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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 `0 x! S; {/ d8 D
9 S: z/ q6 Y3 }' D- g; Y public Object buildActions () {
6 p; Z( j) T3 [1 P3 U9 R" }+ i. u    super.buildActions();3 n$ d2 J" z7 D) r( ]5 @8 I
    6 M7 Y) N" r* y7 _( s) O% E
    // Create the list of simulation actions. We put these in5 f  \, x/ {3 Z! i- p4 h
    // an action group, because we want these actions to be
& ^! K  X. ]4 h" w7 y3 o; o    // executed in a specific order, but these steps should- |: J* I* }2 Q8 c1 {  T
    // take no (simulated) time. The M(foo) means "The message: S. w  D  x4 i3 ?, ^
    // called <foo>". You can send a message To a particular, D! ?( V+ n# l$ d7 ]* Z" O
    // object, or ForEach object in a collection.
, N  q1 H3 n. u0 \, h        
! Q' L/ ]% r- R" z& ~    // Note we update the heatspace in two phases: first run
4 ^4 d6 Q3 p! K- ^    // diffusion, then run "updateWorld" to actually enact the
6 }* y2 i8 Z) ]7 F4 v0 Y    // changes the heatbugs have made. The ordering here is
' p& s7 `/ O+ }! o  \) ?$ X    // significant!* N0 f: P4 n% q$ X
        
& Y3 X$ n# \9 H8 p5 t7 G; ?% _    // Note also, that with the additional3 o1 \6 O# V8 t
    // `randomizeHeatbugUpdateOrder' Boolean flag we can& E& V% Y, P0 E* @6 E( m4 C: C
    // randomize the order in which the bugs actually run# q. E7 C# O1 \! @6 Y8 l# X
    // their step rule.  This has the effect of removing any2 F5 d( g) F; p* p1 F
    // systematic bias in the iteration throught the heatbug6 a7 p. h" B4 }# o$ _. \) J4 ]! W, I
    // list from timestep to timestep
) F7 m( {4 d' O+ N8 c        1 t0 p9 f* i- D
    // By default, all `createActionForEach' modelActions have& n8 }9 q) R# s1 y9 Q
    // a default order of `Sequential', which means that the# t6 @& B8 x" P) d+ [# C' l
    // order of iteration through the `heatbugList' will be' x6 O3 A$ e: Z* J2 R; U& g
    // identical (assuming the list order is not changed: Q) T) _- f" p2 T  A
    // indirectly by some other process).! H! q2 u  @9 y% L
   
1 a8 Z1 e6 P" G" z$ ^7 _8 F5 X    modelActions = new ActionGroupImpl (getZone ());
* E' G4 p$ K  S$ E# }+ h7 |
4 Y. f5 G0 |+ i( F: x/ L- y    try {# D/ |, N; \0 @- l2 _& s/ {
      modelActions.createActionTo$message& O% n& s) o  L! `$ ?2 z3 v1 i& c/ T
        (heat, new Selector (heat.getClass (), "stepRule", false));
5 O; s# B) J( C, |- C1 ^    } catch (Exception e) {
( L5 B* `4 M" m  Q( A) H' f      System.err.println ("Exception stepRule: " + e.getMessage ());
. ?, `( k3 @! S  i9 [2 ?    }
" W: j0 i, R# |5 V0 o9 {' i& z0 a% ?$ c/ ]6 \
    try {% r9 w/ d& {+ U, S8 U
      Heatbug proto = (Heatbug) heatbugList.get (0);
% ^0 w+ k1 |8 H8 i, m7 a      Selector sel = & E4 L, R; {4 Q2 L" `. l! m/ H
        new Selector (proto.getClass (), "heatbugStep", false);
: l5 G. d, w" m9 |7 a" q, M      actionForEach =
% Z+ I6 J: U  O; @9 q) \0 Y; g        modelActions.createFActionForEachHomogeneous$call7 u/ a5 F1 ?3 E9 _" a
        (heatbugList,
6 z( B3 d: g+ w7 |         new FCallImpl (this, proto, sel,
, D" u  P/ g2 {5 y1 @3 d* @                        new FArgumentsImpl (this, sel)));8 `# n# ]: f* x  ]$ \
    } catch (Exception e) {
& q( S; v* D& A$ v# G, X      e.printStackTrace (System.err);# _) s& F: c+ j9 }/ ?
    }/ I1 h% F: i* @( T
    6 X, m2 S  \  f$ n9 v$ i+ U; u/ X! Q
    syncUpdateOrder ();
& o  k' Y& E; G6 c: _+ [- C8 w$ l+ l; W$ {$ k
    try {4 Q- R- t% m0 f( j, X9 Q+ `2 w3 D2 Y
      modelActions.createActionTo$message $ k6 }, r* D/ T" Z  `+ Z
        (heat, new Selector (heat.getClass (), "updateLattice", false));% M3 d+ G; t( c( w  Q  F/ S
    } catch (Exception e) {' F0 U+ ^9 i  W8 P7 S
      System.err.println("Exception updateLattice: " + e.getMessage ());/ q% Y. Y& L* f+ u5 r: p( S  w
    }( r" V4 P4 O0 _1 P8 `$ L) e$ U
        
. K4 ^3 n+ Z8 R    // Then we create a schedule that executes the7 \0 j+ o4 ^8 Y" {2 w
    // modelActions. modelActions is an ActionGroup, by itself it! x" [) [: E( Z& q' \: x
    // has no notion of time. In order to have it executed in  i+ i, b2 C4 @" L  l1 V1 W
    // time, we create a Schedule that says to use the' w! w* t" K# y: G  U6 O1 |
    // modelActions ActionGroup at particular times.  This
% |: o& R8 q! E1 \" }" \+ @    // schedule has a repeat interval of 1, it will loop every) J7 v5 q& g3 d8 A3 D: i
    // time step.  The action is executed at time 0 relative to7 V' W  n! t/ A9 @6 y2 D
    // the beginning of the loop.
# u) L5 p4 Q' q2 o3 G
7 b% @$ h* F- T4 W- r9 {% d    // This is a simple schedule, with only one action that is
+ W0 w2 ~1 P3 c$ v. W# I* ]* ~3 n# J7 X    // just repeated every time. See jmousetrap for more4 l" G3 z* A# v  z
    // complicated schedules.
' s2 v0 R! D3 D' s4 g2 G4 |  [  
5 c! G1 @: ?$ k8 t. e1 m% [    modelSchedule = new ScheduleImpl (getZone (), 1);
; d, G, f0 \9 p2 f    modelSchedule.at$createAction (0, modelActions);, G2 n) O+ b/ |+ V
        4 y6 P9 Y9 b  ?6 i# o5 J
    return this;9 N( `/ E7 b' q' D& a& c0 `3 N
  }
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