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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:+ o+ a& |% G! P- {9 w! q
3 f1 u7 E7 c) Z
public Object buildActions () {4 r$ i: z( ?$ h3 t: I6 P
    super.buildActions();
7 a& w/ y& N$ O, A/ e    ; c" ]7 W9 e0 j, B+ t" R
    // Create the list of simulation actions. We put these in3 e+ L$ @# p) f# a6 H* P/ z$ M
    // an action group, because we want these actions to be1 @/ c' J  A, w( Z
    // executed in a specific order, but these steps should) g9 q  {# s7 ^0 `- V
    // take no (simulated) time. The M(foo) means "The message
3 b% W" G, \  L3 y    // called <foo>". You can send a message To a particular" o! v. g* L7 |) ~( L9 R
    // object, or ForEach object in a collection.
5 j* K3 ~* I4 K* |% c4 J+ D$ Q& K        
  |) Z' @. f, B5 a    // Note we update the heatspace in two phases: first run
+ n. B, p+ [, }6 W    // diffusion, then run "updateWorld" to actually enact the
% s6 n0 L" T& b    // changes the heatbugs have made. The ordering here is' T# ]8 k$ ?% }8 j6 u
    // significant!! L5 k' l$ t0 j% I. A
        / f+ g$ q7 B4 _3 e! t" W( f
    // Note also, that with the additional5 \9 k$ r" g& X: M% R, m
    // `randomizeHeatbugUpdateOrder' Boolean flag we can. v- X# P; I! }$ g$ M
    // randomize the order in which the bugs actually run
: L# w  [# t7 p9 G( v$ V' V8 h    // their step rule.  This has the effect of removing any
* L* F0 S6 {5 W/ N8 r# n. b    // systematic bias in the iteration throught the heatbug6 S+ D: D+ S5 |% u  n. O
    // list from timestep to timestep2 [* u- {2 L5 R6 |8 `6 Z
        . Z  w% i! P, g+ ^2 V  S
    // By default, all `createActionForEach' modelActions have
8 K' N' G2 i0 e8 I7 {. |7 }6 o; S    // a default order of `Sequential', which means that the1 E, X9 F! `# Y4 Y. {0 z  F+ C
    // order of iteration through the `heatbugList' will be
, q9 @8 k& S, ~& M! \    // identical (assuming the list order is not changed; S, U; R( N$ Z; Q
    // indirectly by some other process).$ U+ h, z6 G9 |* J: G! o% _
    / T7 k2 {) `$ c2 `% ?2 y
    modelActions = new ActionGroupImpl (getZone ());
1 R; {, O4 u# C, Z! W( B, {
' A: q* s  w$ n6 e7 ~# R0 Y    try {
- y1 \) e" G/ d      modelActions.createActionTo$message
1 E% H0 }2 F9 ^! \! z0 i        (heat, new Selector (heat.getClass (), "stepRule", false));
9 D& }+ X% Q7 l4 O6 h    } catch (Exception e) {% M/ K) c" }$ |
      System.err.println ("Exception stepRule: " + e.getMessage ());4 D) I& q/ P8 U; F1 M+ Q
    }- ]/ `7 a0 B/ S  U
: v- a% w' M9 M, R$ s) k
    try {
2 X2 \1 V5 F: A; M      Heatbug proto = (Heatbug) heatbugList.get (0);
; Z- d  Z1 {, H! v6 f      Selector sel = 3 E  |; S4 ?, L6 o. P7 n/ c9 o% R
        new Selector (proto.getClass (), "heatbugStep", false);* W( f: W3 ?2 Y# K/ V. Y+ R
      actionForEach =' g. C0 K  K" O; _& H4 L: r9 U3 |
        modelActions.createFActionForEachHomogeneous$call
* P; g8 P9 a+ u$ |: Q  m        (heatbugList,
, Q6 |- a8 m2 E( M" n         new FCallImpl (this, proto, sel,; c) J6 \; N& ]+ L, G
                        new FArgumentsImpl (this, sel)));
/ X. x# i9 O/ L/ K' k; I    } catch (Exception e) {/ G) a( r+ k6 v$ c* J0 x
      e.printStackTrace (System.err);
) Z% a5 r( G' F' d4 Z    }
9 ]$ n; N! T& A# f- b' u' p    - u% N+ }7 E( h* x2 n& v
    syncUpdateOrder ();5 @2 C4 }1 M. s  t# k

0 _* A& g2 a+ V    try {
5 ]' {4 {/ B: i2 Y; @  q      modelActions.createActionTo$message ! A7 L1 }! T! k; |& Q; F
        (heat, new Selector (heat.getClass (), "updateLattice", false));, j% L8 Z' L7 f8 K' u1 w
    } catch (Exception e) {
9 X0 X( {; V* Q      System.err.println("Exception updateLattice: " + e.getMessage ());
- y* ^- F% }1 ^( `/ k( X: C    }
7 L% B- K3 g( b, Q2 U8 D        
2 O% l+ @( q0 H- K' E    // Then we create a schedule that executes the
, ]4 k8 s4 O0 ~! G# Y% I    // modelActions. modelActions is an ActionGroup, by itself it
. x* `, t+ o) }' |    // has no notion of time. In order to have it executed in
. J7 p% ]" A2 z) B    // time, we create a Schedule that says to use the/ ?6 m8 u0 e; ~6 H2 Z& l, A1 Q
    // modelActions ActionGroup at particular times.  This" ~! a6 B- ?- e4 c7 X% Y: _' u7 Y  M# @
    // schedule has a repeat interval of 1, it will loop every
. W4 W; q3 z- [* g. n1 m* Q& O5 z    // time step.  The action is executed at time 0 relative to
* V  `2 z- y0 }  {+ O% T    // the beginning of the loop.6 w" S; b2 I; p9 V( c1 F4 D

/ j+ l7 i, G' K! L' j8 e# I    // This is a simple schedule, with only one action that is
: x/ p, a5 G. v; v9 w    // just repeated every time. See jmousetrap for more
6 l9 E! F3 t9 a  M9 w+ _/ O# o    // complicated schedules.
* N& M( Q8 p6 u7 `: I  m  " P& p  C/ j. S( c1 P0 [: n" F
    modelSchedule = new ScheduleImpl (getZone (), 1);
1 n1 b7 y/ b' G; y; b    modelSchedule.at$createAction (0, modelActions);& y6 g. ?6 q$ O
        ' h. e( O+ k9 U' m- T. y
    return this;% N3 {. l4 w& O& a$ }: ^
  }
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