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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:0 `/ [* L" n$ Q- d5 F

( ^5 g: _7 b* P# p$ d9 O# S+ w public Object buildActions () {  q# S1 O# m% t) f7 u
    super.buildActions();
7 s3 Y9 c9 u, h9 ]# X  J' F" A   
" ^5 |* i1 r- n    // Create the list of simulation actions. We put these in1 T* M4 k, O. K6 R$ b
    // an action group, because we want these actions to be# a2 A1 [/ c" r. h6 L1 ~
    // executed in a specific order, but these steps should
5 ?( S& K; R& F& _    // take no (simulated) time. The M(foo) means "The message
# X( `5 S) c( ^- a. h+ U    // called <foo>". You can send a message To a particular% L  l, {/ y; ~4 C5 m  }
    // object, or ForEach object in a collection.6 |4 p! u+ @7 q6 ~9 p' U
        - Q* E- T) Y+ p, r0 [" d3 p/ H
    // Note we update the heatspace in two phases: first run
) a: ~) r3 Q/ H; w/ P% f4 ~0 ^' l    // diffusion, then run "updateWorld" to actually enact the
* N4 B9 u7 e; d, q$ _. z# b3 q/ I$ A    // changes the heatbugs have made. The ordering here is
, ]% r. E0 w; `7 \4 Q    // significant!) E: w3 B5 |! F5 U$ v
        " N8 x8 k# L0 W+ B3 c1 s
    // Note also, that with the additional, W7 D: Z$ k- d, n& h1 Y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can( v6 [, h' O) B9 |3 f$ I
    // randomize the order in which the bugs actually run
" s- Q0 @! O  q0 g+ L: |7 l, q& ~4 }    // their step rule.  This has the effect of removing any
6 H# E6 ?. }$ `9 u9 f0 U% U, g    // systematic bias in the iteration throught the heatbug' k& h" y) [, e- o6 [( m, b/ t
    // list from timestep to timestep% P; t1 |. a9 X- o8 Q8 y4 R2 @3 G
        
) ]; {0 O2 R: O    // By default, all `createActionForEach' modelActions have
& A0 E  p3 u- P    // a default order of `Sequential', which means that the
* @* B% U! j0 n( ^7 R    // order of iteration through the `heatbugList' will be$ ^  d( _' z) X& _
    // identical (assuming the list order is not changed1 x  k" G5 i9 }
    // indirectly by some other process).
$ u5 D( g: B  @2 b: s/ H3 n% y   
2 P2 y6 W# v4 z0 W& `    modelActions = new ActionGroupImpl (getZone ());
2 [' [/ Q0 U0 X3 t) l
* S, s$ d* d9 J. e. ~0 c    try {
% @6 k0 }) P( {7 ?      modelActions.createActionTo$message
" t: q3 E( y8 {# K% I5 m        (heat, new Selector (heat.getClass (), "stepRule", false));9 O( v. B! _8 j# R) N' f
    } catch (Exception e) {
* @# ^$ h4 p' j% \/ {      System.err.println ("Exception stepRule: " + e.getMessage ());+ O7 i" M9 H# S( i1 z( q& m8 ~
    }8 O0 l, t- V. W; o$ m' r
$ I: @* T* k# ^$ y8 D! E
    try {
' ?/ M% f% Y  U1 _9 M      Heatbug proto = (Heatbug) heatbugList.get (0);# o2 f4 ?3 ]" X. L/ ^) D2 s
      Selector sel = / L  @% x" q; K
        new Selector (proto.getClass (), "heatbugStep", false);
. b, X0 C4 p! p$ [      actionForEach =
# \' n& ?8 Z! @3 C  e        modelActions.createFActionForEachHomogeneous$call
' ^5 M- j1 X4 }. H7 L        (heatbugList,
, f! ?& `' h' ?. [         new FCallImpl (this, proto, sel,
, p, ?3 d4 n! ~5 \, L" z0 L                        new FArgumentsImpl (this, sel)));
; e- Z3 R/ i! d5 h    } catch (Exception e) {( z: p/ k9 F5 f
      e.printStackTrace (System.err);$ R/ N: T# m+ ]: D( s
    }
* P2 {1 v% X5 k7 s- _# M   
; z5 L% A6 w& Y" L" Y. Q: B& r# A    syncUpdateOrder ();/ w' [9 r  ~$ o3 {7 j

8 _9 M, ?6 R* H    try {
) @/ {2 [9 j* [$ {* X5 \% l9 \( s5 T$ G      modelActions.createActionTo$message 5 ~. K! Y7 z& ?; p+ |$ Q) M3 ^
        (heat, new Selector (heat.getClass (), "updateLattice", false));. V& _; ^; f# ?! {  j
    } catch (Exception e) {
7 @: {, q- W( }      System.err.println("Exception updateLattice: " + e.getMessage ());7 N: {  `/ D) U4 f, Q/ E( Q3 {
    }
/ j0 J7 ^& q5 _        , Y) U8 j* t+ a) L
    // Then we create a schedule that executes the( q: U4 a& s; {* B: s* U7 `3 I! x
    // modelActions. modelActions is an ActionGroup, by itself it
% R7 H) K# G0 S" ?% U# d2 T1 b    // has no notion of time. In order to have it executed in& x8 t; J0 Q! K! V; J
    // time, we create a Schedule that says to use the1 s* {! i* {! R1 }" N$ ~; S
    // modelActions ActionGroup at particular times.  This
* K/ C9 k7 u+ D( F* k  w    // schedule has a repeat interval of 1, it will loop every
9 m! K9 I' G2 b( J  \    // time step.  The action is executed at time 0 relative to
" @: a6 R" \0 Y    // the beginning of the loop.
' u1 F3 l. L( A9 r5 Z/ y' G' I' o1 F/ s. N! O+ B, _1 m4 c; k" a0 z: N
    // This is a simple schedule, with only one action that is
$ k/ R9 `5 P% |( b    // just repeated every time. See jmousetrap for more
4 k4 K( c" K3 \; D+ K  v    // complicated schedules.' r! L. o) g+ @
  
3 _9 |) {% R3 O    modelSchedule = new ScheduleImpl (getZone (), 1);* G+ u7 r; j6 T1 g5 {1 t- _0 [$ j
    modelSchedule.at$createAction (0, modelActions);
9 y  G/ z5 s6 f3 Q+ O        3 I# t$ p  q" P1 u- B* C0 R: u2 X
    return this;9 |1 ?" A7 P8 |7 _+ L% F
  }
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