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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:
4 R% s# l! C, t  U
2 _1 q0 b4 Z4 D, l1 n public Object buildActions () {9 ]3 a5 ^$ ?$ \% [4 ]/ R0 I
    super.buildActions();: T( Z, p" D. Y( E9 |
   
8 U% q; Z( A  ?- b    // Create the list of simulation actions. We put these in* j1 B( d8 T, A- _8 b4 b! u+ ]
    // an action group, because we want these actions to be% j- [8 \0 W/ T1 h: i( d, w
    // executed in a specific order, but these steps should
3 o3 l, \# I9 R7 l: W    // take no (simulated) time. The M(foo) means "The message/ N+ g! z  N: C% |! q
    // called <foo>". You can send a message To a particular
# k# j( b+ g# \" |, P    // object, or ForEach object in a collection." j: a0 p0 J8 S1 `
        + ^5 g& B" o  M; \
    // Note we update the heatspace in two phases: first run: h$ n) Z4 H$ v
    // diffusion, then run "updateWorld" to actually enact the
% I: I  Q2 i0 g0 o4 @% S    // changes the heatbugs have made. The ordering here is
0 Y* W( [6 d4 i2 a8 q, \    // significant!" m+ i0 r" z' q7 k/ ]- O4 v6 a# B
        
! u5 E$ d& d4 i3 }/ `9 M6 ?& ^    // Note also, that with the additional
$ i/ U5 b7 p  s    // `randomizeHeatbugUpdateOrder' Boolean flag we can, ]6 f7 h! h; ^& L0 F7 a* c2 C
    // randomize the order in which the bugs actually run; W4 w# T  m8 x% C' w! [6 q
    // their step rule.  This has the effect of removing any
- F/ {' `  t# f( O8 r$ p7 P) s    // systematic bias in the iteration throught the heatbug) G5 D6 v8 R0 C; X( e
    // list from timestep to timestep
! u# v2 l' u# @' P+ ]" w        
0 x' v; _+ B' u! S' x0 [/ B. [1 S- p6 R    // By default, all `createActionForEach' modelActions have0 r6 M+ g6 K( ^" i
    // a default order of `Sequential', which means that the
9 j" ]1 [1 G+ f9 b$ E    // order of iteration through the `heatbugList' will be
9 N( K8 d& ^5 j( }$ Z5 k: [1 c    // identical (assuming the list order is not changed# y% k" [3 p6 l7 m# S
    // indirectly by some other process).
) Y/ k8 @9 L5 P# L( e- w$ E    0 u, d4 `2 D. O% [% Y% l
    modelActions = new ActionGroupImpl (getZone ());% W3 w( k0 k8 U5 d4 U! |

) t% K+ I8 ~3 F, b; i) \2 X* @    try {
" c; D/ P" o+ m. _- X( L1 p. i      modelActions.createActionTo$message
  }/ e* o" n0 A- G8 F6 v4 n        (heat, new Selector (heat.getClass (), "stepRule", false));9 Z& K: y$ E; `6 N) b
    } catch (Exception e) {
- k  g1 E0 I& O0 n- X6 C$ t" b& W  Z      System.err.println ("Exception stepRule: " + e.getMessage ());
2 ]  b, K1 ^* ?  l9 a' [8 }$ v0 Z    }  \- [+ X  c' @" e8 P+ A1 V% J

7 V5 s! D* V) N8 ^! t    try {
' F% ]7 C4 P- m5 o% K. p" H0 i      Heatbug proto = (Heatbug) heatbugList.get (0);: _7 c. j8 c4 O# M  ]5 |1 O
      Selector sel =
( y$ T6 U9 b8 S9 [1 W        new Selector (proto.getClass (), "heatbugStep", false);& Y' B- E+ C8 p4 S# @
      actionForEach =
) c4 Z* W8 d  \" n$ I% N/ L& Y3 h        modelActions.createFActionForEachHomogeneous$call
8 {: u. O0 h& Y        (heatbugList,. c2 w! J0 p7 X4 x" w
         new FCallImpl (this, proto, sel,1 w. M: _# q8 z$ N
                        new FArgumentsImpl (this, sel)));( l# H7 ?& |' \/ Z1 e( i
    } catch (Exception e) {
9 @& K( h: G* Y9 N7 B1 o  a) D      e.printStackTrace (System.err);% A) r6 i6 w" u, V" l, X
    }$ O+ m% M" W% P. G4 U  C
    2 s- u- T, N) o
    syncUpdateOrder ();
9 |- F6 T& ^  z* f- E3 x( y
1 o3 \3 X5 j8 O) ?" E; T: n    try {, z8 s3 A  M! ^5 ^: @% w
      modelActions.createActionTo$message
. _6 ^5 Q4 Y7 a6 V/ ~        (heat, new Selector (heat.getClass (), "updateLattice", false));. J# H1 P6 F+ P
    } catch (Exception e) {
: J; m6 v* d% |4 G: s) X( S      System.err.println("Exception updateLattice: " + e.getMessage ());% T/ Q3 s9 \% U% d1 R& s, [- O
    }# Z" s( C6 ]/ N7 V  j
        ! p5 M( T7 U) v
    // Then we create a schedule that executes the6 k" Q! L4 Y0 C  Q/ J+ r
    // modelActions. modelActions is an ActionGroup, by itself it& E3 t2 E; n+ `
    // has no notion of time. In order to have it executed in  r7 T1 u& f; o* o: ^, j) E
    // time, we create a Schedule that says to use the  E) r' x8 Z  B1 I) |" s! t; G8 Z3 m
    // modelActions ActionGroup at particular times.  This1 \$ ~) }5 D- a$ P
    // schedule has a repeat interval of 1, it will loop every4 b2 @$ @  ^3 X0 p+ l
    // time step.  The action is executed at time 0 relative to
3 z* v, S; M/ y0 T4 @    // the beginning of the loop.
" w4 Z0 W  H* q6 z* l/ E
! {; B5 G) v  H) j    // This is a simple schedule, with only one action that is
  U: |! z8 Z) G    // just repeated every time. See jmousetrap for more
4 O) Z# n; b5 T    // complicated schedules., K# V1 L, {( m& R9 ?. g
  ' `# l, _4 _( H
    modelSchedule = new ScheduleImpl (getZone (), 1);
5 F9 M# B! i( O( J$ t    modelSchedule.at$createAction (0, modelActions);
0 X3 T* O7 b2 Q% q9 T" g        
1 c; J+ z4 `5 `/ o    return this;0 m( a* u1 o; M3 W
  }
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