@azure/cosmos
Version:
Microsoft Azure Cosmos DB Service Node.js SDK for NOSQL API
66 lines • 2.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ChangeFeedIteratorBuilder = void 0;
const buildChangeFeedIterator_js_1 = require("./buildChangeFeedIterator.js");
const index_js_1 = require("../../request/index.js");
/**
* @hidden
* Provides iterator for change feed.
*
* Use `Items.getChangeFeedIterator()` to get an instance of the iterator.
*/
class ChangeFeedIteratorBuilder {
cfOptions;
clientContext;
container;
partitionKeyRangeCache;
iterator;
isInitialized;
/**
* @internal
*/
constructor(cfOptions, clientContext, container, partitionKeyRangeCache) {
this.cfOptions = cfOptions;
this.clientContext = clientContext;
this.container = container;
this.partitionKeyRangeCache = partitionKeyRangeCache;
this.isInitialized = false;
}
/**
* Change feed is an infinite feed. hasMoreResults is always true.
*/
get hasMoreResults() {
return true;
}
/**
* Gets an async iterator which will yield change feed results.
*/
async *getAsyncIterator() {
await this.initializeIterator();
do {
const result = await this.iterator.readNext();
yield result;
} while (this.hasMoreResults);
}
/**
* Returns the result of change feed from Azure Cosmos DB.
*/
async readNext() {
await this.initializeIterator();
return this.iterator.readNext();
}
async initializeIterator() {
if (!this.isInitialized) {
try {
const iterator = await (0, buildChangeFeedIterator_js_1.buildChangeFeedIterator)(this.cfOptions, this.clientContext, this.container, this.partitionKeyRangeCache);
this.isInitialized = true;
this.iterator = iterator;
}
catch (err) {
throw new index_js_1.ErrorResponse(err.message);
}
}
}
}
exports.ChangeFeedIteratorBuilder = ChangeFeedIteratorBuilder;
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