage
men
t of
obje
cts
�C
olla
bor
atio
n s
ervi
ces
�D
eal w
ith c
olla
bora
tion,
i.e.
, obj
ect c
onte
xts
�B
usi
nes
s se
rvic
es�
Dea
l with
bus
ines
s ap
plic
atio
ns
�T
he s
ervi
ces
serv
e fo
r st
anda
rdiz
atio
n.
The
y ar
e ve
ry im
port
ant t
o in
crea
se r
euse
.�
Ava
ilabl
e fo
r ev
ery
lang
uag
e, a
nd o
n di
strib
uted
sys
tem
s!
65
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect S
ervi
ces
�N
ame
serv
ice
(dire
ctor
y se
rvic
e)�
Rec
ords
ser
ver
obje
cts
in a
sim
ple
tree
-like
nam
e s
pace
�(I
s a
sim
ple
com
pone
nt s
yste
m it
self)
�L
ifec
ycle
ser
vice
(allo
catio
n se
rvic
e)�
Not
aut
omat
ic; s
eman
tics
of d
eallo
catio
n un
defin
ed
�P
rop
erty
ser
vice
(fea
ture
ser
vice
for o
bjec
ts)
�P
ersi
sten
cy s
ervi
ce (s
torin
g ob
ject
s in
dat
a ba
ses)
�R
elat
ion
ship
ser
vice
to b
uild
inte
rope
rabl
e re
latio
ns a
nd g
raph
s�
Sup
port
of s
tand
ard
rel
atio
ns:
refe
renc
e, c
onta
inm
ent
�D
ivid
ed in
sta
ndar
d ro
les:
co
ntai
ns,
con
tain
edIn
, re
fere
nces
, re
fere
nce
d
�C
on
tain
er s
ervi
ce (c
olle
ctio
n se
rvic
e)66
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Col
labo
ratio
n S
ervi
ces
�C
om
mu
nic
atio
n s
ervi
ces
�R
esem
ble
con
nect
ors
in a
rchi
tect
ure
syst
ems,
but
can
not
be
exch
ange
d to
ea
ch o
ther
�E
vent
ser
vice
�pu
sh m
ode
l: th
e co
mpo
nen
ts p
ush
eve
nts
into
the
eve
nt
chan
nel
�pu
ll m
odel
: the
com
pon
ents
wai
t at t
he c
hann
el a
nd e
mpt
y it
�C
allb
ack
serv
ice
�C
on
curr
ency
ser
vice
�D
istr
ibu
ted
lock
s
�O
bje
ct t
ran
sact
ion
ser
vice
, OT
S
�F
lat t
rans
actio
ns o
n ob
ject
gra
phs
67
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Bus
ines
s S
ervi
ces
�T
rad
er s
ervi
ce�
Ye
llow
Pag
es, l
oca
lizat
ion
of s
ervi
ces
�Q
uer
y se
rvic
e�
Sea
rch
for
obje
cts
with
attr
ibut
es a
nd th
e O
QL,
SQ
L (O
DM
G-9
3)
�L
icen
sin
g s
ervi
ce�
For
app
licat
ion
pro
vide
rs (
app
licat
ion
ser
vers
)
�Li
cens
e m
ana
gers
�S
ecu
rity
ser
vice
�
Use
of S
SL
and
othe
r ba
sic
serv
ices
68
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Dep
ende
ncie
s B
etw
een
the
Ser
vice
s
Na
mes
Life
-tim
e
Rel
atio
ns
Per
sist
ency
Mar
shal
ling
Co
ncur
renc
y
Tra
nsac
tions
Que
ry
Tra
der
Pro
pert
ies
Sec
urity
Eve
nts
Lice
nses
Col
lect
ions
Ca
llbac
k
69
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect S
ervi
ces:
Nam
es
�B
indi
ng
of
a n
ame
crea
tes
an o
bje
ct in
a n
ame
spac
e (d
irec
tory
, sco
pe,
nam
ing
co
nte
xt).
�A
nam
e sp
ace
is a
con
tain
er w
ith a
set
of b
indi
ngs
of n
ames
to v
alue
s.
�T
hey
can
refe
renc
e ea
ch o
ther
and
bui
ld n
ame
grap
hs
�T
he
rep
rese
nta
tion
of
a n
ame
is b
ased
on
ab
stra
ct s
ynta
x,
no
t o
n t
he
con
cret
e sy
nta
x o
f a
op
erat
ing
sys
tem
or
UR
L.
�A
nam
e co
nsis
ts o
f a tu
ple
(Id
entif
ier,
Kin
d).
�T
he Id
ent
ifier
is th
e re
al n
ame
, the
Kin
d te
lls h
ow th
e na
me
is
rep
rese
nte
d (e
.g.,
c_so
urc
e, o
bjec
t_co
de, e
xecu
tabl
e, p
osts
crip
t,..)
.�
For
cre
atio
n o
f nam
es
the
re is
a li
bra
ry (
desi
gn p
atte
rn A
bstr
act
Fac
tory
).
70
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
��
��
�
,�
���'�
��
��
�
���
��
Use
of N
ames
,.���
�/�
���
��
�
�
�
��
��
��
�
� ��
��
,�
���
� ��
��
��
����
���
��
(�
�
�
����
71
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Nam
ing
Ser
vice
bin
d (
in N
ame
n, i
n O
bje
ct o
bj)
rebi
nd (
in N
am
e n
, in
Obj
ect
ob
j)b
ind_
con
text
rebi
nd_
con
text
mk_
nam
e(S
trin
g s
)O
bje
ct r
eso
lve
unb
ind
( in
Nam
e n
)N
am
ing
Con
text
ne
w_
cont
ext
;N
am
ing
Con
text
bin
d_n
ew
_co
nte
xt (
in N
am
e n
)vo
id d
est
roy
void
list
(..)
_na
rro
w()
Co
sNam
ing:
:Nam
ingC
ont
ext
72
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Nam
ing
Ser
vice
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73
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18 C
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po
ne
nt-
ba
sed
so
ftw
are
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A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
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5.
Nam
ing
Ser
vice
in ID
L
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74
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Nam
ing
Ser
vice
: Exa
mpl
e
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75
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect S
ervi
ces:
Per
sist
ency
�D
efin
itio
n o
f a
Per
sist
ent
Obj
ect
Iden
tifi
er (P
ID)
�re
fere
nce
s th
e v
alue
of a
CO
RB
A o
bjec
t(in
con
tras
t to
a C
OR
BA
obj
ect)
�In
terf
ace
�co
nne
ct, d
isco
nne
ct, s
tore
, res
tore
, del
ete
�A
ttac
hm
ent
to d
ata
bas
es p
oss
ible
76
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Obj
ect S
ervi
ces:
Pro
pert
y S
ervi
ce
�M
anag
emen
t of
lists
of
feat
ure
s (p
rop
erti
es)
for
ob
ject
s
�P
rope
rtie
s ar
e st
ring
s
�D
ynam
ical
ly e
xten
sibl
e
�C
on
cept
wel
l-kn
ow
n a
s �
LIS
P p
rope
rty
lists
, ass
ocia
tive
arra
ys, J
ava
pro
pert
y cl
ass
es
�It
erat
ors
for
pro
per
ties
�In
terf
ace:
�
defin
e_pr
oper
ty,
defin
e_p
rope
rtie
s, g
et_
prop
erty
_val
ue,
get_
pro
pert
ies,
del
ete_
prop
erty
77
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Col
labo
ratio
n S
ervi
ces:
Tra
nsac
tions
�W
hat
a d
ream
: th
e W
eb a
s d
ata
bas
e w
ith
nes
ted
tra
nsa
ctio
ns.
Sce
nar
ios:
�
Acc
ount
s as
Web
-ob
ject
s.
Tra
nsfe
rs a
s tr
ansa
ctio
n on
the
obje
cts
of s
eve
ral b
ank
s�
Pa
ralle
l wo
rkin
g o
n w
eb s
ites:
how
to m
ake
cons
iste
nt?
�S
tan
dar
d 2
-ph
ase
com
mit
pro
toco
l:
�be
gin
_ta,
rol
lbac
k, c
omm
it
�N
este
d t
rans
acti
on
s �
beg
in_s
ubtr
ansa
ctio
n, r
ollb
ack_
sub
tran
sact
ion,
co
mm
it_su
btra
nsac
tion
TDD
C18
Com
pone
nt-b
ased
sof
twar
e. ID
A, L
inkö
ping
s un
iver
site
t. S
lides
by
cour
tesy
of U
we
Ass
ma
nn, I
DA
/ T
U D
resd
en.
Rev
ised
by
C. K
essl
er, 2
005.
CO
RB
A F
acili
ties
(Sta
ndar
ds fo
r A
pplic
atio
n D
omai
ns)
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79
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Hor
izon
tal F
acili
ties
(app
licab
le in
man
y do
mai
ns)
�U
ser
inte
rfac
es
�P
rint
ing
, Scr
iptin
g
�C
ompo
und
docu
men
tse.
g. O
penD
oc
(sin
ce 1
996
acce
pted
as
stan
dar
d fo
rmat
. Sou
rce
code
has
bee
n re
leas
ed o
f IB
M. N
ow o
bsol
ete
.)
�In
form
atio
n m
anag
emen
t
�M
etad
ata
(m
eta
obj
ect f
acili
ty, M
OF
)
�T
ool i
nte
rch
ange
: a
text
- an
d s
tre
am-b
ase
d ex
chan
ge
form
at f
or U
ML
(XM
I)
�C
omm
on W
areh
ous
e M
odel
(C
WM
):
MO
F-b
ased
met
asch
ema
for
dat
abas
e a
pplic
atio
ns80
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Th
e D
om
ain
tech
nolo
gy
com
mitt
ee (
DT
C)
crea
tes
dom
ain
task
forc
es
DT
F f
or
an a
ppl
ica
tion
do
ma
in
�B
usi
nes
s o
bje
cts
�F
inan
ce/in
sura
nce
�C
urre
ncy
faci
lity
�E
lect
ron
ic c
om
mer
ce�
Man
ufa
ctu
rin
g�
Pro
duct
dat
a m
ana
gem
ent e
nabl
ers
(P
DM
)
�M
edic
ine
(hea
lth
care
Co
rbaM
ed)
�Le
xico
n Q
uery
Ser
vice
�P
erso
n Id
entif
ier
Ser
vice
PID
S
�T
elec
om
mu
nic
atio
ns
�A
udio
/vis
ual s
trea
m c
ontr
ol o
bjec
t�
Not
ifica
tion
ser
vice
�T
ran
spo
rtat
ion
Ver
tical
Fac
ilitie
s(D
omai
n-S
peci
fic F
acili
ties)
TD
DC
18 C
ompo
nent
-bas
ed
softw
are.
IDA
, Lin
köpi
ngs
univ
ersi
tet.
Slid
es
by c
ourt
esy
of U
we
Ass
man
n, ID
A /
TU
Dre
sden
. R
evis
ed b
y C
. Kes
sler
, 200
5.
CO
RB
A, W
eb a
nd J
ava
82
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Cor
ba a
nd th
e W
eb
�H
TM
L s
olv
es m
any
of
the
CO
RB
A p
rob
lem
s
�H
TT
P o
nly
fo
r d
ata
tran
spo
rt
�H
TT
P c
ann
ot c
all m
etho
ds, e
xcep
t by
CG
I-ga
tew
ay-f
unct
iona
lity
(CG
I = c
omm
on g
atew
ay in
terf
ace)
�B
ehin
d th
e C
GI-
inte
rfac
e is
a g
ener
al p
rogr
am
, com
mu
nica
ting
with
H
TT
P v
ia u
ntyp
ed e
nviro
nmen
t var
iabl
es
(H
AC
K!)
�H
TT
P s
erv
ers
are
sim
ple
OR
Bs,
pag
es a
re o
bjec
ts
�T
he U
RI/U
RL-
nam
e sc
hem
a ca
n be
inte
grat
ed in
to C
OR
BA
�IIO
P b
eco
mes
a s
tan
dard
inte
rnet
pro
toco
l�
Sta
ndar
d p
orts
, UR
L-m
appi
ngs
and
stan
dard
-pro
xies
for
firew
alls
w
ill b
e av
aila
ble
�C
OR
BA
is a
n e
xten
sio
n o
f H
TTP
of
dat
a to
co
de
83
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
CO
RB
A a
nd J
ava
�Ja
va is
an
idea
l par
tner
for
CO
RB
A :
�B
yte
cod
e is
mob
ile�
App
lets
: m
ove
calc
ula
tion
s to
clie
nts
(th
in/th
ick
clie
nt p
robl
em)
�ca
n be
use
d fo
r m
igra
tion
of o
bjec
ts, O
RB
s, a
nd a
gent
s �
Sin
ce 1
999
dire
ct C
OR
BA
sup
port
in J
DK
1.2
�ID
L-to
-Jav
a m
appi
ng, I
DL
com
pile
r, J
ava-
to-I
DL
com
pile
r,
nam
e se
rvic
e, O
RB
�C
orba
sup
port
s fo
r Ja
va a
dis
trib
uted
inte
rope
rab
le in
fras
truc
ture
�Ja
va im
itat
es f
un
ctio
nal
ity
of C
orb
a�
Bas
ic s
ervi
ces:
R
emot
e M
etho
d In
voca
tion
RM
I,
Java
Nat
ive
cod
e In
terf
ace
JNI
�S
ervi
ces:
ser
ializ
atio
n, e
vent
s�
App
lica
tion-
spec
ific
serv
ice
s (f
acili
ties)
: re
flect
ion,
pro
pert
ies
of J
avaB
ean
s84
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Cor
ba a
nd th
e W
eb (
Orb
lets
)
�O
RB
s ca
n be
writ
ten
as b
ytec
ode
appl
ets
if th
ey a
re w
ritte
n in
Jav
a (O
RB
let)
�C
oupl
ing
of H
TTP
and
IIO
P:
�D
ownl
oad
of a
n O
RB
let w
ith H
TT
P
�T
alk
to th
is O
RB
to g
et c
onta
ct to
ser
ver
�R
epla
ces
CG
I hac
ks!
�W
ill b
e re
aliz
ed in
web
ser
vice
s (s
ee la
ter)
.
87
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
CO
RB
A F
acili
ties
and
UM
L P
rofil
es
�S
ince
200
0, th
e O
MG
des
crib
es d
omai
n-sp
ecifi
c vo
cabu
larie
s w
ith
UM
L pr
ofile
s
�P
roba
bly,
all
CO
RB
A fa
cilit
ies
will
end
up
in U
ML
prof
iles
88
TD
DC
18 C
om
po
ne
nt-b
ase
d so
ftw
are
. ID
A,
Lin
köpi
ng
s u
niv
ers
itet.
S
lide
s b
y co
urt
esy
of U
we
As
sma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Wha
t Are
UM
L P
rofil
es?
�U
ML
dia
lect
of
an a
pp
licat
ion
-sp
ecif
ic d
om
ain
�W
ith n
ew s
tere
otyp
es a
nd ta
gged
val
ues
�C
orre
spon
ds
to a
n ex
tens
ion
of t
he U
ML
met
amod
el
�C
orr
espo
nd
s to
a d
om
ain
spec
ific
lan
gu
age
�W
ith o
wn
voca
bula
ry�
Eve
ry e
ntry
in m
etam
ode
l is
a te
rm
�C
orr
espo
nd
s to
an
on
tolo
gy in
UM
L�
If do
mai
n is
larg
e e
noug
h
89
TD
DC
18 C
om
po
ne
nt-
ba
sed
so
ftw
are
. ID
A,
Lin
köp
ing
s u
niv
ers
itet.
S
lide
s b
y c
ou
rte
sy o
f U
we
Ass
ma
nn,
IDA
/ T
U D
resd
en
. R
evi
sed
by
C.
Ke
ssle
r, 2
00
5.
Exa
mpl
e U
ML
Pro
files
�E
DO
C E
nte
rpri
se D
istr
ibu
ted
Ob
ject
s C
omp
uti
ng
�M
idd
lew
are
pro
file
s: C
orb
a, .N
ET
, EJB
�E
mb
edd
ed a
nd
rea
l tim
e sy
stem
s:
�S
PT
pro
file
on s
ched
ula
bilit
y, p
erfo
rman
ce, t
ime
�R
aven
scar
Pro
file
�
HID
OO
RS
Pro
file
on r
eal-t
ime
mo
delli
ng
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ww
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