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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:
2 ^+ i7 G$ Z" O4 ?
2 {# @4 f  b8 A; R( V2 T7 O  a public Object buildActions () {' S/ P7 e# i  _. l, {$ S" S
    super.buildActions();
4 J: \3 M% }8 {2 w' b   
. }+ M0 V- u" \( _1 P+ P    // Create the list of simulation actions. We put these in
* M7 v/ _/ Q: g! E    // an action group, because we want these actions to be
1 O' x9 K$ Q7 l/ J  u- m    // executed in a specific order, but these steps should  Z0 U7 D4 j/ C1 P" `0 |
    // take no (simulated) time. The M(foo) means "The message
% Z$ a- l/ l4 q7 I' T7 `! ^" A    // called <foo>". You can send a message To a particular- b! H* N: T5 [. T, s( M
    // object, or ForEach object in a collection.. O% _4 L" H' M/ k8 N- }
        , [1 L' A' ?: u
    // Note we update the heatspace in two phases: first run
$ y# v1 E, I) Y* W3 r    // diffusion, then run "updateWorld" to actually enact the9 P0 A" {  L6 d3 k+ ~
    // changes the heatbugs have made. The ordering here is
+ X" N5 ~4 E# c1 j    // significant!& a4 P& n, N9 ~4 D
        
2 k) {' O/ @# ?4 \0 ~    // Note also, that with the additional  ~3 g8 \: m( j0 g. s
    // `randomizeHeatbugUpdateOrder' Boolean flag we can7 L% B0 h# p) m4 ]. H- P
    // randomize the order in which the bugs actually run" S3 M7 ~; g, b
    // their step rule.  This has the effect of removing any$ |' ^* k% a) B3 J/ ]
    // systematic bias in the iteration throught the heatbug
0 R6 T2 x# c/ X4 w) V2 j; {    // list from timestep to timestep. |% X& K# [) h0 a- {
        4 H8 ?. ~) W6 L# e6 z; X% x
    // By default, all `createActionForEach' modelActions have" _; B9 X/ y2 b9 H( X
    // a default order of `Sequential', which means that the
1 ]" j1 x7 ?. k$ a* n' d    // order of iteration through the `heatbugList' will be
( H3 M: b  s, R- ^( e3 Q    // identical (assuming the list order is not changed0 I$ ^& D) F* [/ n/ k3 h6 q
    // indirectly by some other process).: }1 c9 K! A  @6 |6 d' ]" R
   
0 |0 v: r3 i; b" Y# A    modelActions = new ActionGroupImpl (getZone ());
' V' S) t9 U/ j, Z5 n5 _( T3 a
3 ?2 e1 O. m, l8 w6 w3 n    try {$ ^6 M6 g. \- s/ h& T/ x
      modelActions.createActionTo$message
' Y% ?* s7 X. ~/ S9 Z        (heat, new Selector (heat.getClass (), "stepRule", false));/ w% {6 a! V$ x$ v5 V! }3 {
    } catch (Exception e) {" a2 x* {2 q( |  n* i  q% e
      System.err.println ("Exception stepRule: " + e.getMessage ());: t$ ]# v4 u/ |/ X% T
    }, c4 j; c; B5 e4 M

0 H2 t6 g! _8 v1 l7 d1 i# j    try {
1 z3 ]8 s9 b) m1 a5 @$ o* {1 Y5 G: m      Heatbug proto = (Heatbug) heatbugList.get (0);' b: ], g: J2 K
      Selector sel = " y/ C1 ?% |* }
        new Selector (proto.getClass (), "heatbugStep", false);5 D$ a. {# P8 t2 O4 ^5 i- \
      actionForEach =
! i: A% D; Z7 h2 u1 B        modelActions.createFActionForEachHomogeneous$call; K! @- c2 d5 _9 g$ s
        (heatbugList,
. n. Z# b1 I5 r         new FCallImpl (this, proto, sel,; z/ G: G& b" i. B2 n, y& V# o
                        new FArgumentsImpl (this, sel)));
- F7 i3 c/ l8 c; G    } catch (Exception e) {8 O3 c+ C3 }6 Q0 x& H
      e.printStackTrace (System.err);
+ t9 E" v/ N' m0 k( L' f    }
0 |, j% k  t2 [0 Y2 F   
) B/ T" K3 u) T, i$ t1 y3 p) J    syncUpdateOrder ();" ]2 m1 Q+ c. P- z
) h7 F! J' i5 o, f. h+ u
    try {/ r/ `$ }" i  f
      modelActions.createActionTo$message 5 D( x" E- f% S
        (heat, new Selector (heat.getClass (), "updateLattice", false));
: F, f- ?& N3 f3 t1 K    } catch (Exception e) {4 a; ~; J( N6 J5 ]
      System.err.println("Exception updateLattice: " + e.getMessage ());
) j# {5 k8 E8 X- f% ]    }3 A3 a( q* |5 T) ^  M
          L7 }! G# O7 g5 G/ R+ `7 i
    // Then we create a schedule that executes the7 d9 Q& M3 P  F$ M  V
    // modelActions. modelActions is an ActionGroup, by itself it
" w3 d- F% R; E! ~; F' R& o    // has no notion of time. In order to have it executed in3 g* A5 K8 Y; {6 e
    // time, we create a Schedule that says to use the
& K# n, u% b% s    // modelActions ActionGroup at particular times.  This
9 z3 Z5 |$ y& ^# B    // schedule has a repeat interval of 1, it will loop every
% u5 c) E$ q& `! J    // time step.  The action is executed at time 0 relative to
: @8 r$ N- p% q8 Q    // the beginning of the loop.
5 R# e& v: b( o0 J9 a6 W, n6 P$ Q& k6 V; e! m( r8 M0 C1 ?6 A
    // This is a simple schedule, with only one action that is
. O- v% p1 ^1 J/ ]    // just repeated every time. See jmousetrap for more$ L0 D5 C7 K& o& K, D/ R
    // complicated schedules.
) J# N  r0 ^% ?4 Q7 b# G/ y2 t/ _  7 A5 @5 Q( v8 S" m6 F) Z
    modelSchedule = new ScheduleImpl (getZone (), 1);  ^6 G: j* u3 A5 r
    modelSchedule.at$createAction (0, modelActions);
' k, w/ l, p0 `1 N- g$ q7 S# [        
4 h' v8 W/ m3 Q' P% ~' t    return this;6 S8 L' J6 @0 q# L4 }! l2 k
  }
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