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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:
8 A1 K# T. s* m' h9 ?
' X$ B2 v0 T; x public Object buildActions () {* W4 e1 y. J$ U* D( o
    super.buildActions();
! N1 }1 d4 V3 F' y3 }; }  r, z   
! \# D6 q1 ~; z0 L    // Create the list of simulation actions. We put these in
, v; J  a: S1 ]) [    // an action group, because we want these actions to be' I: S# v; f0 y* w
    // executed in a specific order, but these steps should
3 ?6 o$ }2 `  W+ t3 U. }8 x& ^    // take no (simulated) time. The M(foo) means "The message; B' k- y; {- s- [( _
    // called <foo>". You can send a message To a particular) e# I& v  w1 m
    // object, or ForEach object in a collection.
% h; Z1 N5 e8 O1 T% c' {7 G        # |, f# o6 b0 @: c- u
    // Note we update the heatspace in two phases: first run
$ A$ T$ I* @/ A- }1 u+ S1 t    // diffusion, then run "updateWorld" to actually enact the
+ }' E& W; }3 U1 Z' S/ \& g% z5 g, a    // changes the heatbugs have made. The ordering here is5 \7 g3 U' u: B/ D5 j1 `6 o. F
    // significant!
/ @. K' L( ]( V8 w/ i  z$ |1 n" C( R        
: d: `5 |4 v8 G" n    // Note also, that with the additional! [. d- W9 I. g
    // `randomizeHeatbugUpdateOrder' Boolean flag we can. {' n/ L* {$ O6 u3 n/ E
    // randomize the order in which the bugs actually run( h/ ?" L8 @. L- C
    // their step rule.  This has the effect of removing any$ H- W8 U5 H5 c* L$ @7 R1 D' O9 F( B
    // systematic bias in the iteration throught the heatbug
. }8 Q" }2 k9 v6 S6 v7 z! l    // list from timestep to timestep
- k* E# {4 m1 }        
( s6 V; t9 }5 l4 y2 M# }+ f    // By default, all `createActionForEach' modelActions have# c3 z( a" B. r/ @- ?+ ?
    // a default order of `Sequential', which means that the6 Y: z; c! Z! N0 M- k8 o, s
    // order of iteration through the `heatbugList' will be; r; X. d; J* h4 T# I  Z7 Y
    // identical (assuming the list order is not changed
# B1 `: @1 [' c; [' e    // indirectly by some other process).& X# h( b+ ~; |  |  q9 t2 }; @
   
- b5 x, @+ G& P; V- P    modelActions = new ActionGroupImpl (getZone ());0 A3 m4 O% D9 M! A* M/ w% O5 R

+ G+ J. Z2 _% k    try {
0 G' Q% @. N; e1 A- @      modelActions.createActionTo$message- f8 @$ O* @! w0 f0 b. F& i
        (heat, new Selector (heat.getClass (), "stepRule", false));
# d& v# v2 r7 {" k# @0 D    } catch (Exception e) {; {7 p( J: |0 k; x
      System.err.println ("Exception stepRule: " + e.getMessage ());
6 L" O( S) |) h7 N1 V    }
+ I3 A# u; d% F0 [7 Q; h, n
- {6 p9 n3 G7 j0 e# l    try {
$ F& _7 C% O  F8 {9 [      Heatbug proto = (Heatbug) heatbugList.get (0);8 Y0 j, ]! t+ r0 f6 [$ C
      Selector sel = 7 x! N  b* @+ A  o
        new Selector (proto.getClass (), "heatbugStep", false);* D8 {$ Z3 F5 w9 s" }- ]
      actionForEach =6 E1 D% C8 F) N6 d% ^6 B% v; y' t
        modelActions.createFActionForEachHomogeneous$call/ {! r) w$ P- X0 C8 w
        (heatbugList,, b# b+ F! z8 v) N4 e  i
         new FCallImpl (this, proto, sel,* B5 i7 V7 ?. S( N5 a6 |1 B. T0 c
                        new FArgumentsImpl (this, sel)));9 B" X& G9 ]- t/ Q! x& a
    } catch (Exception e) {/ `4 e5 f. n5 x
      e.printStackTrace (System.err);
# u" ^* a) g2 x/ d; e' ~% G    }
. m- P2 Q8 @3 a# j* M- L' w   
) f( u% o8 [' X5 L6 g7 J- f5 n    syncUpdateOrder ();
% s& D' w/ i2 h7 i+ a$ t; ]( S5 o1 x+ G
    try {* \& R# P2 D; u' v7 _/ |
      modelActions.createActionTo$message
$ C# V& x6 c/ I6 J- C  N8 F        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 n. A/ C) ?, u# W; R    } catch (Exception e) {7 l8 J6 ~5 ~* }1 u/ q& [5 ?$ L" y+ B
      System.err.println("Exception updateLattice: " + e.getMessage ());
$ H5 m" t9 i  T- g: N/ s% o    }/ [. o* H7 ]( m2 A5 ?
        
- r  w& \, [6 S  A/ `    // Then we create a schedule that executes the
+ D- m/ H! j. W    // modelActions. modelActions is an ActionGroup, by itself it
$ Z3 \9 B4 v) l( Q8 m/ g. x4 K    // has no notion of time. In order to have it executed in0 N8 v2 k. l0 y  X0 D
    // time, we create a Schedule that says to use the& P- B+ w8 `+ ^/ K
    // modelActions ActionGroup at particular times.  This1 O' N9 U. }& I2 W. c
    // schedule has a repeat interval of 1, it will loop every
1 F" }" O0 Q) D- t$ Z    // time step.  The action is executed at time 0 relative to
8 J+ i4 Z2 ]% l9 X. Q5 E, L, \; {    // the beginning of the loop.4 v) L7 E: @* W$ g" G/ O' F9 p

. c/ H% M) o9 d    // This is a simple schedule, with only one action that is
, F. {) U+ i. b8 G5 d    // just repeated every time. See jmousetrap for more
' }  e) c0 Q9 A    // complicated schedules.2 `; f' @1 `3 B) \
  
+ @8 H6 {5 _7 z, D5 G& e    modelSchedule = new ScheduleImpl (getZone (), 1);
  l+ s2 k! N3 B- [    modelSchedule.at$createAction (0, modelActions);
0 e' a7 \- g- |        # V. T7 N  J& _& ~8 L
    return this;
( N# Z2 w  \5 M7 T! r, Q# |  }
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