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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:0 p9 A6 B6 S8 F) _* v

- K6 ?) T/ B1 n  j1 ^3 j4 | public Object buildActions () {
4 P; d' S4 z! ~5 w" }    super.buildActions();
& o3 s* r; j0 p# M# r: Z; ]   
( O, d/ |+ B& |  F    // Create the list of simulation actions. We put these in
9 P1 T; M* z! p  N, Z" ?    // an action group, because we want these actions to be
# w" u3 ^- ?% R$ z! y, l+ f& a6 L    // executed in a specific order, but these steps should9 V8 g+ V, p1 v1 m  i' k- ]% B
    // take no (simulated) time. The M(foo) means "The message
4 u4 R5 Y4 R, A. F" u* N    // called <foo>". You can send a message To a particular
3 F* ?4 X2 z0 n2 ]3 {    // object, or ForEach object in a collection.
3 m/ d1 Q; E# N5 M/ q        
1 v/ e7 Y* ^( b( b    // Note we update the heatspace in two phases: first run4 P6 f9 K1 Q( O2 ~. I" {
    // diffusion, then run "updateWorld" to actually enact the; E! [4 }0 q4 `! ?) l
    // changes the heatbugs have made. The ordering here is: _, C" ]& Y$ D* {: X
    // significant!
3 ?9 Z- N( n7 S  J        
, c6 }9 }! H/ d, ^; t- W; ]% x    // Note also, that with the additional
3 u9 F5 G+ k8 z    // `randomizeHeatbugUpdateOrder' Boolean flag we can: i  [* L; H8 G) H& L7 N
    // randomize the order in which the bugs actually run. r9 H3 k6 }# y' H  _# I: x# O
    // their step rule.  This has the effect of removing any1 W: ^& ~9 f' T! G2 }: d0 L* y
    // systematic bias in the iteration throught the heatbug
% y" F1 X( c) W! d4 ?3 ^! v/ Y    // list from timestep to timestep& Z8 u/ \  F  l8 T  v: W- s: T( b
        0 C" K! B7 f, E: {3 @* K. ~
    // By default, all `createActionForEach' modelActions have; J- ?6 J' ~: B; L5 s7 y; {. I
    // a default order of `Sequential', which means that the6 d, p0 u; M- o  s
    // order of iteration through the `heatbugList' will be1 Z! j! H6 \7 Q
    // identical (assuming the list order is not changed
& t9 X( W/ }: m! n5 I' `4 T    // indirectly by some other process).
0 F2 L0 g* `# u" m5 ]7 u7 P    $ C2 k) A- X. e, b# B* ~1 Y% M: `. f
    modelActions = new ActionGroupImpl (getZone ());
6 ~/ z; _3 H) v( K- O; s! I0 }) Z: D- Y" W+ i7 q
    try {+ Z0 e4 l# u0 B) a1 B
      modelActions.createActionTo$message
% a& V1 w  ?6 o0 E/ m7 _        (heat, new Selector (heat.getClass (), "stepRule", false));# F# }' z8 s4 q1 |& Q! E/ y' y- T
    } catch (Exception e) {3 o5 Q# l7 V0 J* L
      System.err.println ("Exception stepRule: " + e.getMessage ());
# P# F0 S/ y9 x4 p& `    }" x/ q2 c6 p( N
* \: K4 V/ s+ Z/ u+ M/ r2 H
    try {2 a4 l% Y6 i4 m* u" |% }
      Heatbug proto = (Heatbug) heatbugList.get (0);8 t. s1 c% g, y5 C
      Selector sel = 0 u; x( t$ f/ C+ b' k# U: ^  u
        new Selector (proto.getClass (), "heatbugStep", false);
3 o& ~3 q/ n3 m5 p" F' _  k; V      actionForEach =
2 U1 y* C: ~$ R7 ~& u        modelActions.createFActionForEachHomogeneous$call
6 {: x3 p$ T6 J+ k3 e7 N        (heatbugList,
/ R& d& T7 S  H         new FCallImpl (this, proto, sel,) N1 ?1 P% m- u& i
                        new FArgumentsImpl (this, sel)));  ]% W& a3 m' N" B) V- A
    } catch (Exception e) {; y4 @. U# Q: b& t  H( n
      e.printStackTrace (System.err);
% i3 K* I; w6 S7 J/ n    }* b3 w& ]- L# p
    3 x- ~7 z% ]! T# X$ a
    syncUpdateOrder ();2 v; I, e% C' U6 \: H

3 j* C% j2 Y) I, J9 N& p$ A    try {
0 s. e+ |$ W$ |& x( g) V      modelActions.createActionTo$message + n0 g9 S* n  M) {
        (heat, new Selector (heat.getClass (), "updateLattice", false));0 Y% p) H. d2 Y  h! n
    } catch (Exception e) {9 [5 D/ z$ `& i% i0 `8 [* H7 w# \
      System.err.println("Exception updateLattice: " + e.getMessage ());4 [3 v: y0 _7 z0 }
    }
, N: D3 i2 Z4 \8 H' c3 T        ! Z# A* a! k1 Z# D9 {4 c
    // Then we create a schedule that executes the2 w. R& C6 d- y3 i% }1 Y
    // modelActions. modelActions is an ActionGroup, by itself it
% m, I: h) R1 `4 r! Y. v    // has no notion of time. In order to have it executed in# U; j- t+ a2 p5 d$ s5 e2 s
    // time, we create a Schedule that says to use the( j3 z- n; n0 o7 W
    // modelActions ActionGroup at particular times.  This( B8 O2 x/ _  r/ s6 {) a) I
    // schedule has a repeat interval of 1, it will loop every( H  O! q7 D- \; t: Q, W3 e: w7 I
    // time step.  The action is executed at time 0 relative to9 l- d$ H) G9 ]4 I# U5 ?
    // the beginning of the loop.
; c8 x% W/ h, Q; h+ C+ Y2 t
3 \" }$ r) Y& G% z0 c. r3 i    // This is a simple schedule, with only one action that is  F" K- q" u, f
    // just repeated every time. See jmousetrap for more
* a" Y# p. s! g4 r  N. }; h    // complicated schedules.# u2 u" z+ T( W% r8 Q/ e* m
  
. e$ Q! A. u8 X' x  O! H    modelSchedule = new ScheduleImpl (getZone (), 1);
* M8 J* D+ H# r7 f; S: W    modelSchedule.at$createAction (0, modelActions);
5 b' v4 o/ D4 N+ u, z$ V0 [5 C        ) ?% M6 R0 M: B4 J+ B
    return this;
: G: y: G7 @4 ]8 V# s' }: W  }
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