Preview only show first 10 pages with watermark. For full document please download

A Corba Based Platform As Communication

   EMBED


Share

Transcript

A CORBA BASED PLATFORM AS COMMUNICATION SUPPORT FOR SYNCHRONOUS COLLABORATIVE VIRTUAL ENVIRONMENTS Stephane ´ Louis Dit Picard, Samuel Degrande, Christophe Gransart Universite´ des Sciences et Technologies de Lille Laboratoire d’Informatique Fondamentale de Lille 59655 Villeneuve d’Ascq cedex, FRANCE louisdit, degrande, [email protected] ABSTRACT       !"$#&%')(*+,+ .-  /0   1(*(234 513636 879:<;3=31,,+   = >? A@$B0  , CD3E>E3(* 3F4 ,+, 4HGIDJLKA0M796N1 O+3F = (2,B= 3 0 ,B;P 3 Q- RS1T  $13U79V 5 4W1EX< .YZG  4Q0 XL Z  [,+4 5 4\N/  =] 5 3F/4-3Z S1F;U 4 .   4:XL P 3 )1P"$#&%'^  4:,+ _(` ,,5-Q <;3.13a U BW<= 5 b 3)c([ 3 T d U 13\Ye"$ ,+ f (g  L-2- ;A h(*(634 13\ND13 83Ti  (* $(* .Ei3E>?F4 3H(* = 3(jf[kM13 $F l6(i0 (23+ 13\m 3n  [3 Q+3T]< 4 (*3Td-B)"$#$%' _HkMoFE3Tl*1(*(234 513pY Categories and Subject Descriptors &Y qFY rZs tZuwvdxzy!{|E}4~.tZuwvvPyz€z_‚1ƒ{4„u €P…S|E{.†Zu } ‡pˆ‰ŠN\98<0  PGE;< (*L‹ŒŽf’‘.Ž’“”M•ŒH–.—?— ˜ ŽŠ™–’Ž’š› œw2Y žEY 7Ws Ÿ€! ¡u }vdƒ{4_u € Ÿ.€\{|}5 ¡ƒ ‚1|ˆQƒ€z¢¤£8}5|ˆ|€\{ƒ{4_u €\‰¡N2¥&] 3 ]"&T? 3a4 3 JM3F ’  L‹™=š˜f˜–?“š‘– ’Žf¦•§™=š ¨$— ”E’Žf›F©ªD™š¨$— ”EM•.‘.«¡”5—?—š‘=M•ŒH™š1« š=—•.‘–’Žf¦•¬Oš‘­ œJ.Y 7Y ®8s tZuwvdxhyp{|E}§¯°}5ƒxh±zf‚?ˆ‰ŠNz  0¡98(* 30 3 ,z¥&= & 3 °#&  ,(6‹³²\Žf‘=’”–˜w´•–˜ Žf’µ General Terms (*(634 32ID,+ _(¤9$ T13Z3T$"$#$%'·¶S„, -  Keywords @$Cm(6,BB0¡ \>EB ,- ,+\m1"$#$%'Zm5¶SJ<"8Izm ,+ ,+ O(6,0 4 <4m (2,B(* 4+ /< 4 (*3T6 >E+ 1. INTRODUCTION ! RE3T2 1> 3F= T1 $ p &= +*T4-S p &JM3E .3  3    2@& ,h#A 4 ,BL;W .31,T;Fmw([ 3F;W1,,+  = 5>? *@$B0  ,6C3E>EB13(* 3E·¸¡@$C=¹W (* T 1Yº@$Cd,+  · >1 = ,  +3i $>E ,E- ,„6-   .;2 3i3F = .-B*XL  Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. International Workshop Multimedia Middleware, Ottawa Canada Copyright 2001 ACM 1-58113-396-0/01/10 ... 5.00. » 3W 4 =P .4Y§GF;3.131$@8CD$5>+ 2 &-BW ,,+13H O ;i-R*(6,B= 3 1,B;wNhB3E>?1,>?  A (* 3 13& 3S 4 ,B0M,Bf Z=Q &1,,+  = 513pmw1(*(634 5+3 3H3F = .+3pY'@$Cn,+ 5f(¼ ½EB (* 3F  *s ¾ ‰ŠN ¿   f&(6,B+, §  3FN  3EA,+ 3°3,B;c>EB[ Q 3E>EB13(* 3F[° ,b1,,+   =  1m 1(*(234 5 8 3 H3F = -S 4 =Q 4Y ¿  = /+<13[ 3 *([ 3 T1 (* 3F4NpZ = >1 $  0 , >E+ A_= (* =  m1, 3F0M .>? O 5= & 53T8h (*1<81(*(*13P ? =pY§CO .P 5 3F§(2<& 4>? 6,F4 ,z1F;°D 4 .Q  4QXL 4N /@$Cn,„ 5f ( (6<z5>E„  $,+ ;F h8([ 3 T1  3 Z$<;3.13+a  <=  §h  §,4 5 4S1EX< Y ¿ >? 3F3BÀ  13H 3°3 L-R*(*(634 13\Nz(* =0 3(*°(6<H U5>E+ 4cb3B_;),+ 3EHZ >? 3E ¸f  H4 3Á SXL [ >? 3EmO=Á [ 3nXL [<=  (*EBÀ 4 513pm * 13n([ 3 T1 (* 3EZ >1 3FmO.Á  3F 3T§O, 4 4>E+3TZ 8 13 ¹.YJ¡O(2<5>E+  Âi 3F 1(*(234 513QF,+A[ 4>?1+Q3 .L- RS,+ T° 3 H ([ 3F= 3] *3F = >? *f  ,3TU3] [  4]>EB ,   1Y ¿ 4 ,+ ,+BM;\N(2,B, &   8 , A&X<3° $,+,+  0 = >? Z 13d-B1$ 1,;U T= 3T[ 2½F ,+BM; h >E 1Y JL3° /(6,B0¡ .>EB , -,+wmXL  5 8,4 5 4°3[ >F0 = ,&(* Y)  W1EX< °  Q= 5=  a cF;bÀ ,+ =[ O1, 4m B+3pmE Y'&3*1EX<   4i1Ti  53T*DBA. =  <ZÀ ,+YID >E18@$Cn,„ 5f (* =[ ¶Q'8GGEJL@$Cns ž5‰w 98JM@8Cns q4‰w 46 B4-3[1(*(23B0 4 5+32,+ ;F !f!  >? 3F!3BÀ  13\YD O3 - <1(*(*3 "$EX< A#A 4½F <&%OR? &'A=B . *¸¡"$#&%'8¹$sBÃ1Ã.‰h BÀ0 4 5+385>+ 2 >1 = ,h4  , 8[ & Z >? ,10 (* 3F28@&B ,C3E>EB13(* 3EYbG(* S 1 = SsÃ4ž5‰&  n•.¦•.›i•.‘.¦4ŽŠ™=• Q (* EnÁ ,>? H. 3T1 °b >F0 = ,, 3FY H(* = 3(ÄA1 >? 0¡ > ,+ H ,,4- *R?  W *,+ 3E0¡ >1 8 5.B  m / >1 $([ 3 T1  >EB ,D 3E>EB13(* 3F§ 3d3BÀ 8 i, 3F/ 3E;P= 3T 1Y  2([ 3P, (³ .U H,13U§4 ,+ ,+BM;\N$ f 0 ([ 3 ° . 4  i- 3b [3E(2 Z&,+ 3E6+3 4  Y·' 1,+3nU1,>? °i, (Å6U0M>E„ ° H>EB ,   UsÃ4ž5‰ŠYb'Ai W, 3F.Æ  >1 [ =B . [3EE 63 .0 - R·,„ TmB°[ ], (Ç_[ Q3F = >? Sf  ,+3TNU3) reference 1 object 1 reference 2 object 2 reference n GIOP message object 1 reference object n request object 2 Message packaging GIOP Transport packaging MIOP Network transport UDP/IP Message splitting into n packets packet 1 packet 2 packet n Network packet object n ȁ_É y!}5|dÊ Ë$Ì2±p|H€pu {4_u €bu  É }5u y!x·†*_{4±bŸ4ŸÍi£Îu €{4±p|SÏ_|E ¡{ ˆ4_¢!| Ðhƒ €z¢n†*_{4±:эŸÍi£¼u €c{4±!|W} _É ±\{[ˆ4f¢p|wÒ Packets including MIOP IOR and GIOP message fragment Packets collector Collects packets and rebuilds GIOP messages GIOP message physical network @$Cmp *3F = .+3b(6</ °3]  ,B0Š+(* *3b = Z3 2  </ !+3T1,,+   = >?  13\YD"$! 1 =Z!  [(6,B4 </1(*(234 513d_24 ,+ ,M;Fm 3](6,4 <   ,B0Š+(* /< 4 (*3Ti3W= AiR?  H §3F = >? §_  ,3TY 'AO A1(*(634 5+3O  A([ 1 A3[(6,B+ <4mF,+ f ( T „° 6 3F= ,a 4S >1 4Y 2. THE DESIGN OF OUR PLATFORM " A,+ _(Ó+3E>?,>? A >? = ,z >E m 1Y TYA Q˜š4™=­[•.‘.¦4ŽŠ™=• $ 3°= 2 3 A 54m 5 & (* A+(* mE13,B;[3 $    O2 3[1EX< 4mE  [Œµ › –¨2ŽŠ™8˜š4–?ŒŽ_›E©2•.‘.¦4Ž’™.•$3[=  133 Z3 .-ÔXL 23TS * 3pYQJM3d+Z  4m!-   3F[13,B;Á Q(6,B+ <°"$#&%'Õ  4Á1(*(23+ 13 ,+ ;F 4YhÖ] & 4>? A,+  4*1EX< 13* >? = , 1(* N!- (2<[<;3=3a S B°<=  1Y"$[,„ 5f (×5>+ iL- - ;_w 3T/ & (*  $  z1EX< Nh AÀ<_ d+(*, Sw  c؊Ž¡Ù_•4Ù¤š›w•Q<Úš4š2¨*š4ŒŽ ÛO™–’ŽŠš›1Ü5m*+* 30  4iF;2  p $ (*  (* E63E>?F4 513*(* = 3(Qœ  § 3 Sf 8 >1 = ,pw 5 3P 6 &(* Q؊Ž¡Ùf•4Ù$’‘•–¨6« Ž_›E©[™=š ¨6¨6”E›ŽŠ™–’ŽŠš›1Ü1Nh 3 4[E;6 $ 8!(6,4 < <  (* AF;S 2< 4 (Ý([ 3 T (* 3F >E 1Y 2.1 Multicast ORB Mechanism  §"$#&%'Þ<= 3  =PsBÃ1Ép 1 4[F;* $"$XL &¶Q 30 T1 (* 3E8¥&1b¸¡"§¶W¥§¹ BÀ $ iF1,’mw4 ,, 4U¥$ 3 = , JM3F 0L"$#$%ÝIhF,[¸¡¥$J"8IO¹.mÁ .+ U(*  T1 YÔ T1*, >? ,F1,  À 3 ND /1(*(*3i9§ 5= /#A   3F= 13 ¸¡9$#8¹O2([ SJM9§ßWL; 63 L-R*   3F= 13\m 3SJL30  .1 = , W"$EX< .i#A f  3 P¸’J"$#$¹8W 13F6P 3·XL  3 P [(*  T 2f ([ *¸f ½E <4m  ,;Fmw .5¹.YZ"$#&%'à3  4 P= 3 [,+ ;F *] ;c¥$J"8Ij(*  T YÞGEd W"§¶W¥ ,d À * W34 <2= 3  i,+ ;F 24 ,, 4·JJ"8IÔ¸’JM3F 0 3 JM3F 0L"$#$%bIhF,„¹O-.[ IOÆ JLIhYEJM3*JJ"8IzmF 4 . (* .EH3E>?F4 513Q 4½F <+A 3Fi á .,;H13 § >? 4N 3 JJ<"8I· .f  3 /13,;H 13Fi3 §1EX< 4Y 2.1.1 Group Communications MJ 3W= &*<;3.13a § Z<= 5 2 O 3W1EX< $-BQ  *BQ (* ]1+ m§- (2<W b , ]c T13  b 4 . 1F;FY'&B5-3H3HÀ T ZÃ1mEi ,+,4-âTS1(*(634 50 3S-BQJJ"8IzmE- §(2<RE34-: & f  3 /z 4 =S (*  1F;FYz&5- >? D"$#$%'/m4T12 &(2,B4 <!= 3  D,+ 4;?   ,, 4Q¶S,4 <JL3F 0L"$#&%ÁIhF1,D¸¡¶SJ"8IO¹As rmwÃ4q5‰Šm ,,+4- A4 ,+,F(* .E\13/ >1 = ,hkM„ 3F4 ,l$XL z3/13 OTNp- ¶SJ<"8Izm\ Z .f  3 */ °T 1d _  3 1m!HB§(* 4 3$ 5  >? = ,DXL / 4>? Z 6 (* 2 _  3 1Y*C =U(* EP4 ,, 3* $(2,B4 <h _  3  .á  4Z13i  =6(* .h-.  3Q(* (* ;° 3QXL A-H  _  3 1Y 3F,B;Fm  B§ 8ã&9§IÆ5J1 ,+ P3H1S = (*  Yj'A[- (2<R?  * A3< 3.;[ L-  3[ $@8CD8¸’’Y Y &<= 5   4 .U 5 4P1EX< .¹.mw- 6(6<8 >E+ 2 * ,„ , i(*(60 ȁ_É y!}5|·åwËWÍi€Þ{4±!|bτ| ¡{°{4±!|·vPyzÏ_{4_‚1ƒ ˆ{S‚1uwvvPyz€zf‚ƒ{4_u € ˆ{ƒ‚‡hÐ!ƒ€z¢bu €·{4±!|S} _É ±\{Z{4±!|U¯°Ÿ4Íi£¼vd|ˆ4ˆƒÉ |SˆxzÏf_{{4_€!É!Ò 34 513Q(* = 3(¼-B3W¶SJ<"8IzY 2.1.2 Reliable Communications 2.1.3 Performances '  8= 3 &, >? ,’m i(* E°+3E>?F 13QA13 6¥$J<"8I (*  T1 8 z 3E;i+a $-=H(2<O $ 3FZ1EX< .3T/ (6,B+ <8 _  3 1Y6'&8B§§4-3U3dÀ T iqEm\ 4 =b¥$J<"8I (*  T1 $,3EZ >? .= ,„= T1(* 3EOf = 3  4Nz- 3  4·U5>E+ S P ,+ , Q F1,-=n 3 2 * ,, 33  4Q .&  +>1 2 ,,h(*  T mw3 (* ,B;Fm ,+,h =R? A ,,p(*  T Y 'bÀ<h ? =/fh ,++ , (6,B+ <hH抐_Ú••.› ŒF•.‘‘•«<•.¨2Žf’ —•.‘=ŽŠš4ŒŽŠ™–1˜f˜ µ)•–?™=ÚÁ—–?™=­?•.[”E›’Ž’˜8Ž_*‘•™=•.Žf¦•.–1™=­ › š¬˜+•Œ4©F•.¨*•.› ¨[•..–4©F•.pç.‘<š¨¼–˜f˜‘•™.•.Ž_¦•.‘.èNDD 3*'Aéj¸Š'&=R34-,+ T1 .0 (* 3F.¹  4UF,s ê ‰ŠYZG.WF,84 3P 2 °,13 Z11, (Ô ;*   § /T13BÀ4 3F3 L-Ri= Âi1Y 'ë 13S 1 =Q撐_Ú•/•.› Œ?•.‘Z›”E¨*“=•.‘./•–1™=ÚQ•.›!—–?™=­?•. ¬DŽf_ÚÁ–P”E›ŽŠì”•H›”E¨i“.•.‘U؊Žf› ™‘•.¨[•.›¡–1˜›”E¨*“=•.‘MÜ4ªZ‘•™.•.Ž_¦•.‘.SŒF•« M•™*˜š$—–1™=­?•.’U”EŽf›F©b_Ú•d™”‘=‘•.›i‘•™=•.Žf¦•ŒU—–1™=­?•.*›”E¨*“=•.‘ –› ŒS_Ú•i˜–A‘•™.•.Ž_¦•Œi—–?™=­?•.A›”E¨i“.•.‘=ªA–› ŒW–S¨[•..–4©F•6Žf/•.› ¡šW_Ú•°•.› ŒF•.‘[Žf›nš‘<ŒF•.‘[¡šP‘•«<•.¨2Žf8¨2Žf=Ž_›E©i—–?™=­?•.’èN*/ iK8'Aég¸’K$3W'&=RE34-, 4T (* 3F.¹  4Q F1,s ®4‰¡Y&GE=  F1,§3  4U 3P3À 3B Zo5- =R? m -+=U+$381 4  1N$- 6 4>? 2 °À3 P3E(6 &O .R? .$f / 4 =¥$J<"8I (*  T1 1YzÖ] (6<z  +>1  ,, =R? h36 = hA 3<. ,,¥$J"8IÞ(*  T mD 3 U  i/3°- ;PW  8 6,+ h 8,+ <A .R1 4Y '&8- i .f ZK8'Aé¼  4U F1,§Q'AéÝ  4d 0 ,+_3 L-R6= 5Â*&  13mE- 8  XL< /K8'AéâF1,  ° d,+(*B 4Á3(6 6§ =R? YâC =)33  4 (* .i(6<iRE34-Î S3E(6 2$ =R? 6& 4 =c(* <0  T 1ND3E(6  3F3* A,+ < =R? 4m 3 i + ,  .R1  A 3W'Aéà 1,;S3Q = 6 3 §  13\Y  ° 6 ([ 33TP =R? i 5 S 3F63TU WK8'Aé³ ,B0 ;FY"&z Z BA A'Aéj 1,;°fA $,„ <$ =R? 4mE- 3  4[ZRE34-Þ ,+,w33  4[ m+3T6 6©‘š”5—P•.‘.¦4Ž’™.•§ 3  [< 4W ,T1 B(QY&$-RS83&  3E Q+3Q   4Y'A- 6 5 /+3P i([ ,,!TW3F áE4m- 6i3 $3  4 1(*+a 13A.Q  = 5.F;[  /s ê ‰ŠY !Z 3=([ 5R2#A ,+ ,+ 8¶SJ"8I:¸’#$¶SJ"8IO¹D(*(634 0 13Q,+ ;F 4m- § 4>? 8([ 1 81(* § .á .+(* 3EN ¿ SÀ , *= 3<_ 2 L-  3]M-W(* .Z3TPBíw  3E 3 M-RZ 3 E-„EY!JM (* a h 1O(2,B4 < = 3  ,+ 4;? 5>? ã&9§IÆ5J? . 3[3 A, 3F4YhÖ: 3* &3E(2 p, 3F +2(6,,+ 4F;d3pmD [T,+ ,  2(* U¸f„1(Ä  3  4î  13Fz>E -&¹ z $IÆ5J? ,;$. 30 ¿  T1 P U 3F= 5+3ë 2 Á7 9ïXL W5>? .S3 L-R YÔJ¡ (* a $ Z,+(*B= 5+3§ "$#&%'àf§ 3([ 5+3pN 4 .n 3F= 13c(*EBÀ 4 513Á  3 [d13 S 0 (* /(* 0ŠES4 ,,’m\[$ 4 5 § *T 4 583 L-RH= 5_0 À Y8 23E(2 O,+ ;F $ .L-  3P3 M-RH,+ 4;? i¸’0 X< R? , 3 ¹ 3 [ ,4 13H,+ 4;? §¸’1EX< (*, (* 30 = 3 ¹ 4 5 &1,+ (*f 4 ,B0¡(* §3F = .+3pY 2.2 The Multimedia Streams Management Service over a Multicast ORB ' /Z/ (* a 4dE;UZ á (* 3Fmh"$#&%'V+Z30 A B= , UfSo FE3TÁ1(*(634 5+3:=Þ S (* W 4 ,B0 (* W 3([ 3YÞ'Ó1,13c+* .[(6,B4 <* 4 ,B0Š(* <  (*i M-  3n,+4 5 4·1EX< NQ"$#&%'Ý+i P- 4;b <= ,]  6< 4 (*Y["$§ 1 ,D/  4U3d i'&0 FÆ @&+ ]GE 4 (*3TQ >E UsBÃ4ðmAÃ475‰ŠN*i"§¶W¥g<= 3 =  À 3 ° ]_= (* - Rnf H P >1 ,1(* 3E[ /3E .1 = , <+ 48(2,B(* 4+ <  (*3T ,4 5+3YD DR? ;&1(i0  3 3F  & &<  (Ô13F1, F,p 3 i A3F ’  $   *< 4 (e13F1,O1EX< YS'Vo4-Î/3+  b Z S30 3E&(* 4+ i= 3<f § .L-  3d(2,B(* 4+ i >E Y/  o4-Q4 3â UT1 4)1T  S·_(` Á< 4 (QYÝ  <  (*z 5  .(*+3  48F;&< 4 (ë 3  13F\ p13F= +3§ o4-c 3 +3FYh@&B , >E ¸’@&98 >¹!13(*  E <  (e = N& ;W  * [T1d, >? ,D <= .+3] (6,B+(* .0 + S > Y6 6< 4 (^3E,,+ .[¸¡GE 4 (°O,_¹8 6R1 ; 1(* 13 3F§3U 6< 4 (^ <= ,(* 3F§F,ŠN8Z ,,+4- [+3Q /@$98 >H1T  .4Y§ Z<= 3 5=P5>+ &o á+,   hfOíw . 3FDR3h (6,B(* 4„  >E DF;/íw 3T 6ßpT1FA 3Sä,,!IhÀ,+ § BÀ 4 5+3pNDíw .6 ,4 0 3d >? , AM-[, >? ,&< 4 (*A([ 3 T (* 3F4Yä & ß\T1FZÀ, *13,B;U [GF 4 ([CD3  13F/ 3bGE  (°O,D30  .’  /  Z á 1 4wm -   $_8 2ä,,z À , 1m\ [T 4 5   T  §D3E,p5>E+ 4H  4 .°o 4-â+3F f  §-B3S <  (gA .á  4\Y Ö] U 1 XL<° P<= 3 5=cÁS< 4) 3)(6,4 < 5.B  Nd- W Q W#$¶SJ"8Ij(*(634 13n,+ 4;? °+3  = Z  &< 4 (*3H3 $TYO'&O- § 5 $3Q /(6,4 < 13F áE4m!3,B;Áš› •.¬– µUš.—•.‘–’Ž’š›i  *  4wN8° 63 0 T+ 3  1mp §1  4UF;Q 2<= 3  =\m\ M-  3U >EB ,h > §  4 Y&Ö 2  2+3W Z  6 O 6ß\T1F IhÀ, 1Nh13,B;2 < 4 (à 3  3E 3 Z < 4 (V13F1,,  .á  & B3E .’  1YOCO .°1F;* z / 5 4[1EX<  0 „ 5 4S-BW 6< 4 (g 3  13F4N i  S1EX< .$(*, (* 3E  S@&98 >3F ’  1m 3 · 4 .Á< 4 (ï 3  13F*4 3n S <0 F„ 5 4W-W >? = ,!  PXL Y$GE  (g 3  13F$ 5 ,+4 5 4\mE ;i   3F °”E›ŽŠì”•/˜š©ŽŠ™–1˜ ’‘•–¨Õ•.› Œ.—šŽf›.N  ;H  /(*, (* 3F 4*-BW 6(2,B4 <$"$#&%'¤1EX< 4Y'A BA4-3Q3HÀT1 87m- 3W Z 5 4S1EX< A <([   5  (* 8w 3Ti3  °i §13 $T1S 6< 4 (Qm $ 0 ½F < XL & RE $< 4 (Ý13F1,, 2  2<  (QNDB (*  3p ! 4 =Z1EX< D1F;§(6<z 133 . 4/ABh F0 5 4[< 4 (¼ 3  3E4œE++([  AF;i &< 4 (¼13F1,,  1T1* 8(2,B4 <D (*  (* EZ+3E>?F 13*36 T 1  \< 4 (j 3 13FYD A133 13*     4iXL  B  >? $<  (Ô 3  3EO 4 5  8o 4-: 3 +3F4ND B 4-3H+3°À T 8rm  = 6 5 §13(* 4[AE 4°F;*   4H1EX< ATHo 4-â 3 13F4Y GEH 6< 4 (e+§ .Z 3 U 5= °= 3(*13] 3]<= 54Y* <  (*/([ 3 T1 (* 3F§Z([  iF;W i< 4 (Ä3F1,, 4N2   $< 4 (¼ 3 13F 5 8(6,B+ <A"$#&%':1EX< .m ,+,w0 .= 13A¸’. 4 13\mF <3pm 5¹! 5 ([ 1 363 TY local core remote core 2.1 connect(...) 1. request_ connection(...) stream controller shared object 2.2 connect(...) stream endpoint shared object stream endpoint 2.2 connect(...) 4. link() flow endpoint 4. link() CORBA Reliable MIOP 3. create(...) flow endpoint 3. create(...) ȁ_É y!}5|dñ\Ë/ÌZ±!|UvPyzÏ_{4f‚ƒ ˆ{*ˆ{}5|Eƒ vòˆ|{{4f€!Éx!} u{u\‚1u ÏMÒ 2. local update local core shared object 1. update 6. update remote core 5. consume data shared object 3. produce data flow endpoint flow endpoint flow endpoint 4. send data 4. receive data Multicast streams ȁ_É y!}5|UópË/Ì2±p|UvUyzτ{4f‚1ƒˆ{[ˆ{}5|ƒ vò‚1u vvUy!€zf‚1ƒ{4_u €OÒ < 4 (^13F,+, Z4 3] i(*,+ (* 3F 4W / ° 3F= ,a 4] .0 >E S333TU13c d >1 4md  * Q =B  Q 0 >E+ 4§F;8 <= 3 5=\YD(* 5 4/  h3Z(6, +3F < 4 (*2 >E+ dF;d *<= 3 =wmz °¶SJ<"8Ië(*(634 0 13P,+ ;F 8 3 , 8A[13F1,D ,,z /< 4 (Õ 3  13F$3 13,B;S3 /T1Y'&A,+ _(Ó_,,B;W+< 4]¸’’Y 1YO  3Z 3F= ,+a ° >1 .¹.mF- $  A< ;3T§ $+<13°  $< 4 (g3E,,+ .4Y 2.3 Implementation Ö [ ° Q"& *"$#&%j(*+, - 5 dsBÃr‰_(Å"$EX< . "  3F 4H13 /¸¡"§"§¹2(*, (* 3FO11(*(634 5+3 & ,+ 5f(QYZ8(*+, -  2íw $H >? ,1 8 °313U (*(634 13n,T 0¡+3)1T1: ]„= (* -Rc ,, 4Þ"$ 3 1(*(23+ 13JM3F ’  P¸¡"§J¹.Yzã&3TQ/_= (* - Rd- 4 3P >? ,+Q3 .-¤F,+$=W & [¶SJ"8Ic1(*(634 5+3 ,+ ;F 4Y  Z ,+ , i(2,B4 <8F1,D8(*, (* 3F 4Q+3TQô§ô ,+ 3T1 T1 5>? .Wã$9§IOÆ JLIg 3 :W3F T= 5 4â3F· b¶SJ<"8I ,T0¡3ë W 3Þ áE 313:-=Þ- ]4 ,,Z#$¶SJ"8IÕ¸’#& ,+ , 0 ¶SJ"8IO¹.N5Bhz 1,+ O$<-B.2;3 (*4 ,,B;§ M-  3Z= 3<f .  1, m ,„ , i¸’#$¶SJ"8IO¹ 38¸¡¶SJ"8IO¹.YFÖ:B°(*, 0 (* 3F= 3pm B§8 ,S 1,+ ZH 2JJ<"8I)3U = &H 3E * 63+½F 8XL 4Y  U'A ?Æ @$+ ÁGE 4 (*H .> PQ ,Á(*,+ (* 3F 4n3 ô§ô: 32 D #$¶SJ"8IP1(*(234 513Z,„ ;F ._O< 4 (* ([ 3 T (* 3F4YD &(*, (* 3F= 3°5>+  Z„= (* -Ri  >? ,1H(6,B(* 4„ 2 ,4 13&  ,B;FY 3. THE SPIN-3D CVE GIDJLKA0M79Äs 7 ‰A* d7 9Õ *3F ’  S_*<;3=361,B0 ,+   = >? i- R Y°"$/3F ’  *Z T13 4U_Z([ ,,DT (*  3T1°=: H<= 3FH, 4 3+3T·H0M +T3:B 3Y '&/BZ25-3]+3dÀ T1 °žEmz- * 1 ° S3 .-Ô + ,OT? 50 3a4 513W= RE3T[ > 3F= T Z D §B=W(* 313W 3 W [79 3F = 3i(*E ,E+3T$L-§ > m?13 f  T13 13[ 3     h_O([ 3+,+ 36wXL Y!$  1,,+   = 0 13[ - 5 3 m  =* OO   3F 463i (* &GIDJLKA0M79 F; H,13 m W79Ý   3F= 13b  .Æ5(* ,BLYQÖ] [ 11 ·kL3f . 3 Z= ,+ lH(* = 4N .§  2,+F  4U 3 P = , i3 S3T, *>B ,hF1(QY*GIDJLK&0M7 9Ô 8 ["$#&%'   4H,+ f (g .+ H   >1 1YDJM  &@$B ,\#A 4 ,+BM; ¶SE ,+3TPß! 3T1 T1 W¸’@¶Qß!¹AQ  [79Ô1EX< [sBÉŠNZ @$#$¶QßQ1EX<    3F 4*F;6 >1 = , À ,+m 3* 4 =*À ,+ ȁ_É y!}5|]õwË/öÄÏ_|Eƒ} €zf€!É·ˆ4„{4y!ƒ{_u €Þf€Þ÷p£§Ÿ.…H~=ñøPÒ = 5=  .+a ° Q1EX< 4mf H .á (*, Q d,+TE°[. =  0 a E;UB/1, i 3 ]BZ 1B13pY°Ö *(* >1 6 i@¶Qß -BH §(6,BB0¡ O áE 3+3H3B 4*F;6 - Rip Aßp>F0 3T6Ö ,„T1s ù ‰ŠY"&z $+(*, (* 3F= 13° 13FAh>E -§m _Z [ 5 4U@¶QßbXL 4mp 4 =PB$À ,+8$   3F 4 F;] W"$#&%'Ô1EX< 4YW °<;3.13a4 513  *> , *    /À ,+&8([ 1 ZF;H18(*(634 13W,+ f (QN- 3 Q= 3T *F/3b S 5 4dÀ ,+c¸’’Y YQ W"$#&%'ÔXL .¹.m  S(*(634 3Á,+ f (Å3 BÀ iB6 (* °1+ *<0 3T°3 /F 8w  *¸’’Y 1Y+3T* (* §(* ES3E>?F4 3 (* . 3(°¹86(6,,+ *w 5 H¸’’Y 1YU3TP [< 4 (*3T  .> /(* = 3(°¹.Y /,+ _(g=F1 & 8- ;QD3B0 À4 3QF;H3Ti3_([ 5+3W13F= +3 4S3H §@$#$¶Qßd 0 3TQ 13\N8f 2  =d  4PÀ ,+\m\ . 6/ 3]  3 = ZQ „;5-j i (* *w  2 5 *([ 1 1m! > , 2 .P 3d 5 Z4 3U Uk< 13lH Wk< 3([ 13lY GE°$$= 3 5 3F8f 8 6GIDJLKA0L7 9j1T = (*(* N ; 3,B;° B_;°3f([ 513Q3H $@¶QßP 5+3T* 0 3pœ§(*  5>? * .;c4 3:(*EB_;· W3BÀ4 13)M; P;E0 3 (*4 ,+,B;*F;2. 3T13T§O  -1 3F;24 ,, 8 1(*(634 5+3W,+ _(QY/88 _,!_§ 6 3([ 13  zXL NO 3H1EX<  (*  ,B;[ 3([  4[3TZ< 4 (*+3TY 3F1,A1 = 5+3[13n< 4 (*W¸’.n [  13\m <0 3pmE 5¹ 3* = 8= 3   A([ 1 = 3 5 3F,B;iF;6 1(*(634 5+3S,„ 5f (QY 4. CONCLUSIONS 5. ACKNOWLEDGEMENTS 6. REFERENCES 8  §  3F& 2 +T3d  H"$#&%'à  U(i0 (23+ 13§,„ 5f (â_z<;3.13!@8CY4JM! ,,4-! 5  = / (*3T8 >? = ,1(* Np <;3=13a4 13*O([ 1 F;*3T/(6,4 < (*  &(* .Ei3E>?F4 3S 3 *(6,4 <   ,B0Š+(* U< 4 (*YÝ"$#&%'e 3:H3 - <Q BÀ 4 5+3 .Q &¶SJ"8In 3 S'& FÆ1GF 4 (*3T6 >E §5>E+ / 2o áE0 ,+ P 3 c .Â* 3F[1,3)([ 3F;·$ Q =3+ ,A+  3b@& ,OC3E>EB13(* 3F/,+ _(QYW ° (Ä&GIDJLKA0M79¼ *5>+ 2 i,+ f (Ó-BQ-+=QBA-+,,z / 4 <;S[ >? ,1 <;3.13,+,+  = >? Z ,4 5+3Y    4 5.65X< D    42  D  4ZE;Zä= 3 iú ,= ú 1(¼#&û89j¸Šähc#&û89/¹ 3 i  T+3 ,\13, !K$=E0 Ih $ / ,+ +2¸Šäz#$'AK§CO¹.Y sÃ.‰§#/Y  5 ;Fm ¥2Y%O ,,Šm 3Q&Y¶Q 3pYJL?Æ  iÃr?®1®q50Ã1NÃ4¾¾?® >EB ,w 4 ,+BM;S(*E ,+3Ti,+ 3T1 T1 [¸’>F(*,+¾?®1¹.Y ---§Y >F(*,ŠY  TFÆ1GE BÀ  13=Æ @$#$¶Qß!¾1®1ÆFY s q4‰2"2Y  5,+3P 3Q"2Y8 T 3\Y98>? 80O 6,+ _(¼_ (6,BB0¡ >B ,\ 3E>B3(* 3FYDüš¨$—”M•.‘Z– › Œ ý ‘–.—ÚEŽŠ™m!Ã4®¸Šù?¹.N ùù175þFù1ù¾mDÃ4¾¾17Y s 75‰2&Y98([ mGwY98 T = 3 1m ¥2Y G T1mw&Y  +,,1\m\¶dY 0MßY @$+ \m 3QIzY ID,=ú 3 1< 1Y G+3\N i71H+3F f  8_ F1 = 5>? §-R YA²pŽ_‘.’”–1˜ ´A•–1˜ Žf’µ*ÿ š4™Ž¡•.’ µ Eš”E‘=› –1˜ m Ã4¾1¾¾Y s r ‰2&Y ¥&= 3 $ 3  Y ¶dY ¥$ +\Yã&3T* 3Q°- (6,B4 <+\YJM 3 8ühÿ    –‘–˜f˜+•˜üš ¨$— ”E’Žf›F©[ÿµ M•.¨6 üš›4ç4•.‘•.› ™= • ‘š4™=••ŒŽf›E©mwCD3 3 1 m ¶S á+m'&T< Ã4¾1¾¾Y s ž4‰2&Y ¥&  3 ,T1P 3QG Y % 3f =\Y ¶Q >? 1m 1,,+   = >? />E ,\ 3E>E3(* 3F_  , 0¡13f  33T Y Zü ‘– ›.–?™’ŽŠš›š›büš¨&— ”EM•.‘ 8”E¨*–  › =›M•.‘–?™’Ž’š›m q¸Š7?¹.N q 71¾5þEqùEÃ1m!G  (6 .8Ã4¾¾?žEY s ù5‰Zßp>E+3T6Ö ,+°Ö RE+3T[¥&1pY ¶Q RE3Ti>F(*,\¾?® ,+ 13&3F  3 ,! 3H3F 1 = , 1Y ---§Y >F(*,’Y T?Æ5- RE+3T1T 1=Æ ,>E+3T0Š- ,+=ÆEY s ®4‰Z$Y ß\„ Y ßpT1F0Š- TE ,+ , Z(2,B4 <AF,  BÀ 4 513pYJL3F 3 0¡9$= „4mE= „0M,+  0¡,(*0Mð1ðY áE4m -  4 3 ,ŠY 3+ EY „.Æ ,B(* Æ53  .á\Y F(*,’mw"$ /Ã4¾¾1êY s ê5 ‰ Y &Y ßp3Q 3 WG YIh ,’Y#&(ZpNh Z ,„ , /(6,4 < = 3  AF1,’Y JM 3 $ü ! #" üš›4ç4•.‘•.› ™=$ • ‘š4™=••ŒŽf›F©=m T1 8ÃrÃr5þ ÃrFq rm\¶Q =dþ1¾ùY s ¾5‰Z%&Y ¶Q JL3FM; 8 3 QGwYä 3 .4Y '<+ 4H71°T=  ,+= ;FYJL3d%ÿ  ý8ý  ´ &'  (Püš›4ç•.‘•.› ™=) • ‘<š4™.••ŒŽf›F©m  T A71ùEÃ.þE71®ðEmp"&,„ 3 mäz,+ + *m 1,B;PÃ4¾¾1êY sBÃ4ð5‰2GwY¶S3T1  1mK2YGE 3= 3\m 3H96YGE.(*„E4Y § T13 3 ° BÀ  13W D 6  * FÆ5>E„ i< 4 (*3T  >E+ 1YJM 3 + ühÿÿ-« , ./§–¬O–Žf0Ž =›M•.‘=› –’Ž’š› –1˜Oüš›4ç4•.‘•.› ™=• š›Pÿµ =M•.¨gÿ ™Ž¡•.› ™=•.*üš›ç4•.‘•.› ™.$ • ‘<š4™.••ŒŽf›F©m 8 - Šm ? 3E 5;dþ1¾¾Y sBÃ1Ã.‰2"§¶W¥2Y  §1(*(*3HXL A 4½F <1R? 4N 'A=B  § 3H BÀ4 13Q >13WqEY 7Y "§¶W¥ 98F(* 3Ef([ ,„ƾ1ê50Ã5q50MðEÃ1 m 13 6þ1¾1¾EY sBÃ5q4‰2"§¶W¥2Yã&3 ,+ ,+ §(2,B4 <A3F 0¡HF1,p ½E < fA1 1 ,’Y\"§¶W¥98F(* 3E 1=Æ ¾1¾50=ÃÃ0Ãrm K$5>? (2 8Ã4¾¾1¾EY sBÃ475‰2"§¶W¥2Y 3E,z 3 H([ 3 T1 (* 3F  FÆ5>+  < 4 (* BÀ4 13\Yw"§¶W¥98F(* 3F f([ ,„Æ1qðð1ð50LðEÃ0Mð17E m ? 3E ;Qqð1ððY sBÃr ‰2"§"§&Y  § 1(* 8 T1 Y---§Y FF1Y (°Æ 1 ÆEY sBÃ5ž4‰2GwYÖ:,+3pm2Y G ;F m 3Q¶dY ¶SK$ +,,’Y ã&3Ti  (*„, -  86  A § >? ,1(* 3FD<+ 4 >B ,\ 3E>B3(* 3F ,+4 513Y JL2 3 1°ÿ!ü ý  .435356 üš›4ç4•.‘•.› ™= • ‘š4™=••ŒŽf›E©mwID,a 3\mwa =Q#A ,1m ä  ;SqððÃY