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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:
+ v& W% `$ ~6 C% r9 p& Z" L8 C
6 l; M9 a/ G. `% w public Object buildActions () {
9 g0 I8 H* J  l6 v! M    super.buildActions();
6 _/ Z/ z  O8 b9 y/ H6 N   
; z. \/ v( {) W7 I' A2 x    // Create the list of simulation actions. We put these in
+ o( f, y# i% c  [8 s    // an action group, because we want these actions to be% s, h: _3 t1 k2 v. F8 U
    // executed in a specific order, but these steps should! g7 r% N) P/ J% ^0 K) ^
    // take no (simulated) time. The M(foo) means "The message" S' W8 W. Q4 ^1 y% }# K
    // called <foo>". You can send a message To a particular
& ?9 b& i  h  ]5 }9 L$ G+ h    // object, or ForEach object in a collection.' d& z" ^8 h4 ^& R# H3 S0 j
        
% U& B  {, ^9 p1 I0 w  G! o    // Note we update the heatspace in two phases: first run
: |8 V# t1 N; ]  E; y; t- D    // diffusion, then run "updateWorld" to actually enact the# T$ J* T  \3 p4 V; J
    // changes the heatbugs have made. The ordering here is
' _7 k# L! m$ J" q! U9 Q    // significant!
) s* @3 Y. I' _, i; b( S1 p" W3 ?3 {6 O        
) b; U6 e8 I" x0 v" w( ~    // Note also, that with the additional
3 ^7 ]" g# q. f. n3 x4 v    // `randomizeHeatbugUpdateOrder' Boolean flag we can; w9 q( v  I" Q9 p4 v- ^6 @' F
    // randomize the order in which the bugs actually run
! E$ w* r9 B& }& }% d: @) R; f    // their step rule.  This has the effect of removing any
( F; g: u* u5 l6 T    // systematic bias in the iteration throught the heatbug
- P* V) m- |# X! m. W! c/ ?& A& a    // list from timestep to timestep
8 d5 `6 ]4 A. _4 b4 @' w  v        + H& P% e5 U( X8 j" N: c. u
    // By default, all `createActionForEach' modelActions have
+ O! M) Q1 A( b- f" n    // a default order of `Sequential', which means that the" s' ?: s( d- t
    // order of iteration through the `heatbugList' will be
  G5 |4 C/ v) Z7 b    // identical (assuming the list order is not changed
5 E3 `( l) T' g# e- I' F    // indirectly by some other process).) I& M$ Z5 F" s# c. F: @& {
   
* |- l0 T! g5 k. I    modelActions = new ActionGroupImpl (getZone ());
' c+ w  ]9 [" k" E8 S- A
+ R8 J0 S) ]& G9 b    try {( K7 l* m2 a3 e, H' l+ U
      modelActions.createActionTo$message
# T8 M& H2 w# b2 _6 i8 |: |        (heat, new Selector (heat.getClass (), "stepRule", false));. Q$ W- K/ ^- q
    } catch (Exception e) {' o8 v9 Q) p: ?5 u  n2 j) S
      System.err.println ("Exception stepRule: " + e.getMessage ());( u$ [4 K' E' |9 J5 m, B' q6 b
    }( x( j$ D6 t$ p! Y" O/ G. x& _
; C9 s" A1 e. L1 t* ]$ J- Y
    try {+ l+ `8 L4 d6 p! `( v
      Heatbug proto = (Heatbug) heatbugList.get (0);% v& n: Z( I% m0 }  W
      Selector sel = " [; l) x" n" [
        new Selector (proto.getClass (), "heatbugStep", false);
- q' v2 @, O  O/ `      actionForEach =% |' X0 `: N# T* M+ ?
        modelActions.createFActionForEachHomogeneous$call
. y1 o  ?3 M0 E0 o3 q3 L/ z6 |        (heatbugList,
6 U( d9 l6 E2 A5 M/ y         new FCallImpl (this, proto, sel,
! d, V2 b: F1 k3 Y                        new FArgumentsImpl (this, sel)));
  F4 M0 g7 [2 k% k7 N    } catch (Exception e) {  O1 w& I  J% N
      e.printStackTrace (System.err);
: L- d1 U" L1 k8 P    }* ]6 J; }6 D' R2 r0 Y9 E
    - e5 [' W# S- O5 y# F9 a
    syncUpdateOrder ();
) e! u$ e5 c! X2 k, r1 ^1 Y# o. U3 B" A- F
    try {
7 |1 I3 E% y. ]8 w( U      modelActions.createActionTo$message - e7 z9 Z+ C9 p& q: q
        (heat, new Selector (heat.getClass (), "updateLattice", false));
& m; W) x4 l: O7 y- t5 d9 Q* |2 l7 z    } catch (Exception e) {
" x3 O" L% w" e( n      System.err.println("Exception updateLattice: " + e.getMessage ());2 g" w+ F4 c, g
    }
) V2 N% \/ ]9 N* z* x% H        
2 m# [" x  l) t" Z5 o# g. ?    // Then we create a schedule that executes the* ?) r4 z; @- U8 Y3 t2 k  o/ j
    // modelActions. modelActions is an ActionGroup, by itself it
5 G  c2 v9 _7 |$ c    // has no notion of time. In order to have it executed in# y/ y5 a8 E0 r! y3 b
    // time, we create a Schedule that says to use the7 M" j0 Z% [# K: H; T
    // modelActions ActionGroup at particular times.  This7 U) [8 Z, u( C6 F$ i9 ~
    // schedule has a repeat interval of 1, it will loop every
- @, L* Y0 g( c    // time step.  The action is executed at time 0 relative to& U4 v2 C, s; c: b' A: J. g
    // the beginning of the loop.
" }. v, q' F# r+ W4 m& A9 @1 D
7 _( C8 u1 k5 E    // This is a simple schedule, with only one action that is
, |% ^# O1 B8 A& R    // just repeated every time. See jmousetrap for more: T  ?5 ~- ?$ W: ~
    // complicated schedules.
- f& `0 W5 T3 L, W  - T- ^6 Z& x) w
    modelSchedule = new ScheduleImpl (getZone (), 1);
5 v5 Y2 k/ N6 y, Q4 f7 b    modelSchedule.at$createAction (0, modelActions);
  x3 @* h1 s" U) Y2 i- ~" _' g3 c        
3 N/ U3 R3 q6 {4 p" Q% J6 Q- r: @    return this;3 x2 F4 A& o) J, t8 @5 K+ ^8 F
  }
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