next
Version:
The React Framework
88 lines (87 loc) • 3.89 kB
JavaScript
import { DYNAMIC_STALETIME_MS } from '../router-reducer/reducers/navigate-reducer';
/**
* Sentinel value indicating that no per-page dynamic stale time was provided.
* When this is the dynamicStaleTime, the default DYNAMIC_STALETIME_MS is used.
*/ export const UnknownDynamicStaleTime = -1;
/**
* Converts a dynamic stale time (in seconds, as sent by the server in the `d`
* field of the Flight response) to an absolute staleAt timestamp. When the
* value is unknown, falls back to the global DYNAMIC_STALETIME_MS.
*/ export function computeDynamicStaleAt(now, dynamicStaleTimeSeconds) {
return dynamicStaleTimeSeconds !== UnknownDynamicStaleTime ? now + dynamicStaleTimeSeconds * 1000 : now + DYNAMIC_STALETIME_MS;
}
import { setInCacheMap, getFromCacheMap, createCacheMap } from './cache-map';
const bfcacheMap = createCacheMap();
let currentBfCacheVersion = 0;
export function invalidateBfCache() {
if (typeof window === 'undefined') {
return;
}
currentBfCacheVersion++;
}
export function writeToBFCache(now, varyPath, rsc, prefetchRsc, head, prefetchHead, dynamicStaleAt) {
if (typeof window === 'undefined') {
return;
}
const entry = {
rsc,
prefetchRsc,
// TODO: These fields will be removed from both BFCacheEntry and
// SegmentCacheEntry. The head has its own separate cache entry.
head,
prefetchHead,
ref: null,
// TODO: This is just a heuristic. Getting the actual size of the segment
// isn't feasible because it's part of a larger streaming response. The
// LRU will still evict it, we just won't have a fully accurate total
// LRU size. However, we'll probably remove the size tracking from the LRU
// entirely and use memory pressure events instead.
size: 100,
navigatedAt: now,
// A back/forward navigation will disregard the stale time. This field is
// only relevant when staleTimes.dynamic is enabled or unstable_dynamicStaleTime
// is exported by a page.
staleAt: dynamicStaleAt,
version: currentBfCacheVersion
};
const isRevalidation = false;
setInCacheMap(bfcacheMap, varyPath, entry, isRevalidation);
}
export function writeHeadToBFCache(now, varyPath, head, prefetchHead, dynamicStaleAt) {
// Read the special "segment" that represents the head data.
writeToBFCache(now, varyPath, head, prefetchHead, null, null, dynamicStaleAt);
}
/**
* Update the staleAt of an existing BFCache entry. Used after a dynamic
* response arrives with a per-page stale time from `unstable_dynamicStaleTime`.
* The per-page value is authoritative — it overrides whatever staleAt was set
* by the default DYNAMIC_STALETIME_MS.
*/ export function updateBFCacheEntryStaleAt(varyPath, newStaleAt) {
if (typeof window === 'undefined') {
return;
}
const isRevalidation = false;
// Read with staleness bypass (-1) so we can update even stale entries
const entry = getFromCacheMap(-1, currentBfCacheVersion, bfcacheMap, varyPath, isRevalidation);
if (entry !== null) {
entry.staleAt = newStaleAt;
}
}
export function readFromBFCache(varyPath) {
if (typeof window === 'undefined') {
return null;
}
const isRevalidation = false;
return getFromCacheMap(// During a back/forward navigation, it doesn't matter how stale the data
// might be. Pass -1 instead of the actual current time to bypass
// staleness checks.
-1, currentBfCacheVersion, bfcacheMap, varyPath, isRevalidation);
}
export function readFromBFCacheDuringRegularNavigation(now, varyPath) {
if (typeof window === 'undefined') {
return null;
}
const isRevalidation = false;
return getFromCacheMap(now, currentBfCacheVersion, bfcacheMap, varyPath, isRevalidation);
}
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