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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:' f# A# N8 N. k: `6 e! a( M0 [, v
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public Object buildActions () {
5 R$ r" x; ~% \; r/ p    super.buildActions();0 g; R* f' A# O# l8 m( }) l) ?4 I
    + z0 \& [  a, X% m- X' U
    // Create the list of simulation actions. We put these in
1 D7 Y) A7 O2 _4 [0 m, s5 _5 G* D    // an action group, because we want these actions to be; G& B1 m, Q, ?" n0 w$ W4 j: ^
    // executed in a specific order, but these steps should0 P4 a+ p8 }2 V- t( u. ?
    // take no (simulated) time. The M(foo) means "The message
) z' n0 Y8 }& _2 v4 V    // called <foo>". You can send a message To a particular/ c" b+ G/ [6 j
    // object, or ForEach object in a collection.( W4 F/ Q4 X' |9 S7 o5 L
        
2 z* Y: G) z  ~' B( J6 g  r    // Note we update the heatspace in two phases: first run# o, k% u) N, ^, w. J) A7 U
    // diffusion, then run "updateWorld" to actually enact the
' l' F) B6 R' f; d# N1 k    // changes the heatbugs have made. The ordering here is- y9 L- r* n6 B
    // significant!% t# M& R* J2 m( {) \- e
        
+ |. D, @$ Q- C* G) W; N    // Note also, that with the additional
3 ]- O- F% h6 s5 i8 u1 j    // `randomizeHeatbugUpdateOrder' Boolean flag we can
/ r7 v* k+ C! p6 f( u, Y+ G    // randomize the order in which the bugs actually run
) R" u" H9 x2 K. h% y$ W    // their step rule.  This has the effect of removing any3 Y( _- T4 M8 Q7 v% Y* A) J- l
    // systematic bias in the iteration throught the heatbug
  D4 i8 ?: g. s  E# w    // list from timestep to timestep9 w% K7 l- a6 t: Q2 D4 m
        ' b' B: O4 \, U4 P: R& E
    // By default, all `createActionForEach' modelActions have1 M6 [) R% W7 g) p6 E
    // a default order of `Sequential', which means that the2 r7 [! l3 W1 w& C; v' }
    // order of iteration through the `heatbugList' will be& ~/ l2 {- b. a* v
    // identical (assuming the list order is not changed& m- }. q' s$ i; {. Y2 U4 N
    // indirectly by some other process).
- k! `# }& H+ h5 S, h6 J- d    ( ?& w' N5 I& }0 V& f" K7 y. q
    modelActions = new ActionGroupImpl (getZone ());
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. E  e. I& |- _# Q    try {) g- g* k8 M% U/ M) @
      modelActions.createActionTo$message) w, n* e& g3 E
        (heat, new Selector (heat.getClass (), "stepRule", false));
; ~+ v. W$ H' @. _, v# ?& ?    } catch (Exception e) {
, f( d+ A% k3 A- E% n: S' U      System.err.println ("Exception stepRule: " + e.getMessage ());
1 {" M' B/ U' c; B4 D# g; Y    }
' q. y! m7 |/ e2 ]- s& L$ j; s  V8 R( R( J
    try {
2 I+ z) P, W+ T" Y# E      Heatbug proto = (Heatbug) heatbugList.get (0);: a. h0 p' d, V1 H
      Selector sel = 7 _% h) u2 V1 A! y4 G# R
        new Selector (proto.getClass (), "heatbugStep", false);
( B  i5 a  b) @      actionForEach =3 j" D) G( [% P1 F( \$ g$ ~5 Z
        modelActions.createFActionForEachHomogeneous$call
2 H$ A% a9 H! v# J1 }, ?# ^        (heatbugList,
8 A* k# H3 H! U2 Z* j) I% c/ _/ Y         new FCallImpl (this, proto, sel,5 E( {/ f" R# a/ K# q
                        new FArgumentsImpl (this, sel)));
1 g8 ?/ H0 @4 J/ w    } catch (Exception e) {. C/ b' D9 e! y5 m. t6 r
      e.printStackTrace (System.err);% W0 L6 L6 B; b& y
    }
+ N% C  G$ {  g  _* d7 `   
9 z+ {0 K8 }! J+ d# }    syncUpdateOrder ();$ D4 C/ ^5 P8 E
7 S/ x/ @+ z) ?. G$ a
    try {
3 g$ Q/ n9 N6 J2 p# T      modelActions.createActionTo$message
: ~! H6 ?( ?6 B- N# F% q8 F        (heat, new Selector (heat.getClass (), "updateLattice", false));# g% z- \- ^! ^1 J  J+ h
    } catch (Exception e) {$ M( c. C7 ~2 g' v! h4 |
      System.err.println("Exception updateLattice: " + e.getMessage ());9 J+ u: V: E1 Y1 g: C1 @. M1 j
    }
2 v# `2 j, ?; T# u, d- E        1 Y2 [) A8 s8 ~( l$ L+ I4 p
    // Then we create a schedule that executes the; }  P: [0 R) }& E3 d8 I( I' n
    // modelActions. modelActions is an ActionGroup, by itself it. x, f5 V) Z% E( A8 C+ K9 ?
    // has no notion of time. In order to have it executed in
, K: p7 T; g+ X7 e! C    // time, we create a Schedule that says to use the9 c5 u+ h: t7 ^$ {
    // modelActions ActionGroup at particular times.  This
% J- z' G, X& _# G# h# w/ G, B    // schedule has a repeat interval of 1, it will loop every2 O' k$ \7 N5 p6 u* F
    // time step.  The action is executed at time 0 relative to
3 j, L8 O# U2 x7 M5 ~, x    // the beginning of the loop.
7 `/ t0 L* {: S6 ]
" \5 _8 c) W% e7 A: C- @    // This is a simple schedule, with only one action that is4 m! k/ Y5 ?' J' C* `( f& b4 z# {
    // just repeated every time. See jmousetrap for more
% \& t7 u" R5 ~' ~: F4 x0 k    // complicated schedules.
0 y' i/ R+ \5 t( o8 {1 e  
* b3 j& G1 }6 M+ E/ X# h    modelSchedule = new ScheduleImpl (getZone (), 1);+ w# E  a4 c5 J7 i( ?4 g
    modelSchedule.at$createAction (0, modelActions);# h  a  `2 d8 N) x8 N# B" H
        3 B: ^' j2 W# |/ a# O- l
    return this;5 f7 i+ g# x' i$ I  @; h
  }
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