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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:
  A7 x: `8 X2 V+ j3 Z1 y  J# n$ P
public Object buildActions () {) i7 u- }, z: T5 H! }2 G6 A; _' a: @
    super.buildActions();6 t# l: L/ W2 n6 U
   
$ M1 G5 W3 V9 o& q* b# O    // Create the list of simulation actions. We put these in
- \3 B2 R  Y0 u# |9 I9 o+ K    // an action group, because we want these actions to be
5 ~8 N6 I/ g* @    // executed in a specific order, but these steps should- U6 S2 w, I2 f/ `/ g! T
    // take no (simulated) time. The M(foo) means "The message
5 K4 i5 k  |, o, [" b( w    // called <foo>". You can send a message To a particular& S7 {" X% Y* m8 Z: v  u+ o
    // object, or ForEach object in a collection.; d# x: ^2 x. v% V8 e( ]# m
        
7 i! E# D4 B4 i& p( \' S    // Note we update the heatspace in two phases: first run
6 ]$ U4 p% R; H) ^    // diffusion, then run "updateWorld" to actually enact the
! S) q: @3 `5 r/ i1 `# D/ V$ b* P) W    // changes the heatbugs have made. The ordering here is
' X( X/ |" z: ^8 p  f4 \# c    // significant!
5 l0 ~( ?" t, R5 u: _% b        0 F4 g9 I  c2 }; |+ @+ e( Z
    // Note also, that with the additional& K1 m% U- P! S0 G0 C8 ^
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
  n7 T, x  k, [! d/ z    // randomize the order in which the bugs actually run
) c9 |4 F$ g- ?( U    // their step rule.  This has the effect of removing any2 j7 M( I8 _/ _
    // systematic bias in the iteration throught the heatbug
; O# P# S* n# e: N% x0 _3 i    // list from timestep to timestep7 ~1 x3 x: B" d1 }
        
, Y3 A! G7 q9 I0 }: m8 h' H    // By default, all `createActionForEach' modelActions have3 C2 w) h6 b$ S  w' p. i
    // a default order of `Sequential', which means that the
2 n# d, V- f- H    // order of iteration through the `heatbugList' will be
" @7 ^/ ]& N$ X8 M    // identical (assuming the list order is not changed
/ O$ }  F  i1 c" l0 P    // indirectly by some other process).
* V/ s) W! ]& ?8 g4 d3 R   
% y2 B& t- F3 G  e. t! |    modelActions = new ActionGroupImpl (getZone ());
: ^- v7 S6 C- p# ?) Y$ }
6 h& u4 e+ [5 S2 ^    try {. a0 C2 X4 Q7 f& }7 F8 L* h& \
      modelActions.createActionTo$message
- ]0 c" O! Q7 i; O        (heat, new Selector (heat.getClass (), "stepRule", false));5 U9 v7 X. f% A6 s* x% @# z
    } catch (Exception e) {
( u: o2 O7 s+ Q( J      System.err.println ("Exception stepRule: " + e.getMessage ());
: ~6 m  |5 }- H% [    }
4 i9 b% h) N1 |  J, j0 [0 s
4 P4 V; ?$ D; R' E: _! W1 W    try {9 S" E0 J8 J6 f' T5 C  u( M# ]6 s
      Heatbug proto = (Heatbug) heatbugList.get (0);2 m+ N( |% i! x3 X4 M
      Selector sel =
2 |2 L5 c( Q, Q2 }# b        new Selector (proto.getClass (), "heatbugStep", false);& Q1 c+ @7 v5 \, V, d. o
      actionForEach =! I' A( M7 j: `2 |( C5 J
        modelActions.createFActionForEachHomogeneous$call
+ }4 W" r* \; l& c8 G' |8 g5 D        (heatbugList,
- o0 X* I2 I5 w6 w) k8 u- ?% K         new FCallImpl (this, proto, sel,
/ {. _4 [5 ?* f/ p% f) O0 z, e& Z                        new FArgumentsImpl (this, sel)));
1 a: t& z4 n6 k# U. I    } catch (Exception e) {
7 O* `. q% x# S! x! ]      e.printStackTrace (System.err);
* k" c+ y. y0 t% @    }1 S9 O: o$ w4 ~  b
    ; L( J3 a* e/ w
    syncUpdateOrder ();
4 [$ g2 V- G2 n% g$ C) W' |, C  @# }7 l0 S/ `
    try {
. H; d2 v# S8 m. b. Q      modelActions.createActionTo$message
1 F( {3 J- e  V) e- ]( T7 `# e0 k" }' B        (heat, new Selector (heat.getClass (), "updateLattice", false));
9 M7 s+ W8 {3 P    } catch (Exception e) {
, f* x2 }! Y) R. t  u$ O$ H      System.err.println("Exception updateLattice: " + e.getMessage ());
! G6 [( `( \, v  x  G    }9 p* e9 }  ?9 s
        
6 z6 @. g0 n8 G" e5 o+ J    // Then we create a schedule that executes the
% L3 X: l: h* ?3 U    // modelActions. modelActions is an ActionGroup, by itself it- h- x: T. J# U) G1 D
    // has no notion of time. In order to have it executed in, i* Z9 h$ u. D9 c; ], ~' Z
    // time, we create a Schedule that says to use the2 t4 h; B/ h' B3 Z
    // modelActions ActionGroup at particular times.  This3 b: d! G0 ]- T# o
    // schedule has a repeat interval of 1, it will loop every
- w, A7 N$ S8 f8 k4 C    // time step.  The action is executed at time 0 relative to5 {9 x% A: W& @2 a" ]" |
    // the beginning of the loop.7 u! `9 E" [" Z. n

$ Z& |: u1 H7 U" _    // This is a simple schedule, with only one action that is3 g. R5 x' T* L; L! E
    // just repeated every time. See jmousetrap for more
' U+ E/ |' G7 }    // complicated schedules.; N* C* e% g8 L% O2 G9 C/ c
  # D! g" U5 t  ~/ P$ W
    modelSchedule = new ScheduleImpl (getZone (), 1);
  P0 M' _5 G7 a    modelSchedule.at$createAction (0, modelActions);1 [% A" R' e7 s: @/ F
        
, @% J1 \; z7 `7 m- q. ?3 x6 u- e1 w    return this;5 s) p! U* v" I) L$ o$ Y- I
  }
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