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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:1 U/ B. t  d* o

6 F# A9 c$ F1 A public Object buildActions () {& K1 l" V. u8 o+ T
    super.buildActions();5 ~$ X" o" M! Y8 E3 v
   
0 J) C7 ?. h) q& ]! l" ~# B    // Create the list of simulation actions. We put these in1 a# D2 u2 h1 d( S7 h, _3 |
    // an action group, because we want these actions to be
1 t4 A6 h- t  M! J0 S    // executed in a specific order, but these steps should
' l/ r  L; D$ F. B+ p5 H$ g3 U    // take no (simulated) time. The M(foo) means "The message
9 x) R+ l. B0 a+ L/ ~, H# P    // called <foo>". You can send a message To a particular; A" }/ b) _$ L0 S& G
    // object, or ForEach object in a collection.
1 u0 i4 c4 a' z1 @$ e6 h7 a) u9 L5 o        
; ?2 ]& J& d6 w' d+ s, R) A% y' m. e( s    // Note we update the heatspace in two phases: first run0 o# e; ~& {" C/ y" J  d( L# x
    // diffusion, then run "updateWorld" to actually enact the
/ K2 @! ?- B9 ~' s    // changes the heatbugs have made. The ordering here is
- `- S' x, ~& h: n    // significant!8 K8 p$ M3 X; o1 E9 |' _
        
" t1 _0 s! @5 r8 k& ~4 A    // Note also, that with the additional
2 b* }* Q' L( k1 H0 O1 ]    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) N( M4 A7 G9 E  x    // randomize the order in which the bugs actually run
" R0 R9 ~% l- y) `% K% @( v: F8 A    // their step rule.  This has the effect of removing any; }! e& l1 E4 `3 q6 N. e
    // systematic bias in the iteration throught the heatbug& Q7 y  a* c: P0 G. B
    // list from timestep to timestep% W0 [) {+ u. L* B: W) j
        # A: r; x' y8 r! f& q
    // By default, all `createActionForEach' modelActions have& V( }6 B1 P% V  @$ G; F) z
    // a default order of `Sequential', which means that the' ^! k( I2 e% e8 i/ v" ?9 \
    // order of iteration through the `heatbugList' will be2 ?7 ^; S" k% y4 E! J
    // identical (assuming the list order is not changed; B0 x: {" K4 T
    // indirectly by some other process)./ X- G9 f0 s$ w$ N# {7 A
   
% V  o  Z; z& l7 x0 z( Z$ ~    modelActions = new ActionGroupImpl (getZone ());: T8 I# {2 @3 e) @

+ [+ E! p) h! D, j    try {
; t5 _, n; u# k: S% m, f      modelActions.createActionTo$message
, n0 g( C* n: T3 N0 V- }/ P        (heat, new Selector (heat.getClass (), "stepRule", false));
& G2 K4 _+ c- L    } catch (Exception e) {
, }2 [8 z( Z% b3 M* T      System.err.println ("Exception stepRule: " + e.getMessage ());" G: ~  U- G" y8 F% R" s4 H
    }0 ^2 A: j- P, c0 A! a

( O2 H$ F) f# r& W: u# F; g    try {
* q0 d# Z" M6 V( t: y) W6 @! }      Heatbug proto = (Heatbug) heatbugList.get (0);
& o3 b( d/ Y( w( B3 P      Selector sel =
, s3 T) C! j, W. {3 I1 U        new Selector (proto.getClass (), "heatbugStep", false);
6 h4 _/ s& x; k8 V! w      actionForEach =
  U4 f+ `7 _' Y5 ~- K  a        modelActions.createFActionForEachHomogeneous$call# y/ r( e& i/ }) R1 W) G6 s3 u
        (heatbugList,8 n# `6 [/ [* a' b9 O+ D
         new FCallImpl (this, proto, sel,
4 A: ]# c6 S% L& t3 x& o% O                        new FArgumentsImpl (this, sel)));8 p" r2 X) G$ H5 G
    } catch (Exception e) {  B7 `' `$ j8 j/ m2 o
      e.printStackTrace (System.err);  T- z$ {* `( `( S
    }/ \; c% s; c3 r5 G: E
   
' r: \# u2 F5 X. y    syncUpdateOrder ();
# `! B- @7 a; I/ t
' [  U$ B  T8 A1 ]" m1 e    try {% ^$ {5 c, i& x( \( o: V" E
      modelActions.createActionTo$message
/ m# Q" I" x' Z# C) X  I# E        (heat, new Selector (heat.getClass (), "updateLattice", false));- m7 y8 k$ @. T+ w
    } catch (Exception e) {
2 I8 {) l7 b# |! S0 H# v      System.err.println("Exception updateLattice: " + e.getMessage ());# I+ f3 |- Z# A. S7 ]% S/ O$ q
    }1 b- }1 W' e  J. o
        
$ }" K" I; b0 Q. P4 o2 ^! T    // Then we create a schedule that executes the! }) p- q( }+ v/ v0 J! M' e' S
    // modelActions. modelActions is an ActionGroup, by itself it
& b3 s  H' Y. y# v! g8 L8 g    // has no notion of time. In order to have it executed in2 \2 {& K* ]& k% Y: A
    // time, we create a Schedule that says to use the! s; |, V$ [& e1 p
    // modelActions ActionGroup at particular times.  This& z6 u! w# E& ?/ y3 j
    // schedule has a repeat interval of 1, it will loop every
. B6 H' Y7 ^3 Q1 V3 [( B    // time step.  The action is executed at time 0 relative to% Y' b* X) g8 K9 s: e; r
    // the beginning of the loop.
- A8 z' p3 K% j8 ~7 `3 {" {) x1 t) V9 L
    // This is a simple schedule, with only one action that is
7 R0 r$ w" B% m3 H- H/ e    // just repeated every time. See jmousetrap for more
8 k# A1 X- w6 r9 B    // complicated schedules.
) U7 {/ @9 l3 K" v  9 S7 v# U. F  e- B1 i
    modelSchedule = new ScheduleImpl (getZone (), 1);
8 h3 q2 U- f$ X+ L% F6 I. o( N6 W$ w    modelSchedule.at$createAction (0, modelActions);7 U4 b7 ]; w, u( `9 m
        3 l. f  Y9 ]& t+ {: E
    return this;
7 w% t3 z+ C& T! [  }
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