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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:% Y7 ~* j) g& g3 I

* s3 [% }2 n4 d. J) Z public Object buildActions () {' b$ X! ?" p8 ?- I8 T) Q0 m+ X0 y
    super.buildActions();
  w- M9 i: M$ V4 v! f   
* \4 a- e5 s3 D    // Create the list of simulation actions. We put these in5 F. b  h  A6 E8 D9 x$ v" b" I* |
    // an action group, because we want these actions to be7 f7 G1 D, S( a0 Y6 j
    // executed in a specific order, but these steps should
# T5 e( p* m1 p. A, ?1 i    // take no (simulated) time. The M(foo) means "The message/ k4 i! E( F/ w/ ~
    // called <foo>". You can send a message To a particular
8 j7 j( a7 ]: }3 _% |* w    // object, or ForEach object in a collection.
. e5 y1 y3 i- t( |  H( m        $ R( D( n4 f3 H! w! y
    // Note we update the heatspace in two phases: first run
( B/ g" [5 x. H  l* W    // diffusion, then run "updateWorld" to actually enact the
' {: I* M0 H" L: q3 O& C. r    // changes the heatbugs have made. The ordering here is: v6 o1 L& z: W; X% [0 l
    // significant!
) e5 Z( y7 m0 N8 s        
( j- K7 E( G6 j+ d    // Note also, that with the additional+ j* N% B+ S* u0 G* P) ]/ s7 J
    // `randomizeHeatbugUpdateOrder' Boolean flag we can" V+ m2 ~( m9 X* X  o8 o$ f& R. N
    // randomize the order in which the bugs actually run/ {1 f4 Z# g7 z
    // their step rule.  This has the effect of removing any; J! l* J1 a" b& n% g  m
    // systematic bias in the iteration throught the heatbug
2 ~, n8 ?; ?/ b/ F    // list from timestep to timestep
& W( g0 H# ]3 D        * J. G& Y2 D& \5 X# G
    // By default, all `createActionForEach' modelActions have
) b8 [; F2 ^9 F    // a default order of `Sequential', which means that the
2 _  Y9 z) x, W/ _    // order of iteration through the `heatbugList' will be
9 i$ W# b7 Q, J/ l    // identical (assuming the list order is not changed
2 v+ d; w# u( b6 |9 Y4 l    // indirectly by some other process).) Z1 R; b' r, `: j! t& x
   
4 ?. F5 r% T8 q+ }, ?2 ^& S- B0 h    modelActions = new ActionGroupImpl (getZone ());
9 K2 d; R- W" f4 m  K& V! T& C! j# @. t* D' J1 U
    try {+ ~- O, S% M7 H" e$ G$ N2 I
      modelActions.createActionTo$message
  j; G/ P) z* {        (heat, new Selector (heat.getClass (), "stepRule", false));
2 k. ~7 f' d8 p& V" k9 X    } catch (Exception e) {% G) l" j" V/ Q* A
      System.err.println ("Exception stepRule: " + e.getMessage ());7 n/ O  M9 [8 P& }8 Z; P9 s
    }
( w! q$ @# Y/ F& l- F' ]+ f0 e6 ]: R& u% e$ c
    try {" M: v* Y' |+ }$ o" S1 {
      Heatbug proto = (Heatbug) heatbugList.get (0);
" ~) N: l1 v, a      Selector sel =
. a# Q- j* s2 ?( S* U        new Selector (proto.getClass (), "heatbugStep", false);
4 T! I7 [$ _8 y4 k6 E      actionForEach =1 m  V* L4 z9 a0 b
        modelActions.createFActionForEachHomogeneous$call
4 D: i# i. g$ h/ T3 k/ |) Z' A) @        (heatbugList,0 O: G/ F4 F3 S1 F" L
         new FCallImpl (this, proto, sel,
+ b8 Y+ \1 X& S" h. [                        new FArgumentsImpl (this, sel)));
. x2 l& M8 d4 k( k5 Q. V' U$ Z    } catch (Exception e) {: T. Z* X/ k; D" J+ f
      e.printStackTrace (System.err);: T9 \. ?8 U6 C. i, b& P6 H$ ]
    }
6 E8 Z9 f( ?/ Z3 P/ G0 ~    ; B. [( @, K/ h4 x9 [* ]
    syncUpdateOrder ();1 }1 s* N( D( o

1 k' ~: i8 h# f0 p% E3 c    try {" ?( e# _  x2 N" u: d& _& N
      modelActions.createActionTo$message 7 C7 T& E: |& g% a8 I7 a
        (heat, new Selector (heat.getClass (), "updateLattice", false));
+ i" d5 u1 p5 O8 {: ?    } catch (Exception e) {, J0 z3 `/ O4 g9 b& Z5 L
      System.err.println("Exception updateLattice: " + e.getMessage ());
1 k$ B0 g( Q1 _& R3 \# t    }
7 u( C: z" p3 P* {+ j9 R5 F        
/ S1 m1 U8 S' \2 a6 v) M    // Then we create a schedule that executes the! a! e& U" q+ |$ m" S7 P" Z
    // modelActions. modelActions is an ActionGroup, by itself it
* [( l" }( v% v' i/ ~& E    // has no notion of time. In order to have it executed in2 ^! ^( e, t/ \% D- \) D
    // time, we create a Schedule that says to use the) U* G, f9 a$ H4 ]% O9 Y4 U3 p; j# {
    // modelActions ActionGroup at particular times.  This; F+ C& Y  g) t
    // schedule has a repeat interval of 1, it will loop every# y* @" @7 a  u9 G$ `0 _/ C
    // time step.  The action is executed at time 0 relative to
$ G. h5 P4 y4 q/ W1 \    // the beginning of the loop.# m( F# [7 t8 [" Z7 W3 Z3 f1 A, K. H
8 @" X4 i$ \9 ?7 S
    // This is a simple schedule, with only one action that is1 M2 v# _% y6 L, A4 o1 B
    // just repeated every time. See jmousetrap for more# l9 }; S6 `" D1 r2 F( O
    // complicated schedules.+ ~' c$ Y' F. i5 t
  
& K* e4 A; E5 R    modelSchedule = new ScheduleImpl (getZone (), 1);
. V$ M# W1 n1 Y7 r$ J6 {! X    modelSchedule.at$createAction (0, modelActions);
  o5 k+ A. k2 R        - }- |3 o. V* _( b5 e5 D6 V) v
    return this;
; W( T: e/ p8 @* O# Y  ^  }
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