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[求助] 问jheatbugs-2001-03-28中某些代码

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发表于 2008-5-25 02:15:22 | 显示全部楼层 |阅读模式
5仿真币
HeatbugModelSwarm中buildActions部分,3个try分别是做什么?查了下refbook-java-2.2,解释太简略,还是不懂,高手指点,谢谢!代码如下:
- z; F" b: ]% `7 z# P! c
9 n4 A2 d& {  q2 P- Q, o public Object buildActions () {7 H# h) s8 h* l6 \, B  \) a
    super.buildActions();  p* f* [3 ~5 N# S. }/ E7 i: ]
   
  u2 S- G' N, M( W. k) k    // Create the list of simulation actions. We put these in
' m7 q; a/ a) c    // an action group, because we want these actions to be& A# h5 P' R& ?! v3 h. i
    // executed in a specific order, but these steps should
( l# Z. D8 d* L( \3 n# j9 C: ~" n    // take no (simulated) time. The M(foo) means "The message
& T  k3 {3 X. \2 K: ~' m: D8 A    // called <foo>". You can send a message To a particular) b  O- m5 I7 p  c9 n- |
    // object, or ForEach object in a collection.
+ p* A, @. \. h: h& [8 N        
; X$ }) P# E2 l2 }0 m6 Z, ]    // Note we update the heatspace in two phases: first run  P, }( S0 _) D. X/ p
    // diffusion, then run "updateWorld" to actually enact the
6 w1 a+ d! ]- a4 k    // changes the heatbugs have made. The ordering here is# p5 ?+ k, Q, x
    // significant!
% C3 X4 B  q" W4 H0 h        
# d3 Q) Y& s3 z- g( j7 P    // Note also, that with the additional) t( E% E6 x; l; F3 o* ]/ S! u- c
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
2 P; g( V( }' C5 I    // randomize the order in which the bugs actually run
7 V, o6 }% @7 n5 J4 v2 P8 @3 E( R    // their step rule.  This has the effect of removing any
4 Z" q0 S% x* g1 Q2 R$ G    // systematic bias in the iteration throught the heatbug: i" D5 u* o7 V$ `- q3 y
    // list from timestep to timestep: E( I; a; [1 M( W" }8 ]" ~
        + X. G* W+ K, e9 o( M9 K! d
    // By default, all `createActionForEach' modelActions have
! ^, [9 ]2 ?( z. S( d    // a default order of `Sequential', which means that the# N5 q' V- w& p/ v& t/ b2 P
    // order of iteration through the `heatbugList' will be
, v4 A! Z9 X2 c. w0 X6 K) b+ ?    // identical (assuming the list order is not changed
5 \. N. V+ D/ ^    // indirectly by some other process).) D: j+ q; j4 C1 V
    ' A& f/ {4 Z! Y0 \) N: Y3 d0 E* p
    modelActions = new ActionGroupImpl (getZone ());; o0 W3 T7 E9 H. Y
. x  Z+ \% D; Y4 i/ T* b. t
    try {
0 U2 H7 L5 A% B6 ?5 q0 ~      modelActions.createActionTo$message
- q8 M! I' H$ R  u        (heat, new Selector (heat.getClass (), "stepRule", false));
5 v* b1 [# S4 L. I    } catch (Exception e) {9 O! E$ X; [8 ~
      System.err.println ("Exception stepRule: " + e.getMessage ());
; ]" `* T/ H% {    }; d* j0 u/ x& P" l% A  _

- y# J' q( w  z    try {
& G0 M& H- f# B      Heatbug proto = (Heatbug) heatbugList.get (0);% T! m2 o% l5 A, E1 v
      Selector sel = , `, W, E) B  j2 J. o1 B
        new Selector (proto.getClass (), "heatbugStep", false);- c% {/ B/ W. J$ n/ g
      actionForEach =7 [5 Z8 g5 J! B0 W: q
        modelActions.createFActionForEachHomogeneous$call
& u* p: p* F8 T% b        (heatbugList,' h7 o0 Z+ |9 P- H; N
         new FCallImpl (this, proto, sel,
6 X6 J, V$ q7 i0 G                        new FArgumentsImpl (this, sel)));7 Z: s  d" y6 Z% @, O* E
    } catch (Exception e) {
. H: }: X- J6 Q8 o  b$ c/ T; e      e.printStackTrace (System.err);7 Q! |4 m$ T# r- D9 E
    }" e( u. W+ g+ B' |8 _( D- S6 h! G# ]
   
9 B% t( C/ o& n    syncUpdateOrder ();' A& C, p. T3 l3 X7 f) ^8 s) U

% N1 @& W6 x% m0 D% i/ }    try {3 p, ]9 o9 d7 S# D" B0 }" J0 m* a
      modelActions.createActionTo$message & f! G2 F' v# b2 K
        (heat, new Selector (heat.getClass (), "updateLattice", false));7 T& E( B7 Y% a* X' _1 N
    } catch (Exception e) {$ G2 x# h/ U' F. N& C  g/ O
      System.err.println("Exception updateLattice: " + e.getMessage ());
: h9 b9 M) ?6 l# y. Q0 p; [2 [2 J    }+ M) U/ G* S3 p$ b* j* O; e4 E
        7 ]1 `! S" y$ Y. c, m
    // Then we create a schedule that executes the
  r6 A3 V  e; X4 v+ Z: Q' I    // modelActions. modelActions is an ActionGroup, by itself it
7 P' m* |: N5 x" w2 C    // has no notion of time. In order to have it executed in" }% a/ ?0 g5 A$ T, F) j/ K
    // time, we create a Schedule that says to use the( D/ Z  z9 l/ g3 Y& }
    // modelActions ActionGroup at particular times.  This2 u* d2 H: _) h+ s7 J2 x. l
    // schedule has a repeat interval of 1, it will loop every
. h/ g/ [" @9 W! |* q" n    // time step.  The action is executed at time 0 relative to
& P/ l# R) m! l# n7 I. p8 w    // the beginning of the loop.. |* i$ a2 W% H; ~% c& @' ?
. R- S0 k5 T. h
    // This is a simple schedule, with only one action that is/ ^; J5 ^) W" B/ Y
    // just repeated every time. See jmousetrap for more
0 w; w, Y3 U5 h8 I/ D    // complicated schedules.1 L  Z( F7 O9 V1 X
  6 N% h' c% P7 n* G- H/ [+ C
    modelSchedule = new ScheduleImpl (getZone (), 1);
; C) A; O9 s2 [% M8 u) z3 o' d    modelSchedule.at$createAction (0, modelActions);
. U* H/ n  G5 T        & r# n' m- N. C; I- q6 K
    return this;# _" Y1 t' R. d
  }
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