@tanstack/db/dist/cjs/query/live/collection-subscriber.cjs

A reactive client store for building super fast apps on sync

"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const expressions = require("../compiler/expressions.cjs");
const orderedSourceLoader = require("./ordered-source-loader.cjs");
const utils = require("./utils.cjs");
const subsetDemandController = require("./subset-demand-controller.cjs");
class CollectionSubscriber {
  constructor(sourceId, alias, collection, collectionConfigBuilder) {
    this.sourceId = sourceId;
    this.alias = alias;
    this.collection = collection;
    this.fQ = collectionConfigBuilder;
    this.az = /* @__PURE__ */ new Map();
    this.fh = /* @__PURE__ */ new Map();
    this.demand = new subsetDemandController.SubsetDemandController();
  }
  subscribe() {
    const whereClause = this.fQ.sourceWhereClausesCache?.get(this.sourceId);
    return this.fi(
      whereClause ? expressions.normalizeExpressionPaths(whereClause, this.alias) : void 0
    );
  }
  fi(whereExpression) {
    const orderByInfo = this.fQ.optimizableOrderByCollections[this.sourceId];
    const trackLoadResult = (result) => {
      if (result instanceof Promise) {
        const trackedResult = result.catch(async (error) => {
          await Promise.resolve();
          throw error;
        });
        this.fQ.trackSubsetLoadPromise(trackedResult);
      }
    };
    const onStatusChange = (event) => {
      if (this.fQ.isLazySource(this.sourceId)) return;
      const subscription2 = event.subscription;
      if (event.status === `loadingSubset`) {
        this.d$(subscription2);
      } else {
        const deferred = this.az.get(subscription2);
        if (deferred) {
          this.az.delete(subscription2);
          deferred.resolve();
        }
      }
    };
    const onLoadSubsetError = (event) => {
      this.fQ.recordSubsetError(
        event.error,
        // Lazy demand owns its fatal-error path. For eager sources, one
        // successful page does not finish initial ordered refinement.
        !this.fQ.isLazySource(this.sourceId) && this.fQ.liveQueryCollection?.status === `loading`
      );
    };
    let subscription;
    if (orderByInfo) {
      subscription = this.da(
        whereExpression,
        orderByInfo,
        onStatusChange,
        trackLoadResult,
        onLoadSubsetError
      );
    } else {
      const includeInitialState = (this.collection.config.syncMode !== `on-demand` || this.fQ.query.limit !== 0) && !this.fQ.isLazySource(this.sourceId);
      subscription = this.ek(
        whereExpression,
        includeInitialState,
        onStatusChange,
        trackLoadResult,
        onLoadSubsetError
      );
      this.cQ(subscription);
    }
    if (!this.fQ.isLazySource(this.sourceId) && subscription.status === `loadingSubset`) {
      this.d$(subscription);
    }
    return subscription;
  }
  cQ(subscription) {
    const unsubscribe = () => {
      const deferred = this.az.get(subscription);
      if (deferred) {
        this.az.delete(subscription);
        deferred.resolve();
      }
      try {
        this.demand.clear();
      } finally {
        subscription.unsubscribe();
      }
    };
    this.fQ.currentSyncState.unsubscribeCallbacks.add(
      unsubscribe
    );
  }
  setDemand(subscription, plan, keys) {
    let update;
    try {
      update = this.demand.setDemand(subscription, plan, keys);
    } catch (error) {
      if (!Object.is(subscription.lastError, error)) throw error;
      const isInitialSync = this.fQ.liveQueryCollection?.status === `loading`;
      const generation2 = this.fQ.beginDemand(plan.id);
      this.fQ.failDemand(plan.id, generation2, error);
      if (isInitialSync) throw error;
      return;
    }
    if (!update.changed) return;
    if (update.empty) {
      this.fQ.retireDemand(plan.id);
      return;
    }
    const generation = this.fQ.beginDemand(
      plan.id,
      update.ready instanceof Promise
    );
    if (update.ready instanceof Promise) {
      void update.ready.then(
        () => this.fQ.settleDemand(plan.id, generation),
        (error) => this.fQ.failDemand(plan.id, generation, error)
      );
    } else {
      this.fQ.settleDemand(plan.id, generation);
    }
  }
  dV(changes) {
    const changesArray = Array.isArray(changes) ? changes : [...changes];
    const reconciledChanges = utils.reconcileChangesForD2(
      changesArray,
      this.fh
    );
    const input = this.fQ.currentSyncState.inputs[this.sourceId];
    if (utils.sendChangesToInput(input, reconciledChanges) > 0) {
      this.fQ.advanceGraphInputRevision();
    }
    this.fQ.scheduleGraphRun();
  }
  ek(whereExpression, includeInitialState, onStatusChange, onLoadSubsetResult, onLoadSubsetError) {
    const sendChanges = (changes) => {
      this.dV(changes);
    };
    const hints = utils.computeSubscriptionOrderByHints(
      this.fQ.query,
      this.alias,
      this.fQ.queryCompareOptions
    );
    const subscription = this.collection.subscribeChanges(sendChanges, {
      ...includeInitialState && { includeInitialState },
      whereExpression,
      onStatusChange,
      onLoadSubsetError,
      truncateReplayPublication: this.ci(),
      orderBy: hints.orderBy,
      limit: hints.limit,
      onLoadSubsetResult: includeInitialState ? onLoadSubsetResult : void 0
    });
    return subscription;
  }
  da(whereExpression, orderByInfo, onStatusChange, onLoadSubsetResult, onLoadSubsetError) {
    const subscriptionHolder = {};
    const sendChangesInRange = (changes) => {
      const subscription2 = subscriptionHolder.current;
      if (!subscription2) return;
      const changesArray = Array.isArray(changes) ? changes : [...changes];
      this.bk?.onSourceChanges(changesArray, this.fh);
      const splittedChanges = utils.splitUpdates(changesArray);
      this.dV(splittedChanges);
    };
    const subscription = this.collection.subscribeChanges(sendChangesInRange, {
      whereExpression,
      onStatusChange,
      onLoadSubsetError,
      truncateReplayPublication: this.ci(() => {
        const loader = this.bk;
        this.fQ.trackOrderedLoadPromise(
          Promise.resolve().then(() => loader?.loadFullSource()),
          true
        );
      })
    });
    subscriptionHolder.current = subscription;
    this.cQ(subscription);
    const truncateUnsubscribe = this.collection.on(`truncate`, () => {
      this.bk?.resetCursor();
    });
    subscription.on(`unsubscribed`, () => {
      truncateUnsubscribe();
      subscriptionHolder.current = void 0;
      this.bk?.dispose();
      this.bk = void 0;
    });
    this.bk = new orderedSourceLoader.OrderedSourceLoader(
      orderByInfo,
      subscription,
      this.alias,
      (result, holdPublication, settlesAsync) => {
        if (result instanceof Promise) {
          this.fQ.trackOrderedLoadPromise(
            result,
            holdPublication && settlesAsync && !subscription.hasPendingTruncateReplacement
          );
        }
        onLoadSubsetResult(result);
      },
      () => this.fQ.liveQueryCollection?.status === `ready` && !this.fQ.hasActiveWindowOperation(),
      () => this.fQ.getGraphInputRevision(),
      () => orderByInfo.joinedFilterSourceId !== void 0 && this.fQ.hasPendingJoinedWork(
        orderByInfo.joinedFilterSourceId
      )
    );
    this.bk.start();
    return subscription;
  }
  ci(onStart) {
    const syncRunGeneration = this.fQ.getSyncRunGeneration();
    return {
      start: () => {
        onStart?.();
      },
      succeed: () => {
        if (syncRunGeneration !== this.fQ.getSyncRunGeneration()) {
          return;
        }
        this.bk?.settleFullSourceReplay();
        this.fQ.scheduleGraphRunIfSyncRunCurrent(
          syncRunGeneration
        );
      }
    };
  }
  // This function is called by maybeRunGraph
  // after each iteration of the query pipeline
  // to ensure that the orderBy operator has enough data to work with
  loadMoreIfNeeded(subscription) {
    if (subscription.hasPendingTruncateReplacement && !this.fQ.hasActiveWindowOperation()) {
      return;
    }
    const orderByInfo = this.fQ.optimizableOrderByCollections[this.sourceId];
    if (!orderByInfo) {
      return;
    }
    try {
      const pending = this.bk?.loadMore(
        this.fQ.getActiveWindowOperationGeneration()
      );
      if (pending) {
        this.fQ.trackSubsetLoadOperationPromise(pending);
      }
    } catch (error) {
      if (!Object.is(subscription.lastError, error)) throw error;
    }
  }
  d$(subscription) {
    if (this.az.has(subscription)) {
      return;
    }
    let resolve;
    const promise = new Promise((res) => {
      resolve = res;
    });
    this.az.set(subscription, {
      resolve
    });
    this.fQ.trackSubsetLoadPromise(promise);
  }
}
exports.CollectionSubscriber = CollectionSubscriber;
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