439 lines
12 KiB
JavaScript
439 lines
12 KiB
JavaScript
import D from 'debug';
|
|
import without from 'lodash.without';
|
|
|
|
import {
|
|
compose,
|
|
EventEmitter,
|
|
fastApply,
|
|
merge,
|
|
mergeDiff,
|
|
} from '@avocado/core';
|
|
import {SynchronizedMixin} from '@avocado/net';
|
|
import {Resource} from '@avocado/resource';
|
|
|
|
import {hasTrait, lookupTrait} from './trait/registrar';
|
|
import EntityUpdateTraitPacket from './packets/entity-update-trait.packet';
|
|
|
|
const debug = D('@avocado:entity:traits');
|
|
|
|
const blacklistedAccessorKeys = [
|
|
'state',
|
|
];
|
|
|
|
// This really seems like a whole lot of complicated nonsense, but it's an
|
|
// unfortunate consequence of V8 (and maybe others) not optimizing mutable
|
|
// accessors in fast hidden classes.
|
|
const traitAccessorForPropertyMap = {};
|
|
function traitAccessorForProperty(type, property) {
|
|
if (!(type in traitAccessorForPropertyMap)) {
|
|
traitAccessorForPropertyMap[type] = {};
|
|
}
|
|
if (!(property in traitAccessorForPropertyMap[type])) {
|
|
traitAccessorForPropertyMap[type][property] = {
|
|
get: new Function('', `
|
|
return this._traits['${type}']['${property}'];
|
|
`),
|
|
set: new Function('value', `
|
|
this._traits['${type}']['${property}'] = value;
|
|
`),
|
|
};
|
|
}
|
|
return traitAccessorForPropertyMap[type][property];
|
|
}
|
|
function defineTraitAccessors(from, to, instance) {
|
|
const type = instance.constructor.type();
|
|
do {
|
|
Object.getOwnPropertyNames(from).forEach((accessorKey) => {
|
|
if (-1 !== blacklistedAccessorKeys.indexOf(accessorKey)) {
|
|
return;
|
|
}
|
|
let descriptor = Object.getOwnPropertyDescriptor(from, accessorKey);
|
|
// Make sure it's actually an accessor.
|
|
if (!descriptor.get && !descriptor.set) {
|
|
return;
|
|
}
|
|
const accessor = traitAccessorForProperty(type, accessorKey);
|
|
if (descriptor.get) {
|
|
descriptor.get = accessor.get;
|
|
}
|
|
if (descriptor.set) {
|
|
descriptor.set = accessor.set;
|
|
}
|
|
Object.defineProperty(to, accessorKey, descriptor);
|
|
});
|
|
} while (Object.prototype !== (from = Object.getPrototypeOf(from)));
|
|
}
|
|
function enumerateTraitAccessorKeys(prototype) {
|
|
const keys = [];
|
|
do {
|
|
Object.getOwnPropertyNames(prototype).forEach((accessorKey) => {
|
|
if (-1 !== blacklistedAccessorKeys.indexOf(accessorKey)) {
|
|
return;
|
|
}
|
|
let descriptor = Object.getOwnPropertyDescriptor(prototype, accessorKey);
|
|
// Make sure it's actually an accessor.
|
|
if (!descriptor.get && !descriptor.set) {
|
|
return;
|
|
}
|
|
keys.push(accessorKey);
|
|
});
|
|
} while (Object.prototype !== (prototype = Object.getPrototypeOf(prototype)));
|
|
return keys;
|
|
}
|
|
|
|
const decorate = compose(
|
|
EventEmitter,
|
|
SynchronizedMixin,
|
|
);
|
|
|
|
let numericUid = AVOCADO_SERVER ? 1 : 1000000000;
|
|
|
|
export default class Entity extends decorate(Resource) {
|
|
|
|
constructor(json, jsonext) {
|
|
super();
|
|
this._fastDirtyCheck = true;
|
|
this._hooks = {};
|
|
this._hydrationPromise = undefined;
|
|
this._json = Entity.jsonWithDefaults(json);
|
|
this._tickingPromisesTickers = [];
|
|
this._traits = {};
|
|
this._traitsFlat = [];
|
|
this._traitTickers = [];
|
|
this._traitRenderTickers = [];
|
|
this._traitsAcceptingPackets = [];
|
|
this.once('destroyed', () => {
|
|
this.removeAllTraits();
|
|
});
|
|
// Bind to prevent lookup overhead.
|
|
this.tick = this.tick.bind(this);
|
|
// Fast props.
|
|
this.numericUid = numericUid++;
|
|
this.instanceUuid = this.numericUid;
|
|
this.position = [0, 0];
|
|
this.room = null;
|
|
this.visibleAabb = [0, 0, 0, 0];
|
|
// Fast path for instance.
|
|
if ('undefined' !== typeof json) {
|
|
this.fromJSON(merge({}, json, jsonext));
|
|
}
|
|
}
|
|
|
|
acceptPacket(packet) {
|
|
if (packet instanceof EntityUpdateTraitPacket) {
|
|
const {traits} = packet.data;
|
|
for (let i = 0; i < traits.length; i++) {
|
|
const {type, packets} = traits[i];
|
|
for (let j = 0; j < packets.length; j++) {
|
|
this._traits[type].acceptPacket(packets[j]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
addTickingPromise(tickingPromise) {
|
|
const ticker = tickingPromise.tick.bind(tickingPromise);
|
|
this._tickingPromisesTickers.push(ticker);
|
|
return tickingPromise.then(() => {
|
|
const index = this._tickingPromisesTickers.indexOf(ticker);
|
|
if (-1 !== index) {
|
|
this._tickingPromisesTickers.splice(index, 1);
|
|
}
|
|
})
|
|
}
|
|
|
|
addTrait(type, json = {}) {
|
|
if (this.is(type)) {
|
|
debug(`Tried to add trait "${type}" when it already exists!`);
|
|
return;
|
|
}
|
|
if (!hasTrait(type)) {
|
|
debug(`Tried to add trait "${type}" which isn't registered!`);
|
|
return;
|
|
}
|
|
const Trait = lookupTrait(type);
|
|
// Ensure dependencies.
|
|
const dependencies = Trait.dependencies();
|
|
const allTypes = this.allTraitTypes();
|
|
const lacking = without(dependencies, ...allTypes);
|
|
if (lacking.length > 0) {
|
|
debug(
|
|
`Tried to add trait "${type}" but lack one or more dependents: "${
|
|
lacking.join('", "')
|
|
}"!`
|
|
);
|
|
// return;
|
|
}
|
|
// Instantiate.
|
|
const {params, state} = json;
|
|
const instance = new Trait(this, params, state);
|
|
// Proxy properties.
|
|
defineTraitAccessors(Trait.prototype, this, instance);
|
|
// Attach listeners.
|
|
const listeners = instance.memoizedListeners();
|
|
for (const eventName in listeners) {
|
|
this.on(eventName, listeners[eventName]);
|
|
}
|
|
// Proxy methods.
|
|
const methods = instance.methods();
|
|
for (const key in methods) {
|
|
this[key] = methods[key];
|
|
}
|
|
// Register hook listeners.
|
|
const hooks = instance.hooks();
|
|
for (const key in hooks) {
|
|
this._hooks[key] = this._hooks[key] || [];
|
|
this._hooks[key].push({
|
|
fn: hooks[key],
|
|
type: Trait.type(),
|
|
});
|
|
}
|
|
// Track trait.
|
|
this._traits[type] = instance;
|
|
this._traitsFlat.push(instance);
|
|
if ('tick' in instance) {
|
|
this._traitTickers.push(instance.tick);
|
|
}
|
|
if ('renderTick' in instance) {
|
|
this._traitRenderTickers.push(instance.renderTick);
|
|
}
|
|
if ('acceptPacket' in instance) {
|
|
this._traitsAcceptingPackets.push(instance);
|
|
}
|
|
this.emit('traitAdded', type, instance);
|
|
}
|
|
|
|
addTraits(traits) {
|
|
for (const type in traits) {
|
|
this.addTrait(type, traits[type]);
|
|
}
|
|
}
|
|
|
|
allTraitInstances() {
|
|
return this._traits;
|
|
}
|
|
|
|
allTraitTypes() {
|
|
return Object.keys(this._traits);
|
|
}
|
|
|
|
cleanPackets() {
|
|
if (!this._fastDirtyCheck) {
|
|
return;
|
|
}
|
|
for (let i = 0; i < this._traitsFlat.length; i++) {
|
|
this._traitsFlat[i].cleanPackets();
|
|
}
|
|
this._fastDirtyCheck = false;
|
|
}
|
|
|
|
fromJSON(json) {
|
|
super.fromJSON(json);
|
|
if (json.instanceUuid) {
|
|
this.instanceUuid = json.instanceUuid;
|
|
}
|
|
this.addTraits(json.traits);
|
|
return this;
|
|
}
|
|
|
|
hydrate() {
|
|
if (!this._hydrationPromise) {
|
|
const promises = [];
|
|
for (let i = 0; i < this._traitsFlat.length; i++) {
|
|
promises.push(this._traitsFlat[i].hydrate());
|
|
}
|
|
this._hydrationPromise = Promise.all(promises);
|
|
this._hydrationPromise.then(() => {
|
|
this.tick(0);
|
|
});
|
|
}
|
|
return this._hydrationPromise;
|
|
}
|
|
|
|
invokeHook(hook, ...args) {
|
|
const results = {};
|
|
if (!(hook in this._hooks)) {
|
|
return results;
|
|
}
|
|
for (const {fn, type} of this._hooks[hook]) {
|
|
results[type] = fastApply(null, fn, args);
|
|
}
|
|
return results;
|
|
}
|
|
|
|
invokeHookFlat(hook, ...args) {
|
|
const invokeResults = this.invokeHook(hook, ...args);
|
|
const results = [];
|
|
for (const type in invokeResults) {
|
|
results.push(invokeResults[type]);
|
|
}
|
|
return results;
|
|
}
|
|
|
|
is(type) {
|
|
return type in this._traits;
|
|
}
|
|
|
|
static jsonWithDefaults(json) {
|
|
if ('undefined' === typeof json) {
|
|
return;
|
|
}
|
|
const pristine = JSON.parse(JSON.stringify(json));
|
|
for (const type in json.traits) {
|
|
if (!hasTrait(type)) {
|
|
continue;
|
|
}
|
|
const Trait = lookupTrait(type);
|
|
pristine.traits[type] = merge({}, Trait.defaultJSON(), json.traits[type]);
|
|
}
|
|
return pristine;
|
|
}
|
|
|
|
mergeDiff(json) {
|
|
if (!this.uri) {
|
|
return json;
|
|
}
|
|
return mergeDiff(this._json, json);
|
|
}
|
|
|
|
packets(informed) {
|
|
const packets = [];
|
|
const updates = [];
|
|
for (const type in this._traits) {
|
|
let traitPackets = this._traits[type].packets(informed);
|
|
if (!traitPackets) {
|
|
continue;
|
|
}
|
|
if (!Array.isArray(traitPackets)) {
|
|
traitPackets = [traitPackets];
|
|
}
|
|
if (traitPackets.length > 0) {
|
|
updates.push({
|
|
type,
|
|
packets: traitPackets,
|
|
});
|
|
}
|
|
}
|
|
if (updates.length > 0) {
|
|
packets.push(new EntityUpdateTraitPacket({
|
|
synchronized: {
|
|
id: 0,
|
|
type: 0,
|
|
},
|
|
traits: updates,
|
|
}));
|
|
}
|
|
return packets;
|
|
}
|
|
|
|
renderTick(elapsed) {
|
|
for (let i = 0; i < this._traitRenderTickers.length; i++) {
|
|
this._traitRenderTickers[i](elapsed);
|
|
}
|
|
}
|
|
|
|
removeAllTraits() {
|
|
const types = this.allTraitTypes();
|
|
this.removeTraits(types);
|
|
}
|
|
|
|
removeTrait(type) {
|
|
if (!this.is(type)) {
|
|
debug(`Tried to remove trait "${type}" when it doesn't exist!`);
|
|
return;
|
|
}
|
|
// Destroy instance.
|
|
const instance = this._traits[type];
|
|
instance.destroy();
|
|
// Remove methods, hooks, and properties.
|
|
const methods = instance.methods();
|
|
for (const key in methods) {
|
|
delete this[key];
|
|
}
|
|
const hooks = instance.hooks();
|
|
for (const key in hooks) {
|
|
const implementation = this._hooks[key].find(({type: hookType}) => {
|
|
return hookType === type;
|
|
});
|
|
this._hooks[key].splice(this._hooks[key].indexOf(implementation), 1);
|
|
}
|
|
const Trait = lookupTrait(type);
|
|
const properties = enumerateTraitAccessorKeys(Trait.prototype);
|
|
for (let i = 0; i < properties.length; ++i) {
|
|
const property = properties[i];
|
|
delete this[property];
|
|
}
|
|
// Remove all event listeners.
|
|
const listeners = instance.memoizedListeners();
|
|
for (const eventName in listeners) {
|
|
this.off(eventName, listeners[eventName]);
|
|
}
|
|
instance._memoizedListeners = {};
|
|
// Remove instance.
|
|
delete this._traits[type];
|
|
this._traitsFlat.splice(this._traitsFlat.indexOf(instance), 1);
|
|
if ('tick' in instance) {
|
|
this._traitTickers.splice(
|
|
this._traitTickers.indexOf(instance.tick),
|
|
1
|
|
);
|
|
}
|
|
if ('renderTick' in instance) {
|
|
this._traitRenderTickers.splice(
|
|
this._traitRenderTickers.indexOf(instance.renderTick),
|
|
1
|
|
);
|
|
}
|
|
const acceptPacketIndex = this._traitsAcceptingPackets.indexOf(instance);
|
|
if (-1 !== acceptPacketIndex) {
|
|
this._traitsAcceptingPackets.splice(acceptPacketIndex, 1);
|
|
}
|
|
// Unloop.
|
|
instance.entity = undefined;
|
|
}
|
|
|
|
removeTraits(types) {
|
|
types.forEach((type) => this.removeTrait(type));
|
|
}
|
|
|
|
synchronizationId() {
|
|
return this.instanceUuid;
|
|
}
|
|
|
|
tick(elapsed) {
|
|
for (let i = 0; i < this._traitTickers.length; i++) {
|
|
this._traitTickers[i](elapsed);
|
|
}
|
|
for (let i = 0; i < this._tickingPromisesTickers.length; i++) {
|
|
this._tickingPromisesTickers[i](elapsed);
|
|
}
|
|
}
|
|
|
|
toNetwork(informed) {
|
|
const json = {
|
|
traits: {},
|
|
};
|
|
for (const type in this._traits) {
|
|
json.traits[type] = this._traits[type].toNetwork(informed);
|
|
}
|
|
return {
|
|
...super.toJSON(),
|
|
instanceUuid: this.instanceUuid,
|
|
...this.mergeDiff(json),
|
|
};
|
|
}
|
|
|
|
toJSON() {
|
|
const json = {};
|
|
for (const type in this._traits) {
|
|
json[type] = this._traits[type].toJSON();
|
|
}
|
|
return {
|
|
...super.toJSON(),
|
|
instanceUuid: this.instanceUuid,
|
|
traits: json,
|
|
};
|
|
}
|
|
|
|
}
|