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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:5 [9 A' i( X: r9 E
8 M: D* o* _- ?7 I" T" p/ N: c
public Object buildActions () {
& P0 a$ J* t; o9 [    super.buildActions();7 D' O5 J! q$ J8 i: v; \
    : B# _6 t( i, O
    // Create the list of simulation actions. We put these in
9 }- S" w1 y9 S9 b# G7 K, w    // an action group, because we want these actions to be; U# i2 S! q) z9 v1 l! D8 B: |5 I0 u  W
    // executed in a specific order, but these steps should
' R0 u+ ?% g$ w; |% [: v    // take no (simulated) time. The M(foo) means "The message; n& K1 @5 T( o! ?( H
    // called <foo>". You can send a message To a particular
4 {6 n# R: J$ W( J2 J    // object, or ForEach object in a collection.' [1 T# G" o% f- |
        
. c; m( n. Z, j' p2 D; a    // Note we update the heatspace in two phases: first run
. F! ]0 k3 L8 B3 G* A( A) Q    // diffusion, then run "updateWorld" to actually enact the
! f" Q- m, e, Q- S8 `    // changes the heatbugs have made. The ordering here is8 v0 H, m+ X. z5 q2 ^( m  D5 g
    // significant!
; R. f, J- J8 b- Y8 T        + k0 W7 e) r8 u7 O
    // Note also, that with the additional( d1 _9 f" o- U' n$ {
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
' K, R  A: f' F$ B; s- A    // randomize the order in which the bugs actually run
. ?% z( f+ M/ M/ s& p. k    // their step rule.  This has the effect of removing any
1 w$ ]& z# Y) r5 e1 o' o% h    // systematic bias in the iteration throught the heatbug& ], _2 @+ ?: P+ a! m5 x2 e# g9 m
    // list from timestep to timestep8 P$ p  E) M+ Y: z0 Y
        
  ^" U- g: C0 f- Q- ^5 l* Y) i    // By default, all `createActionForEach' modelActions have" c, @7 a# H7 Y
    // a default order of `Sequential', which means that the
. _/ ?5 ]( s4 s: Y/ d6 c& ?& Y    // order of iteration through the `heatbugList' will be
- ?( a9 b- A' _$ g4 @# |. `+ S    // identical (assuming the list order is not changed
6 V* P9 P# j1 W, L+ a    // indirectly by some other process).
! C! |0 V6 X; A. {4 m   
8 m. _- Q" x* n' |0 n' D    modelActions = new ActionGroupImpl (getZone ());
( I: _) n$ r3 x' L: q4 z7 s/ I% _4 f& F1 L; c+ ~5 g/ q7 z
    try {
3 N3 K, C" n. x3 I5 H      modelActions.createActionTo$message% O; u* l2 C/ h4 A" B
        (heat, new Selector (heat.getClass (), "stepRule", false));
" x! i; s0 B: C. V) H% i    } catch (Exception e) {
) C% S' i" b, J- S9 U, k0 Q; h$ H( \      System.err.println ("Exception stepRule: " + e.getMessage ());& g$ L1 c$ u: B7 C
    }1 f8 ~; F' w( j) b; r+ c

1 E8 i( m7 \* M! E    try {
. o) q0 E- Y3 @4 S) S* }( z& z8 V      Heatbug proto = (Heatbug) heatbugList.get (0);
4 t; T  {. U6 i/ ^3 W7 v) M1 g+ E      Selector sel =
3 t0 ?; ?& v( L4 U' V+ ~        new Selector (proto.getClass (), "heatbugStep", false);# ~9 ~' I+ V! Y
      actionForEach =
, H+ f' e! N4 T. `6 h' k8 @        modelActions.createFActionForEachHomogeneous$call0 L( v3 y6 Y- i" e- ^
        (heatbugList,+ K( a9 ^: f/ T3 S5 W# O' L
         new FCallImpl (this, proto, sel,9 G' _1 c; N% s' O
                        new FArgumentsImpl (this, sel)));
/ D8 @( N4 M5 }, W6 }: |    } catch (Exception e) {0 e; R2 \0 D% y( p
      e.printStackTrace (System.err);: ?, O' R* ?' ?
    }
1 `) G: I7 e$ l; W$ X    : v0 Q  n6 T+ ^1 H9 R- p
    syncUpdateOrder ();- V1 W( V/ q9 \/ K: n! ?0 V0 {: B! A
; \% W9 B0 C" p) d- S; ^5 b6 H& P6 C
    try {7 D1 v- Q* L2 R) q, w
      modelActions.createActionTo$message & `' R" Q1 L4 f) \6 D; N6 i/ M
        (heat, new Selector (heat.getClass (), "updateLattice", false));: a! M. X0 F, h7 C
    } catch (Exception e) {
. i  y9 J6 u) u, E) {      System.err.println("Exception updateLattice: " + e.getMessage ());
9 A  D5 _( ^( t, F+ F1 u( i& X    }3 l: Z+ {* l4 b6 l' ]
        
3 Y( V0 J5 K" y6 [    // Then we create a schedule that executes the
* Y' s+ a; G& u  k2 {; N    // modelActions. modelActions is an ActionGroup, by itself it
' `. X3 ?8 @$ J) {9 O    // has no notion of time. In order to have it executed in/ m- Z" y/ ?& G" L* ]' X# X
    // time, we create a Schedule that says to use the
. L& X! s, }+ o/ r    // modelActions ActionGroup at particular times.  This  |& m& @8 N( K7 P8 o/ B
    // schedule has a repeat interval of 1, it will loop every7 b+ D" S* n' l9 {6 F  u7 {
    // time step.  The action is executed at time 0 relative to$ X2 i: m( ]  J' q( a
    // the beginning of the loop." H. W6 k/ l$ [8 j% `
6 Y# }: w" P- ~: I: j  @5 s
    // This is a simple schedule, with only one action that is
( e( @1 u& [$ l0 n- q4 [8 K    // just repeated every time. See jmousetrap for more* n! J0 B3 P$ j# R2 e/ g1 n
    // complicated schedules.+ ]: A6 \0 S1 R$ y1 `
  
4 Y# Z, r' h& @! V! w    modelSchedule = new ScheduleImpl (getZone (), 1);
2 k( O$ e5 H9 U    modelSchedule.at$createAction (0, modelActions);( n( R. t( h  \6 ]- `
        
% Q4 U2 p( s; r( x! m2 S, p9 c    return this;
9 w1 i- L5 }4 r& _  }
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