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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:
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0 u: O" H, ~0 L* k  F9 P: H& G public Object buildActions () {
3 x: G' J& E2 K    super.buildActions();
$ m6 s% K- }/ I9 L5 y' x. {" D    + T' `$ U/ N9 X: ~$ F: X$ \7 W
    // Create the list of simulation actions. We put these in; E* ~8 ?& e7 @
    // an action group, because we want these actions to be
; z8 O9 v) l% E4 ~    // executed in a specific order, but these steps should8 \9 |3 U# k' \! b1 `
    // take no (simulated) time. The M(foo) means "The message5 D, i: I( L, G0 g
    // called <foo>". You can send a message To a particular% F  f! ~) _3 ~) L3 ^8 r( n
    // object, or ForEach object in a collection.. x. \8 I2 }9 I: G
        
7 P  W: p' S$ X* ~    // Note we update the heatspace in two phases: first run
7 o* T( `, U4 `9 n% e+ w    // diffusion, then run "updateWorld" to actually enact the4 }9 M: [2 p" t' N
    // changes the heatbugs have made. The ordering here is7 x3 j: @) P" _4 K5 q$ M
    // significant!
0 N, o, s; v4 |9 o        
# P2 K& j. b+ S3 @9 ~    // Note also, that with the additional
& ~- D7 D& Y. J' D5 q# p6 u) I0 c( t, C    // `randomizeHeatbugUpdateOrder' Boolean flag we can  }( b1 Q! C- {! r9 D3 L9 A/ ?
    // randomize the order in which the bugs actually run
9 a; {8 t/ p) y9 ?' E# m. ?    // their step rule.  This has the effect of removing any6 R6 |% s$ |& U6 f+ S! D
    // systematic bias in the iteration throught the heatbug1 b, ?2 C  E2 }; x
    // list from timestep to timestep
" S( d8 l, k; k) m+ j        % J/ q( `! s# E. a, f8 F* m
    // By default, all `createActionForEach' modelActions have" W/ K8 j6 I* V4 @
    // a default order of `Sequential', which means that the
3 ]3 s& R& q- W' x    // order of iteration through the `heatbugList' will be
2 [& B6 n  I. _- |( f    // identical (assuming the list order is not changed
1 t" O# y5 F, w5 f( ^% E* m( d    // indirectly by some other process).
6 y+ q2 t  H# h# W    ) R+ ]/ m5 ~, T0 V; W' Q4 j
    modelActions = new ActionGroupImpl (getZone ());
% X/ O1 i# p) _' g. n: U- Z5 Y7 A- C1 Q2 u5 D& g+ Q
    try {
9 ^; G5 r6 {7 e1 @      modelActions.createActionTo$message; r- ]1 c5 f0 i' Z1 r
        (heat, new Selector (heat.getClass (), "stepRule", false));. ]3 V! M6 Z' p3 F' g4 ^
    } catch (Exception e) {
* `- S5 I5 d/ A# n      System.err.println ("Exception stepRule: " + e.getMessage ());
+ q/ u, @* {5 n8 ?9 X; V    }
# r- ]7 B0 ~. [" Z' y0 M' h
- Z4 C6 |3 b5 c% ~1 @    try {
% r9 `" K$ e3 M5 {) {      Heatbug proto = (Heatbug) heatbugList.get (0);
# e( G: _8 X) X; \3 @0 X      Selector sel = ! o( L7 R+ M" I( E9 o3 Z% ^& d
        new Selector (proto.getClass (), "heatbugStep", false);
" h+ r. i$ p. D3 f      actionForEach =$ E5 a/ V2 M, c& \2 X  A
        modelActions.createFActionForEachHomogeneous$call
) i% E* m( T+ d- l4 |$ J1 R        (heatbugList,
% b: b3 y7 ^7 P2 Z" w4 }4 i9 S( b5 j         new FCallImpl (this, proto, sel,
3 N$ p7 I. t8 T9 l) M" p. o' s                        new FArgumentsImpl (this, sel)));
& ~, C; Y; N2 X' y3 A* T7 T    } catch (Exception e) {1 U& A6 V! l5 H) T; J6 j0 L% Z
      e.printStackTrace (System.err);; N3 n0 m" y' S
    }4 Y' n+ u6 t! }  q* {; t: g" j
      k) F4 q/ Y" S* }
    syncUpdateOrder ();
. z* s4 T7 f0 n7 N( |  `
! r+ ~, y3 }, C" B1 A8 g    try {  k- w0 }9 E4 [8 `2 l, I& d! L
      modelActions.createActionTo$message
4 i& J& H& r$ B5 G* V3 W9 R4 w$ v        (heat, new Selector (heat.getClass (), "updateLattice", false));; H, K. g/ k- x  C9 K
    } catch (Exception e) {& f) }  g2 _. k; b3 t$ Q( J
      System.err.println("Exception updateLattice: " + e.getMessage ());
3 I; R9 A# @5 S$ Y( @8 T$ s" o, B    }
: `1 K; q1 W( I7 f# s        
  Q' m# d8 c* W  U    // Then we create a schedule that executes the% n. g( N: }2 ~: F2 q5 R2 e
    // modelActions. modelActions is an ActionGroup, by itself it) I9 s; X9 y3 o/ E) v) n' Y0 d
    // has no notion of time. In order to have it executed in
: i+ t/ _' S1 f    // time, we create a Schedule that says to use the
( K4 O: a# y% U9 W& U    // modelActions ActionGroup at particular times.  This( ]7 J9 P+ j1 s9 O
    // schedule has a repeat interval of 1, it will loop every
# b! [) e2 p# D: s! M4 H    // time step.  The action is executed at time 0 relative to& L+ l+ y0 c! v* H; w( Q
    // the beginning of the loop.0 Z& Z$ h$ X% e; T8 ~1 S0 |
0 _! Z' X- ^* g- O
    // This is a simple schedule, with only one action that is  d" v$ y: ~. F  z; c: q7 X
    // just repeated every time. See jmousetrap for more
- v6 ^5 r# x% P: n( H) N    // complicated schedules.
; w+ n( k, T" d' B, J  7 E/ `/ b! c* C, |
    modelSchedule = new ScheduleImpl (getZone (), 1);7 m) s* p" E& c3 J5 u
    modelSchedule.at$createAction (0, modelActions);  E. }. m! j$ V8 d
        
* d& c/ e7 Q, I0 h6 W8 t0 t+ @    return this;7 I5 A% G7 E1 j8 J! E+ t
  }
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