| [6152] | 1 | /*
|
|---|
| 2 | Copyright 2006 by Sean Luke
|
|---|
| 3 | Licensed under the Academic Free License version 3.0
|
|---|
| 4 | See the file "LICENSE" for more information
|
|---|
| 5 | */
|
|---|
| 6 |
|
|---|
| 7 |
|
|---|
| 8 | package ec;
|
|---|
| 9 |
|
|---|
| 10 | /*
|
|---|
| 11 | * Exchanger.java
|
|---|
| 12 | *
|
|---|
| 13 | * Created: Tue Aug 10 21:59:17 1999
|
|---|
| 14 | * By: Sean Luke
|
|---|
| 15 | */
|
|---|
| 16 |
|
|---|
| 17 | /**
|
|---|
| 18 | * The Exchanger is a singleton object whose job is to (optionally)
|
|---|
| 19 | * perform individual exchanges between subpopulations in the run,
|
|---|
| 20 | * or exchange individuals with other concurrent evolutionary run processes,
|
|---|
| 21 | * using sockets or whatever. Keep in mind that other processes may go down,
|
|---|
| 22 | * or be started up from checkpoints, etc.
|
|---|
| 23 | *
|
|---|
| 24 | * @author Sean Luke
|
|---|
| 25 | * @version 1.0
|
|---|
| 26 | */
|
|---|
| 27 |
|
|---|
| 28 | public abstract class Exchanger implements Singleton
|
|---|
| 29 | {
|
|---|
| 30 | /** Initializes contacts with other processes, if that's what you're doing. Called at the beginning of an evolutionary run, before a population is set up. */
|
|---|
| 31 | public void initializeContacts(EvolutionState state) { }
|
|---|
| 32 |
|
|---|
| 33 | /** Initializes contacts with other processes, if that's what you're doing. Called after restarting from a checkpoint. */
|
|---|
| 34 | public void reinitializeContacts(EvolutionState state) { }
|
|---|
| 35 |
|
|---|
| 36 | /** Performs exchanges after the population has been evaluated but before it has been bred,
|
|---|
| 37 | once every generation (or pseudogeneration). */
|
|---|
| 38 | public abstract Population preBreedingExchangePopulation(EvolutionState state);
|
|---|
| 39 |
|
|---|
| 40 | /** Performs exchanges after the population has been bred but before it has been evaluated,
|
|---|
| 41 | once every generation (or pseudogeneration). */
|
|---|
| 42 | public abstract Population postBreedingExchangePopulation(EvolutionState state);
|
|---|
| 43 |
|
|---|
| 44 | /** Called after preBreedingExchangePopulation(...) to evaluate whether or not
|
|---|
| 45 | the exchanger wishes the run to shut down (with ec.EvolutionState.R_FAILURE) --
|
|---|
| 46 | returns a String (which will be printed out as a message) if the exchanger
|
|---|
| 47 | wants to shut down, else returns null if the exchanger does NOT want to shut down.
|
|---|
| 48 | Why would you want to shut down?
|
|---|
| 49 | This would happen for two reasons. First, another process might have found
|
|---|
| 50 | an ideal individual and the global run is now over. Second, some network
|
|---|
| 51 | or operating system error may have occurred and the system needs to be shut
|
|---|
| 52 | down gracefully. Note that if the exchanger wants to shut down, the system
|
|---|
| 53 | will shut down REGARDLESS of whether or not the user stated
|
|---|
| 54 | ec.EvolutionState.quitOnRunComplete. */
|
|---|
| 55 | public abstract String runComplete(EvolutionState state);
|
|---|
| 56 |
|
|---|
| 57 | /** Closes contacts with other processes, if that's what you're doing. Called at the end of an evolutionary run. result is either ec.EvolutionState.R_SUCCESS or ec.EvolutionState.R_FAILURE, indicating whether or not an ideal individual was found. */
|
|---|
| 58 | public void closeContacts(EvolutionState state, int result) { }
|
|---|
| 59 | }
|
|---|
