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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:6 @5 o* j9 E) g3 R
4 ~5 w; H* @, X1 D* c! ?# h0 K
public Object buildActions () {
! A" h" Y, }3 x. q: m7 ^1 [    super.buildActions();
" n! o2 G8 R1 Q7 ^" F    ( m8 ]1 @2 n5 v1 {4 K0 s% Z9 ^
    // Create the list of simulation actions. We put these in
" L& B4 F+ {/ }; O    // an action group, because we want these actions to be
% r1 k, w( r$ ?5 \) t) |    // executed in a specific order, but these steps should
$ e+ E8 C. B4 {9 d  E    // take no (simulated) time. The M(foo) means "The message5 t9 S2 U; o- G& q( N9 ~; d
    // called <foo>". You can send a message To a particular
; ]" D; V: X8 \    // object, or ForEach object in a collection.- p& x. U% p0 J
        7 M: P6 K' t0 [2 K- w5 F. ~, r: |7 H
    // Note we update the heatspace in two phases: first run! U$ J+ T5 b' ~; y# }7 _4 H
    // diffusion, then run "updateWorld" to actually enact the
0 o/ O: @) I5 z  n' L    // changes the heatbugs have made. The ordering here is: Q1 u- }# I' c9 n  o
    // significant!
- `; v6 Z2 ^# Y7 n+ V        ! A8 x! @( Y' u5 t4 u$ c
    // Note also, that with the additional
0 ]% w( f% i1 d( V% ^  ^    // `randomizeHeatbugUpdateOrder' Boolean flag we can8 f$ |" w) w- p) {; h& C
    // randomize the order in which the bugs actually run
* f$ }% ?3 J3 y$ i2 F$ B& a( t1 v# f    // their step rule.  This has the effect of removing any  o/ G0 S2 t3 X4 C( d3 R/ |. d% S
    // systematic bias in the iteration throught the heatbug$ Y& b3 ?4 n- g% R7 q
    // list from timestep to timestep% Q( t$ u, f; l- Q" e
          I0 f5 r$ G: d. D4 d
    // By default, all `createActionForEach' modelActions have
' ]# T. x% x6 Y0 X; ~    // a default order of `Sequential', which means that the) V# H4 f& i/ {( d' p. F6 X
    // order of iteration through the `heatbugList' will be+ w8 b2 @, R$ x) `# U
    // identical (assuming the list order is not changed7 \, l* G7 j' ~* ]2 Z3 B. p* K  g
    // indirectly by some other process).
' T) @- |0 r8 ^+ U- ?, g% t   
- H8 o6 n/ q4 _4 J7 U2 [1 p    modelActions = new ActionGroupImpl (getZone ());' `& N; |+ `; M, x2 U6 }
: s7 {( e* D2 q( E# D+ T
    try {
# L- w. B7 N8 y0 w      modelActions.createActionTo$message  C$ Z8 L: ^" N4 }. p& X3 G
        (heat, new Selector (heat.getClass (), "stepRule", false));' @) u4 w4 U, F. r5 x
    } catch (Exception e) {, Y! ?/ P, G) L2 Z1 N% _3 h
      System.err.println ("Exception stepRule: " + e.getMessage ());
+ T( _8 d' Z- d    }
$ t1 P1 Q& _/ q4 i& a+ J
& Z6 H/ F4 F6 s! k2 l    try {
! c% R  ^7 K% w2 c      Heatbug proto = (Heatbug) heatbugList.get (0);
' ]3 }# Y8 Z" r) c9 _      Selector sel = 0 G8 g* u1 [0 U3 V* t0 d3 |
        new Selector (proto.getClass (), "heatbugStep", false);
- W/ U1 A' a. C& {      actionForEach =  e9 d! e$ W- n
        modelActions.createFActionForEachHomogeneous$call6 w0 d+ H6 p% e9 E  s& f- l
        (heatbugList,4 i$ f7 ?( |7 d6 S$ I/ ^2 p9 J2 w
         new FCallImpl (this, proto, sel,* l, |3 m; Q8 `5 [
                        new FArgumentsImpl (this, sel)));2 O- N5 d6 J0 o; m
    } catch (Exception e) {
* D$ V$ L; G- u      e.printStackTrace (System.err);
' n$ M9 M- H8 T* Z    }
  ~3 u7 h7 Y5 R) d0 e2 i    , T4 h# Q9 I# d# T
    syncUpdateOrder ();
4 n  [/ f" A& R* L- K9 \1 ]7 G- V9 h: Y4 }! H7 V6 `; ^2 F7 x
    try {9 e9 j) ?, u) {5 C( j) `
      modelActions.createActionTo$message 1 b4 x2 T' j! p% H" Q
        (heat, new Selector (heat.getClass (), "updateLattice", false));1 ?" m& O  g5 A+ r
    } catch (Exception e) {
3 o4 O% q3 ]5 [3 [      System.err.println("Exception updateLattice: " + e.getMessage ());, l6 y$ j- z# q# i8 `
    }# V+ I; O; N& e: m& j& A
        : H# G% i5 x' J3 h9 |
    // Then we create a schedule that executes the
, Y1 U) }; }5 L2 S1 E    // modelActions. modelActions is an ActionGroup, by itself it
4 {& o5 t, v; [) O; c& c: t8 A  }  I    // has no notion of time. In order to have it executed in
7 E1 ?$ C/ Z- }6 A$ U    // time, we create a Schedule that says to use the
7 }" ]! X6 f; v' f0 @# s% |    // modelActions ActionGroup at particular times.  This
4 G' u$ E0 c# R# Q    // schedule has a repeat interval of 1, it will loop every
+ r- ~/ y$ C. ~5 B1 B    // time step.  The action is executed at time 0 relative to
- I- U/ N- k) c4 y+ r    // the beginning of the loop.
1 i$ A% ]# d% c5 X8 R, o% P
" H. R! J0 d3 V% `  Z    // This is a simple schedule, with only one action that is* K* q4 m) N' J7 N3 @& N
    // just repeated every time. See jmousetrap for more
: x- h( U$ p: k, @, m    // complicated schedules.
. z2 W7 G8 J/ x  
1 \! w$ w$ t$ f5 _  E0 v. Q    modelSchedule = new ScheduleImpl (getZone (), 1);- f( ?' \. g7 Y- Q2 W- f0 u$ K, Y
    modelSchedule.at$createAction (0, modelActions);
% S' X* b0 u1 r; o* B& y6 f        
8 y4 B$ E8 {6 c: v  w! a; j6 r    return this;" U4 Y/ E6 {9 \8 O/ I
  }
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