/home/techb158/balavpn.abdallabala.com/node_modules/next/dist/server/app-render
Edit: /home/techb158/balavpn.abdallabala.com/node_modules/next/dist/server/app-render/cache-signal.js (5984B)
/**
* This class is used to detect when all cache reads for a given render are settled.
* We do this to allow for cache warming the prerender without having to continue rendering
* the remainder of the page. This feature is really only useful when the cacheComponents flag is on
* and should only be used in codepaths gated with this feature.
*/ "use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "CacheSignal", {
enumerable: true,
get: function() {
return CacheSignal;
}
});
const _invarianterror = require("../../shared/lib/invariant-error");
class CacheSignal {
constructor(){
this.count = 0;
this.earlyListeners = [];
this.listeners = [];
this.tickPending = false;
this.taskPending = false;
this.subscribedSignals = null;
if (process.env.NEXT_RUNTIME === 'edge') {
// we rely on `process.nextTick`, which is not supported in edge
throw Object.defineProperty(new _invarianterror.InvariantError('CacheSignal cannot be used in the edge runtime, because `cacheComponents` does not support it.'), "__NEXT_ERROR_CODE", {
value: "E685",
enumerable: false,
configurable: true
});
}
}
noMorePendingCaches() {
if (!this.tickPending) {
this.tickPending = true;
process.nextTick(()=>{
this.tickPending = false;
if (this.count === 0) {
for(let i = 0; i < this.earlyListeners.length; i++){
this.earlyListeners[i]();
}
this.earlyListeners.length = 0;
}
});
}
if (!this.taskPending) {
this.taskPending = true;
setTimeout(()=>{
this.taskPending = false;
if (this.count === 0) {
for(let i = 0; i < this.listeners.length; i++){
this.listeners[i]();
}
this.listeners.length = 0;
}
}, 0);
}
}
/**
* This promise waits until there are no more in progress cache reads but no later.
* This allows for adding more cache reads after to delay cacheReady.
*/ inputReady() {
return new Promise((resolve)=>{
this.earlyListeners.push(resolve);
if (this.count === 0) {
this.noMorePendingCaches();
}
});
}
/**
* If there are inflight cache reads this Promise can resolve in a microtask however
* if there are no inflight cache reads then we wait at least one task to allow initial
* cache reads to be initiated.
*/ cacheReady() {
return new Promise((resolve)=>{
this.listeners.push(resolve);
if (this.count === 0) {
this.noMorePendingCaches();
}
});
}
beginRead() {
this.count++;
if (this.subscribedSignals !== null) {
for (const subscriber of this.subscribedSignals){
subscriber.beginRead();
}
}
}
endRead() {
if (this.count === 0) {
throw Object.defineProperty(new _invarianterror.InvariantError('CacheSignal got more endRead() calls than beginRead() calls'), "__NEXT_ERROR_CODE", {
value: "E678",
enumerable: false,
configurable: true
});
}
// If this is the last read we need to wait a task before we can claim the cache is settled.
// The cache read will likely ping a Server Component which can read from the cache again and this
// will play out in a microtask so we need to only resolve pending listeners if we're still at 0
// after at least one task.
// We only want one task scheduled at a time so when we hit count 1 we don't decrement the counter immediately.
// If intervening reads happen before the scheduled task runs they will never observe count 1 preventing reentrency
this.count--;
if (this.count === 0) {
this.noMorePendingCaches();
}
if (this.subscribedSignals !== null) {
for (const subscriber of this.subscribedSignals){
subscriber.endRead();
}
}
}
trackRead(promise) {
this.beginRead();
// `promise.finally()` still rejects, so don't use it here to avoid unhandled rejections
const onFinally = this.endRead.bind(this);
promise.then(onFinally, onFinally);
return promise;
}
subscribeToReads(subscriber) {
if (subscriber === this) {
throw Object.defineProperty(new _invarianterror.InvariantError('A CacheSignal cannot subscribe to itself'), "__NEXT_ERROR_CODE", {
value: "E679",
enumerable: false,
configurable: true
});
}
if (this.subscribedSignals === null) {
this.subscribedSignals = new Set();
}
this.subscribedSignals.add(subscriber);
// we'll notify the subscriber of each endRead() on this signal,
// so we need to give it a corresponding beginRead() for each read we have in flight now.
for(let i = 0; i < this.count; i++){
subscriber.beginRead();
}
return this.unsubscribeFromReads.bind(this, subscriber);
}
unsubscribeFromReads(subscriber) {
if (!this.subscribedSignals) {
return;
}
this.subscribedSignals.delete(subscriber);
// we don't need to set the set back to `null` if it's empty --
// if other signals are subscribing to this one, it'll likely get more subscriptions later,
// so we'd have to allocate a fresh set again when that happens.
}
}
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