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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:
! G( w4 j2 ~# s  I6 u( a; e# I- N$ ]7 u. o
public Object buildActions () {
, d# n/ x1 w8 ~0 D. x/ a) j/ H    super.buildActions();( E" D* P: U( `! a. k- ~
   
; A. D* M4 J5 W' e+ Q5 F    // Create the list of simulation actions. We put these in0 V5 V$ j" J4 y8 o9 D: u
    // an action group, because we want these actions to be
' V4 \& g/ D4 ^6 X+ G    // executed in a specific order, but these steps should  t' t! s) f( z' \8 s
    // take no (simulated) time. The M(foo) means "The message
0 d- M8 L' b0 o! O; v7 [1 F7 w    // called <foo>". You can send a message To a particular
! N( U6 e( N  |8 k    // object, or ForEach object in a collection.
" M* I$ ]( h0 {% b9 U        % Y3 H& K" _& r  k0 T8 J
    // Note we update the heatspace in two phases: first run
2 D( Z. @* _7 \    // diffusion, then run "updateWorld" to actually enact the3 R8 w$ P- X  e% o5 N
    // changes the heatbugs have made. The ordering here is
, H$ U% h, j7 p' k' T  ]$ o    // significant!
( n( G+ l0 M( m0 p3 }7 C        
9 g: I( G7 x7 ]# Z% }7 ]5 N    // Note also, that with the additional) K3 G5 I9 R, a( I+ `9 W. U
    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 F5 S& G+ L" K: C2 ^7 w: n6 I
    // randomize the order in which the bugs actually run
4 P3 I4 ?1 T5 \+ d    // their step rule.  This has the effect of removing any) }5 w/ \! x$ |0 }% m+ [7 v
    // systematic bias in the iteration throught the heatbug
- \; n$ U& ?: j    // list from timestep to timestep
- x3 X$ J) [& Y. n, F        
* }+ v( r$ R4 u2 e: p( o* F    // By default, all `createActionForEach' modelActions have7 A( z9 o* {" b: {1 T# r3 G
    // a default order of `Sequential', which means that the
& `5 }' E8 J% [8 M; n% T$ ~' i$ {) s' h    // order of iteration through the `heatbugList' will be
! Q% M3 Y' P; j    // identical (assuming the list order is not changed  L- D: v+ i$ k$ r5 G6 r& k
    // indirectly by some other process).5 e& S+ ^" y* ~. E6 M
    $ ]  _6 c* D4 W7 ~& @  h& }
    modelActions = new ActionGroupImpl (getZone ());
, z- a0 I- l5 P* ~' w( O7 \& s$ z7 j; o& h
    try {
+ `7 N' L0 S  S  U9 \      modelActions.createActionTo$message
  r5 G4 d; g) K/ f7 }3 Y        (heat, new Selector (heat.getClass (), "stepRule", false));
$ K! N6 L/ Y" h  Q( a& K+ r    } catch (Exception e) {6 ?! i% b: `9 k3 d
      System.err.println ("Exception stepRule: " + e.getMessage ());! b  |9 ]% P1 o# d9 H. b2 P
    }
! z, _8 k7 r) u# O% P
) m; ]2 u, _6 ?& T& G7 z; O    try {
+ u9 _7 D3 K( c* Y, q      Heatbug proto = (Heatbug) heatbugList.get (0);- u" g2 S) h/ x2 X
      Selector sel =
# b# Z% p$ c/ [. b        new Selector (proto.getClass (), "heatbugStep", false);0 Y$ n! h: Q, d* \0 U6 q# i
      actionForEach =
# B/ B" F6 t" P( D% r        modelActions.createFActionForEachHomogeneous$call
! X& Z$ K1 n( I% M; y        (heatbugList,  ~6 M' a) D" o+ B; i; F
         new FCallImpl (this, proto, sel,
: G3 }4 r1 b& v9 [5 L1 ~- ^                        new FArgumentsImpl (this, sel)));
( ^* O$ f$ X) ~- X: z1 L    } catch (Exception e) {
  Q6 \" a6 A) h2 w8 `4 N+ K      e.printStackTrace (System.err);
; i) t+ F/ J- T; {0 d+ {; Y& Q    }
# {: |* V$ Q( G+ k$ r* M, w   
; K4 a/ V. S# y' W% \8 B3 m    syncUpdateOrder ();9 @! j5 G9 I5 {8 `
# C, X* |3 N3 s9 T! d5 m
    try {
3 l5 X1 k$ r: Y( i* @9 n      modelActions.createActionTo$message ( Z: O6 a2 S2 e6 [
        (heat, new Selector (heat.getClass (), "updateLattice", false));
/ Y7 m: |+ Z6 _; o" d& ^    } catch (Exception e) {0 U! b3 {/ w) r
      System.err.println("Exception updateLattice: " + e.getMessage ());& \  i& M2 e1 ~& P( M, S" B0 L- m0 q
    }, \9 N4 O0 |; [. u  k+ ^
        1 T: q( ]7 U' }* [
    // Then we create a schedule that executes the  J. T; U4 [% N. L: l
    // modelActions. modelActions is an ActionGroup, by itself it; e* e4 k( G, p2 V
    // has no notion of time. In order to have it executed in
, U( ~8 i% s6 Q5 p    // time, we create a Schedule that says to use the7 r$ M2 W3 O7 T; f4 u- \. h$ k0 ]
    // modelActions ActionGroup at particular times.  This
4 F3 y" P2 n% b/ V+ ~    // schedule has a repeat interval of 1, it will loop every* F% Z: ?0 k7 U- f5 d" g
    // time step.  The action is executed at time 0 relative to
/ z1 I* ~* a# h& ~3 z    // the beginning of the loop.
& B: z) r- x' }
; w$ N* p. b# D! P: s( s5 B    // This is a simple schedule, with only one action that is8 D9 _( h- J0 v2 g; i) H
    // just repeated every time. See jmousetrap for more# P7 L- o0 u5 v1 O/ [
    // complicated schedules.
4 R) p. d' |7 Z& Y& P  . J2 m+ W1 E$ o% M
    modelSchedule = new ScheduleImpl (getZone (), 1);
* F( u2 x; v0 x) g. t) ]8 ^    modelSchedule.at$createAction (0, modelActions);
- {- V! q$ h' K! c  a        9 ]+ z* n( N/ R; }4 b& U( A8 n
    return this;8 a- k3 e6 U) _4 B# V
  }
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