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Flat Committed Join in Join

Flat Committed Join in Join. Hern á n Melgratti joint work with Roberto Bruni and Ugo Montanari Dipartimento di Informatica - Università di Pisa. Committed Join (cJoin). Join + primitives for negotiations Syntax:. P,Q ::= 0 | x  ŷ  | def D in P | P|Q D,E ::= J  P | D E

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Flat Committed Join in Join

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  1. Flat Committed Join in Join Hernán Melgratti joint work withRoberto BruniandUgo Montanari Dipartimento di Informatica - Università di Pisa

  2. Committed Join (cJoin) • Join + primitives for negotiations • Syntax: P,Q ::= 0 | xŷ| def D in P | P|Q D,E ::= JP | DE J,K ::= xŷ | J|K Processes Definitions Patterns Workshop Finale Cometa – Dec, 2003

  3. Committed Join (cJoin) • Join + primitives for negotiations • Syntax: Messages M,N::= 0 | xŷ | M|N P,Q ::= 0 | xŷ| def D in P | P|Q D,E ::= JP | DE J,K ::= xŷ | J|K Processes Definitions Patterns Workshop Finale Cometa – Dec, 2003

  4. Committed Join (cJoin) • Join + primitives for negotiations • Syntax: Messages M,N::= 0 | xŷ | M|N P,Q ::= M| def D in P | P|Q D,E ::= JP | DE J,K ::= xŷ | J|K Processes Definitions Patterns Workshop Finale Cometa – Dec, 2003

  5. Negotiation Compensation Committed Join (cJoin) • Join + primitives for negotiations • Syntax: Messages Programmable abort M,N::= 0 | xŷ | M|N P,Q ::= M| def D in P | P|Q | abort|[P:Q] D,E ::= JP | DE | JP J,K ::= xŷ | J|K Processes Definitions Patterns Merge definition Workshop Finale Cometa – Dec, 2003

  6. Committed Join (cJoin) • Operational Semantics (CHAM Style): heating and cooling reaction Workshop Finale Cometa – Dec, 2003

  7. Committed Join (cJoin) • Operational Semantics (CHAM Style): Contract P evolves in isolation Compensation Q is kept frozen Workshop Finale Cometa – Dec, 2003

  8. Committed Join (cJoin) • Operational Semantics (CHAM Style): Global Resources Commit Workshop Finale Cometa – Dec, 2003

  9. Committed Join (cJoin) • Operational Semantics (CHAM Style): Compensation on Abort Workshop Finale Cometa – Dec, 2003

  10. Committed Join (cJoin) • Operational Semantics (CHAM Style): Merge n ongoing contracts Workshop Finale Cometa – Dec, 2003

  11. Example: Mailing List ML MailingListk  MLDef Workshop Finale Cometa – Dec, 2003

  12. Example: Mailing List ML MailingListk  MLDef MLDefdef …  in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  13. Example: Mailing List ML MailingListk  MLDef MLDefdef …  lsty | addx  …  lsty | tellv  …  lsty | close   … in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  14. Example: Mailing List ML MailingListk  MLDef MLDefdef …  lsty | addx  def zv,w  xv | yv,w in lstz  lsty | tellv  …  lsty | close   … in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  15. Example: Mailing List ML MailingListk  MLDef MLDefdef …  lsty | addx  def zv,w  xv | yv,w in lstz  lsty | tellv  [def w  0 in yv,w| lsty : lsty]  lsty | close   … in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  16. Example: Mailing List ML MailingListk  MLDef MLDefdef nilv, w  0  lsty | addx  def zv,w  xv | yv,w in lstz  lsty | tellv  [def w  0 in yv,w| lsty : lsty]  lsty | close   … in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  17. Example: Mailing List ML MailingListk  MLDef MLDefdef nilv, w  0  lsty | addx  def zv,w  xv | yv,w in lstz  lsty | tellv  [def w  0 in yv,w| lsty : lsty]  lsty | close   0 in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  18. Implementing flat cJoin • Goal • To implement cJoin in Join • Key Points • Distributed commit of interacting negotiations as a global decision • Participants can join dynamically (participants statically unknown) • First step • Consider flat negotiations • Use canonical form of processes • Encode canonical flat cJoin processes as Join processes Workshop Finale Cometa – Dec, 2003

  19. Flat cJoin • Negotiations cannot be nested • Type system for cJoin Processes: • P: 0, P does not contain [_:_] at all • P: 1, P may contain [_:_] in the definitions • P: 2, P may have and generate flat negotiations • Join Processes have type 0 • Subject Reduction holds for 0 and 2 • Flat cJoin: The sub-calculus of all P:2 Workshop Finale Cometa – Dec, 2003

  20. Canonical Flat cJoin • Inspired by the basic shapes of ZS nets • Few elementary definition patterns • Any flat process can be written in canonical form Workshop Finale Cometa – Dec, 2003

  21. Has type 2 • lsty | tellx  ay,x • ay,x  [def w  0 in yv,w| lsty : lsty] Has count = 2 ay,x  [def w  0 in def bv,w,l,y yv,w| ly in bv,w,lst,y : lsty] Canonical Form: Example def nilv, w  0  lsty | addx  def zv,w  xv | yv,w in lstz  lsty | tellv  [def w  0 in yv,w| lsty : lsty]  lsty |close   0 in kadd, tell, close | lstnil Workshop Finale Cometa – Dec, 2003

  22. Encoding: Main Idea • Any message in a negotiation runs in a thread, which is managed by a coordinator • Coordinators perform a D2PC protocol [BLM2002]. • A variant of the decentralized 2PC with a finite but unknown number of participants • When a participant P is ready to commit it has only a partial knowledge of the whole set of participants • Only those who directly cooperated with P • To commit P must contact all its neighbors and learn the identity of other participants from them Workshop Finale Cometa – Dec, 2003

  23. Encoding: D2PC • Every participant P acts as coordinator • During the transaction P builds its own synchronization set LP of cooperating agents • When P is ready to commit, P asks readiness to processes in LP (if empty P was isolated and can commit) • In doing so, P sends them the set LP • Other participants will send to P • either a successful reply with their own synchronization sets • or a failure message • (in this case, failure is then propagated) • Successful replies are added to LP • The protocol terminates when LP is transitively closed Workshop Finale Cometa – Dec, 2003

  24. Encoding a negotiation [def z  0 in z : 0] Workshop Finale Cometa – Dec, 2003

  25. Encoding a negotiation [def z  0 in z:0] A negotiation with one thread Workshop Finale Cometa – Dec, 2003

  26. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z  0 in z:0] A negotiation with one thread A coordinator Dto manage z def D Workshop Finale Cometa – Dec, 2003

  27. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z  0 in z : 0] def D Compensation Workshop Finale Cometa – Dec, 2003

  28. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z  0 in z : 0] Set initial compensation def D cmp 0 in state {cmp} Compensation Workshop Finale Cometa – Dec, 2003

  29. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z  0 in z: 0] def D cmp0 in state {cmp} z runs in a managed thread Workshop Finale Cometa – Dec, 2003

  30. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z  0 in z: 0] z carries the ports of its coordinator def D cmp0 in state {cmp} | | def … pl, ,  inzput, abt, {lock} z runs in a managed thread Workshop Finale Cometa – Dec, 2003

  31. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z 0 in z : 0] def D cmp0 in state {cmp} | | def … inzput, abt, {lock} It consumes managed msgs Workshop Finale Cometa – Dec, 2003

  32. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z 0 in z : 0] z carries the ports of its coordinator def D cmp0 in state {cmp} | | def zp, a, l  … inzput, abt, {lock} It consumes managed msgs Workshop Finale Cometa – Dec, 2003

  33. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z 0in z : 0] def D cmp0 in state {cmp} | | def zp, a, l  … inzput, abt, {lock} The thread ends Workshop Finale Cometa – Dec, 2003

  34. Encoding a negotiation • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z 0in z : 0] D can commit def D cmp0 in state {cmp} | | def zp, a, l  pl, ,  inzput, abt, {lock} The thread ends Workshop Finale Cometa – Dec, 2003

  35. Encoding an abort • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z abortin z : 0] def D cmp0 in state {cmp} | | def zp, a, l  … inzput, abt, {lock} The thread aborts Workshop Finale Cometa – Dec, 2003

  36. Encoding an abort • put: to notify thread completion • abt: to notify thread abortion • lock: to receive partners’ confirmations • state: to set the initial compensation [def z abortin z : 0] D aborts def D cmp0 in state {cmp} | | def zp, a, l  a inzput, abt, {lock} The thread aborts Workshop Finale Cometa – Dec, 2003

  37. Encoding: Fork and Join x  y|z Workshop Finale Cometa – Dec, 2003

  38. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 Workshop Finale Cometa – Dec, 2003

  39. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} Workshop Finale Cometa – Dec, 2003

  40. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , Workshop Finale Cometa – Dec, 2003

  41. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , | state1{a,abt2} | state2{a,abt1} Workshop Finale Cometa – Dec, 2003

  42. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , | state1{a,abt2} | state2{a,abt1} x|y  z Workshop Finale Cometa – Dec, 2003

  43. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , | state1{a,abt2} | state2{a,abt1} yp2,a2,l2  def D x|y  z xp1,a1,l1| Workshop Finale Cometa – Dec, 2003

  44. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , | state1{a,abt2} | state2{a,abt1} yp2,a2,l2  def D in zput, abt1,l1 l2{lock} x|y  z xp1,a1,l1| Workshop Finale Cometa – Dec, 2003

  45. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , | state1{a,abt2} | state2{a,abt1} yp2,a2,l2  def D in zput, abt1,l1 l2{lock} | p1 l1 l2{lock}, {abt,a2} , | p2 l1 l2{lock}, {abt,a1} , x|y  z xp1,a1,l1| Workshop Finale Cometa – Dec, 2003

  46. Encoding: Fork and Join x  y|z xp,a,l  def D1  D2 in yput1, abt1,l{lock1,lock2} | zput2, abt2,l{lock1,lock2} | pl{lock1,lock2}, {abt1,abt2} , | state1{a,abt2} | state2{a,abt1} yp2,a2,l2  def D in zput, abt1,l1 l2{lock} | p1 l1 l2{lock}, {abt,a2} , | p2 l1 l2{lock}, {abt,a1} , | state{a1,a2} x|y  z xp1,a1,l1| Workshop Finale Cometa – Dec, 2003

  47. Encoding: Names [def zx xx in zy: 0] Workshop Finale Cometa – Dec, 2003

  48. Encoding: Names [def zx xx in zy: 0] [def zx  xx in yy: 0]  Workshop Finale Cometa – Dec, 2003

  49. Encoding: Names [def zx xx in zy: 0] [def zx  xx in yy: 0]  [yy | def zx  xx in 0: 0] * Workshop Finale Cometa – Dec, 2003

  50. Encoding: Names [def zx xx in zy: 0] [def zx  xx in yy: 0]  [yy | def zx  xx in 0: 0] * yy  Workshop Finale Cometa – Dec, 2003

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