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Copy pathSequence.java
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358 lines (273 loc) · 11.3 KB
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package com.abilityapi.sequenceapi;
import com.abilityapi.sequenceapi.action.Action;
import com.abilityapi.sequenceapi.action.Expirable;
import com.abilityapi.sequenceapi.action.type.after.AfterAction;
import com.abilityapi.sequenceapi.action.type.observe.ObserverAction;
import com.abilityapi.sequenceapi.action.type.schedule.ScheduleAction;
import com.abilityapi.sequenceapi.util.EventComparator;
import com.abilityapi.sequenceapi.util.Tristate;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
/**
* Represents an order of {@link Action}s
* and a means of manipulating them to produce
* a result.
*
* @param <T> the event type
*/
public class Sequence<T> {
public static <E> EventComparator<Class<? extends E>, E> getComparatorEqual() {
return (base, that) -> base.equals(that.getClass());
}
public static <E> EventComparator<Class<? extends E>, E> getComparatorAssignable() {
return (base, that) -> base.isAssignableFrom(that.getClass());
}
private final EventComparator<Class<? extends T>, T> eventComparator;
private final SequenceContext sequenceContext;
private final SequenceBlueprint<T> sequenceBlueprint;
private final T rootEvent;
private final List<Action> actions;
private final int actionsSize;
private int index = 0;
private long scheduleTicks = 0;
private long lastTime = System.currentTimeMillis();
private State state = State.INACTIVE;
public Sequence(final T rootEvent,
final List<Action> actions,
final SequenceContext sequenceContext,
final SequenceBlueprint<T> sequenceBlueprint,
final EventComparator<Class<? extends T>, T> eventComparator) {
this.eventComparator = eventComparator;
this.sequenceContext = sequenceContext;
this.sequenceBlueprint = sequenceBlueprint;
this.rootEvent = rootEvent;
this.actions = new ArrayList<>(actions);
this.actionsSize = actions.size();
}
/**
* Applies the next {@link ObserverAction} in the {@link Sequence}
* with an appropriate {@link T} and {@link SequenceContext}.
*
* @param event the event
* @param sequenceContext the sequence context
* @return true if the action was successful and false if it was not
*/
public boolean applyObserve(final T event, final SequenceContext sequenceContext) {
final ListIterator<Action> iterator = this.actions.listIterator();
final SequenceContext modifiedSequenceContext = SequenceContext
.from(sequenceContext)
.merge(this.sequenceContext)
.build();
if (iterator.hasNext()) {
final Action rawAction = iterator.next();
final ObserverAction<T> action;
if (rawAction instanceof ObserverAction) {
action = (ObserverAction<T>) rawAction;
} else return false;
if (this.state.equals(State.INACTIVE)) this.state = State.ACTIVE;
final long current = System.currentTimeMillis();
// 1. Check that the event is the correct one for this action.
if (!this.eventComparator.apply(action.getEventClass(), event)) return this.fail(action, modifiedSequenceContext);
// 2. Fail the action if it is being executed before the delay.
if (this.index > 0 && this.lastTime + ((action.getDelay() / 20) * 1000) > current) {
return this.fail(action, modifiedSequenceContext);
}
// 3. Fail the action if it being executed after the expire.
if (this.index > 0 && this.lastTime + ((action.getExpire() / 20) * 1000) < current) {
return this.fail(action, modifiedSequenceContext);
}
// 4. Run the action conditions and fail if they do not pass.
if (!action.apply(modifiedSequenceContext)) {
return this.fail(action, modifiedSequenceContext);
}
// 5. Succeed the action, remove it, increment the index and set finish if there are no more actions left.
this.index++;
iterator.remove();
if (!iterator.hasNext()) {
if (this.index == this.actionsSize) this.state = State.FINISHED;
}
return this.succeed(action, modifiedSequenceContext);
}
return true;
}
/**
* Applies the next {@link AfterAction} in the {@link Sequence}
* with an appropriate {@link SequenceContext}.
*
* @param sequenceContext the sequence context
*/
public Tristate applyAfter(final SequenceContext sequenceContext) {
final ListIterator<Action> iterator = this.actions.listIterator();
final SequenceContext modifiedSequenceContext = SequenceContext
.from(sequenceContext)
.merge(this.sequenceContext)
.build();
if (iterator.hasNext()) {
final Action rawAction = iterator.next();
final AfterAction action;
if (rawAction instanceof AfterAction) {
action = (AfterAction) rawAction;
} else return Tristate.UNDEFINED;
if (this.state.equals(State.INACTIVE)) this.state = State.ACTIVE;
final long current = System.currentTimeMillis();
// 1. Fail the action if it is being executed before the delay.
if (this.lastTime + ((action.getDelay() / 20) * 1000) > current) {
this.fail(action, modifiedSequenceContext);
return Tristate.UNDEFINED;
}
// 2. Run the action conditions and fail if they do not pass.
if (!action.apply(modifiedSequenceContext)) {
this.fail(action, modifiedSequenceContext);
return Tristate.FALSE;
}
// 3. Succeed the action, remove it, increment the index and set finish if there are no more actions left.
this.index++;
iterator.remove();
if (!iterator.hasNext()) {
if (this.index == this.actionsSize) this.state = State.FINISHED;
}
return Tristate.from(this.succeed(action, modifiedSequenceContext));
}
return Tristate.TRUE;
}
/**
* Applies the next {@link ScheduleAction} in the {@link Sequence}
* with an appropriate {@link SequenceContext}.
*
* @param sequenceContext the sequence context
*/
public void applySchedule(final SequenceContext sequenceContext) {
final ListIterator<Action> iterator = this.actions.listIterator();
final SequenceContext modifiedSequenceContext = SequenceContext
.from(sequenceContext)
.merge(this.sequenceContext)
.build();
if (this.state.equals(State.INACTIVE)) this.state = State.ACTIVE;
this.scheduleTicks++;
if (iterator.hasNext()) {
final Action rawAction = iterator.next();
final ScheduleAction action;
if (rawAction instanceof ScheduleAction) {
action = (ScheduleAction) rawAction;
} else return;
if (this.state.equals(State.INACTIVE)) this.state = State.ACTIVE;
final long current = System.currentTimeMillis();
// 1. Check that the tick is being executed in the period wanted.
if (action.getPeriod() != 0 && this.scheduleTicks % action.getPeriod() != 0) return;
// 2. Fail the action if it is being executed before the delay.
if (this.lastTime + ((action.getDelay() / 20) * 1000) > current) {
this.fail(action, modifiedSequenceContext);
return;
}
// 3. Fail the action if it being executed after the expire.
if (this.lastTime + ((action.getExpire() / 20) * 1000) < current) {
this.fail(action, modifiedSequenceContext);
return;
}
// 4. Run the action conditions and fail if they do not pass.
if (!action.apply(modifiedSequenceContext)) {
this.fail(action, modifiedSequenceContext);
return;
}
// If this is a repeating task that will expire next tick remove it.
if (current + ((action.getPeriod() / 20) * 1000) > this.lastTime + ((action.getExpire() / 20) * 1000)) {
this.index++;
iterator.remove();
if (!iterator.hasNext()) {
if (this.index == this.actionsSize) this.state = State.FINISHED;
}
}
this.succeed(action, modifiedSequenceContext);
}
}
public boolean succeed(final Action action, final SequenceContext sequenceContext) {
action.success(sequenceContext);
this.lastTime = System.currentTimeMillis();
return true;
}
public boolean fail(final Action action, final SequenceContext sequenceContext) {
this.state = action.failure(sequenceContext) ? State.CANCELLED : this.state;
return false;
}
/**
* Returns the {@link SequenceBlueprint}.
*
* @return the sequence blueprint
*/
public final SequenceBlueprint<T> getBlueprint() {
return this.sequenceBlueprint;
}
/**
* Returns the {@link SequenceContext}.
*
* @return the sequence context
*/
public final SequenceContext getSequenceContext() {
return this.sequenceContext;
}
/**
* Returns the trigger {@link T}.
*
* @return the trigger
*/
public final T getTrigger() {
return this.rootEvent;
}
/**
* Returns the trigger {@link T} class.
*
* @return the trigger class
*/
public final Class<? extends T> getTriggerClass() {
return this.sequenceBlueprint.getTrigger();
}
/**
* Returns the {@link EventComparator}.
*
* @return the event comparator
*/
public final EventComparator<Class<? extends T>, T> getEventComparator() {
return this.eventComparator;
}
/**
* Returns the time in milliseconds
* that the last action occurred.
*
* @return the last action time
*/
public final long getLastActionTime() {
return this.lastTime;
}
/**
* Returns the {@link Sequence.State}.
* @return the sequence state
*/
public final State getState() {
return this.state;
}
public enum State {
ACTIVE(true),
INACTIVE(true),
CANCELLED(false),
EXPIRED(false),
FINISHED(true);
private final boolean safe;
State(boolean safe) {
this.safe = safe;
}
public void update(final Sequence sequence) {
// Set no more actions as expired.
if (sequence.actions.isEmpty()) {
sequence.state = State.FINISHED;
return;
}
if (!(sequence.actions.get(0) instanceof Expirable)) return;
Expirable action = (Expirable) sequence.actions.get(0);
if (sequence.getLastActionTime() + ((action.getExpire() / 20) * 1000) < System.currentTimeMillis()) sequence.state = State.EXPIRED;
}
public final boolean isSafe() {
return this.safe;
}
}
}