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357 lines (279 loc) · 12.8 KB
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package com.abilityapi.sequenceapi;
import com.abilityapi.sequenceapi.util.Ordered;
import com.abilityapi.sequenceapi.util.Tristate;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import java.util.UUID;
import java.util.function.Predicate;
import static com.abilityapi.sequenceapi.SequencePreconditions.checkContextNotNull;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Represents a way to manage the life cycle of
* an {@link Sequence} provided by the {@link SequenceRegistry}
* as a {@link SequenceBlueprint}.
*
* @param <T> the event type
*/
public class SequenceManager<T> {
private final SequenceRegistry<T> sequenceRegistry;
private final Multimap<UUID, Sequence<T>> sequences = HashMultimap.create();
private final Multimap<UUID, Ordered<Class<? extends T>>> blockedSequences = HashMultimap.create();
private long blockOrderIndex = 0;
public SequenceManager(final SequenceRegistry<T> sequenceRegistry) {
this.sequenceRegistry = sequenceRegistry;
}
/**
* Invokes the observer check with the provided event
* and {@link SequenceContext}.
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#ID} to provide ownership over
* a running {@link Sequence}.</p>
*
* @param event the event
* @param sequenceContext the sequence context
*/
public void invokeObserver(final T event, final SequenceContext sequenceContext) {
checkNotNull(event);
checkNotNull(sequenceContext);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.ID, UUID.class);
this.sequences.get(sequenceContext.getId()).removeIf(sequence -> {
for (Ordered<Class<? extends T>> block : this.blockedSequences.get(sequenceContext.getId())) {
if (block.getElement().equals(sequence.getTrigger())) return true;
}
return this._invokeObserver(event, sequence, sequenceContext);
});
// Creates a new sequence from a blueprint.
this._createBlueprints(event, sequenceContext);
}
/**
* Invokes the observer check with the provided event
* and {@link SequenceContext} if the predicate returns true.
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#ID} to provide ownership over
* a running {@link Sequence}.</p>
*
* @param event the event
* @param sequenceContext the sequence context
* @param predicate the predicate
*/
public void invokeObserverIf(final T event, final SequenceContext sequenceContext, final Predicate<Object> predicate) {
checkNotNull(event);
checkNotNull(sequenceContext);
checkNotNull(predicate);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.ID, UUID.class);
this.sequences.get(sequenceContext.getId()).removeIf(sequence -> {
for (Ordered<Class<? extends T>> block : this.blockedSequences.get(sequenceContext.getId())) {
if (block.getElement().equals(sequence.getTrigger())) return true;
}
if (!predicate.test(sequence)) return false;
return this._invokeObserver(event, sequence, sequenceContext);
});
// Creates a new sequence from a blueprint.
this._createBlueprints(event, sequenceContext);
}
/**
* Invokes the scheduler update with the provided
* {@link SequenceContext}.
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#ID} to provide ownership over
* a running {@link Sequence}.</p>
*
* @param sequenceContext the sequence context
*/
public void updateScheduler(final SequenceContext sequenceContext) {
checkNotNull(sequenceContext);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.ID, UUID.class);
this.sequences.get(sequenceContext.getId()).removeIf(sequence -> {
for (Ordered<Class<? extends T>> block : this.blockedSequences.get(sequenceContext.getId())) {
if (block.getElement().equals(sequence.getTrigger())) return true;
}
return this._invokeScheduler(sequence, sequenceContext) || this._invokeAfter(sequence, sequenceContext);
});
}
/**
* Invokes the scheduler update with the provided
* {@link SequenceContext} if the predicate returns true.
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#ID} to provide ownership over
* a running {@link Sequence}.</p>
*
* @param sequenceContext the sequence context
* @param predicate the predicate
*/
public void updateSchedulerIf(final SequenceContext sequenceContext, final Predicate<Sequence<T>> predicate) {
checkNotNull(sequenceContext);
checkNotNull(predicate);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.ID, UUID.class);
this.sequences.get(sequenceContext.getId()).removeIf(sequence -> {
for (Ordered<Class<? extends T>> block : this.blockedSequences.get(sequenceContext.getId())) {
if (block.getElement().equals(sequence.getTrigger())) return true;
}
if (!predicate.test(sequence)) return false;
return this._invokeScheduler(sequence, sequenceContext) || this._invokeAfter(sequence, sequenceContext);
});
}
/**
* Adds the trigger class from the {@link SequenceContext} root
* to the block list, which is removed on the next invocation.
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#OWNER} to provide ownership over
* a running {@link Sequence}.
*
* It must also contain a {@link SequenceContext#ROOT} that
* is an event class trigger of {@link T} to filter.</p>
*
* @param sequenceContext the sequence context
* @return the block id
*/
public long block(final SequenceContext sequenceContext) {
checkNotNull(sequenceContext);
checkContextNotNull(sequenceContext, SequenceContext.ROOT);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.OWNER, UUID.class);
final long index = this.blockOrderIndex++;
if (this.blockedSequences.containsEntry(sequenceContext.getOwner(), new Ordered<>(index, sequenceContext.getRoot()))) return index;
this.blockedSequences.put(sequenceContext.getOwner(), new Ordered<>(index, sequenceContext.getRoot()));
return index;
}
/**
* Removes the trigger class found in the
* {@link SequenceContext} root in the block list.
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#OWNER} to provide ownership over
* a running {@link Sequence}.
*
* It will also look for a {@link SequenceContext#ID} to
* provide the order index.
*
* It must also contain a {@link SequenceContext#ROOT} that
* is an event class trigger of {@link T} to filter.</p>
*
* @param sequenceContext the sequence context
*/
public void unblock(final SequenceContext sequenceContext) {
checkNotNull(sequenceContext);
checkContextNotNull(sequenceContext, SequenceContext.ROOT);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.ID, Long.class);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.OWNER, UUID.class);
if (!this.blockedSequences.containsEntry(sequenceContext.getOwner(), new Ordered<>(sequenceContext.getId(), sequenceContext.getRoot()))) return;
this.blockedSequences.remove(sequenceContext.getOwner(), new Ordered<>(sequenceContext.getId(), sequenceContext.getRoot()));
}
/**
* Removes all the {@link Sequence} from the running
* list if it has expired or cancelled.
*
* <p>If force is set to true, it will remove all of the
* running sequences regardless whether it has been
* cancelled or expired.</p>
*
* @param force false to remove safely, true to remove with force
*/
public void clean(boolean force) {
ImmutableSet.copyOf(this.sequences.keySet()).forEach(uuid -> this.clean(SequenceContext.builder().id(uuid).build(), force));
}
/**
* Removes a specific {@link Sequence} from the running
* list if it has expired or cancelled.
*
* <p>If force is set to true, it will remove all of the
* running sequences regardless whether it has been
* cancelled or expired.</p>
*
* <p>The {@link SequenceContext} must contain a unique
* {@link SequenceContext#ID} to provide ownership over
* a running {@link Sequence}.</p>
*
* @param sequenceContext the sequence context
* @param force false to remove safely, true to remove with force
*/
public void clean(final SequenceContext sequenceContext, boolean force) {
checkNotNull(sequenceContext);
SequencePreconditions.checkContextType(sequenceContext, SequenceContext.ID, UUID.class);
this.sequences.get(sequenceContext.getId()).removeIf(sequence -> {
if (sequence.getState().equals(Sequence.State.FINISHED)) return force;
return force || sequence.getState().equals(Sequence.State.EXPIRED);
});
}
public boolean _invokeObserver(final T event, final Sequence<T> sequence, final SequenceContext sequenceContext) {
boolean remove = false;
// 1. Apply the sequence.
sequence.applyObserve(event, sequenceContext);
// 2. Check if the sequence is cancelled, or is expired.
final Sequence.State sequenceState = sequence.getState();
// Check for an updated state first.
sequenceState.update(sequence);
if (!sequenceState.isSafe()) {
remove = true;
}
// 3. Check if the sequence has finished and fire the hook and remove.
if (sequenceState.equals(Sequence.State.FINISHED)) {
// Fire sequence finish hook.
remove = true;
}
return remove;
}
public boolean _invokeAfter(final Sequence<T> sequence, final SequenceContext sequenceContext) {
boolean remove;
// 1. Apply the sequence, this has one chance to pass, so if it fails it can be removed.
remove = sequence.applyAfter(sequenceContext).equals(Tristate.FALSE);
// 2. Check if the sequence is cancelled, or is expired.
final Sequence.State sequenceState = sequence.getState();
// Check for an updated state first.
sequenceState.update(sequence);
if (!sequenceState.isSafe()) {
remove = true;
}
// 3. Check if the sequence has finished and fire the hook and remove.
if (sequenceState.equals(Sequence.State.FINISHED)) {
// Fire sequence finish hook.
remove = true;
}
return remove;
}
public boolean _invokeScheduler(final Sequence<T> sequence, final SequenceContext sequenceContext) {
boolean remove = false;
// 1. Apply the sequence.
sequence.applySchedule(sequenceContext);
// 2. Check if the sequence is cancelled, or is expired.
final Sequence.State sequenceState = sequence.getState();
// Check for an updated state first.
sequenceState.update(sequence);
if (!sequenceState.isSafe()) {
remove = true;
}
// 3. Check if the sequence has finished and fire the hook and remove.
if (sequenceState.equals(Sequence.State.FINISHED)) {
// Fire sequence finish hook.
remove = true;
}
return remove;
}
public void _createBlueprints(final T event, final SequenceContext sequenceContext) {
for (SequenceBlueprint<T> sequenceBlueprint : this.sequenceRegistry) {
// 1. Check for matching sequence.
if (this.sequences.get(sequenceContext.getId()).stream()
.anyMatch(playerSequence -> playerSequence.getBlueprint()
.equals(sequenceBlueprint))) continue;
// 2. Apply the sequence for the first time to check the observer or leave it.
final Sequence<T> sequence = sequenceBlueprint.create(sequenceContext);
if (sequence.applyObserve(event, sequenceContext)) {
// Check for an updated state first.
sequence.getState().update(sequence);
if (!sequence.getState().isSafe()) {
continue;
}
if (sequence.getState().equals(Sequence.State.FINISHED)) {
// Fire sequence finish hook.
continue;
}
this.sequences.put(sequenceContext.getId(), sequence);
}
}
}
}