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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:
; o4 U" z5 {& f4 _
* h8 V# {3 s# z% v public Object buildActions () {3 S& @- n5 ^$ ]
    super.buildActions();4 d9 K  G  c9 z: c
   
' |1 u8 d, A9 z    // Create the list of simulation actions. We put these in( z* {( ], l7 s! y4 E1 x
    // an action group, because we want these actions to be
3 \+ g6 r& [9 W6 r    // executed in a specific order, but these steps should
. c) l# o' F5 w0 g    // take no (simulated) time. The M(foo) means "The message
. S$ R, ^4 {* |& W- {$ O    // called <foo>". You can send a message To a particular
, I: U! l; \9 N" G0 k5 K    // object, or ForEach object in a collection.% u! x3 F+ J. t6 ], }, x/ ?4 l0 a
        " u/ O4 w$ Y9 {) U6 ?
    // Note we update the heatspace in two phases: first run
& l0 m2 l8 {1 c& c    // diffusion, then run "updateWorld" to actually enact the
% j9 A% y) Q6 R    // changes the heatbugs have made. The ordering here is
1 U) ~: P' t. e$ H7 o$ b6 c. }* B1 j    // significant!; I% i8 F# t0 q
          i5 Z2 o4 X$ W
    // Note also, that with the additional% k$ d* l% w7 q7 Y' j8 z0 m
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
. b+ x7 D# T2 E# R1 X    // randomize the order in which the bugs actually run7 w' C+ }6 t* b6 r7 A9 w
    // their step rule.  This has the effect of removing any
6 L, a+ G. G- c5 q5 P    // systematic bias in the iteration throught the heatbug
/ e5 Z- v- D4 R) u2 g0 Q2 E    // list from timestep to timestep! j* C( O# U# k# w
        : e( ?3 p* ^8 D3 ^: H
    // By default, all `createActionForEach' modelActions have
8 a% F3 C. M8 S4 {    // a default order of `Sequential', which means that the
$ D; i0 x4 |" }# k7 w8 A& c    // order of iteration through the `heatbugList' will be4 b6 N# q8 ^$ d* x
    // identical (assuming the list order is not changed1 n( d1 u% R* m+ _/ C2 C8 L
    // indirectly by some other process).
  z, e) v7 E1 F    # {: s, A! s; |) X
    modelActions = new ActionGroupImpl (getZone ());
  p- {8 M: |8 t
+ L- d" |& s+ I- ~* C7 K- d6 y    try {4 |' B; [" M. }" \- R- b
      modelActions.createActionTo$message
3 R/ ~' k' z& L6 G        (heat, new Selector (heat.getClass (), "stepRule", false));
/ k+ C8 f( K+ j7 Y7 Z+ j# m8 x    } catch (Exception e) {$ k( q6 I" I( g
      System.err.println ("Exception stepRule: " + e.getMessage ());
3 g$ w2 P: N0 k$ C3 X4 ^( |2 v    }
3 A8 l) J* A  z* g& i6 H9 ~) x4 g$ S4 e$ D" y9 E! m$ B* w: S
    try {& c* ^; V5 x. n4 v
      Heatbug proto = (Heatbug) heatbugList.get (0);# f3 l! p7 C+ }
      Selector sel = 1 f1 `+ ]1 _* @
        new Selector (proto.getClass (), "heatbugStep", false);* h4 K8 ]- w! x" Y" Z
      actionForEach =
# b0 U$ @# }* [1 ^( i3 s& J        modelActions.createFActionForEachHomogeneous$call
  a" F# N0 c. L. R7 k        (heatbugList,
0 e" p7 n$ G+ M         new FCallImpl (this, proto, sel,
+ d! ?4 t- H5 ~' g0 b% q3 g3 l                        new FArgumentsImpl (this, sel)));
) ~. c. U* s1 T/ ~! I( g4 q    } catch (Exception e) {
: p# }' D- x# Y6 T; O8 e2 K* h      e.printStackTrace (System.err);" p: Z! X$ S9 Y: G; h4 r4 d
    }
4 V& `7 {6 b+ d4 c    3 C: d: E  A- w7 A* B  e7 N; R
    syncUpdateOrder ();
3 v5 C  `  @  d5 P
: ^8 \5 p1 X6 H# V( Q" k    try {6 E0 r' |+ I6 H+ C! U7 ]6 `; o( c; o
      modelActions.createActionTo$message , ^" v+ o/ `1 D: L% [- S3 u
        (heat, new Selector (heat.getClass (), "updateLattice", false));7 @0 G, |- E6 l9 }! c4 [5 X" d: N* f
    } catch (Exception e) {6 l" ?6 T8 z* e
      System.err.println("Exception updateLattice: " + e.getMessage ());6 j$ m- Z7 y: P3 R) j6 Q: Q# y  X2 D
    }
; `+ c8 g. s* m/ ?  e        - Y  g' O: l# K# g
    // Then we create a schedule that executes the
( Z5 b2 V# ~8 E: Q8 l: m9 S    // modelActions. modelActions is an ActionGroup, by itself it2 M( S/ E) ~/ N: F9 d5 t
    // has no notion of time. In order to have it executed in( T: t9 r: O7 Q
    // time, we create a Schedule that says to use the5 v: c+ p3 X8 X7 Y+ K1 d) P6 [
    // modelActions ActionGroup at particular times.  This6 q; P, L% g! y& @
    // schedule has a repeat interval of 1, it will loop every
7 G, `0 f) \; @( y) |7 c8 s    // time step.  The action is executed at time 0 relative to
. i, c* x. A. s; z    // the beginning of the loop.& C* A, S3 r' C7 K3 U/ P3 u
" Q6 x- J+ y* {# k
    // This is a simple schedule, with only one action that is
/ X0 K/ s+ T( r2 d- A% W$ C9 g$ V    // just repeated every time. See jmousetrap for more9 L. Q. v! p3 f2 E8 f( }2 K7 ~* W
    // complicated schedules.0 `- p7 A# z- [% U, \6 y6 R0 y
  
$ O" G$ x  ?# ?$ ?    modelSchedule = new ScheduleImpl (getZone (), 1);; c) d6 z1 V1 ~8 z1 [
    modelSchedule.at$createAction (0, modelActions);
8 P4 J& B3 `; ~5 B% n: I! H$ G! t# k        0 \' q8 V7 I2 C5 R# i# Q- _
    return this;
/ a$ r  ]" L- @8 S9 O2 S' D  }
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