de.learnlib.filter.cache.mealy

Class SymbolQueryCache<I,O>

java.lang.Object

de.learnlib.filter.cache.mealy.SymbolQueryCache<I,O>

Type Parameters:

I - input alphabet type

O - output alphabet type

All Implemented Interfaces:

MembershipOracle<I,Word<O>>, MembershipOracle.MealyMembershipOracle<I,O>, QueryAnswerer<I,Word<O>>, SymbolQueryOracle<I,O>, Resumable<SymbolQueryCache.SymbolQueryCacheState<I,O>>, LearningCache<MealyMachine<?,I,?,O>,I,Word<O>>, LearningCache.MealyLearningCache<I,O>, LearningCacheOracle<MealyMachine<?,I,?,O>,I,Word<O>>, LearningCacheOracle.MealyLearningCacheOracle<I,O>

public class SymbolQueryCache<I,O>
extends Object
implements SymbolQueryOracle<I,O>, LearningCacheOracle.MealyLearningCacheOracle<I,O>, Resumable<SymbolQueryCache.SymbolQueryCacheState<I,O>>

A cache for a SymbolQueryOracle. Upon construction, it is provided with a delegate oracle. Queries that can be answered from the cache are answered directly, others are forwarded to the delegate oracle. Queried symbols that have to be delegated are incorporated into the cache directly.

Internally, an incrementally growing tree (in form of a mealy automaton) is used for caching.

Author:

frohme

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SymbolQueryCache.SymbolQueryCacheState<I,O>

Nested classes/interfaces inherited from interface de.learnlib.filter.cache.LearningCacheOracle

LearningCacheOracle.DFALearningCacheOracle<I>, LearningCacheOracle.MealyLearningCacheOracle<I,O>

Nested classes/interfaces inherited from interface de.learnlib.filter.cache.LearningCache

LearningCache.DFALearningCache<I>, LearningCache.MealyLearningCache<I,O>

Nested classes/interfaces inherited from interface de.learnlib.api.oracle.MembershipOracle

MembershipOracle.DFAMembershipOracle<I>, MembershipOracle.MealyMembershipOracle<I,O>

Constructor Summary

Constructors

Constructor and Description
SymbolQueryCache(SymbolQueryOracle<I,O> delegate, Alphabet<I> alphabet)

Method Summary

Modifier and Type	Method and Description
@Nullable EquivalenceOracle<MealyMachine<?,I,?,O>,I,Word<O>>	createCacheConsistencyTest() Creates a cache consistency test.
O	query(I i)
void	reset()
void	resume(SymbolQueryCache.SymbolQueryCacheState<I,O> state)
SymbolQueryCache.SymbolQueryCacheState<I,O>	suspend()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface de.learnlib.api.oracle.SymbolQueryOracle

processQueries

Methods inherited from interface de.learnlib.api.oracle.MembershipOracle

answerQuery, answerQuery, asOracle, processQuery

Constructor Detail

SymbolQueryCache

public SymbolQueryCache(SymbolQueryOracle<I,O> delegate,
                        Alphabet<I> alphabet)

Method Detail

query

public O query(I i)

Specified by:

query in interface SymbolQueryOracle<I,O>

reset

public void reset()

Specified by:

reset in interface SymbolQueryOracle<I,O>

createCacheConsistencyTest

public @Nullable EquivalenceOracle<MealyMachine<?,I,?,O>,I,Word<O>> createCacheConsistencyTest()

Description copied from interface: LearningCache

Creates a cache consistency test. A cache consistency test is an equivalence oracle which checks a given hypothesis against the current contents of the cache. Hence, no queries are posed to the underlying system.

The created cache consistency test is backed by the cache contents. This method does not need to be invoked repeatedly when the cache contents change.

Specified by:

createCacheConsistencyTest in interface LearningCache<MealyMachine<?,I,?,O>,I,Word<O>>

Returns:

a cache consistency test for the contents of this cache

suspend

public SymbolQueryCache.SymbolQueryCacheState<I,O> suspend()

Specified by:

suspend in interface Resumable<SymbolQueryCache.SymbolQueryCacheState<I,O>>

resume

public void resume(SymbolQueryCache.SymbolQueryCacheState<I,O> state)

Specified by:

resume in interface Resumable<SymbolQueryCache.SymbolQueryCacheState<I,O>>