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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:: j: F8 }; \/ T
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public Object buildActions () {+ V6 x4 m7 y) `1 v
    super.buildActions();* G0 @8 e& ]+ T+ I
    ' B/ R" {1 C+ \- P; h! m3 d
    // Create the list of simulation actions. We put these in
7 {( g& O: K& q* b. b! ]+ [2 w    // an action group, because we want these actions to be' b9 i" ~* |- m% ^) N
    // executed in a specific order, but these steps should8 L* `) O* g3 e: F1 Y2 h# ~- s
    // take no (simulated) time. The M(foo) means "The message2 T! R! f  x. ^7 l2 x( a8 Y
    // called <foo>". You can send a message To a particular
3 l8 E! a4 M+ k! `0 V    // object, or ForEach object in a collection.8 W2 u: O9 {3 j4 g& ?/ j
        2 g# V' x( R: h2 ]( ~0 P; @
    // Note we update the heatspace in two phases: first run
4 {/ ?( w) R# m- b$ D    // diffusion, then run "updateWorld" to actually enact the! B, M& c- F' I; J
    // changes the heatbugs have made. The ordering here is
1 J8 O4 e9 \8 k    // significant!1 @8 B  U% S. K( r2 h% w6 I
        
* g, m6 U6 i2 T; D/ x0 Q' Y7 X# W3 B    // Note also, that with the additional3 r, V* o3 D4 \3 V& a7 M
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
9 N6 n7 _& {& G. L  s. a    // randomize the order in which the bugs actually run
. c, n3 V7 L2 D    // their step rule.  This has the effect of removing any; g- f* ?, x5 J" _) @
    // systematic bias in the iteration throught the heatbug
9 U/ Q, ?/ y. o7 `    // list from timestep to timestep4 e! M6 N) }9 o. t! l; k6 E
        7 I2 d4 ]. X0 v3 |5 `( h
    // By default, all `createActionForEach' modelActions have6 F7 S' p+ H9 r5 I9 s: j  }
    // a default order of `Sequential', which means that the- \# V0 Y% L8 r! _+ N" r
    // order of iteration through the `heatbugList' will be
; l& V6 m& Q4 E$ c    // identical (assuming the list order is not changed9 B) c3 h7 z; X. v* Q. O7 `( r/ d& H
    // indirectly by some other process).
- b3 Q5 K' ^2 l& U9 `5 j9 R$ y   
  w0 L- S$ R# U; t) Z6 z4 i3 H    modelActions = new ActionGroupImpl (getZone ());0 ]" d3 l" x% k: t/ ?9 u; Z/ D

- z, `4 ]; ?+ k5 e( C# {. \    try {
; n% ~! y* v, y      modelActions.createActionTo$message/ p9 |1 z# R8 d* N, O) \( F
        (heat, new Selector (heat.getClass (), "stepRule", false));
& r1 R3 y7 I- p' o% p; v    } catch (Exception e) {; C8 s2 _# `4 }2 E( ]; e/ y+ k
      System.err.println ("Exception stepRule: " + e.getMessage ());7 o3 H" L9 R) `, H7 [- Y+ d
    }
1 K: i! I  v, Z- S' D8 a
# \" O' E9 f+ M) [/ D    try {
3 ^8 W. O' V+ z4 `8 I! C. s      Heatbug proto = (Heatbug) heatbugList.get (0);8 b0 x# k9 b7 Q  j' x% J- N
      Selector sel = 1 {9 ~% [9 T+ m8 G, w' s# `
        new Selector (proto.getClass (), "heatbugStep", false);* Q) G* l  E: Q8 t9 _* B( T* ^
      actionForEach =( W/ d& I5 r: r# p' c, [- i
        modelActions.createFActionForEachHomogeneous$call
- T6 [* L2 g: P; O/ B" h& l& G        (heatbugList,
2 d- F! R/ N* B# a3 A; n         new FCallImpl (this, proto, sel,
; Y$ l/ F2 D8 j+ T                        new FArgumentsImpl (this, sel)));: G* t9 j* Y& }! y! f& A! S' I9 W
    } catch (Exception e) {! K4 Q; O) c9 V* O& C" Z+ J
      e.printStackTrace (System.err);
9 D1 K! g. G& x% F7 E    }
9 t* Q0 H$ ~7 a, x. o# ^    / j( N: D) N3 f! Z+ z$ ^
    syncUpdateOrder ();
8 v% |- H/ G6 C0 j0 t+ u7 F8 c
1 Y# s2 p# x1 h4 Q* k    try {
% {# n7 G* G# h      modelActions.createActionTo$message
, j( H# l4 Y, A: r        (heat, new Selector (heat.getClass (), "updateLattice", false));
6 Y5 d- A; c) P+ |# H  x4 n5 a$ B- R    } catch (Exception e) {7 S# B" \# b( x7 m
      System.err.println("Exception updateLattice: " + e.getMessage ());
* k5 Y- @( F0 |3 s8 W/ |    }
# X# u8 U9 T0 y- S) p9 v3 ~        1 r. v$ I- u2 G3 C6 q2 a' L/ N
    // Then we create a schedule that executes the( ]( k; [: k: ~( ^* |0 [5 V1 Y! |( S
    // modelActions. modelActions is an ActionGroup, by itself it& k1 n" }: n( l% C
    // has no notion of time. In order to have it executed in
/ g( h- m+ _! ?4 {    // time, we create a Schedule that says to use the6 F7 S/ `0 F4 u
    // modelActions ActionGroup at particular times.  This4 P3 }) Z" _$ E! q2 ^
    // schedule has a repeat interval of 1, it will loop every: B2 |; m6 i1 g: O
    // time step.  The action is executed at time 0 relative to
+ `9 F0 B2 I: p- L- w4 G* i    // the beginning of the loop.
: Q' g6 k% {& {/ R; P/ f7 E& g8 Z0 W; T- |
    // This is a simple schedule, with only one action that is. L9 J# w) Q+ r/ x
    // just repeated every time. See jmousetrap for more8 b" A, U- V: R  ]
    // complicated schedules.1 v4 f4 ]$ o2 W1 o; I  B
  
# o. |  A0 b0 `  ]) v# Y0 a    modelSchedule = new ScheduleImpl (getZone (), 1);
# u6 m% q- K! Y3 ?    modelSchedule.at$createAction (0, modelActions);* `6 l: x6 j) K) w
        
1 E& _8 K* ^; l4 Y: }2 J; b1 a    return this;7 Z+ F/ K, u1 j: F9 P
  }
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