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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:  l! c0 B6 Q$ K8 J9 a% h: T
" D& n9 Q8 }8 c+ l! n! A# C: D+ o4 c
public Object buildActions () {2 Z  B, ?7 h0 \/ k, l
    super.buildActions();
  p2 H7 }# F, W9 |6 S% R. t9 X   
4 I0 D. x7 O: ~; N  U    // Create the list of simulation actions. We put these in
7 B6 ^& t5 Y2 u4 T% L( u7 X" }    // an action group, because we want these actions to be
( J- g5 m+ b. O8 w    // executed in a specific order, but these steps should
4 {7 X+ b" v" X* U/ ~/ E, a    // take no (simulated) time. The M(foo) means "The message* A2 H3 e( y! q9 O
    // called <foo>". You can send a message To a particular6 j+ E9 ~2 j7 {' ]
    // object, or ForEach object in a collection.+ C- E# w% {( l) S! a! n( R$ c
        6 s! k. d1 ~: J* g  t
    // Note we update the heatspace in two phases: first run
) I: M" ]8 g* J: A    // diffusion, then run "updateWorld" to actually enact the
; K2 D! y2 f( ?& r9 h* a3 g* @* e    // changes the heatbugs have made. The ordering here is8 y$ G3 k5 S/ ?
    // significant!
+ x1 R+ m2 H, Q6 a  k. V2 a- X8 l        * v5 A1 K( }  ~& {
    // Note also, that with the additional
5 [1 v: v/ w# `    // `randomizeHeatbugUpdateOrder' Boolean flag we can4 {6 Y3 l2 ~6 v2 g
    // randomize the order in which the bugs actually run9 A: w$ g/ ]9 ?5 Y0 \% _3 P
    // their step rule.  This has the effect of removing any; j7 H, t8 l$ I  m, X, L
    // systematic bias in the iteration throught the heatbug# h3 W' m0 W1 [( C+ k; L1 c5 {" @& y' n
    // list from timestep to timestep
- @) W& ]9 s* [8 C1 I" {% F' d        * ^' Y& q/ n" |! ]# a! t
    // By default, all `createActionForEach' modelActions have
. [  b5 K+ J% L2 M/ u" M    // a default order of `Sequential', which means that the. ~- c2 a1 {" s
    // order of iteration through the `heatbugList' will be! f+ O- P8 B4 }. ~' l; ^4 c, Y
    // identical (assuming the list order is not changed/ l6 z$ `" ]2 m3 R1 J! m, N
    // indirectly by some other process).4 Y& T; I0 S6 p  b7 K  J
    % Y* N  g" o: y0 \
    modelActions = new ActionGroupImpl (getZone ());$ r  H  T8 B" o8 b5 B0 N7 f- Y

: p4 d2 b( ?1 ~7 ?    try {  v, J0 V; |, H4 N
      modelActions.createActionTo$message
! r+ u* H( c' \" G7 V        (heat, new Selector (heat.getClass (), "stepRule", false));
, S0 F! n# `1 o8 f& x5 c    } catch (Exception e) {8 j" q0 @1 h9 Y; X+ g1 H! k
      System.err.println ("Exception stepRule: " + e.getMessage ());. f0 q/ b* J8 W7 g
    }
# b  J/ l" e# e. k
- d) H: M6 R* K0 P    try {
. q5 X' y! m+ l5 D( q% N5 O( E      Heatbug proto = (Heatbug) heatbugList.get (0);) L9 u: F  z- k* W6 A
      Selector sel =
' o1 H' i( R/ D* A+ A. h# L        new Selector (proto.getClass (), "heatbugStep", false);, p7 N* I  G; b% D. c
      actionForEach =6 y- ^$ A2 S( y9 s/ j
        modelActions.createFActionForEachHomogeneous$call$ F9 e# w; l; S
        (heatbugList,
; Z0 P0 n0 J3 V2 b# \' X. A         new FCallImpl (this, proto, sel,
9 c$ ]1 Y% X, _  W6 `1 B                        new FArgumentsImpl (this, sel)));
" M: E9 s! ]% t: P& |" C    } catch (Exception e) {1 b, y6 \: b# c3 {" n
      e.printStackTrace (System.err);! G9 M- s$ S0 u; I, W4 K
    }4 J5 f' A' ?( _. m
    9 s7 ]  z% y" F2 F: ~6 C
    syncUpdateOrder ();
6 f5 C' J$ E# C* U2 B7 t: P- J# G/ ?5 r9 _
    try {' c+ q1 ]( @: O9 B
      modelActions.createActionTo$message
" n" m6 k+ S2 I2 \, }        (heat, new Selector (heat.getClass (), "updateLattice", false));  A' U, _# Q+ o2 f8 L
    } catch (Exception e) {
! v& M6 S% m1 o' n' q% i      System.err.println("Exception updateLattice: " + e.getMessage ());7 |0 l& m2 {+ X1 a7 ?
    }8 n( E7 o  I4 f; n6 O9 Y
        + D( |; M4 J$ n. {
    // Then we create a schedule that executes the
5 H' D: }" X4 {% [3 h6 r    // modelActions. modelActions is an ActionGroup, by itself it
/ A( r. R9 m# ~    // has no notion of time. In order to have it executed in( ~0 N0 l8 o1 }$ M8 f8 {9 _" ]! p
    // time, we create a Schedule that says to use the+ ~4 d$ Z( R; r9 E; H- r( i
    // modelActions ActionGroup at particular times.  This5 I; Y6 K/ }, Q7 _% v2 I8 o
    // schedule has a repeat interval of 1, it will loop every1 E; J) V/ a* @8 _
    // time step.  The action is executed at time 0 relative to& x' e( p' l9 N+ J& Q0 u
    // the beginning of the loop.: n! _/ w/ K1 L" Z
) [% F$ k  @+ b2 U1 j- z
    // This is a simple schedule, with only one action that is$ H& S: F4 R" j" Y7 I
    // just repeated every time. See jmousetrap for more6 u) c, f( ?5 g7 z) f' _# ^9 Q* F
    // complicated schedules.
% U3 j7 [9 ~: n. L  Q2 f7 Y3 q  
9 @( X5 n3 n& q& D7 l    modelSchedule = new ScheduleImpl (getZone (), 1);
6 {# d! d. B; u    modelSchedule.at$createAction (0, modelActions);. Z- I8 `5 d4 U" ^3 c5 s+ e) {7 U, {
        
5 i0 j) H2 J. N& h$ |. d    return this;- R+ d" i  Y) Y
  }
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