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However, the varsByCache WeakMap\n// preserves the set of reactive variables that were previously associated\n// with this cache, which makes it possible to \"recall\" the cache at a\n// later time, by reattaching it to those variables. If the cache has been\n// garbage collected in the meantime, because it is no longer reachable,\n// you won't be able to call recallCache(cache), and the cache will\n// automatically disappear from the varsByCache WeakMap.\nexport function recallCache(cache: ApolloCache<any>) {\n getCacheInfo(cache).vars.forEach((rv) => rv.attachCache(cache));\n}\n\nexport function makeVar<T>(value: T): ReactiveVar<T> {\n const caches = new Set<ApolloCache<any>>();\n const listeners = new Set<ReactiveListener<T>>();\n\n const rv: ReactiveVar<T> = function (newValue) {\n if (arguments.length > 0) {\n if (value !== newValue) {\n value = newValue!;\n caches.forEach((cache) => {\n // Invalidate any fields with custom read functions that\n // consumed this variable, so query results involving those\n // fields will be recomputed the next time we read them.\n getCacheInfo(cache).dep.dirty(rv);\n // Broadcast changes to any caches that have previously read\n // from this variable.\n broadcast(cache);\n });\n // Finally, notify any listeners added via rv.onNextChange.\n const oldListeners = Array.from(listeners);\n listeners.clear();\n oldListeners.forEach((listener) => listener(value));\n }\n } else {\n // When reading from the variable, obtain the current cache from\n // context via cacheSlot. This isn't entirely foolproof, but it's\n // the same system that powers varDep.\n const cache = cacheSlot.getValue();\n if (cache) {\n attach(cache);\n getCacheInfo(cache).dep(rv);\n }\n }\n\n return value;\n };\n\n rv.onNextChange = (listener) => {\n listeners.add(listener);\n return () => {\n listeners.delete(listener);\n };\n };\n\n const attach = (rv.attachCache = (cache) => {\n caches.add(cache);\n getCacheInfo(cache).vars.add(rv);\n return rv;\n });\n\n rv.forgetCache = (cache) => caches.delete(cache);\n\n return rv;\n}\n\ntype Broadcastable = ApolloCache<any> & {\n // This method is protected in InMemoryCache, which we are ignoring, but\n // we still want some semblance of type safety when we call it.\n broadcastWatches?: InMemoryCache[\"broadcastWatches\"];\n};\n\nfunction broadcast(cache: Broadcastable) {\n if (cache.broadcastWatches) {\n cache.broadcastWatches();\n }\n}\n"]} |