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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:3 N" K2 y; B$ E

; g( T8 l; p, X% @ public Object buildActions () {/ [, X1 a9 P' U) D, l$ E
    super.buildActions();
: B; T* l9 v& n7 P$ _, C" v, \9 m    ' U/ c4 e/ |/ P+ z
    // Create the list of simulation actions. We put these in
( y+ ~3 o' [: l    // an action group, because we want these actions to be9 [' r6 o) A; n
    // executed in a specific order, but these steps should0 [* J4 Y# u6 a' A8 n
    // take no (simulated) time. The M(foo) means "The message6 K0 Z7 Q9 L* O6 ?; E& j
    // called <foo>". You can send a message To a particular
" J+ H" m% L+ M8 _) [7 u    // object, or ForEach object in a collection.
: q: s9 T( V( j* o6 J        
# U  E' g$ Q( ]) K) H    // Note we update the heatspace in two phases: first run
/ U" r$ V5 B( ]0 G2 {; w    // diffusion, then run "updateWorld" to actually enact the% d, H. r5 i7 R; X6 o; Y
    // changes the heatbugs have made. The ordering here is
  _2 L9 Y7 T) _! Z6 S4 R: P! x2 {    // significant!4 t& c# t, E" K
        
6 A2 h% ~. V. ?, d* |; J    // Note also, that with the additional, L% t0 F7 u  d  C- X- i: Z
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
7 N  c; U1 o7 o& m6 k) p% p8 u    // randomize the order in which the bugs actually run# H6 C7 j  ]4 d1 H. N9 l, W
    // their step rule.  This has the effect of removing any
2 C7 ]' h% a( ~6 [4 J1 N) b    // systematic bias in the iteration throught the heatbug
4 c! C$ i& L5 \1 a" o( C: _    // list from timestep to timestep# U1 O) V; n, T( ~* w1 U7 M4 [
        + h# v' Y  ^3 u4 z# j+ ?
    // By default, all `createActionForEach' modelActions have
/ |: _9 U1 z! S9 Z9 s% Y    // a default order of `Sequential', which means that the6 ^1 M) z/ g# @: L
    // order of iteration through the `heatbugList' will be9 X* Y0 a) N  U4 L/ A# H
    // identical (assuming the list order is not changed
! p2 A6 e) R; Z: D% j, }    // indirectly by some other process).9 b) e0 P6 w& c( Y/ F
   
6 K$ F% N+ ~8 n    modelActions = new ActionGroupImpl (getZone ());
- P9 m& E" d1 N, Q- e4 V8 S
. u& G1 ~+ [1 c+ l- z" C    try {
0 O- O& {: c% ?: D      modelActions.createActionTo$message1 p& C: |$ W$ T- R) M- C$ b/ l) Y- A) ^
        (heat, new Selector (heat.getClass (), "stepRule", false));
& X' J5 J5 @! k    } catch (Exception e) {
( {8 b" j9 G0 a7 _      System.err.println ("Exception stepRule: " + e.getMessage ());, [' @8 a% b& G. u$ i6 Y
    }
# o' W2 `- v, [8 P0 {% q- ]" k/ y
, b( M( H. ]0 ], ?    try {
& {  C. x8 Y( P- B& h, U6 Q      Heatbug proto = (Heatbug) heatbugList.get (0);
$ G+ _; b7 P/ |, i      Selector sel = 2 A. }& _# I4 T2 m! v2 W! m
        new Selector (proto.getClass (), "heatbugStep", false);" g9 @. I7 c( S! K" ?6 I( M
      actionForEach =$ w; S% n& B* v& {  B: ]
        modelActions.createFActionForEachHomogeneous$call0 Q+ E, W2 P# I, H9 M/ q3 O" t
        (heatbugList,
: r: `0 v0 _% R' f# b  ?         new FCallImpl (this, proto, sel,
8 R* d/ Q6 T) v* F; a/ g; J                        new FArgumentsImpl (this, sel)));
. ~3 i5 y3 z$ b4 u8 U    } catch (Exception e) {
+ O7 c* \* c4 u) v  U3 E      e.printStackTrace (System.err);: y4 j( u; r' U5 d# U# q" C
    }
! W/ @/ V' o: j7 _. Y8 b! ~   
9 q' o. g" p. u3 \, c5 _9 l    syncUpdateOrder ();
$ V& j! N, f4 K; b. Q3 R
$ Z* v; g7 e: X2 v4 _    try {
' l* N2 ^* ]( Y5 Y  ]- X9 h0 ^  B      modelActions.createActionTo$message
+ U) I# u2 _$ P% c& K; H        (heat, new Selector (heat.getClass (), "updateLattice", false));
4 n- k. o# ]9 W1 e; t    } catch (Exception e) {
# ]( @3 v* \  s  {* ?& L      System.err.println("Exception updateLattice: " + e.getMessage ());5 D; _) \; w# \. n$ i% f9 M8 A' Q
    }6 L. ?0 l# h7 K0 h
        
, z2 ]0 W, J) D  M3 m! W! P' d    // Then we create a schedule that executes the4 S, ~5 `$ ]- q* ?; f8 U3 Q# e
    // modelActions. modelActions is an ActionGroup, by itself it
$ Y7 Y* j! ]+ h) P; j    // has no notion of time. In order to have it executed in. `! |- V1 Z* s0 a& \
    // time, we create a Schedule that says to use the
( s* L/ a0 [! u, l$ m    // modelActions ActionGroup at particular times.  This5 C1 O; O0 N3 [: `$ B$ }
    // schedule has a repeat interval of 1, it will loop every
# P- h( H9 \9 k" ?* o, F/ ^    // time step.  The action is executed at time 0 relative to
% r) J1 i' `% u6 u% N    // the beginning of the loop.
+ y+ L' J* i7 s& M9 w  ^; T1 [8 q7 L0 Z3 y
    // This is a simple schedule, with only one action that is
% L* U3 {1 c0 n) ^9 m# u    // just repeated every time. See jmousetrap for more
+ s" Q# V! y- a' V9 ?    // complicated schedules.
; j' X+ ~) w; H4 r& A; M# q  8 P. h/ `) t- v! z7 I2 T
    modelSchedule = new ScheduleImpl (getZone (), 1);
0 W/ m* t3 k- u    modelSchedule.at$createAction (0, modelActions);8 l7 w5 X/ _$ ?
        ) v9 j9 z) {; e. K( q& [
    return this;; V3 P: j. {9 |8 z0 x' y
  }
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