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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:
+ B9 m. p. Y$ \$ g+ U. `* M- K
6 \9 K8 {: Y% L, K public Object buildActions () {) A/ z& |& y' A& u9 h
    super.buildActions();& K  o* G; m. N- D
   
7 F# k  \* X8 \* l/ ^    // Create the list of simulation actions. We put these in
/ k6 r; o- O" R& P- ~    // an action group, because we want these actions to be
; n/ E+ d# R, p1 B+ N    // executed in a specific order, but these steps should; d" u- Y! y& X. O* V6 K* W5 y
    // take no (simulated) time. The M(foo) means "The message( W$ j& M: k; B& p. @
    // called <foo>". You can send a message To a particular
3 Y; }& `% L3 i; b9 C. b    // object, or ForEach object in a collection.
! |! p; m; y# ?# G+ \" o        
  w2 n+ \, z# Z6 |0 E: B9 m& S    // Note we update the heatspace in two phases: first run
' M9 G' ]; J: ?; D6 x    // diffusion, then run "updateWorld" to actually enact the1 @3 Z2 O, y$ Q7 ], G- e+ T
    // changes the heatbugs have made. The ordering here is
$ S# v5 m# e2 K" |/ [3 S    // significant!' L9 p! B: y7 N7 c% |/ \. y
        
# G) G2 _1 U1 q) |9 |! [# R& T* x    // Note also, that with the additional
2 D% h; g, Z/ t1 C" v9 W- P3 s$ c    // `randomizeHeatbugUpdateOrder' Boolean flag we can6 q6 o" d/ Z0 q" k3 e
    // randomize the order in which the bugs actually run
, N4 T) j( t* f9 t, g: S    // their step rule.  This has the effect of removing any& m& d7 P  U0 V: q; a2 e
    // systematic bias in the iteration throught the heatbug) i/ }' r  R- @3 G( k8 D+ n
    // list from timestep to timestep
5 X$ h  i. h, I; k2 k; m        
, ~$ z3 x* |+ d3 S; L    // By default, all `createActionForEach' modelActions have3 I! G! ~3 e0 ?$ ]$ ?$ @! Z( E
    // a default order of `Sequential', which means that the
& Q# {8 H- a0 P1 c: K7 O0 ?    // order of iteration through the `heatbugList' will be
: T$ W3 x' `' [( F    // identical (assuming the list order is not changed
) a$ q& C: t, R- z. Y# ]/ U: R' r8 J( |    // indirectly by some other process).4 |; a; S+ d; I2 T
   
# U5 S9 A; k2 y    modelActions = new ActionGroupImpl (getZone ());# E" _* E1 V5 U7 l' ?1 o/ a5 `9 i  x

+ v7 @; t0 v9 B; ^' m/ e/ ^    try {% e7 e7 I% v2 _: P  l+ _/ F& {
      modelActions.createActionTo$message# }  `5 X5 U& ?  \6 W) V- L* n
        (heat, new Selector (heat.getClass (), "stepRule", false));
* Z6 R( L9 @) i1 ?, ]    } catch (Exception e) {
2 }. N+ R1 Y* [1 e. B2 q! k6 b      System.err.println ("Exception stepRule: " + e.getMessage ());! K- \* Q( c- \8 L+ k
    }
# a; f3 G! h; B- X# b9 [1 l! k" L. B3 K4 h  ?. C% B; X. j
    try {9 C2 ]3 ~; \( x1 S  M( R7 ?, b+ j
      Heatbug proto = (Heatbug) heatbugList.get (0);
$ ]1 w2 ^2 E& ?" @; p# f6 |      Selector sel =
4 T$ ?" y  ]! H" ~$ N        new Selector (proto.getClass (), "heatbugStep", false);
+ u, J& S% l- \! C: s! W# ^      actionForEach =0 r  X8 d) g1 n  n/ p4 f0 F; V
        modelActions.createFActionForEachHomogeneous$call
( F3 y5 H' g8 h$ Z) K, \1 Z        (heatbugList,
# ?; B6 p0 n' C# g8 U( j         new FCallImpl (this, proto, sel,; m5 y" q) h8 s. h5 b0 y
                        new FArgumentsImpl (this, sel)));8 {+ n. v" M  R  i( t- L  ~
    } catch (Exception e) {
" {) n. N. S* T% `: ~$ y5 G      e.printStackTrace (System.err);
8 q& K" `) O9 O    }
2 w1 `& {$ X* c* V! J2 v    ! L0 D5 U, i# }) p7 `2 A' I
    syncUpdateOrder ();9 X7 h2 T  x! I7 o& T; ~, O
5 ^( h7 C0 H7 z7 z8 V
    try {; [* m. B8 o, R) ?6 Q3 U
      modelActions.createActionTo$message & v2 L0 o( C/ O' _
        (heat, new Selector (heat.getClass (), "updateLattice", false));
5 L  o0 f; a- v9 L# O    } catch (Exception e) {$ K! ~; ?- J. C( x/ P
      System.err.println("Exception updateLattice: " + e.getMessage ());
5 A0 h" }* _* N2 e. T    }
$ b0 T) S( F, A2 q. r! D$ |7 A# `        % C- B, X, M, ?) X
    // Then we create a schedule that executes the0 H! [" [9 v) s
    // modelActions. modelActions is an ActionGroup, by itself it3 Y6 S: V' y# T$ q
    // has no notion of time. In order to have it executed in* f, \* A  j, C/ N; U; K2 n
    // time, we create a Schedule that says to use the' v. K, \" y' ]; Q4 E; Y* M
    // modelActions ActionGroup at particular times.  This+ a2 o, j- X' a7 e. ^! d9 `
    // schedule has a repeat interval of 1, it will loop every
: A) S, o/ a. M1 z1 V$ K    // time step.  The action is executed at time 0 relative to5 q  b6 N& q" i* H
    // the beginning of the loop.
; O6 O1 i1 P3 B2 P5 L: g/ v) ^! G% I4 d5 {" Y/ t3 Y
    // This is a simple schedule, with only one action that is
! d3 c; N$ w1 @3 i. f5 \( p    // just repeated every time. See jmousetrap for more
, @$ F7 J9 T$ Z3 `    // complicated schedules.
% v% _- q# T. Q  3 `0 v2 q& ^! \* W
    modelSchedule = new ScheduleImpl (getZone (), 1);8 A; G5 G6 Z! L8 i
    modelSchedule.at$createAction (0, modelActions);
4 c: D/ b' G9 O$ f0 ^7 k4 H; `        - S8 n8 O% x* |* ~
    return this;8 ?7 K- G( N& R, j: W4 j, |
  }
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