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This value is set based on whether the last execution returned a continuation token.\n *\n * @returns Boolean value representing if whether there are potentially additional results that can be retrieved.\n */\n get hasMoreResults(): boolean {\n return this.lastStatusCode !== StatusCodes.NotModified;\n }\n\n /**\n * Gets an async iterator which will yield pages of results from Azure Cosmos DB.\n */\n public async *getAsyncIterator(): AsyncIterable<ChangeFeedResponse<Array<T & Resource>>> {\n do {\n const result = await this.fetchNext();\n if (result.count > 0) {\n yield result;\n }\n } while (this.hasMoreResults);\n }\n\n /**\n * Read feed and retrieves the next page of results in Azure Cosmos DB.\n */\n public async fetchNext(): Promise<ChangeFeedResponse<Array<T & Resource>>> {\n const response = await this.getFeedResponse();\n this.lastStatusCode = response.statusCode;\n this.nextIfNoneMatch = response.headers[Constants.HttpHeaders.ETag];\n return response;\n }\n\n private async getFeedResponse(): Promise<ChangeFeedResponse<Array<T & Resource>>> {\n if (!this.isPartitionSpecified) {\n throw new Error(\n \"Container is partitioned, but no partition key or partition key range id was specified.\"\n );\n }\n const feedOptions: FeedOptions = { initialHeaders: {}, useIncrementalFeed: true };\n\n if (typeof this.changeFeedOptions.maxItemCount === \"number\") {\n feedOptions.maxItemCount = this.changeFeedOptions.maxItemCount;\n }\n\n if (this.changeFeedOptions.sessionToken) {\n feedOptions.sessionToken = this.changeFeedOptions.sessionToken;\n }\n\n if (this.nextIfNoneMatch) {\n feedOptions.accessCondition = {\n type: Constants.HttpHeaders.IfNoneMatch,\n condition: this.nextIfNoneMatch,\n };\n }\n\n if (this.ifModifiedSince) {\n feedOptions.initialHeaders[Constants.HttpHeaders.IfModifiedSince] = this.ifModifiedSince;\n }\n\n const response: Response<Array<T & Resource>> = await (this.clientContext.queryFeed<T>({\n path: this.resourceLink,\n resourceType: ResourceType.item,\n resourceId: this.resourceId,\n resultFn: (result) => (result ? result.Documents : []),\n query: undefined,\n options: feedOptions,\n partitionKey: this.partitionKey,\n }) as Promise<any>); // TODO: some funky issues with query feed. Probably need to change it up.\n\n return new ChangeFeedResponse(\n response.result,\n response.result ? response.result.length : 0,\n response.code,\n response.headers\n );\n }\n}\n"]} |