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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:
: n- u: F0 m) J  @0 T3 J$ U1 L& X0 }, W
public Object buildActions () {0 i0 Q' {, Z  ^+ C/ p3 C& N
    super.buildActions();5 z( f2 S! A1 l! |" J
   
  N% D/ p' u$ W" {4 q: Q8 m. i- J6 Q) R    // Create the list of simulation actions. We put these in
1 p# N& C0 x7 M! s    // an action group, because we want these actions to be
$ C5 p8 G0 S9 v    // executed in a specific order, but these steps should
! N# p0 A- l: x/ }    // take no (simulated) time. The M(foo) means "The message/ d6 p/ u# y# W1 \, ?2 d
    // called <foo>". You can send a message To a particular; {( e+ O, g  j' a4 Y
    // object, or ForEach object in a collection.1 k7 T2 x0 ?- ^5 d% j
        4 u* ^1 @! ~6 m* _2 J
    // Note we update the heatspace in two phases: first run5 {2 m! M1 p5 ^' h" T
    // diffusion, then run "updateWorld" to actually enact the
. I5 n; G' W  q9 {, v& f$ \" p    // changes the heatbugs have made. The ordering here is* y% H0 I* {# X4 ~. V- B
    // significant!
  X; J* v. T8 }. J        $ Q; h: s7 @+ }* O) {) ?% K
    // Note also, that with the additional; O7 ^+ G' ^* y+ C8 {
    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 T' |2 q- z2 ~- Y
    // randomize the order in which the bugs actually run
- A  h$ _. d0 }3 W0 _5 |+ E2 X    // their step rule.  This has the effect of removing any
1 \0 O- r/ `: S# C8 G: K: m    // systematic bias in the iteration throught the heatbug
+ e! A4 x: c$ v% c    // list from timestep to timestep, T) L. `! |4 @
        
+ Z: m5 B* j) I1 }    // By default, all `createActionForEach' modelActions have
# W2 d$ N2 T. d6 _) D! r! J    // a default order of `Sequential', which means that the4 d0 B: I: a: v* |$ z
    // order of iteration through the `heatbugList' will be
5 k. Z5 ~, B5 p* N3 e    // identical (assuming the list order is not changed
' k. j; P$ ^3 e& W6 ?8 w: X    // indirectly by some other process).
0 g+ M7 a! |  I8 m   
: `, U) n2 R$ V2 L7 Q7 D6 c8 C    modelActions = new ActionGroupImpl (getZone ());
( Q1 g- s* l' W# u
: i$ c1 j0 z) A- J) v/ h    try {2 T, J. Q) }: F" L( |
      modelActions.createActionTo$message" t( E: e* ?8 b
        (heat, new Selector (heat.getClass (), "stepRule", false));
  g6 \& ]1 y" K, _0 u) S    } catch (Exception e) {
/ \+ j) d: O$ _" a9 \      System.err.println ("Exception stepRule: " + e.getMessage ());
3 ]' s: l. |7 S1 b3 p    }
/ U; w" Z7 `# N! l) ^8 x: M) H' A) n4 c8 [7 f" ?+ ]
    try {
/ `4 Y" X# P1 W; D8 P8 b      Heatbug proto = (Heatbug) heatbugList.get (0);
" J) ^% p) `! a  ?! k; z& H. B* i      Selector sel =
  p6 l9 O: t0 s/ `        new Selector (proto.getClass (), "heatbugStep", false);. D/ F! J+ D! R3 l
      actionForEach =
( D: d: ]  `3 C1 X6 ~6 a        modelActions.createFActionForEachHomogeneous$call
$ u( g& Z1 S9 i- i2 P* A        (heatbugList,
! ~* z) {1 h, Z* ~- o" D         new FCallImpl (this, proto, sel,
) T3 T0 z6 w: A& x2 U                        new FArgumentsImpl (this, sel)));" v6 Y' c/ B) T+ x& l/ x* C/ W
    } catch (Exception e) {( u) W: w8 u& F9 u& }; _) d* h
      e.printStackTrace (System.err);
) v4 W% |' o8 y    }
4 ~& Y; |3 p& Z$ Y0 q    " y6 N6 j) [: J1 l/ e* y
    syncUpdateOrder ();& b/ E% f0 Y; m$ g; I
( j5 Z6 R# G7 Y) v7 Y) B6 k$ i+ l
    try {8 D9 T: I- ?! A1 {4 q* V
      modelActions.createActionTo$message
' C' c* ~: @4 F* C5 f        (heat, new Selector (heat.getClass (), "updateLattice", false));5 g# x, M1 J6 D" l9 R0 A
    } catch (Exception e) {8 A" F0 i/ @( @
      System.err.println("Exception updateLattice: " + e.getMessage ());
4 `* g3 `) Z- T    }
5 [$ d3 U# j7 ~4 R8 `# ^/ B$ ]# r        8 j! P$ L# V: l8 P. E; s
    // Then we create a schedule that executes the. f* q! t+ R! Q, a7 h0 y
    // modelActions. modelActions is an ActionGroup, by itself it. H- \3 g( o- X1 R9 Y9 |
    // has no notion of time. In order to have it executed in
* m- z0 A* B+ n0 n2 z/ W- [    // time, we create a Schedule that says to use the
' U. `7 r& O8 N; h$ F    // modelActions ActionGroup at particular times.  This
$ O0 P( |) V9 }# I; r( p- S! g, }) j. I    // schedule has a repeat interval of 1, it will loop every  N7 h) |+ c* I) p
    // time step.  The action is executed at time 0 relative to
+ S% O' r% w" i, G; s    // the beginning of the loop.  V% R/ L+ T' S! g$ M, V
1 ~: w% M4 ?9 [! H( n5 o; w3 Q% T
    // This is a simple schedule, with only one action that is
! `( X/ `# v1 I% ~. c/ j    // just repeated every time. See jmousetrap for more
; h* @  S2 K0 g) o9 J9 @. ~# u    // complicated schedules.! m$ H! ~5 y) ]# X( L8 \
  & ~* c1 T9 k& l( A+ ?
    modelSchedule = new ScheduleImpl (getZone (), 1);
/ {, h0 y) Q& G- ]( w- n7 v  ^    modelSchedule.at$createAction (0, modelActions);4 C0 ~. E" V  `% ^
        4 Y+ {2 p) B) H9 e3 ^( z% R
    return this;
4 [# v3 k8 D) M: Q6 B  }
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