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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:
6 _" n+ y) r7 j8 Y4 n3 n/ q, x+ Q; y' h$ T4 z5 t7 }
public Object buildActions () {* H0 _! d$ E  X3 h$ O; [+ n6 Y
    super.buildActions();* |% S- d; h& e0 X2 q$ J; ]  b: I
    / [' D! W5 [$ i! y
    // Create the list of simulation actions. We put these in) h, z* s- f; W% Q% d6 n2 m
    // an action group, because we want these actions to be. i- q7 |7 G5 w* M7 V% Z: K
    // executed in a specific order, but these steps should
& s6 ^) ~; ~. m- V; d* \    // take no (simulated) time. The M(foo) means "The message. e. K* E! Q: e. r
    // called <foo>". You can send a message To a particular
; B- {# _8 A2 D- c: E3 c    // object, or ForEach object in a collection.
, v5 R! I7 \2 i1 y& {3 C: g        
. x' a$ E  h& o3 y: U    // Note we update the heatspace in two phases: first run
8 s/ x8 w- b- i- a- h3 W7 c$ R& l    // diffusion, then run "updateWorld" to actually enact the, q9 F4 J( p/ e+ L
    // changes the heatbugs have made. The ordering here is
; t: I+ r8 X9 n- v7 Q    // significant!
& f! n% o  r: W0 k& I        
4 `' H- f, e# X/ q. W; \    // Note also, that with the additional7 }1 o* }" ]! B4 l
    // `randomizeHeatbugUpdateOrder' Boolean flag we can; m6 H% o7 H8 ~1 ?3 i# ~
    // randomize the order in which the bugs actually run" S0 w: h! |) {+ f
    // their step rule.  This has the effect of removing any  N. T8 b3 c* [& F
    // systematic bias in the iteration throught the heatbug
  m8 v6 m$ T5 i3 C. T' m    // list from timestep to timestep
! Z  x& k+ R: V7 d: r  h* o        
* v5 z) Y  v( J" q$ i2 k# ?. I    // By default, all `createActionForEach' modelActions have
! V$ d$ {; Y% `+ F- O- s$ P    // a default order of `Sequential', which means that the
$ n4 C" A, ~' H! P# U- C+ A1 D! s    // order of iteration through the `heatbugList' will be
# B: j1 t- |  I    // identical (assuming the list order is not changed, {6 K' X8 ^! Y& _4 v0 I/ l
    // indirectly by some other process).
2 m0 O9 D9 w, ^1 E/ M" D- L% J: T      m# p0 {( r. \/ H2 a/ F
    modelActions = new ActionGroupImpl (getZone ());1 F: d$ k; x" w7 m  E5 b
' ]( b7 P& y; k0 |% a
    try {
- B/ u, o) Q5 y) z1 V  v      modelActions.createActionTo$message& o, z5 k  x1 i
        (heat, new Selector (heat.getClass (), "stepRule", false));
$ A; L( t" M3 N! |    } catch (Exception e) {7 k# i/ F' Q$ m, X$ S7 @
      System.err.println ("Exception stepRule: " + e.getMessage ());- A) `1 E4 J7 U
    }
! p4 B8 \$ p" K: U2 @* z* M$ ]2 v0 r* w# C1 p* m7 C/ `
    try {3 e: ~2 c0 u: D; f
      Heatbug proto = (Heatbug) heatbugList.get (0);  d+ Z( s* n9 U& f5 F4 L0 \! e2 B' y# F( ?
      Selector sel =
! o% Y+ y8 n/ ?4 H' o' j        new Selector (proto.getClass (), "heatbugStep", false);
4 u7 B: b1 k5 T6 p% c! A      actionForEach =
+ F. E; ?5 e* k        modelActions.createFActionForEachHomogeneous$call7 D. l  `4 J  ^; s# T4 Z3 G: N! S, F
        (heatbugList,
  D2 G  A, o8 {2 I' D         new FCallImpl (this, proto, sel,( Y! @) {8 H* b  l% M9 I% p6 J* r$ V
                        new FArgumentsImpl (this, sel)));5 [' ?9 O9 V# K2 Z
    } catch (Exception e) {* v" V& }1 O& |$ m
      e.printStackTrace (System.err);8 v  |/ H8 E, Q7 |. z: c( C% D# L( i
    }8 O' ~8 D! d' K4 _8 |
    1 v' z% G3 j2 Y) N6 [
    syncUpdateOrder ();7 U; }8 Y; D! G. G/ M

8 H; r" J3 x9 ]4 b    try {
& Y6 s, E: a" b% _$ J& i      modelActions.createActionTo$message
+ z, H* Y( m: w8 F6 J$ R& L        (heat, new Selector (heat.getClass (), "updateLattice", false));
3 T6 |# z0 {# G% n    } catch (Exception e) {) e9 I1 x+ l0 D
      System.err.println("Exception updateLattice: " + e.getMessage ());
3 v. y  B; \3 p+ z    }7 ~7 x. E. a1 O+ {, `
        , ?# W3 C+ {  L7 N5 M: f
    // Then we create a schedule that executes the
9 d' E' H6 U3 M    // modelActions. modelActions is an ActionGroup, by itself it2 q1 ~4 u8 K5 L: O  R
    // has no notion of time. In order to have it executed in
- W- m5 h, s* N, C    // time, we create a Schedule that says to use the8 |0 [9 o6 F! q" V( w- l! x5 J
    // modelActions ActionGroup at particular times.  This  A& G- d4 Q- h1 O, n9 P2 A
    // schedule has a repeat interval of 1, it will loop every1 k+ c9 `# ^0 H$ h% c0 s# N9 r
    // time step.  The action is executed at time 0 relative to
- R- G$ H6 R' E    // the beginning of the loop.6 x, I0 g; B  G7 |, B& I* [

- z2 R3 w; o9 U- c$ B    // This is a simple schedule, with only one action that is
2 X6 C2 M4 I+ ]9 G    // just repeated every time. See jmousetrap for more
& `5 ^# O7 }8 l# }    // complicated schedules.
  j$ g" B% W/ ~/ G9 R  
8 @& e" y6 ?  D& ?, g9 G  Y    modelSchedule = new ScheduleImpl (getZone (), 1);
. N  x4 e- X, w' \    modelSchedule.at$createAction (0, modelActions);2 c' P4 r  q5 c' z, B
          W* h6 b8 i' A* ^$ L9 X
    return this;
' s/ h) d, v& ?; J  }
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