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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:
- V8 B8 g( Y' J$ A6 }' p$ j( r/ D+ F& O) M, O7 @% N. u
public Object buildActions () {
5 `$ W5 I9 A4 D    super.buildActions();
/ c* o$ c' b( K4 Z& ?   
/ m3 I, j0 q; g0 b% ~6 v8 n' z    // Create the list of simulation actions. We put these in1 F* T( K& H  Q6 i
    // an action group, because we want these actions to be4 @# w" S% |& k; c$ K( y8 `
    // executed in a specific order, but these steps should3 C6 c+ b$ @1 S  v
    // take no (simulated) time. The M(foo) means "The message
# |4 Q  t6 W; b/ D3 S  j    // called <foo>". You can send a message To a particular
; a! \5 S) j) A6 h( f: l* j    // object, or ForEach object in a collection.
! O$ a3 X% m" a0 \5 W7 B; ^' G; X        
% S) N1 L9 K' w6 a% i3 a    // Note we update the heatspace in two phases: first run
. B/ }* T/ J' z    // diffusion, then run "updateWorld" to actually enact the  G, E2 H  L+ Y! R
    // changes the heatbugs have made. The ordering here is
( o5 P; \  j/ `  a4 Z$ N. t7 D3 ?    // significant!/ l8 N+ F* r- l
        
, c( y" R0 r8 X4 M4 i    // Note also, that with the additional
8 p, x7 R) L$ N$ a7 k8 n% |3 y    // `randomizeHeatbugUpdateOrder' Boolean flag we can
/ h7 r/ I! a, C0 B" ?+ X    // randomize the order in which the bugs actually run
( d* ~0 m/ g! t4 E    // their step rule.  This has the effect of removing any5 Q0 @) F( _# |/ }
    // systematic bias in the iteration throught the heatbug6 Z' v9 E! W; P% j/ v3 U
    // list from timestep to timestep
7 ?* m. E5 Y! q4 r& A. J        
* Y; y2 ]4 |8 ^* |5 D0 s6 z# }    // By default, all `createActionForEach' modelActions have! H) U% Q% C6 t  s) _
    // a default order of `Sequential', which means that the
8 o5 G# F; x+ |! E7 i! X    // order of iteration through the `heatbugList' will be  o8 @* j- T4 j; P, @! M
    // identical (assuming the list order is not changed
* q( X2 U4 m5 x7 c* b! ^' e    // indirectly by some other process).9 J3 Y& c& A- h9 k
   
1 O1 A* [, l5 G    modelActions = new ActionGroupImpl (getZone ());3 W4 M' }, D' K( O: Y- X  X
7 ?" `3 E/ X0 k, g( X. k
    try {
. J1 F* k' b- \7 \- T0 a      modelActions.createActionTo$message; h" u' O4 p& E% ?3 ^
        (heat, new Selector (heat.getClass (), "stepRule", false));9 l; n: b' s) g. J: O3 V* X
    } catch (Exception e) {* Q: z5 P" K: x* g
      System.err.println ("Exception stepRule: " + e.getMessage ());! L; ?9 c# ]+ ~
    }  c+ y# N* h( W$ b( E- E; c- N. \9 ]
3 s. K7 _+ J) @: @
    try {
% X! P- m! T; Z9 Q+ w- P      Heatbug proto = (Heatbug) heatbugList.get (0);* u! I0 H7 j, t/ p- l
      Selector sel = - T1 Q0 s* j2 M
        new Selector (proto.getClass (), "heatbugStep", false);
6 \: e4 j2 B7 r6 e% l2 R4 ^$ C9 v      actionForEach =% i/ b: K) }% D  x
        modelActions.createFActionForEachHomogeneous$call1 @6 B1 \7 `$ \$ i4 R0 F
        (heatbugList,
/ @0 L( |) |; _8 a& F) e# r         new FCallImpl (this, proto, sel,
" t4 S* `2 I( \. Y" g0 B                        new FArgumentsImpl (this, sel)));' A- m& G' _" `- o
    } catch (Exception e) {3 U5 H8 Q  [  n  M! O
      e.printStackTrace (System.err);
; K  ^: j) }; I( [" _& }    }
+ r: B- |2 f8 N   
9 k2 ]7 w2 [" z" w: m    syncUpdateOrder ();
) N0 K) _0 q) A+ e$ J: N' Q* \3 |
    try {
' o* C& R2 K+ T      modelActions.createActionTo$message 4 j+ C0 ^+ K; v& P
        (heat, new Selector (heat.getClass (), "updateLattice", false));
* ~( @4 F- ?6 ~1 K7 O& v    } catch (Exception e) {4 r- t' z7 E  h! u$ G: b3 k
      System.err.println("Exception updateLattice: " + e.getMessage ());5 `; o$ r0 f7 u( o
    }/ G) [9 g; w( E) w! V; B
        1 q  f/ W; E+ N) w! F+ x  Y4 \
    // Then we create a schedule that executes the
( H* F: y+ T# V/ D    // modelActions. modelActions is an ActionGroup, by itself it
5 U' w! t% c3 t. {# e- z. M    // has no notion of time. In order to have it executed in
5 V" \5 H9 X( o0 h$ ~# b8 R; p    // time, we create a Schedule that says to use the. B6 h$ N" F! v3 F4 y- v
    // modelActions ActionGroup at particular times.  This
- j! S$ u. z! |) [: a+ _8 o    // schedule has a repeat interval of 1, it will loop every
6 \3 y" N) l4 k+ j8 G( N4 K    // time step.  The action is executed at time 0 relative to
1 k" E; {8 p/ o- |    // the beginning of the loop.
  x; B- `4 v& h) [' G! o
) C0 Y4 z6 M8 s$ R% w4 O. F    // This is a simple schedule, with only one action that is
0 u: W) ^; ^1 R- s8 b    // just repeated every time. See jmousetrap for more# n) O* X" N6 O1 r
    // complicated schedules.
# [9 D1 h3 p1 [  : y3 {2 i  b2 X1 E# A' q
    modelSchedule = new ScheduleImpl (getZone (), 1);
8 V4 K' {8 P. ]3 Y* {, }) c5 c    modelSchedule.at$createAction (0, modelActions);
/ f% z3 d" x# P' v0 m  D" K( U/ N* S        
! E/ I' h7 V* n# y5 Z2 [! F1 M0 C: h    return this;& ?' ^, u7 U, k3 W' I) P
  }
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