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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:, ?+ t6 l7 R) ]
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public Object buildActions () {' @# F2 [  p6 U9 B
    super.buildActions();' o  |$ Z2 ^! C4 t- Y
   
9 g" P4 \2 ~" `3 ?    // Create the list of simulation actions. We put these in
% v  g% L- D1 @7 Q* m    // an action group, because we want these actions to be
1 I9 }! _' u! I# {    // executed in a specific order, but these steps should
* T: c' x& h& U    // take no (simulated) time. The M(foo) means "The message
1 `" C8 `- F) Q    // called <foo>". You can send a message To a particular# q0 h, d* x( ?9 Q; l' H
    // object, or ForEach object in a collection.
+ |) l6 ~# y' t2 q        0 A. v8 N4 T( y0 j5 Y9 x
    // Note we update the heatspace in two phases: first run. n! J6 Q+ w- Q6 X2 Z+ n4 y
    // diffusion, then run "updateWorld" to actually enact the/ b/ O( y9 h& C) Y
    // changes the heatbugs have made. The ordering here is
; M% n; r4 D8 H! ?5 W    // significant!
  V! Y% a; W! \% }* x5 M        . u7 [6 z) N. \8 v& d1 g
    // Note also, that with the additional6 C+ p" |9 \% o/ r
    // `randomizeHeatbugUpdateOrder' Boolean flag we can$ \/ [; L8 u' ]; D) h5 f: k' p! d
    // randomize the order in which the bugs actually run
0 h2 i* a& y  S& K    // their step rule.  This has the effect of removing any1 ~) _2 H( ]0 F% J/ X7 h
    // systematic bias in the iteration throught the heatbug
. w0 e. K' s$ s5 }9 {! [: i( {& p6 j1 ^    // list from timestep to timestep% j+ I( c7 j/ U3 b
        - L2 D; H( h9 X" _+ \$ q
    // By default, all `createActionForEach' modelActions have0 @: T1 v* }2 a/ M
    // a default order of `Sequential', which means that the3 q+ ~: R# `2 {
    // order of iteration through the `heatbugList' will be- t$ ^0 L2 j% g2 [+ w$ o
    // identical (assuming the list order is not changed: D/ |2 `5 ^$ i/ k( e: n
    // indirectly by some other process).
+ w3 F+ R" v& V; T* [5 U: k- K    0 C, o8 t  P5 ]: X+ h
    modelActions = new ActionGroupImpl (getZone ());* ^% [4 ]. I* E

( D# `: T* D6 V7 j" m: R) {    try {
: n! C" c; I2 W      modelActions.createActionTo$message8 U6 o  D8 e. O" M  Q0 H0 O  h
        (heat, new Selector (heat.getClass (), "stepRule", false));
# k. J5 ^+ e0 k5 E, f    } catch (Exception e) {  [/ B7 U( h4 t3 w
      System.err.println ("Exception stepRule: " + e.getMessage ());
! P8 n  `3 a/ d1 G    }/ Y( n! O9 H7 {/ f2 N* F
& r  T: b# h$ g/ q; e2 B# e
    try {
* t0 S: J- l) V2 l* ^. S      Heatbug proto = (Heatbug) heatbugList.get (0);1 h0 F( N' u: s6 \# l* _# ?  ]
      Selector sel =
' k+ L1 g' M0 l: J+ t        new Selector (proto.getClass (), "heatbugStep", false);: U, ~. g7 O; i
      actionForEach =  e( L/ C6 G* j( F* ^
        modelActions.createFActionForEachHomogeneous$call
0 F7 n1 I' A; ~- D9 T        (heatbugList,
0 w0 L' I: g$ z+ E8 O         new FCallImpl (this, proto, sel,* X) g- z' j+ ], d6 L8 [  g7 r
                        new FArgumentsImpl (this, sel)));
' e* ?2 K+ n0 w( J    } catch (Exception e) {
* O0 T/ E, M: U! B7 C* \. d      e.printStackTrace (System.err);
0 Z0 o& N; a& Z. }7 h, j    }' I3 y) \0 |% E7 U6 b
    + `$ Q! h6 i! s2 d% X
    syncUpdateOrder ();, {, C5 F' r; T; {) U+ k
% @- ^3 t/ T5 R) R, Y4 D) [/ b# P
    try {
! z  U0 J/ A* J) q& Z      modelActions.createActionTo$message
& l( N- N6 \: S0 T3 m) }        (heat, new Selector (heat.getClass (), "updateLattice", false));
. r, L' j# f: a" c$ Y5 P    } catch (Exception e) {
/ I& W4 ?1 l/ u* a, N      System.err.println("Exception updateLattice: " + e.getMessage ());
! [& i. o) ~& Z    }
5 s1 E# L- L7 Q( |        
3 [& e$ N, a0 k    // Then we create a schedule that executes the
6 Z1 f& H/ A* H( w% N$ V" d    // modelActions. modelActions is an ActionGroup, by itself it
1 ?7 W2 A( U" h1 e; \( ?$ X& x    // has no notion of time. In order to have it executed in
. k+ {3 A& L# t5 Y    // time, we create a Schedule that says to use the, O. S5 s8 }  m6 @  m) K+ a
    // modelActions ActionGroup at particular times.  This
/ s0 d, Q4 D6 W& a% v3 S6 [    // schedule has a repeat interval of 1, it will loop every
' w  A3 z4 ]8 @    // time step.  The action is executed at time 0 relative to
" _0 C8 \4 }; R! O    // the beginning of the loop.
& \# y2 |' Z% j+ x5 c% K% \
( `% `6 y, t/ c. W8 w    // This is a simple schedule, with only one action that is4 m; r5 W) U1 Q, i$ w; O
    // just repeated every time. See jmousetrap for more  d. n6 b! Q0 y( T( g' _6 X6 e
    // complicated schedules.
; e  z: i, a  |' ?* X7 u6 W  " e: s+ X$ [# h' \% Q
    modelSchedule = new ScheduleImpl (getZone (), 1);
! r. ^# [) |; B; i1 _    modelSchedule.at$createAction (0, modelActions);
( i' W9 o9 t% k: p          L7 q# b! R+ \- c
    return this;
* `8 m# D! _+ ~  L  }
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