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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:% m$ E  o4 K" H7 \. N; m( k

, |, X! H  X: o2 L# i public Object buildActions () {
1 J0 g7 v! d) h9 X3 U    super.buildActions();
+ t2 b" S3 l( S4 }# Z9 B    0 u7 a) b1 B2 M# X7 Y
    // Create the list of simulation actions. We put these in
- y$ S7 l3 C, A: w    // an action group, because we want these actions to be$ ~* d3 K+ P' B9 H
    // executed in a specific order, but these steps should$ j) D) x" N! `1 ^  l
    // take no (simulated) time. The M(foo) means "The message
, @# `" t4 t" }! p& i    // called <foo>". You can send a message To a particular
1 ^. q1 E2 X$ u& `8 A( J6 W    // object, or ForEach object in a collection.
, Q* ^( s6 V) O1 \        
. D& V: N2 E- N* c$ |5 K9 \    // Note we update the heatspace in two phases: first run8 o4 R* T& Q0 g: o1 h
    // diffusion, then run "updateWorld" to actually enact the( w6 s" O2 I  ~" L
    // changes the heatbugs have made. The ordering here is1 r$ A2 s+ W# v+ s! z
    // significant!+ {7 M' N/ V* Q
        
" M9 H1 \! {/ |  \/ H7 r    // Note also, that with the additional
) }% S3 J" w2 t    // `randomizeHeatbugUpdateOrder' Boolean flag we can
3 j0 m6 L7 z; S7 F( V    // randomize the order in which the bugs actually run
, o/ w" ]6 Y7 M0 Q1 k* s- v    // their step rule.  This has the effect of removing any
  i1 X/ n( {6 O3 o    // systematic bias in the iteration throught the heatbug/ p2 \" |; i7 n" \
    // list from timestep to timestep
/ I4 T0 \# x8 z: l! m. N/ e$ y        
( t7 b/ _( D' ]! I3 r# r2 q    // By default, all `createActionForEach' modelActions have0 R/ U/ X: I" R
    // a default order of `Sequential', which means that the
- |1 M$ G; K, b( E. |    // order of iteration through the `heatbugList' will be& o8 o+ g+ y, f- c5 ^
    // identical (assuming the list order is not changed- X6 k/ [3 a, v" @  n$ A
    // indirectly by some other process).
, w& c& o2 P; Z( }0 o. U   
) [+ O& a1 l/ C4 s. m( o  h    modelActions = new ActionGroupImpl (getZone ());( b$ _8 e. l% z0 w

2 }: Q9 P8 }, w6 e/ r+ f( _    try {6 Y+ n2 V4 j2 O) }$ q3 O) z
      modelActions.createActionTo$message( ~2 b$ |' V% z: P2 v
        (heat, new Selector (heat.getClass (), "stepRule", false));
3 [" \: ]" X5 J. T; C* F, ?    } catch (Exception e) {
. }3 E9 S- l5 O+ v4 M- w7 O      System.err.println ("Exception stepRule: " + e.getMessage ());
7 J% m, Z. }6 i$ h    }
+ c/ U1 i2 M. T8 t4 U6 e  ]! H9 z* W. w1 ?; t3 {4 v/ S! t4 ?1 D
    try {
+ ~& K& w) X) r) k4 V      Heatbug proto = (Heatbug) heatbugList.get (0);# I6 Z0 M) Y- J* h8 u# s
      Selector sel =
# ?2 }/ B6 e) y3 Z# ^$ l/ S        new Selector (proto.getClass (), "heatbugStep", false);
  r. G' P4 i7 v, V5 I: Y: K      actionForEach =9 G. z. Q( Q7 s( G4 Z; y
        modelActions.createFActionForEachHomogeneous$call- i3 d9 v3 H5 U7 r; C# D4 m; P
        (heatbugList,0 ?* N# N' Q" s
         new FCallImpl (this, proto, sel,
9 Y' H8 C9 X, @6 H+ s5 h! v                        new FArgumentsImpl (this, sel)));* f7 J  b: P% C# n# q1 R4 s
    } catch (Exception e) {
7 |8 I& @+ o% k( u      e.printStackTrace (System.err);3 m/ S- _$ g- `
    }
. j* g9 B) U4 O, t  B6 r   
9 f" G) E, D4 H( z    syncUpdateOrder ();7 [8 O8 d* F% w! A/ Y
5 v2 A% E1 |% t( b6 \
    try {# s8 \# k- l4 {  c( I: d
      modelActions.createActionTo$message
* D2 B% w4 @  e5 s5 w) F/ S        (heat, new Selector (heat.getClass (), "updateLattice", false));
$ h1 g0 y' w' ]( f9 I1 P    } catch (Exception e) {
0 A- o5 W$ V3 V4 P- U      System.err.println("Exception updateLattice: " + e.getMessage ());5 Q+ I2 j2 E) K  j% U
    }
6 Y0 o5 d  {, R: P; g& e, G5 u        , y9 D& k& \; F* P3 W: A
    // Then we create a schedule that executes the
2 n3 y% u8 a/ l! k5 }    // modelActions. modelActions is an ActionGroup, by itself it
( d5 y/ n( R9 h+ v! [3 R0 A    // has no notion of time. In order to have it executed in' d7 }; O+ ?, r* I" R- Q
    // time, we create a Schedule that says to use the! F! q9 @2 t& e( [' k
    // modelActions ActionGroup at particular times.  This
$ w) s- R* q, S( R6 J! b    // schedule has a repeat interval of 1, it will loop every
7 d& v- z; s* E# d. v2 j- }! U6 a    // time step.  The action is executed at time 0 relative to! r8 I" ^: u: Z2 d
    // the beginning of the loop.% A" A% v2 R( d* x+ G: N2 ~
  ^& a; k. U; e" O1 [# Q
    // This is a simple schedule, with only one action that is
1 o+ n# O8 N  b+ U% m    // just repeated every time. See jmousetrap for more+ I, s3 U: J2 m: f7 _. T
    // complicated schedules.. W2 ?- \/ j4 }1 U
  
* H/ D1 h8 Z/ }    modelSchedule = new ScheduleImpl (getZone (), 1);
, L6 ]% s; N" F9 g& q! ~4 r    modelSchedule.at$createAction (0, modelActions);
3 k4 Y% t/ a* _& [        ' R/ j* b$ U- }. r0 }+ J1 m
    return this;  X1 j- a1 G* W7 _; m
  }
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