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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:' \& Y" o  a3 F1 ]  w- b0 W
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public Object buildActions () {. H( S! t0 B$ x; y$ W
    super.buildActions();
: \0 c# `# g# V$ |- M   
3 K* `7 }/ b4 @1 E' x$ ~' J! `    // Create the list of simulation actions. We put these in. b, P* }. q0 p- ?0 r
    // an action group, because we want these actions to be
- |6 ^4 A- @0 }, g+ G    // executed in a specific order, but these steps should2 |- ?8 p, H8 ^. x7 [$ |4 o
    // take no (simulated) time. The M(foo) means "The message
# Z! O! H# x) C    // called <foo>". You can send a message To a particular
: l& F7 @  }8 `/ |& g; V2 \    // object, or ForEach object in a collection.
5 E1 `1 J, U  q& C6 v$ M; q5 `0 W) a        8 a8 W% y& c4 W% d3 {1 O% y
    // Note we update the heatspace in two phases: first run
+ m5 d) a( b6 @" O# O0 y# O- u    // diffusion, then run "updateWorld" to actually enact the5 N3 f! C6 ]; C$ \" o
    // changes the heatbugs have made. The ordering here is/ T$ n# l  I+ y! j# e; H# k
    // significant!
) p, Y) Y- Q- f2 w7 P        
1 E  p. o% h2 t8 L    // Note also, that with the additional
/ Z/ b1 M7 Y* M/ y8 I2 u    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 [+ Q, t1 \$ [7 d7 r5 S: A
    // randomize the order in which the bugs actually run
7 ]% T6 @( w0 M' `* X; j. B    // their step rule.  This has the effect of removing any
3 Q- H8 v9 j& C) d2 L1 V    // systematic bias in the iteration throught the heatbug$ |( T5 G1 \$ P" D5 L4 a8 b
    // list from timestep to timestep8 W' [* T0 ^( |! ~  o6 @. V
        / f! E6 a7 R4 J' N- u
    // By default, all `createActionForEach' modelActions have  s1 x2 Y0 d- k8 h8 F- z
    // a default order of `Sequential', which means that the
: F# U5 A  C. b7 t  m# t    // order of iteration through the `heatbugList' will be7 ~& J: k) F; i9 V2 i
    // identical (assuming the list order is not changed1 j. H% Y( G* a. `  V1 X! k; g! e4 I
    // indirectly by some other process).
0 S$ R) O) H# X3 i$ X   
  Y1 g0 `) e5 m+ I    modelActions = new ActionGroupImpl (getZone ());
# \7 h; x# f( t% l& s3 X4 k" J1 f  u, B! k+ O) t6 u/ ~2 \; m) s
    try {
  E$ F; w( X' E; Z7 u      modelActions.createActionTo$message
3 d- H3 k, c% }* E        (heat, new Selector (heat.getClass (), "stepRule", false));
! R1 h1 ^9 A( b  J7 j  j! y    } catch (Exception e) {, v4 }' N/ V6 [% n! z+ N* O
      System.err.println ("Exception stepRule: " + e.getMessage ());; u: d; W8 ^% [, J: w0 J0 e
    }7 m+ L' Y3 Q6 \/ [

4 {9 }. @5 r& u$ F5 W    try {$ ^: v2 f  a; T4 L  j7 u; `) @
      Heatbug proto = (Heatbug) heatbugList.get (0);
- o3 |7 w& F/ o- K      Selector sel = 2 l- i& z4 X9 q: ]# C0 ]
        new Selector (proto.getClass (), "heatbugStep", false);. d9 X! W- C: L/ z# h" \
      actionForEach =
  {; T9 k6 J# t/ x2 A        modelActions.createFActionForEachHomogeneous$call- _' L" v! C* i9 W! M
        (heatbugList,
1 L& z, c1 I( w9 y         new FCallImpl (this, proto, sel,2 n3 K0 |: @* o. t
                        new FArgumentsImpl (this, sel)));& @) n- U& V  ^& y
    } catch (Exception e) {
1 W, i7 d3 q9 s6 a  x0 B0 {      e.printStackTrace (System.err);
$ U! j( |, F1 |9 F    }
6 A8 x  F: C. q# N% q) X0 V   
3 K) M4 z& @0 M0 _% a    syncUpdateOrder ();- J$ {% E" W( H) |0 L' P1 |

% {0 _% ]) Z" x$ w: n    try {7 J, `9 p; g- H& a7 B
      modelActions.createActionTo$message " I4 a3 @# [' b! \
        (heat, new Selector (heat.getClass (), "updateLattice", false));
( F. L. d7 x+ H% Q    } catch (Exception e) {# D* Y4 g* W% Z* D# \# [% m' e
      System.err.println("Exception updateLattice: " + e.getMessage ());
) ~- l# \& S3 l3 U( w6 S' Z    }
) t* R& }* Z7 H3 Y8 R8 ?' [1 t9 A3 H        5 p! w5 W6 M) a. x
    // Then we create a schedule that executes the0 n1 R+ h& Q6 f7 J) Y
    // modelActions. modelActions is an ActionGroup, by itself it
1 A  x7 O1 b5 w! d5 M    // has no notion of time. In order to have it executed in; _4 E0 Q7 |+ H+ n
    // time, we create a Schedule that says to use the$ H/ S. j$ ~3 ]: }- J) Y. w' q) y
    // modelActions ActionGroup at particular times.  This
( q- }* H( Z% A! N: l    // schedule has a repeat interval of 1, it will loop every
- p5 ?2 D% j/ Q4 L& r( N" w7 A    // time step.  The action is executed at time 0 relative to7 g# N6 F0 J6 H# o: R& f
    // the beginning of the loop.
" S0 o  p0 B- m8 E' J
7 H3 |& I$ U6 V% G) `    // This is a simple schedule, with only one action that is
. F( c' C, v3 C4 N& U* \    // just repeated every time. See jmousetrap for more0 N6 j" z0 Y7 B% _/ O
    // complicated schedules.
, K8 f" q9 T8 o" P! F/ V  
3 G  g" T# X' u6 N# X  N    modelSchedule = new ScheduleImpl (getZone (), 1);8 v6 p& J2 |7 ~* P, |
    modelSchedule.at$createAction (0, modelActions);$ c) }$ u, [% V, h& \7 \
        
/ v: o; C" {4 P; ~3 U    return this;
- @; J3 G9 X* r& Z/ D* I  }
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