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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:
/ T- c1 H4 h1 L- s& }% O' F5 ]. ^& ^" `8 J9 O
public Object buildActions () {
  }0 e! i; x$ x5 q' h% L    super.buildActions();* H6 g! _0 @' a  R: u
    2 o4 G) z/ x& f2 p5 C$ O5 d# \
    // Create the list of simulation actions. We put these in
% k! D) d; K, m+ g    // an action group, because we want these actions to be
& G3 n! m2 e& K# @    // executed in a specific order, but these steps should- ]# e7 g- Y& A) L( g0 s
    // take no (simulated) time. The M(foo) means "The message
, W+ R: ~: [3 p9 @8 p# J+ G4 A2 M% z    // called <foo>". You can send a message To a particular6 H( H( X9 U! y- |
    // object, or ForEach object in a collection., S# ~" Z8 n- A  w/ B3 A
        ; [! g1 E( b8 S7 A+ }9 r& O2 T
    // Note we update the heatspace in two phases: first run. G1 k. U  r& ]( T( x
    // diffusion, then run "updateWorld" to actually enact the
& g/ m9 b. p4 ]    // changes the heatbugs have made. The ordering here is
- q/ b/ N  x/ j    // significant!
0 I4 @0 B: L) S9 G        5 x( t- B3 C5 G& E
    // Note also, that with the additional
: {  y7 S% ^) [: A2 ?' Q; @    // `randomizeHeatbugUpdateOrder' Boolean flag we can, S1 z" X2 D0 r7 R
    // randomize the order in which the bugs actually run
) H' S1 n. ^4 v$ H( k    // their step rule.  This has the effect of removing any
( ]( |8 X+ s0 K    // systematic bias in the iteration throught the heatbug
# S/ e+ J, D1 c. W( z. _3 e    // list from timestep to timestep
3 |' ~0 F3 F1 a# A! `% Z2 x0 }        
  Z9 `( k4 Q$ ?9 B4 h& ]' E    // By default, all `createActionForEach' modelActions have8 M' w1 U9 R& G/ P. ~8 E) v
    // a default order of `Sequential', which means that the: s4 q( Q; q, E$ s1 X
    // order of iteration through the `heatbugList' will be. Y- e+ r' K& X! S- x
    // identical (assuming the list order is not changed+ q9 V1 M- t# Q& O0 S
    // indirectly by some other process).+ a8 A" N/ l3 m( T( X6 E% Z9 T- W
    " w  }% }9 v4 x. r' g
    modelActions = new ActionGroupImpl (getZone ());- o9 ~% f: a! H- L& p, g0 E1 Q
8 s4 a4 }4 b1 K; ^5 i8 V2 L' P
    try {
# R! L& `5 K% e      modelActions.createActionTo$message7 s, r: k5 R+ r; o1 ?
        (heat, new Selector (heat.getClass (), "stepRule", false));
/ ^) L0 r5 N. ?5 X6 |9 |    } catch (Exception e) {
# W1 j# K' g0 w% w# u6 }      System.err.println ("Exception stepRule: " + e.getMessage ());- {% J/ H% v7 B+ |+ o3 N
    }( B6 j; R1 q: @/ |3 \( q

' h: ?0 \" w& g7 I2 V5 K    try {
$ \( q* ^  [' @; X9 L      Heatbug proto = (Heatbug) heatbugList.get (0);& i2 Z4 r6 V8 ?& H2 W! F8 c. ~
      Selector sel = ) Q* R; ~5 m4 H+ P( x+ z
        new Selector (proto.getClass (), "heatbugStep", false);" o" O* x5 m! ?! F
      actionForEach =4 C' D. f( ~7 H' `! m
        modelActions.createFActionForEachHomogeneous$call
) Q: v! ?4 b8 h* W. s        (heatbugList,3 v) B# G( L* G, R, {  r
         new FCallImpl (this, proto, sel,  h, Z8 o. x1 V; D' @" `
                        new FArgumentsImpl (this, sel)));+ m0 i3 m5 k! h4 d
    } catch (Exception e) {
; E9 ]6 \( I* \/ b7 y( `      e.printStackTrace (System.err);$ L+ v/ O3 S/ q, G
    }
6 v( v8 N& ~: ]   
6 i& n( Q4 `7 h# _/ E9 f    syncUpdateOrder ();  m! |, E3 L; T. M1 k

9 |: q" s3 |$ U4 H* K; H# H, U( y- x    try {
( y0 |" o% G) c+ n  l' ~      modelActions.createActionTo$message
0 e3 c5 t% m& g% C8 q( N! z, |        (heat, new Selector (heat.getClass (), "updateLattice", false));9 _6 Q0 @: k5 z. I/ F9 [
    } catch (Exception e) {
( F+ |2 t5 H& ?8 r! V% X8 z      System.err.println("Exception updateLattice: " + e.getMessage ());
0 c, }0 o7 `7 t7 |    }0 Z! f2 f4 @% t. V% m5 ~/ K
        
; ?" D8 V' ], j% b' S! t7 V/ k    // Then we create a schedule that executes the5 @  N- Q! [9 f$ _. ^
    // modelActions. modelActions is an ActionGroup, by itself it
8 s# @: N- I( B5 N0 c/ b. E5 x    // has no notion of time. In order to have it executed in
' D/ c$ |! o4 `3 ]+ H    // time, we create a Schedule that says to use the( n& S6 R0 U* }
    // modelActions ActionGroup at particular times.  This
9 w  c+ i" O* c  {" T    // schedule has a repeat interval of 1, it will loop every
. w' g" ]0 e) i: U" a# [8 Q6 W    // time step.  The action is executed at time 0 relative to5 h, }6 z/ C, Y+ O
    // the beginning of the loop.
% b9 Z, [6 C" j2 ^1 `/ K! S4 E7 e; l4 q
    // This is a simple schedule, with only one action that is7 f+ c8 @$ f$ y" H9 i4 @' Z
    // just repeated every time. See jmousetrap for more+ F9 P+ t% N" Q$ ]  r7 U4 P1 k
    // complicated schedules.( |- E6 s- J, D* x; W/ }
  , D9 G1 Q" f! C
    modelSchedule = new ScheduleImpl (getZone (), 1);' l5 i& \5 h$ |
    modelSchedule.at$createAction (0, modelActions);
3 ^  y* T# e, M. x$ a        
9 r; D8 ~1 X/ H  N# V+ o* F    return this;
' e: P& q3 X: ~& N5 j  }
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