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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:
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public Object buildActions () {; A8 d" I* P* l; K. F5 d5 S( K
    super.buildActions();4 l& }" L) s5 o! Q; x* H  \
    8 a# X* ?5 K) q
    // Create the list of simulation actions. We put these in0 G+ _2 r% x# `5 b' ]; ]$ z
    // an action group, because we want these actions to be
7 G* S) x0 `3 S; o$ w0 c- F    // executed in a specific order, but these steps should
2 ]& J5 k9 T0 p& ^    // take no (simulated) time. The M(foo) means "The message$ k. ?* x- l% G/ r2 E+ n4 j' g
    // called <foo>". You can send a message To a particular  w% `! V# ?1 L9 r$ X
    // object, or ForEach object in a collection.
# t2 H  N, f8 i! v        
9 a: ~6 w7 m% y3 ?    // Note we update the heatspace in two phases: first run
1 }/ {1 W5 n& T, P8 M  U    // diffusion, then run "updateWorld" to actually enact the
; ~# U3 z! W, V4 F3 v2 [/ e    // changes the heatbugs have made. The ordering here is
/ Z! B, q4 S" r7 w$ v# @) x    // significant!: U% o7 _, r& `0 l
        
! u  n6 u+ s% s9 \7 s0 P/ s3 V    // Note also, that with the additional
  |2 _1 ^7 v* f    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 k; P' E; e- V5 H+ S# T    // randomize the order in which the bugs actually run& j6 G$ b. \. [& m+ x5 A
    // their step rule.  This has the effect of removing any
0 x# L: r6 ]6 ^. t3 t    // systematic bias in the iteration throught the heatbug
/ a+ u; H& b; ^# Q/ h- u    // list from timestep to timestep' j# z* h4 [5 t1 g
        & e6 d: Y& _" Q! E( J( A2 G2 b
    // By default, all `createActionForEach' modelActions have# u; v. a6 v0 w5 ~- F& f! s4 c
    // a default order of `Sequential', which means that the
% k# N/ `( a+ n$ o4 {' L5 w    // order of iteration through the `heatbugList' will be& C+ i' k8 ]' e9 @
    // identical (assuming the list order is not changed
2 b/ r5 W* Z3 f& k1 W* t    // indirectly by some other process).
  K. `* B. V; j1 Q: m" }; b, b    & }$ X0 ~$ G% y) j6 y  f/ P$ Q
    modelActions = new ActionGroupImpl (getZone ());: Y0 _9 Z! V2 y  r- x
7 v2 I1 |! D) [* M# R4 I& F, d
    try {
+ ?: Q7 o2 s8 h6 Z      modelActions.createActionTo$message
& t# @' Z4 l6 u$ ^. T' [1 [1 S  I9 h        (heat, new Selector (heat.getClass (), "stepRule", false));' c5 }$ f' a5 G* t
    } catch (Exception e) {  ^* k9 E$ s2 z. L# n5 c5 D' W
      System.err.println ("Exception stepRule: " + e.getMessage ());
4 p; Y9 i$ V( {8 A    }( s9 K5 D/ R9 k
: q) K4 D) M& A
    try {, Z3 H' U8 J% C* o  E
      Heatbug proto = (Heatbug) heatbugList.get (0);; Z+ R) O7 o; |0 z
      Selector sel =
! s/ ~: ^, ~' h5 [8 ^        new Selector (proto.getClass (), "heatbugStep", false);1 T) c9 i- ]* r6 n4 f- r" A! D
      actionForEach =
( G* P! o3 S" V' ^0 Q  J; l        modelActions.createFActionForEachHomogeneous$call" F5 H* p% X- o: E+ \9 Q3 W* X- w
        (heatbugList,
1 ]. m' b. t* n6 h5 ]! @         new FCallImpl (this, proto, sel,7 B8 f9 W* i* c) R& Q1 u4 o
                        new FArgumentsImpl (this, sel)));: z  g% {  a7 D( C
    } catch (Exception e) {
: t0 J5 G+ R: h# K3 Z, w' B& a( P      e.printStackTrace (System.err);# n. P# N4 G% J) t" Y/ `2 p* D
    }
, h; x: |4 N$ |% E* n    * G" K- B) F& D/ A- i* d' a1 A
    syncUpdateOrder ();% l6 x4 X. K7 e+ V: i  @! w* z9 i

; U- Z) p' p: R# h9 N# Z    try {
; Q: P8 j% E6 f4 x' [      modelActions.createActionTo$message + p! X5 Z! B' @0 f
        (heat, new Selector (heat.getClass (), "updateLattice", false));$ J& N% G" T: F& _
    } catch (Exception e) {
/ m3 v( G4 M& M# B  v6 N4 D      System.err.println("Exception updateLattice: " + e.getMessage ());1 O0 H# q+ k5 \7 \) |/ f
    }
0 g/ u: M0 B7 h- p+ u        
9 D$ P. Z4 K$ Z) w3 A0 R6 Y    // Then we create a schedule that executes the- l- k; T$ c9 T
    // modelActions. modelActions is an ActionGroup, by itself it
: ]. j3 F8 O) C    // has no notion of time. In order to have it executed in
* k, l; a9 G$ v, U$ _    // time, we create a Schedule that says to use the
% ?6 z& a. s' \8 k1 h( m6 O# j    // modelActions ActionGroup at particular times.  This& b3 e/ h! `( C' R1 X2 v9 n" o2 x
    // schedule has a repeat interval of 1, it will loop every
1 @  s! Y1 R* t9 Q& {+ C+ V    // time step.  The action is executed at time 0 relative to0 K% B7 J' x, A) ~- Z9 k/ x2 w0 A/ d, k
    // the beginning of the loop.6 N% g8 @4 I  Z* ?; i, @+ d

  Z/ {* M! j7 n& W$ V1 B8 z( V* ]8 o    // This is a simple schedule, with only one action that is
( _  ^. i( S; N4 ^    // just repeated every time. See jmousetrap for more
" p* }# u3 r5 @: {    // complicated schedules.
  w! C7 E1 f% D/ H, ^5 n    l7 |& Z$ d) S; c
    modelSchedule = new ScheduleImpl (getZone (), 1);
. n  U8 I& t# K) x5 [2 S* L; E    modelSchedule.at$createAction (0, modelActions);
: D0 {5 g2 i3 Q3 V% G* {+ G        : ^' R6 O* y7 E. L# f" t! G
    return this;3 u% h# F1 S, g# R4 I" Z
  }
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