ec
Class Exchanger
java.lang.Object
|
+--ec.Exchanger
- All Implemented Interfaces:
- java.io.Serializable, Setup, Singleton
- Direct Known Subclasses:
- InterPopulationExchange, IslandExchange, SimpleExchanger
- public abstract class Exchanger
- extends java.lang.Object
- implements Singleton
The Exchanger is a singleton object whose job is to (optionally)
perform individual exchanges between subpopulations in the run,
or exchange individuals with other concurrent evolutionary run processes,
using sockets or whatever. Keep in mind that other processes may go down,
or be started up from checkpoints, etc.
- See Also:
- Serialized Form
Method Summary |
abstract void |
closeContacts(EvolutionState state,
int result)
Closes contacts with other processes, if that's what you're doing. |
abstract void |
initializeContacts(EvolutionState state)
Initializes contacts with other processes, if that's what you're doing. |
abstract Population |
postBreedingExchangePopulation(EvolutionState state)
Performs exchanges after the population has been bred but before it has been evaluated,
once every generation (or pseudogeneration). |
abstract Population |
preBreedingExchangePopulation(EvolutionState state)
Performs exchanges after the population has been evaluated but before it has been bred,
once every generation (or pseudogeneration). |
abstract void |
reinitializeContacts(EvolutionState state)
Initializes contacts with other processes, if that's what you're doing. |
abstract java.lang.String |
runComplete(EvolutionState state)
Called after preBreedingExchangePopulation(...) to evaluate whether or not
the exchanger wishes the run to shut down (with ec.EvolutionState.R_FAILURE) --
returns a String (which will be printed out as a message) if the exchanger
wants to shut down, else returns null if the exchanger does NOT want to shut down. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Exchanger
public Exchanger()
initializeContacts
public abstract void initializeContacts(EvolutionState state)
- 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.
reinitializeContacts
public abstract void reinitializeContacts(EvolutionState state)
- Initializes contacts with other processes, if that's what you're doing. Called after restarting from a checkpoint.
preBreedingExchangePopulation
public abstract Population preBreedingExchangePopulation(EvolutionState state)
- Performs exchanges after the population has been evaluated but before it has been bred,
once every generation (or pseudogeneration).
postBreedingExchangePopulation
public abstract Population postBreedingExchangePopulation(EvolutionState state)
- Performs exchanges after the population has been bred but before it has been evaluated,
once every generation (or pseudogeneration).
runComplete
public abstract java.lang.String runComplete(EvolutionState state)
- Called after preBreedingExchangePopulation(...) to evaluate whether or not
the exchanger wishes the run to shut down (with ec.EvolutionState.R_FAILURE) --
returns a String (which will be printed out as a message) if the exchanger
wants to shut down, else returns null if the exchanger does NOT want to shut down.
Why would you want to shut down?
This would happen for two reasons. First, another process might have found
an ideal individual and the global run is now over. Second, some network
or operating system error may have occurred and the system needs to be shut
down gracefully. Note that if the exchanger wants to shut down, the system
will shut down REGARDLESS of whether or not the user stated
ec.EvolutionState.quitOnRunComplete.
closeContacts
public abstract void closeContacts(EvolutionState state,
int result)
- 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.