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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:
# ?9 X. b: {" {6 H* t4 k" {( P$ a- j8 J1 f; s% B
public Object buildActions () {
6 k7 {" u! P+ F1 p    super.buildActions();* s( J/ L/ T+ ?: m8 h
    2 J2 y$ Y# i8 p! S/ Y
    // Create the list of simulation actions. We put these in
1 Z$ A, L' L% ?/ n# B2 l; r    // an action group, because we want these actions to be
% X2 ~2 d3 g7 c' z, |' m6 b    // executed in a specific order, but these steps should
! r0 f4 ^0 X; c  [' D1 }    // take no (simulated) time. The M(foo) means "The message
) X) V' e8 _0 w% a5 A    // called <foo>". You can send a message To a particular: }. m. c  b1 g) U) M! P/ W" [; p
    // object, or ForEach object in a collection.$ [4 i8 a3 }0 a7 o6 B3 R6 E
        % B; @: l) v3 F- O
    // Note we update the heatspace in two phases: first run. e0 Z/ Z  P- \* l2 a# Z( Y
    // diffusion, then run "updateWorld" to actually enact the
! i9 K) x: v& K, Z, u. Q5 f    // changes the heatbugs have made. The ordering here is; s6 g5 ^; o3 D5 w# C( z! N
    // significant!; d8 Y# ?/ s8 E6 p
        
: h9 X/ N* B0 {) d    // Note also, that with the additional
; f" |+ z5 G/ U4 C% h( A. ~    // `randomizeHeatbugUpdateOrder' Boolean flag we can' U2 G3 F& z$ W! B
    // randomize the order in which the bugs actually run
) U0 L/ v- G$ f. f+ G    // their step rule.  This has the effect of removing any" m2 e6 c' Q& O2 g
    // systematic bias in the iteration throught the heatbug+ j! K) u( q2 c# h' w$ l
    // list from timestep to timestep+ \( r8 M/ h9 @' C( l! |
        
, l8 d$ D- |- K7 K+ ~4 _5 ^    // By default, all `createActionForEach' modelActions have
5 o& G" h9 n2 Y5 k/ T* W0 D    // a default order of `Sequential', which means that the
, _8 U1 V1 t' x% }* i. I    // order of iteration through the `heatbugList' will be6 K4 G. O( L3 m
    // identical (assuming the list order is not changed7 C9 ?9 p4 f& k$ k) {3 W
    // indirectly by some other process).( f) R$ T# Z/ j" y9 x; W8 R% [
   
6 _: p; H) j* O( T& z+ h! R0 N$ u+ O    modelActions = new ActionGroupImpl (getZone ());
9 m, c0 j+ x# M* {
8 I8 w6 I# u- T4 N! `" b4 p    try {1 Z1 |" L% D4 M& D0 Y
      modelActions.createActionTo$message  v1 u5 ?/ }+ w1 j* E% s3 q5 R
        (heat, new Selector (heat.getClass (), "stepRule", false));% [3 Z4 T% N2 j2 g6 m1 ~& Y' c
    } catch (Exception e) {
' F, N( N0 W- {& B) ]      System.err.println ("Exception stepRule: " + e.getMessage ());
1 T5 Q4 y' y7 o    }
) E3 Y9 a5 [' k% R# P2 z+ k3 ]& p! V( L2 C+ n! E( J$ K  U% b
    try {
% h2 ]4 R" I% M9 M+ S: s& i, V      Heatbug proto = (Heatbug) heatbugList.get (0);
3 A0 I4 N! B3 [1 [      Selector sel = $ v- s. u& p1 n, W  M
        new Selector (proto.getClass (), "heatbugStep", false);: g# \6 j5 p  x) P2 _  l, H  d5 I
      actionForEach =
4 q9 U. b! [' r6 S. P        modelActions.createFActionForEachHomogeneous$call
5 S$ h" h7 e9 C- v: m- ?; U/ r* V9 q        (heatbugList,5 o8 I+ ~* f% A5 ?& z) u
         new FCallImpl (this, proto, sel,
5 u8 b5 m$ N9 M* d6 y6 w# S                        new FArgumentsImpl (this, sel)));
& @* @) n7 x" m: e3 W+ p    } catch (Exception e) {
, \. y! V/ b: V! H* e- ]+ s3 C      e.printStackTrace (System.err);: M$ A# q  _, L8 [
    }; }5 F8 _; F: I! D2 ~; e
    & f  k. Q. P. n% Z) T1 M
    syncUpdateOrder ();; |1 Q, A6 `2 x( w4 H
8 F7 B( G# \+ r; q& R4 ?  H
    try {2 t3 p' i) P8 ^6 h4 T5 K$ A. l
      modelActions.createActionTo$message
8 L5 R2 \3 n- f: X" o        (heat, new Selector (heat.getClass (), "updateLattice", false));# z: y/ F* A* Y* P5 [
    } catch (Exception e) {
$ x1 |4 K% B% }) h' e( ?, @      System.err.println("Exception updateLattice: " + e.getMessage ());% C6 Q; i  q# Z3 A0 S
    }
1 a3 _1 e7 t' D: \        
! B3 g6 t0 t2 B& N" T" |  d    // Then we create a schedule that executes the
9 Z; j9 F/ T  A    // modelActions. modelActions is an ActionGroup, by itself it
7 o1 ~. k) I7 J) _/ K    // has no notion of time. In order to have it executed in' Q. A2 ?8 L5 b/ j
    // time, we create a Schedule that says to use the3 u7 _; k  v* P4 p% {
    // modelActions ActionGroup at particular times.  This
/ Z  l: z( J) z1 \, U    // schedule has a repeat interval of 1, it will loop every
8 P. v' \$ I9 ~. L    // time step.  The action is executed at time 0 relative to: t, f, }! I8 y
    // the beginning of the loop.8 I4 ~6 V6 F/ |. O1 E0 {

3 q, f! ?1 [9 [! `" U' H* ]; A    // This is a simple schedule, with only one action that is) N: G  O! M  V+ `; m4 I0 A% p9 @
    // just repeated every time. See jmousetrap for more4 g5 u' H' J0 }1 ?: M
    // complicated schedules.  @( V3 h/ ?- e3 |) f
  , f; Y0 t6 o0 C
    modelSchedule = new ScheduleImpl (getZone (), 1);
0 X' Y6 u+ R4 i5 `2 z! z- s  l    modelSchedule.at$createAction (0, modelActions);
9 l& E; H$ H, w. `  V" t5 J' P        
6 G7 E& h8 |( h7 L- b. A; f    return this;
4 R) {+ R. l6 l1 v8 W; \  }
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