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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:  S6 L" f; u* A. u

9 M7 A# K8 }6 F/ U5 b public Object buildActions () {% n9 J" ~9 |- T# j5 n' ^5 L
    super.buildActions();
) n2 U% `& {3 a' C  w    6 A, x. |- Q. r: E
    // Create the list of simulation actions. We put these in
7 b8 L( u* `  k6 |* K' U    // an action group, because we want these actions to be. V; a9 J5 u' R! U: L
    // executed in a specific order, but these steps should) k1 o* B( K# u& b2 U) y$ N
    // take no (simulated) time. The M(foo) means "The message
6 v9 x' u2 Q( q) v5 t    // called <foo>". You can send a message To a particular6 @( m% q6 `+ P+ M
    // object, or ForEach object in a collection.2 L. f' v& q) R: c2 A
        
' d& \- U3 ]4 Q# S! j6 W8 g8 [    // Note we update the heatspace in two phases: first run1 }) _: j. ?8 O
    // diffusion, then run "updateWorld" to actually enact the
% [9 f# J; b' M; P; I1 W& x( |* y    // changes the heatbugs have made. The ordering here is% ^0 y0 C0 @+ X! n
    // significant!
( Q7 Q- T& I2 X        
! C7 y, g8 h2 q" ^, O    // Note also, that with the additional
" w( T+ j. o$ b% {0 ]2 e9 K& ?    // `randomizeHeatbugUpdateOrder' Boolean flag we can
- `: N5 T( y) l4 ?! J& O+ s    // randomize the order in which the bugs actually run) J6 g* H: F3 U. I$ z/ |3 m
    // their step rule.  This has the effect of removing any
/ l) u3 M" J: n' ^0 X    // systematic bias in the iteration throught the heatbug
; O! q5 R6 @% @  Z9 i' a. s/ s    // list from timestep to timestep% ?2 X) Q  G% k# K- y
        / N& T/ P% F& ^) G$ a
    // By default, all `createActionForEach' modelActions have
8 D5 t9 [, o% j5 P    // a default order of `Sequential', which means that the! |( D" n8 o: H0 G! m# A: d
    // order of iteration through the `heatbugList' will be. G: N! Z5 \1 K; w0 {6 r
    // identical (assuming the list order is not changed. C% H% d2 q$ Z3 m
    // indirectly by some other process).
. h' |5 \: Y' q' C5 ]7 k/ F! O   
; r4 y& ]2 @3 ]* _    modelActions = new ActionGroupImpl (getZone ());$ i7 G6 J- h4 p: l- |

6 I( @% ^" ?2 O* [' q- ~    try {+ ?! d+ Q; M, S, {* l: R# Q
      modelActions.createActionTo$message
# P2 {/ u% f1 k        (heat, new Selector (heat.getClass (), "stepRule", false));
  w" T: V2 O1 t! T, _1 i    } catch (Exception e) {
  y0 A! {1 S' ~' M% _6 @  V8 T      System.err.println ("Exception stepRule: " + e.getMessage ());% r. |- j9 f5 L! F
    }
% F4 ^- |/ v4 N9 a# W. G9 q
- U4 ~  d7 f& T5 J    try {
) i: r- m6 Z1 p0 Y      Heatbug proto = (Heatbug) heatbugList.get (0);
! _7 N8 r; V) Y( [9 @      Selector sel =
' _9 \- ~- G  @/ |; k6 R6 |+ F        new Selector (proto.getClass (), "heatbugStep", false);( i: K/ {, ?: ]+ o& L
      actionForEach =
8 L" d8 L4 ^# d/ X5 O5 r3 i. G3 R        modelActions.createFActionForEachHomogeneous$call* _3 D# }, e! S  }  l* t! X
        (heatbugList,
# q( ?* P/ D8 m6 n% a5 O' d         new FCallImpl (this, proto, sel,
! L) w: U) {) A2 S                        new FArgumentsImpl (this, sel)));* U" T1 H3 a9 G" K2 d
    } catch (Exception e) {
7 w  P# C: d: w      e.printStackTrace (System.err);
3 N, N6 }* j* d& `    }* S6 t' k4 }4 `, ~; ]
   
$ w9 A, m$ ]2 d$ o2 J% [    syncUpdateOrder ();
) y; K) r+ r, m* f2 L5 c6 H$ g$ S& `% J! M/ G, Q# D
    try {
4 f4 _& m8 b+ Z" A$ L2 Y      modelActions.createActionTo$message ; z# ~5 u9 W. F3 `+ P% `0 r; t
        (heat, new Selector (heat.getClass (), "updateLattice", false));
  Q' d$ [0 f5 `, H+ H# L' O9 @    } catch (Exception e) {) A4 v) g- a( V' l- Z+ f6 P0 W; X$ H
      System.err.println("Exception updateLattice: " + e.getMessage ());* A" d/ {6 g7 {0 Y
    }' O6 a0 Q" I# Z: n' H. ]) t( d
        / K* A; t$ |: u) c
    // Then we create a schedule that executes the
9 }7 u& s# I3 B    // modelActions. modelActions is an ActionGroup, by itself it+ w3 I7 ^6 l# ~- }/ F. w( l
    // has no notion of time. In order to have it executed in
8 ^/ b, ]) ?* s2 g4 z7 \3 t    // time, we create a Schedule that says to use the
9 y$ e& w! ?: W    // modelActions ActionGroup at particular times.  This8 |# p- l- P7 @" [
    // schedule has a repeat interval of 1, it will loop every' \3 u# b8 N9 W2 P4 h
    // time step.  The action is executed at time 0 relative to9 d! }  E* b4 u2 h( S: x( F
    // the beginning of the loop.
8 j% p5 \8 y1 B, k, D% @+ y/ q8 E4 V) c
    // This is a simple schedule, with only one action that is
, Q2 i  }+ h, e0 b0 R7 L( c    // just repeated every time. See jmousetrap for more7 f# {& w5 ]' o" Y7 B: H
    // complicated schedules.
0 w' v3 ~; l5 q5 q9 h' v- }% M  6 I$ T( ~" L7 L
    modelSchedule = new ScheduleImpl (getZone (), 1);
. R1 ~6 M9 t# U; U/ V, J    modelSchedule.at$createAction (0, modelActions);- e/ O7 d- c# ~9 e9 H% l
        
5 `1 D7 h5 k) _- d    return this;" c# U0 P: G: k2 R* a8 S, }% a
  }
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