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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:
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public Object buildActions () {
) s3 A, h" L5 G8 K' W; _    super.buildActions();4 e: t4 J: U0 m3 T5 g/ j
   
# [1 E' D, D7 Y7 ^- t! f    // Create the list of simulation actions. We put these in
0 u) X6 S0 G( n, f6 D    // an action group, because we want these actions to be8 j5 _* G3 Y7 q( A8 \8 U
    // executed in a specific order, but these steps should
6 s: \8 g  s5 x0 S9 f! f* L    // take no (simulated) time. The M(foo) means "The message9 L* B) D- k7 C; A. f
    // called <foo>". You can send a message To a particular& b4 _" U# b5 O7 I( K3 M5 x) {
    // object, or ForEach object in a collection.
* J! r3 @7 e. e1 [$ B$ \4 A        7 V1 M( @  [6 K
    // Note we update the heatspace in two phases: first run' t( h! x  N0 K- f2 D+ T/ Z, T
    // diffusion, then run "updateWorld" to actually enact the2 f" D7 U" V" H% q
    // changes the heatbugs have made. The ordering here is2 ]' W9 R7 g7 S
    // significant!
$ S* \. @+ ]% R+ l        ( S! x( ?& c1 u
    // Note also, that with the additional# F9 X  N- m4 e! Q$ c# z9 U# X2 x
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
; |/ O. b& F. i    // randomize the order in which the bugs actually run
: n! W5 I3 d, e$ B; o9 ?. A7 A% {    // their step rule.  This has the effect of removing any
: t2 W: \. F9 e$ V9 `/ x    // systematic bias in the iteration throught the heatbug. \3 \! v6 A8 `$ ~. x! X
    // list from timestep to timestep
$ }* ^0 z+ e2 s5 B  ^" F        # U: F; ]- {. l- R) m
    // By default, all `createActionForEach' modelActions have" Z/ e6 A& u0 A9 k! v
    // a default order of `Sequential', which means that the! h! q5 F) ?) V* j4 O
    // order of iteration through the `heatbugList' will be
9 N3 |% k) {. F4 I* U+ _    // identical (assuming the list order is not changed" r1 O5 T9 Y4 q8 e2 K: J
    // indirectly by some other process).  X% ~9 ^- Q+ S6 L
    2 @! Z8 X$ j2 h
    modelActions = new ActionGroupImpl (getZone ());  h0 g. [/ ~3 }8 v3 p
4 Y% s/ L, h6 }2 m' _$ `
    try {/ \$ j0 P: O) }# R& }' ~
      modelActions.createActionTo$message5 h+ `3 l/ k$ R. f' a9 i- `) P
        (heat, new Selector (heat.getClass (), "stepRule", false));8 W1 \$ h6 W" H8 }9 M. {- x6 b
    } catch (Exception e) {! o! Y+ A5 O* T) j
      System.err.println ("Exception stepRule: " + e.getMessage ());
) @4 Y, P' O0 g. I    }
; G2 |$ f! G2 A7 L' t( x3 v: m% q% B& H
    try {
, L! H. Z6 y* T& {      Heatbug proto = (Heatbug) heatbugList.get (0);
: R" h: ^: l- b( d2 z, v      Selector sel = , o5 J, O+ U% \2 w3 s
        new Selector (proto.getClass (), "heatbugStep", false);8 [* Z8 K: g" B7 f  P
      actionForEach =, t- l  q. J4 i  W* g6 Z  a
        modelActions.createFActionForEachHomogeneous$call, s1 r2 ]4 V' [" b# C+ \% c  @: e
        (heatbugList,
. }% _/ D7 }1 D/ ^         new FCallImpl (this, proto, sel,/ _. l- j' T# M: R% d3 ^4 U' P
                        new FArgumentsImpl (this, sel)));0 {7 R+ |1 G  x) V' {9 C
    } catch (Exception e) {
% A' c0 l& X0 B0 |: x' [      e.printStackTrace (System.err);
& V" T) b# }) `* U2 \% G: F    }" V) h  ~# W9 L$ F, E5 }* L
    ! a, t. n: g* [+ g: x. X. ^
    syncUpdateOrder ();
, h: v- @* z! X; J/ B
. S' N: v: U% G$ i! f    try {
- o8 m5 v3 C2 \* G  W+ h      modelActions.createActionTo$message
$ p7 U/ |+ h  m% p' A# V        (heat, new Selector (heat.getClass (), "updateLattice", false));. ^' x+ r, ?1 z2 A, A% o- T- I
    } catch (Exception e) {
" A! w2 ?) c' k      System.err.println("Exception updateLattice: " + e.getMessage ());
- W. m; y8 D8 G7 _/ B) p! ^8 B+ g    }, o$ y9 a/ ]: p2 m# \1 t( M& Q
        " {2 b1 `% ^# k; F) J$ h
    // Then we create a schedule that executes the$ [1 v; p; ~) J2 z5 y7 |& N5 P1 v
    // modelActions. modelActions is an ActionGroup, by itself it' E* v9 l: G& T* Z' y
    // has no notion of time. In order to have it executed in
! ]4 M6 j' i$ W+ G+ I$ H; R1 f) ?    // time, we create a Schedule that says to use the$ k2 U: Q- C; d) u; k  a
    // modelActions ActionGroup at particular times.  This5 G* |- r! h; @8 i" i  |
    // schedule has a repeat interval of 1, it will loop every+ [- r" Z! R/ Y* p1 q; C
    // time step.  The action is executed at time 0 relative to5 ~2 o& K7 v( g
    // the beginning of the loop.
& _4 J5 f' S9 j) K% {2 b) ~" H% ]( H- N4 W& K6 i: O+ A( F
    // This is a simple schedule, with only one action that is# a/ w0 w/ w* d0 f
    // just repeated every time. See jmousetrap for more% P0 T" L) j' R2 h5 o
    // complicated schedules.4 Z1 [, {& A! i! v
  
% `8 s; F4 ~; Q, O    modelSchedule = new ScheduleImpl (getZone (), 1);6 }! i6 \. {2 X& o* X$ {
    modelSchedule.at$createAction (0, modelActions);6 N" L: q& N5 H  E
        0 E+ R4 ~- ?8 Z) V, b
    return this;% W! M1 d% q- Z7 |* F( W
  }
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