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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:
$ h% _) O% s  t1 @$ o6 u% r$ Q" s% h
public Object buildActions () {; {, B4 ~4 R5 _1 f, l
    super.buildActions();1 U; S: J2 j. G3 O2 x7 |
    + ~0 R* q- O1 u" @4 @8 S, o! \
    // Create the list of simulation actions. We put these in
9 I* X! n' S1 o% j9 e0 F) Y    // an action group, because we want these actions to be8 Y: o6 F" n. c+ ?: F
    // executed in a specific order, but these steps should
7 v: z/ T3 ~  Q2 {  \    // take no (simulated) time. The M(foo) means "The message
, M8 {& P, S4 w5 ?2 w    // called <foo>". You can send a message To a particular6 u) \$ ~" E& Y, W0 H4 N
    // object, or ForEach object in a collection.
8 Z5 U" g$ R4 A! D4 N        * x( N' N5 i, f7 u" G
    // Note we update the heatspace in two phases: first run
: P4 h5 H. q" U& m7 Y; p    // diffusion, then run "updateWorld" to actually enact the2 x  ]9 \) {' ]) u
    // changes the heatbugs have made. The ordering here is5 e. x3 V4 `6 d& Y6 X, j' _
    // significant!# B. W# f1 E) U
        
1 t) A) H3 r) l8 s    // Note also, that with the additional
$ B" e; u' n$ R5 e' d    // `randomizeHeatbugUpdateOrder' Boolean flag we can
6 h% V+ F8 T: Q    // randomize the order in which the bugs actually run
8 F) O9 E$ x" N8 O9 V) S    // their step rule.  This has the effect of removing any/ \. ?8 w5 }9 t0 O+ `' y$ f
    // systematic bias in the iteration throught the heatbug4 z: a$ Q$ K+ u* [
    // list from timestep to timestep, U% C( R! ^. s6 B) Z5 B
        
- s" k! J; P$ P' c3 [9 I    // By default, all `createActionForEach' modelActions have& E! U2 y! G: V3 M8 c8 a& C
    // a default order of `Sequential', which means that the
0 e* n: ^8 Y) h- _" Z3 ~4 A. L    // order of iteration through the `heatbugList' will be4 ~/ ]' @: T, @1 ?* H* p# o0 |! ]
    // identical (assuming the list order is not changed3 ]1 N: `2 [( v% N
    // indirectly by some other process).
$ S$ v- C5 M* u  P4 Y# j: J* M   
5 @. G/ W4 `7 P1 x) p    modelActions = new ActionGroupImpl (getZone ());  O7 }: c9 w. F& u
  q: T& q0 k; Z5 N. E0 o. n$ i
    try {& ^; N3 ^% v1 Y
      modelActions.createActionTo$message
! K* [; j  u1 ?: X9 N        (heat, new Selector (heat.getClass (), "stepRule", false));
. c' U# u, ^' P1 U; N0 G    } catch (Exception e) {
& }' ?3 ]0 \' F) W. Z4 |      System.err.println ("Exception stepRule: " + e.getMessage ());* |/ H- g* w) }- C; P8 p9 D9 d
    }! `) x8 i; P' z
3 }0 c0 d& C1 V, M  Z
    try {
5 k  o+ T) f1 K      Heatbug proto = (Heatbug) heatbugList.get (0);
7 o! a: J2 T' Z3 j1 q; k      Selector sel = % O# N9 ~4 F, l" {
        new Selector (proto.getClass (), "heatbugStep", false);9 M. D8 ~( K0 ]# e, h$ f% c
      actionForEach =. s& [9 J, N& `; E" ^
        modelActions.createFActionForEachHomogeneous$call
2 O2 K' Q( w* Q3 o' Y/ U. K        (heatbugList,# a% u4 [$ D2 ?! L
         new FCallImpl (this, proto, sel,
, B. A/ D' l, R2 \2 w                        new FArgumentsImpl (this, sel)));  U' f: I( Z  ~; I1 ~7 T" K) A
    } catch (Exception e) {3 c  _, m9 p% y8 p
      e.printStackTrace (System.err);
  S5 Q4 ?/ s2 v0 J. i) n$ c4 R    }0 Q' c& I  `7 T; U6 u  o4 a9 M% Y
   
9 m- E, n/ Q3 c+ a9 S& h    syncUpdateOrder ();$ G5 O- c: \0 w" c$ n  n) j. D/ h

) e4 Y6 b0 n& k+ h1 w" M8 Q$ S/ M    try {
) ^1 Z) ]- [: v' H5 i      modelActions.createActionTo$message : V* K( j9 i  R# T' @9 j
        (heat, new Selector (heat.getClass (), "updateLattice", false));
, M2 m: C9 Z1 \9 g, E0 \- U% e4 c    } catch (Exception e) {$ ?+ S0 c9 A* [, C/ {4 @" o
      System.err.println("Exception updateLattice: " + e.getMessage ());- `5 V: x# u4 H. Y
    }
& h* f2 k" @  E2 c4 e0 C$ o        ) \+ ?' h4 l& b
    // Then we create a schedule that executes the# i( w5 _8 X) c) ~6 o; {
    // modelActions. modelActions is an ActionGroup, by itself it
& A$ L" q6 M/ e) u* ~" y  |" n3 O2 G6 i    // has no notion of time. In order to have it executed in8 v- F" e2 ~7 ~: x0 H
    // time, we create a Schedule that says to use the) G# o3 l6 j3 N2 _& ~
    // modelActions ActionGroup at particular times.  This
" j: _6 u$ ^# N1 v% o1 h    // schedule has a repeat interval of 1, it will loop every# a5 w0 \& q* p
    // time step.  The action is executed at time 0 relative to
# n! ]' D, }2 u  Q. H5 f    // the beginning of the loop.
; P- N* ?5 p% h& [0 p% R
8 c' D1 _( J1 s    // This is a simple schedule, with only one action that is# b* i8 Q) j( d6 U9 _2 u3 S" M
    // just repeated every time. See jmousetrap for more/ t: \- q* [, z8 f
    // complicated schedules.& D8 _1 I7 }" T' v& K4 ~
  - a! Z: G& i; I) H0 L8 a+ k% H" e- G
    modelSchedule = new ScheduleImpl (getZone (), 1);
  E" c1 g# D  W* x3 B$ o" d    modelSchedule.at$createAction (0, modelActions);
  `' F$ S" j8 O8 _        
4 q. z/ V/ v/ A6 k    return this;$ _0 W" Q6 y  ?0 M) p
  }
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