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Remove unnecessary extra cache in ContextManager

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Luck 2017-08-02 21:48:22 +01:00
parent 8618a67e2e
commit 3d2115ff3c
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2 changed files with 80 additions and 34 deletions
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112
common/src/main/java/me/lucko/luckperms/common/contexts/ContextManager.java
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@ -29,7 +29,6 @@ import lombok.NonNull;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import com.github.benmanes.caffeine.cache.RemovalListener;
import me.lucko.luckperms.api.Contexts;
import me.lucko.luckperms.api.context.ContextCalculator;
@ -40,56 +39,75 @@ import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
/**
* Manages {@link ContextCalculator}s, and calculates applicable contexts for a
* given type.
*
* @param <T> the calculator type
*/
public abstract class ContextManager<T> {
private final List<ContextCalculator<T>> calculators = new CopyOnWriteArrayList<>();
private final List<ContextCalculator<?>> staticCalculators = new CopyOnWriteArrayList<>();
private final LoadingCache<T, ImmutableContextSet> activeContextCache = Caffeine.newBuilder()
// caches context lookups
private final LoadingCache<T, Contexts> lookupCache = Caffeine.newBuilder()
.weakKeys()
.expireAfterWrite(50L, TimeUnit.MILLISECONDS)
.removalListener((RemovalListener<T, ImmutableContextSet>) (t, contextSet, removalCause) -> {
if (t != null) {
invalidateContextsCache(t);
}
})
.build(t -> calculateApplicableContext(t, MutableContextSet.create()).makeImmutable());
.expireAfterWrite(50L, TimeUnit.MILLISECONDS) // expire roughly every tick
.build(subject -> {
MutableContextSet accumulator = MutableContextSet.create();
calculateApplicableContext(subject, accumulator);
private final LoadingCache<T, Contexts> contextsCache = Caffeine.newBuilder()
.weakKeys()
.expireAfterWrite(100L, TimeUnit.MILLISECONDS)
.build(t -> formContexts(t, getApplicableContext(t)));
ImmutableContextSet ret = accumulator.makeImmutable();
return formContexts(subject, ret);
});
/**
* Queries the ContextManager for current context values for the subject.
*
* @param subject the subject
* @return the applicable context for the subject
*/
public ImmutableContextSet getApplicableContext(@NonNull T subject) {
return activeContextCache.get(subject);
// this is actually already immutable, but the Contexts method signature returns the interface.
return getApplicableContexts(subject).getContexts().makeImmutable();
}
/**
* Queries the ContextManager for current context values for the subject.
*
* @param subject the subject
* @return the applicable context for the subject
*/
public Contexts getApplicableContexts(@NonNull T subject) {
return contextsCache.get(subject);
return lookupCache.get(subject);
}
public abstract Contexts formContexts(T t, ImmutableContextSet contextSet);
private MutableContextSet calculateApplicableContext(T subject, MutableContextSet accumulator) {
for (ContextCalculator<T> calculator : calculators) {
try {
calculator.giveApplicableContext(subject, accumulator);
} catch (Exception e) {
new RuntimeException("Exception thrown by ContextCalculator: " + calculator.getClass().getName(), e).printStackTrace();
}
}
return accumulator;
}
private void invalidateContextsCache(T t) {
contextsCache.invalidate(t);
}
/**
* Forms a {@link Contexts} instance from an {@link ImmutableContextSet}.
*
* @param subject the subject
* @param contextSet the context set
* @return a contexts instance
*/
public abstract Contexts formContexts(T subject, ImmutableContextSet contextSet);
/**
* Registers a context calculator with the manager.
*
* @param calculator the calculator
*/
public void registerCalculator(ContextCalculator<T> calculator) {
registerCalculator(calculator, false);
}
/**
* Registers a context calculator with the manager.
*
* @param calculator the calculator
* @param isStatic if the calculator is static. (if it allows a null subject parameter)
*/
public void registerCalculator(ContextCalculator<T> calculator, boolean isStatic) {
// calculators registered first should have priority (and be checked last.)
calculators.add(0, calculator);
@ -99,6 +117,11 @@ public abstract class ContextManager<T> {
}
}
/**
* Gets the contexts from the static calculators in this manager.
*
* @return the current active static contexts
*/
public ImmutableContextSet getStaticContexts() {
MutableContextSet accumulator = MutableContextSet.create();
for (ContextCalculator<?> calculator : staticCalculators) {
@ -107,11 +130,34 @@ public abstract class ContextManager<T> {
return accumulator.makeImmutable();
}
/**
* Invalidates the lookup cache for a given subject
*
* @param subject the subject
*/
public void invalidateCache(@NonNull T subject){
activeContextCache.invalidate(subject);
lookupCache.invalidate(subject);
}
/**
* Gets the number of calculators registered with the manager.
*
* @return the number of calculators registered
*/
public int getCalculatorsSize() {
return calculators.size();
}
// iterates the calculators in this manager and accumulates contexts from them all.
private void calculateApplicableContext(T subject, MutableContextSet accumulator) {
for (ContextCalculator<T> calculator : calculators) {
try {
calculator.giveApplicableContext(subject, accumulator);
} catch (Exception e) {
new RuntimeException("Exception thrown by ContextCalculator: " + calculator.getClass().getName(), e).printStackTrace();
}
}
}
}