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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:
9 Y3 Y, U8 n4 ^7 V, ?7 h
2 \0 i6 z& G6 f2 e* R public Object buildActions () {
9 W" p2 B9 @: ^6 {: |5 C# T    super.buildActions();& w0 ?# T9 U* L8 q, S: F. Q
    0 p# B# }1 `* A# M" ]
    // Create the list of simulation actions. We put these in
7 r1 @) `/ o3 a    // an action group, because we want these actions to be
/ [. Q, x% V% j& [    // executed in a specific order, but these steps should9 D7 G8 U$ Z% Y& Z2 n- K
    // take no (simulated) time. The M(foo) means "The message7 m% G0 j. P* F' t. [$ \
    // called <foo>". You can send a message To a particular4 K2 B5 ~" o8 Q* f
    // object, or ForEach object in a collection.
% ]$ U8 w% O8 q  i        
0 Q: x1 m  Z+ y+ W* I! H    // Note we update the heatspace in two phases: first run' P+ V9 [8 p$ |! h: E0 Z
    // diffusion, then run "updateWorld" to actually enact the
, o" v3 Q/ d/ Y) e! W5 X! Q    // changes the heatbugs have made. The ordering here is
1 d1 Y* ^/ J8 T    // significant!2 J; n$ O/ {) @! Y1 T% Y& a
        
9 l1 q6 Y( S& b6 z    // Note also, that with the additional6 B8 @9 D: |1 d- @, f
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
/ x! i+ q" m- C$ t* A2 Z+ x* \    // randomize the order in which the bugs actually run9 C! I" N+ }: |) D
    // their step rule.  This has the effect of removing any
% U- b5 w2 N8 R    // systematic bias in the iteration throught the heatbug
' F/ K4 x3 z* x; q$ v+ I    // list from timestep to timestep
6 n3 d- A& g% n& R        , R2 `! A& {; u3 x% I, v3 O1 {
    // By default, all `createActionForEach' modelActions have; ^0 o  B1 ]5 G$ z7 e4 Y2 a8 H
    // a default order of `Sequential', which means that the
8 C( P4 f. w: R' Z4 k) F6 O    // order of iteration through the `heatbugList' will be
( t2 m- P7 ?  L# b    // identical (assuming the list order is not changed
! _! y2 o; z; W* i, F0 {    // indirectly by some other process).7 l4 \. Z& V6 b/ h. z
    9 J/ S$ F) E5 F2 A: G* f) Y
    modelActions = new ActionGroupImpl (getZone ());
* w" Q9 a1 b3 s2 A
2 ?! N" ]  v5 P, ^: L# J8 _    try {2 _; A+ V4 q# n$ |- V+ F) G
      modelActions.createActionTo$message
* p. M" V. f; s) P5 t        (heat, new Selector (heat.getClass (), "stepRule", false));% {8 Q  R3 X0 X/ f- Z
    } catch (Exception e) {; X5 w$ I0 z0 o. w
      System.err.println ("Exception stepRule: " + e.getMessage ());
6 K7 N. v9 `. t, R5 _  h! ~2 t' @    }3 A. ?5 z6 D1 b1 ]2 _

& u$ k& j1 x5 n# x+ T5 ^    try {2 K( ~1 |& E, l7 x
      Heatbug proto = (Heatbug) heatbugList.get (0);
- ]1 K; q- l" o/ O6 o( [      Selector sel = 5 K' y- A, D4 w7 O
        new Selector (proto.getClass (), "heatbugStep", false);( _9 j$ N8 e  U& C
      actionForEach =- O3 @' w1 B) R7 D* F' ~2 y0 M  M
        modelActions.createFActionForEachHomogeneous$call$ d% {1 ^* D; H/ j. U: s  e, X! L
        (heatbugList,
. ~# A( Q3 V/ I$ y3 K; _; `         new FCallImpl (this, proto, sel,
- p' }* h3 V, a2 B                        new FArgumentsImpl (this, sel)));) a: \* u7 S2 B* W" E5 [4 V
    } catch (Exception e) {
( c* g5 Z4 i. t& T4 c0 e      e.printStackTrace (System.err);7 J" d) ~; Y( `  L" n
    }
; |6 t: G" j# j6 _* F   
* Q6 L; V: D- D5 }    syncUpdateOrder ();
8 ~- R# ?5 J$ m% @
1 G; U4 D. h% j) ?9 j    try {
) c2 P6 i3 t% |7 k1 B6 |/ c      modelActions.createActionTo$message
! d: W  F; v3 ?) C3 ~        (heat, new Selector (heat.getClass (), "updateLattice", false));+ P* c! T" }2 x( L
    } catch (Exception e) {# p" V) |  p' v: z& t+ J
      System.err.println("Exception updateLattice: " + e.getMessage ());
8 u6 h: G9 Y" {" D    }
/ u( f) L, T5 }, C        
( ?* X+ W$ v$ j  M) A# h6 Z! P    // Then we create a schedule that executes the
) H- ^6 Z" q7 C- I    // modelActions. modelActions is an ActionGroup, by itself it
$ n4 _9 a6 ~0 i0 V    // has no notion of time. In order to have it executed in4 ~3 _* t% K8 I( n9 ?
    // time, we create a Schedule that says to use the
4 @7 v2 s: d6 }% Y# Z$ T    // modelActions ActionGroup at particular times.  This( J* u1 x4 F. i( A$ n
    // schedule has a repeat interval of 1, it will loop every9 r+ W. o# z8 _; G6 G2 a
    // time step.  The action is executed at time 0 relative to
) V0 |$ n2 ~' H- _; U    // the beginning of the loop.
; k% B5 z' `: L: O& Q/ c1 @- _* J) G
9 E5 m7 f& ]& ?    // This is a simple schedule, with only one action that is8 B9 C% ]% ~+ T7 h5 w2 {
    // just repeated every time. See jmousetrap for more) c" X  C( @9 o: ?2 h" U7 r
    // complicated schedules.
; M* q1 A& _$ c7 s; R4 K: |9 b1 Y: V& X  
4 A% g5 _  G2 T0 N    modelSchedule = new ScheduleImpl (getZone (), 1);  I% f; }) i# I& {5 D. i
    modelSchedule.at$createAction (0, modelActions);$ R# _, [) s- E& x# o# y
        8 a. M6 q8 k$ \% r7 Q
    return this;6 K5 v1 T' H3 L: m% y
  }
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