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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:
% U4 A9 U( n% t5 c6 J* ^
0 c* n! Y, Y& \6 e* |, u public Object buildActions () {
4 ^+ A( B  R  c4 F    super.buildActions();6 n8 j" w5 z; G
    0 {9 S0 H$ ]7 V1 q2 F
    // Create the list of simulation actions. We put these in
4 \  |' }8 ?2 s+ J/ `0 r$ U" X    // an action group, because we want these actions to be
; [' f1 I4 A+ K" D+ j    // executed in a specific order, but these steps should
* ~2 ?5 t; u' A! n/ F! s    // take no (simulated) time. The M(foo) means "The message
2 ^$ D4 K1 ?4 Z# |6 w1 b+ S    // called <foo>". You can send a message To a particular
1 Q9 p. h& Y" Z* V5 U    // object, or ForEach object in a collection.
, o" o/ P6 e+ v! X; P8 y, e0 B        
$ {1 ?' `& E% e* r    // Note we update the heatspace in two phases: first run7 K6 `, e* O( e1 B  [
    // diffusion, then run "updateWorld" to actually enact the
2 q4 }' c! Y8 |+ I; R( w/ f    // changes the heatbugs have made. The ordering here is
5 P- w3 n. ]& D2 W: P& w2 [    // significant!
7 b. q" E* g( H3 b        
: n2 p$ P% y& m+ |( t: d" }    // Note also, that with the additional% A: X3 V: U0 }
    // `randomizeHeatbugUpdateOrder' Boolean flag we can* P, @* b( Q0 w1 a& B
    // randomize the order in which the bugs actually run9 E. Q. h" z# j0 A1 z
    // their step rule.  This has the effect of removing any
2 S" L) ]. I$ ?* P0 U    // systematic bias in the iteration throught the heatbug- i# |2 B% b( R8 w: E9 H$ Z# V% U! x
    // list from timestep to timestep
" M7 I$ t' I4 g0 K' g        
9 l  E+ r3 B! u9 D) I    // By default, all `createActionForEach' modelActions have9 \3 `  D5 C/ f" N  l; I
    // a default order of `Sequential', which means that the4 L2 M8 c5 F2 L* S0 p
    // order of iteration through the `heatbugList' will be
' }) C7 b, H* ?  P    // identical (assuming the list order is not changed
+ a" a3 @( a; _! s: M    // indirectly by some other process).
' r$ T, {  q$ _" D1 A   
( T/ {- O2 d+ w% Z    modelActions = new ActionGroupImpl (getZone ());
; z" j* r% q& X- l& v
  K' e/ Z) @8 W" g$ ~$ t! S- d5 X    try {
( Z, w3 U" h* m# d/ g$ B5 v      modelActions.createActionTo$message
1 P" e! w& \- o" o& ?7 I! F        (heat, new Selector (heat.getClass (), "stepRule", false));0 X5 @) z$ ^% w. j1 A2 J
    } catch (Exception e) {. k) p4 ^+ A1 n4 C  c
      System.err.println ("Exception stepRule: " + e.getMessage ());/ {) e' ^1 s& X: v/ w
    }
5 n6 o2 p$ l8 L. e9 B; ~0 p- l# E: }( ^0 i& [
    try {. X- z/ e, M, v0 ^6 W! ?* S
      Heatbug proto = (Heatbug) heatbugList.get (0);
# N  @. A! a$ }- G+ v$ F0 C8 P      Selector sel = / X# ]! ]3 a$ e# o' k' z
        new Selector (proto.getClass (), "heatbugStep", false);7 H* A. D8 ?$ v2 [5 {8 e
      actionForEach =4 {0 e* H  B1 O8 e5 O( S
        modelActions.createFActionForEachHomogeneous$call6 R9 G& N9 s2 g4 K3 d9 [
        (heatbugList,
$ K) ?4 e3 [) A( F& C! _         new FCallImpl (this, proto, sel,
1 V  c" b: I1 D5 q8 X5 E                        new FArgumentsImpl (this, sel)));3 q- D  q3 p2 ?' J9 b, ?3 ]
    } catch (Exception e) {! O6 |" ^7 \, v/ w- l
      e.printStackTrace (System.err);+ V: X$ w$ k# y5 D4 h( @7 M: y
    }( ^' w9 m: S, x) h" T1 {" I
    % f* W4 N7 S- L% Q8 S+ U
    syncUpdateOrder ();
, Z7 G) c3 D  x4 g' y. W/ ^0 p5 g
1 ~  u4 x6 J9 d0 Q    try {
- C' x$ U3 U8 \" g      modelActions.createActionTo$message
* ^! ^& Q# F2 a) a& {        (heat, new Selector (heat.getClass (), "updateLattice", false));$ t# Z1 v% \  n# `. v
    } catch (Exception e) {
! B" d" Y5 u. N' l      System.err.println("Exception updateLattice: " + e.getMessage ());
4 F* q4 B  U8 {% v$ I1 W- N    }
. z$ ~! X6 `# i) j        . q$ }3 p, A3 y
    // Then we create a schedule that executes the2 J  N2 q7 Y1 t6 Y$ h8 ]. V
    // modelActions. modelActions is an ActionGroup, by itself it- d  v/ B5 L0 x- G' e- w
    // has no notion of time. In order to have it executed in
# T5 n& h3 C7 F. _4 B    // time, we create a Schedule that says to use the
' ]3 F) Q+ n3 r. f) Q    // modelActions ActionGroup at particular times.  This) ], U& C9 ~, P5 B! _$ b
    // schedule has a repeat interval of 1, it will loop every
, U1 h& b, F* E' f    // time step.  The action is executed at time 0 relative to
, U% U- U4 ~* C& K8 b# a    // the beginning of the loop.
1 ~/ @, J( g; N9 _9 I2 ?
/ L9 {6 x; l- M1 Q    // This is a simple schedule, with only one action that is
0 T4 R" a' C) L4 B) i    // just repeated every time. See jmousetrap for more
9 h" A: c$ x6 I+ E' \+ c8 Q    // complicated schedules.) k2 P( N9 A/ j* ?, N9 @
  ; j4 s4 _' h3 L* N- w( c& |
    modelSchedule = new ScheduleImpl (getZone (), 1);( T% d" o  g6 ]( a, b
    modelSchedule.at$createAction (0, modelActions);
0 u# G" A7 y7 L- c% o! d        ( _; N9 N" P: k- t- x# t
    return this;
: P9 R0 ~3 V1 ?- C  }
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