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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:
3 o$ n1 V4 m4 v/ Q) O4 ]' b8 p7 E% z$ E, g( g8 @+ |
public Object buildActions () {
) x4 x1 @8 D/ {0 D2 @0 W  R    super.buildActions();$ ~% j2 F# w, p
   
/ p4 l% \4 P) o9 W, [4 p    // Create the list of simulation actions. We put these in& K4 `7 l% v: I$ `
    // an action group, because we want these actions to be
! _0 V% w- d7 P3 i" \( w    // executed in a specific order, but these steps should
( j- T3 r. ~; v5 D+ W% }, D    // take no (simulated) time. The M(foo) means "The message
" v2 P" f/ m% p9 o; d$ K    // called <foo>". You can send a message To a particular7 A! [3 ]% \+ ?' E6 z
    // object, or ForEach object in a collection.8 M# g% r, P; z- v7 P3 b: |7 J
        ) i4 t; g3 U( S$ w- C
    // Note we update the heatspace in two phases: first run
  M; k- ]5 t2 q  K    // diffusion, then run "updateWorld" to actually enact the+ q) X! k' I! U/ M2 |7 F+ d- i
    // changes the heatbugs have made. The ordering here is
3 g, |4 ?# K8 c- O4 Q- c    // significant!
- D+ a8 {: U6 x( s5 X& Z1 n, B        
# H( q6 H  q) o9 \2 I$ t( O    // Note also, that with the additional
9 t2 u: H0 O4 `4 _( ^    // `randomizeHeatbugUpdateOrder' Boolean flag we can  ^+ d& e2 T+ d6 f# `0 U2 j
    // randomize the order in which the bugs actually run+ x! V' N9 {, J9 ~6 _" i5 Z6 L
    // their step rule.  This has the effect of removing any1 o- _9 |  {' @) c
    // systematic bias in the iteration throught the heatbug/ E' f- H, M# l
    // list from timestep to timestep
5 e/ {# z; Q$ k; [: `# f% M( Z        ( ]+ B/ X% M+ w4 ~/ m0 L1 [& m. ^" q
    // By default, all `createActionForEach' modelActions have& r: _: a9 g6 _
    // a default order of `Sequential', which means that the% ]% r5 i- j3 Q
    // order of iteration through the `heatbugList' will be
! B$ P/ u& o1 t- V1 D    // identical (assuming the list order is not changed
+ B0 s) o8 ~7 x) E    // indirectly by some other process).
3 `  Y$ Y# V8 i    ; R- f- a" W$ j
    modelActions = new ActionGroupImpl (getZone ());  ?+ x) E3 }  V+ h; \1 E
7 V5 C0 M6 Z) H' J7 a0 K  r7 }
    try {
% s, E( n8 {! n' N& {# i      modelActions.createActionTo$message8 N! @; S% T% A. G9 H2 `
        (heat, new Selector (heat.getClass (), "stepRule", false));
$ R5 m* s0 j' z' D    } catch (Exception e) {, k" X& ^! C2 {6 N, T+ V
      System.err.println ("Exception stepRule: " + e.getMessage ());
( R4 {  p# m- e    }
: v: P* a& Q4 W. z5 G( F& j
- G; w) Y2 H* R% R    try {9 r4 U6 I& h# J$ {  Y  G
      Heatbug proto = (Heatbug) heatbugList.get (0);
" j* _' W, ]$ F  E& c      Selector sel = ) e" m" w4 K( X8 I. ?/ c9 H
        new Selector (proto.getClass (), "heatbugStep", false);
7 F2 i' t8 N4 {1 A: l% ^1 J+ q      actionForEach =0 |" m. T. F3 x+ |" F: R
        modelActions.createFActionForEachHomogeneous$call9 j" h2 }, B4 E# Q# P5 U  B! O
        (heatbugList,9 e, T9 _. m6 ~- S
         new FCallImpl (this, proto, sel,
9 t# S9 T. z  l                        new FArgumentsImpl (this, sel)));. t2 f$ H' _' ^' [8 X8 N
    } catch (Exception e) {: s" \3 L" G+ s* {3 f1 s. Y3 S$ |
      e.printStackTrace (System.err);
8 U/ w8 K: J( a- l( k2 R3 [    }
* E+ j# g1 a$ h5 l* R6 A   
2 I% M/ a" b$ \1 q! C3 [    syncUpdateOrder ();
3 t# r! V8 S' i5 k% U
+ X( S$ K$ ^* g    try {
. X+ p" u2 L8 _2 Q; ?5 V      modelActions.createActionTo$message
) ?8 s9 R8 G4 q& I4 ~        (heat, new Selector (heat.getClass (), "updateLattice", false));; O2 ^% F! K* r
    } catch (Exception e) {" R. ~' z4 J9 W7 b) S
      System.err.println("Exception updateLattice: " + e.getMessage ());8 o# I% q  s& P- K3 y5 w$ \
    }& [5 d& o4 {0 \% ~4 d) [1 T
        
% A; O1 U+ |# x! _* |8 H    // Then we create a schedule that executes the
+ f" ^6 N) t0 W# a* q    // modelActions. modelActions is an ActionGroup, by itself it
6 l# B/ W2 S; Q3 E, z% F9 X& Y    // has no notion of time. In order to have it executed in0 n2 f. ]# f" m5 {' `5 q
    // time, we create a Schedule that says to use the; P: [" H7 W: g; u
    // modelActions ActionGroup at particular times.  This
: U+ |, o$ N9 R4 f+ z  I  t    // schedule has a repeat interval of 1, it will loop every  q* n  y, E$ Y( i6 a, ~0 j
    // time step.  The action is executed at time 0 relative to, U# F' T. j0 \$ _5 ~. c
    // the beginning of the loop.; K+ i, k( ~; ^" E- q. e4 I2 Z' y

, S. q9 ?0 t' f: e    // This is a simple schedule, with only one action that is
1 D9 C0 @) q1 F7 o; q    // just repeated every time. See jmousetrap for more" b6 [8 n' s4 _  s& e
    // complicated schedules.
0 P. L+ d% g' Y; o- p% {7 t  
! w5 M# o, h3 d: h. m    modelSchedule = new ScheduleImpl (getZone (), 1);0 x# A( l" x$ k4 t  B+ r/ G
    modelSchedule.at$createAction (0, modelActions);
, r% Q( S6 d$ ~        
: n  s4 M0 \! A  ?7 s1 E    return this;) {1 r. N$ F: E, a$ \9 q. w
  }
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