next/dist/esm/server/use-cache/handlers.js

The React Framework

import DefaultCacheHandler from '../lib/cache-handlers/default';
const debug = process.env.NEXT_PRIVATE_DEBUG_USE_CACHE ? (message, ...args)=>{
    console.log(`use-cache[${process.pid}]: ${message}`, ...args);
} : ()=>{};
const handlersSymbol = Symbol.for('@next/cache-handlers');
const handlersMapSymbol = Symbol.for('@next/cache-handlers-map');
const handlersSetSymbol = Symbol.for('@next/cache-handlers-set');
/**
 * The reference to the cache handlers. We store the cache handlers on the
 * global object so that we can access the same instance across different
 * boundaries (such as different copies of the same module).
 */ const reference = globalThis;
/**
 * Initialize the cache handlers.
 * @returns `true` if the cache handlers were initialized, `false` if they were already initialized.
 */ export function initializeCacheHandlers() {
    // If the cache handlers have already been initialized, don't do it again.
    if (reference[handlersMapSymbol]) {
        debug('cache handlers already initialized');
        return false;
    }
    debug('initializing cache handlers');
    reference[handlersMapSymbol] = new Map();
    // Initialize the cache from the symbol contents first.
    if (reference[handlersSymbol]) {
        let fallback;
        if (reference[handlersSymbol].DefaultCache) {
            debug('setting "default" cache handler from symbol');
            fallback = reference[handlersSymbol].DefaultCache;
        } else {
            debug('setting "default" cache handler from default');
            fallback = DefaultCacheHandler;
        }
        reference[handlersMapSymbol].set('default', fallback);
        if (reference[handlersSymbol].RemoteCache) {
            debug('setting "remote" cache handler from symbol');
            reference[handlersMapSymbol].set('remote', reference[handlersSymbol].RemoteCache);
        } else {
            debug('setting "remote" cache handler from default');
            reference[handlersMapSymbol].set('remote', fallback);
        }
    } else {
        debug('setting "default" cache handler from default');
        reference[handlersMapSymbol].set('default', DefaultCacheHandler);
        debug('setting "remote" cache handler from default');
        reference[handlersMapSymbol].set('remote', DefaultCacheHandler);
    }
    // Create a set of the cache handlers.
    reference[handlersSetSymbol] = new Set(reference[handlersMapSymbol].values());
    return true;
}
/**
 * Get a cache handler by kind.
 * @param kind - The kind of cache handler to get.
 * @returns The cache handler, or `undefined` if it is not initialized or does not exist.
 */ export function getCacheHandler(kind) {
    // This should never be called before initializeCacheHandlers.
    if (!reference[handlersMapSymbol]) {
        throw Object.defineProperty(new Error('Cache handlers not initialized'), "__NEXT_ERROR_CODE", {
            value: "E649",
            enumerable: false,
            configurable: true
        });
    }
    return reference[handlersMapSymbol].get(kind);
}
/**
 * Get an iterator over the cache handlers.
 * @returns An iterator over the cache handlers, or `undefined` if they are not initialized.
 */ export function getCacheHandlers() {
    if (!reference[handlersSetSymbol]) {
        return undefined;
    }
    return reference[handlersSetSymbol].values();
}
/**
 * Set a cache handler by kind.
 * @param kind - The kind of cache handler to set.
 * @param cacheHandler - The cache handler to set.
 */ export function setCacheHandler(kind, cacheHandler) {
    // This should never be called before initializeCacheHandlers.
    if (!reference[handlersMapSymbol] || !reference[handlersSetSymbol]) {
        throw Object.defineProperty(new Error('Cache handlers not initialized'), "__NEXT_ERROR_CODE", {
            value: "E649",
            enumerable: false,
            configurable: true
        });
    }
    debug('setting cache handler for "%s"', kind);
    reference[handlersMapSymbol].set(kind, cacheHandler);
    reference[handlersSetSymbol].add(cacheHandler);
}

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