@microsoft/windows-admin-center-sdk
Version:
Microsoft - Windows Admin Center Shell
863 lines (860 loc) • 38.8 kB
JavaScript
import { EMPTY, merge, Observable, of, ReplaySubject, Subject } from 'rxjs';
import { delay, expand, multicast, refCount, switchMap } from 'rxjs/operators';
import { Logging } from '../diagnostics/logging';
/**
* Query Cache class.
* - Create a cache entry by "create" call with creator object.
* - Subscribe with options to get query result.
* - Refresh data on-demand and interval.
* - Dispose the resource when it's done.
* - Recover and re-subscribe with the same handlers if necessary after an error.
*
* TData the data type of observable responds.
* TParams the options parameters to pass the creator to create new observable.
*/
export class QueryCache {
create;
serializeParams;
destroy;
/**
* Internal instance id counter.
* (set id number to be 0 to bring back older behavior)
*/
static id = 10000;
/**
* Delay clean up time (10 seconds)
*/
static delayTime = 10 * 1000;
/**
* Repeater is parked state.
*/
static repeaterParked = -1;
/**
* Cached data collection with observable ReplaySubject.
*/
cachedData;
/**
* Current options, passed from the fetch call.
*/
options;
/**
* Current observer of create observable.
*/
observer;
/**
* Key string serialized by TParams.
*/
key;
/**
* Delay clean timer object.
*/
delayTimer;
/**
* Auto fetch options.
*/
autoFetchOptions;
/**
* Repeater context to cycle repeating observable.
*/
repeaterContext;
/**
* Instance id of query cache for internal debugging.
*/
id = '{0}-{1}'.format(MsftSme.self().Init.moduleName, ++QueryCache.id);
/**
* The tracing name.
*/
name;
/**
* The start time of tracing.
*/
traceTime;
/**
* Initializes a new instance of the QueryCache.
*
* @param create the function to create a new observable with specified parameters.
* @param serializeParams the function to generate serialized string from specified parameters. (optional)
* @param destroy the function to clean up any residue after all reference was gone. (optional)
*/
constructor(create, serializeParams, destroy) {
this.create = create;
this.serializeParams = serializeParams;
this.destroy = destroy;
}
/**
* Use the QueryCache inside of Worker or background tab view.
* setInterval time lost accuracy within background. Use setTimeout recursive query by expand observable operator.
* Call the static function once before creating new instance of QueryCache, probably set at app.component.ts file.
*/
static useExpandInterval() {
QueryCache.id = 0;
}
/**
* Create or return the cached observable.
*
* @param autoFetchOptions the options parameter auto-fetch when subscribe is called.
* @return Observable<TData> the observable object.
*/
createObservable(autoFetchOptions) {
// for recovery scenario, this.cachedData.subscribers is retained.
// clear them here if no publish ever made.
if (this.cachedData && this.cachedData.publish) {
if (autoFetchOptions) {
// schedule the fetch immediately after current call stack.
setTimeout(() => {
// cancel auto fetch if already unsubscribed.
if (this.cachedData && this.cachedData.publish) {
this.fetch(autoFetchOptions);
}
});
}
return this.cachedData.publish;
}
const fetch = new Subject();
const refresh = new Subject();
const apply = new Subject();
const subscribers = [];
const publish = this.createPublishObservable(fetch, refresh, apply, subscribers);
this.cachedData = { fetch, refresh, publish, apply, subscribers };
this.autoFetchOptions = autoFetchOptions;
return publish;
}
/**
* Unsubscribe any remained subscribers and dispose all remained resources.
* - clearCache() is not necessary to be called if all subscriptions are unsubscribe'ed properly.
*/
clearCache() {
if (!this.cachedData) {
return;
}
if (this.cachedData.subscribers) {
const tempSubscribers = this.cachedData.subscribers.slice(0);
for (const context of tempSubscribers) {
context.subscription.unsubscribe();
}
}
this.cleanup(false);
}
/**
* Fetch with new query options.
* - The fetch starts new query when cache is empty, current cache doesn't match the key generated by
* serializedParams function which was configured at the constructor, interval was changed (ex.
* changing zero interval to active interval or other way around), or the first subscriber like when
* delayClean comes back active subscription.
*
* @param options the options with interval, delay clean, recovery and parameters.
*/
fetch(options) {
if (!this.cachedData) {
const message = MsftSme.getStrings().MsftSmeShell.Core.Error.QueryCacheFetchOrder.message;
Logging.logError('QueryCache', message);
throw new Error(message);
}
if (this.cachedData.fetch) {
// send new request when cache doesn't match the key, interval was changed, or single subscriber.
const key = this.serializeParams ? this.serializeParams(options.params) : '';
if (!this.options
|| this.key !== key
|| this.options.interval !== options.interval
|| this.key == null) {
this.key = key;
this.cachedData.fetch.next(options);
}
}
else {
Logging.logWarning('QueryCache', MsftSme.getStrings().MsftSmeShell.Core.Error.QueryCacheFetchErrorOnce.message);
}
}
/**
* Refresh the query cache with last options and parameters provided on the fetch call.
*/
refresh() {
if (!this.cachedData) {
const message = MsftSme.getStrings().MsftSmeShell.Core.Error.QueryCacheRefreshOrder.message;
Logging.logError('QueryCache', message);
throw new Error(message);
}
if (this.cachedData.refresh) {
this.cachedData.refresh.next(undefined);
}
else {
Logging.logWarning('QueryCache', MsftSme.getStrings().MsftSmeShell.Core.Error.QueryCacheRefreshErrorOnce.message);
}
}
/**
* Recover the observable and subscription.
* - Recover can be used to resubscribe when the observable got any error situation. The observable would
* be unsubscribed state when it got an error response, this function allows to resubscribe without
* recreate observable and subscription.
*
* @param autoFetch if true auto fetch after re-subscribed.
*/
recover(autoFetch) {
if (!this.cachedData) {
const message = MsftSme.getStrings().MsftSmeShell.Core.Error.QueryCacheRecoverNoCachedResource.message;
Logging.logError('QueryCache', message);
throw new Error(message);
}
if (!this.options || !this.options.enableRecovery) {
const message = MsftSme.getStrings().MsftSmeShell.Core.Error.QueryCacheRecoverMissingRecoveryOption.message;
Logging.logError('QueryCache', message);
throw new Error(message);
}
const tempCachedData = this.cachedData;
if (tempCachedData.refresh) {
tempCachedData.refresh.complete();
}
if (tempCachedData.fetch) {
tempCachedData.fetch.complete();
}
if (tempCachedData.apply) {
tempCachedData.apply.complete();
}
for (const context of this.cachedData.subscribers) {
// call original unsubscribe function.
context.subscription.unsubscribe();
}
// recreate new publish observable and subscribe to original set of handlers.
const tempSubscribers = this.cachedData.subscribers.slice(0);
const fetch = new Subject();
const refresh = new Subject();
const apply = new Subject();
const subscribers = [];
const publish = this.createPublishObservable(fetch, refresh, apply, subscribers);
this.cachedData = { fetch, refresh, publish, apply, subscribers };
for (const context of tempSubscribers) {
this.cachedData.publish.subscribe(context.next, context.error, context.complete, context.subscription);
}
if (autoFetch) {
fetch.next(this.options);
}
else {
this.options = {};
}
}
/**
* Apply instant data to the query cache. The data will be delivered to the subscriber immediately.
*
* @param data the data to apply to the replay.
*/
apply(data) {
if (this.cachedData.apply) {
this.cachedData.apply.next(data);
}
}
/**
* Enable tracing of this query cache instance.
*
* @param name the name of query cache.
*/
trace(name) {
this.name = name;
this.traceTime = Date.now();
this.log(`tracing ${this.name}: ${this.id}`);
}
log(message) {
const time = ((Date.now() - this.traceTime)) / 1000;
Logging.debug(`QC: ${this.id} ${this.name}: ${time}sec: ${message}`);
}
createPublishObservable(fetch, refresh, apply, subscribers) {
const publish =
// start data query when new fetch is requested.
fetch
.pipe(
// switch map unsubscribe previous fetch observable tree, and re-create new one.
switchMap(options => {
// remember last options.
this.options = options || {};
// merge output from expand-delay object and refresh object.
return merge(
// submit initial query.
this.repeat(),
// refresh to trigger new observable.
refresh.pipe(switchMap(() => this.create(this.options.params))),
// apply data.
apply);
}),
// multicast the result so multiple subscribers can share.
// and Replay last result if later subscriber looks for the result.
multicast(new ReplaySubject(1)),
// keep the reference count so publish observable active.
refCount());
// override subscribe call to keep track subscription.
publish.subscribe = ((next, error, complete, recoverSubscription) => {
if (this.delayTimer) {
clearTimeout(this.delayTimer);
this.delayTimer = null;
if (this.options && this.options.interval) {
this.options.interval = null;
}
}
// override default handler with No-OP call if not set.
// this allows all subscribe call to be get called when an error reported.
next = next || MsftSme.noop;
error = error || MsftSme.noop;
const context = { next, error, complete, errorCount: 0, unsubscribeCount: 0 };
const hookError = (errorData) => {
context.errorCount++;
error(errorData);
};
context.subscription = Object.getPrototypeOf(publish).subscribe.call(publish, next, hookError, complete);
// hook up old subscription so old subscriber can unsubscribe properly.
if (recoverSubscription) {
recoverSubscription.unsubscribe = () => context.subscription.unsubscribe();
}
// add subscribers to the inventory before adding to the un-subscription list. add() could call unsubscribe immediately.
subscribers.push(context);
// add internal unsubscribe to the original subscription.
context.subscription.add(this.internalUnsubscribe.bind(this, context));
// if createObservable() is called with autoFetchOptions, it start fetching data immediately when subscribe() is called.
if (this.autoFetchOptions) {
this.fetch(this.autoFetchOptions);
this.autoFetchOptions = null;
}
if (this.name) {
this.log(`subscribe count=${subscribers.length}`);
}
return context.subscription;
});
return publish;
}
internalUnsubscribe(context) {
context.unsubscribeCount++;
if (context.unsubscribeCount > 1) {
// ignore if it's called twice and more.
return;
}
if (!this.cachedData) {
return;
}
const options = this.options || {};
if (options.enableRecovery) {
// indicating normal unsubscribe call, so delete it.
if (context.errorCount === 0) {
const contextIndex = this.cachedData.subscribers.indexOf(context);
if (contextIndex >= 0) {
this.cachedData.subscribers.splice(contextIndex, 1);
}
}
// on the recovery mode, retains all subscriber context, and don't clean up.
// if there no active subscription, make cleanup call.
const findAny = this.cachedData.subscribers.find(item => !item.subscription.closed);
if (!findAny) {
if (options.delayClean) {
this.delayTimer = setTimeout(() => {
this.cleanup(true);
this.delayTimer = null;
}, QueryCache.delayTime);
}
else {
this.cleanup(true);
}
}
return;
}
// non recovery mode.
const index = this.cachedData.subscribers.indexOf(context);
if (index >= 0) {
this.cachedData.subscribers.splice(index, 1);
}
if (this.cachedData.subscribers.length === 0) {
if (options.delayClean) {
this.delayTimer = setTimeout(() => {
this.cleanup(false);
this.delayTimer = null;
}, QueryCache.delayTime);
}
else {
this.cleanup(false);
}
}
}
cleanup(recovery) {
if (this.name) {
this.log('unsubscribed');
}
this.repeaterStop();
if (!this.cachedData) {
return;
}
if (this.cachedData.fetch) {
this.cachedData.fetch.complete();
this.cachedData.fetch = null;
}
if (this.cachedData.refresh) {
this.cachedData.refresh.complete();
this.cachedData.refresh = null;
}
if (this.cachedData.apply) {
this.cachedData.apply.complete();
this.cachedData.apply = null;
}
this.cachedData.publish = null;
this.key = null;
// on recovery cleanup, retain subscribers and options.
if (!recovery) {
this.cachedData.subscribers = null;
this.cachedData = null;
this.options = {};
}
if (this.destroy) {
this.destroy();
}
}
/**
* Repeat observable.
* Using free running interval to avoid setTimeout recursive or Observable.expand recursive stacks.
* It reduces the usage of browser memory but use more frequent timer event as pulse in the code.
*/
repeat() {
if (QueryCache.id < 10000) {
// Legacy code pattern which use expand/recursive/setTimeout
// submit initial query.
return this.create(this.options.params)
// expand to re-query next interval
.pipe(expand((result) => {
if (!this.options.interval || this.options.interval <= 0) {
// stop the interval delay.
return EMPTY;
}
// return new observable after the delay.
return of(result)
.pipe(
// delay for the interval.
delay(this.options.interval),
// complete previous observable and switch to new observable.
switchMap(() => this.create(this.options.params)));
}));
}
this.repeaterStop();
if (!this.options.interval) {
// single observable. (no repeat)
return this.create(this.options.params);
}
// create new observable to repeat calling repeaterCreate() function.
return new Observable((observer) => {
this.observer = observer;
this.repeaterInitialize();
this.repeaterStart();
return () => {
// either closed by unsubscribe or observer is completed.
this.observer?.complete();
this.observer = null;
this.repeaterStop();
};
});
}
repeaterInitialize() {
if (this.options.interval < 1000) {
// min 1 sec interval.
this.options.interval = 1000;
}
// 100 or 200 or 1000 pulse.
const pulse = this.options.interval <= 5000 ? 100 : (this.options.interval <= 10000 ? 200 : 1000);
const cycle = Math.floor(this.options.interval / pulse);
this.repeaterContext = {
counter: 0,
request: QueryCache.repeaterParked,
timer: 0,
pulse,
cycle,
verify: 0
};
}
repeaterStart() {
// run first query.
this.repeaterCreate();
// start interval counter is incremented but cycled by cycle number.
// if it hits request === counter, call this.repeaterCreate();
this.repeaterContext.timer = setInterval(this.repeaterCheck.bind(this), this.repeaterContext.pulse);
}
repeaterStop() {
if (!this.repeaterContext) {
return;
}
if (this.repeaterContext.timer) {
clearInterval(this.repeaterContext.timer);
this.repeaterContext.timer = null;
}
this.repeaterContext.request = QueryCache.repeaterParked;
this.repeaterContext.verify = 0;
this.repeaterContext.counter = 0;
}
repeaterCreate() {
if (!this.observer) {
this.repeaterStop();
return;
}
if (!this.options.interval) {
if (this.observer) {
this.observer.complete();
this.observer = null;
}
this.repeaterStop();
return;
}
// subscribe to the create observable with params passed.
this.create(this.options.params)
.subscribe({
next: data => {
this.observer?.next(data);
},
error: error => {
this.observer?.error(error);
this.repeaterStop();
},
complete: () => {
if (!this.options.interval) {
// complete if the interval was reset.
if (this.observer) {
this.observer.complete();
this.observer = null;
}
this.repeaterStop();
return;
}
if (this.name) {
this.log(`repeat: request=${this.repeaterContext.request}, counter=${this.repeaterContext.counter}`);
}
// set next request counter number if it's parked.
if (this.repeaterContext.request === QueryCache.repeaterParked) {
this.repeaterContext.request = this.repeaterContext.counter;
}
}
});
}
repeaterCheck() {
if (this.repeaterContext.request === QueryCache.repeaterParked) {
return;
}
// update cycle counter
this.repeaterContext.counter = ++this.repeaterContext.counter % this.repeaterContext.cycle;
// update verify counter which starts from 0 to cycle.
this.repeaterContext.verify++;
// check if it hits a cycle.
if (this.repeaterContext.counter === this.repeaterContext.request) {
// wait for repeatCreate observable to complete. reset verify counter first before activate the observable.
this.repeaterContext.request = QueryCache.repeaterParked;
this.repeaterContext.verify = 0;
this.repeaterCreate();
}
else if (this.repeaterContext.verify > this.repeaterContext.cycle + 1) {
throw new Error('QueryCache: Cycle counter running over. cycle={0}, counter={1}, request={2}, verify={3}'.format(this.repeaterContext.cycle, this.repeaterContext.counter, this.repeaterContext.request, this.repeaterContext.verify));
}
}
}
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