@azure/cosmos
Version:
Microsoft Azure Cosmos DB Service Node.js SDK for NOSQL API
69 lines • 3.61 kB
JavaScript
;
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
Object.defineProperty(exports, "__esModule", { value: true });
exports.ParallelQueryExecutionContext = void 0;
const parallelQueryExecutionContextBase_js_1 = require("./parallelQueryExecutionContextBase.js");
const TargetPartitionRangeManager_js_1 = require("./queryFilteringStrategy/TargetPartitionRangeManager.js");
const ParallelQueryProcessingStrategy_js_1 = require("./queryProcessingStrategy/ParallelQueryProcessingStrategy.js");
/**
* Provides the ParallelQueryExecutionContext.
* This class is capable of handling parallelized queries and derives from ParallelQueryExecutionContextBase.
* @hidden
*/
class ParallelQueryExecutionContext extends parallelQueryExecutionContextBase_js_1.ParallelQueryExecutionContextBase {
constructor(clientContext, collectionLink, query, options, partitionedQueryExecutionInfo, correlatedActivityId) {
const rangeManager = TargetPartitionRangeManager_js_1.TargetPartitionRangeManager.createForParallelQuery({
queryInfo: partitionedQueryExecutionInfo,
});
// Create parallel query processing strategy
const processingStrategy = new ParallelQueryProcessingStrategy_js_1.ParallelQueryProcessingStrategy();
// Create comparator for document producers
const comparator = ParallelQueryExecutionContext.createDocumentProducerComparator();
// Calling on base class constructor
super(clientContext, collectionLink, query, options, partitionedQueryExecutionInfo, correlatedActivityId, rangeManager, processingStrategy, comparator);
}
/**
* Fetches all buffered items from producer for parallel processing.
*/
async fetchFromProducer(producer) {
return producer.fetchBufferedItems();
}
/**
* Determines if buffered producers should continue to be processed for parallel queries.
* For parallel queries, we process all buffered producers.
* @param _isUnfilledQueueEmpty - Whether the unfilled queue is empty (ignored for parallel queries)
* @hidden
*/
shouldProcessBufferedProducers(_isUnfilledQueueEmpty) {
return true; // Process all buffered items in parallel queries
}
/**
* Creates a comparator function for sorting document producers in parallel queries.
* Sorts by partition key range minInclusive values, with empty string first,
* then lexicographically. Uses EPK ranges as secondary sort when minInclusive values are identical.
*/
static createDocumentProducerComparator() {
return (docProd1, docProd2) => {
const aMinInclusive = docProd1.targetPartitionKeyRange.minInclusive;
const bMinInclusive = docProd2.targetPartitionKeyRange.minInclusive;
// Sort empty string first, then lexicographically (original logic)
if (aMinInclusive === bMinInclusive) {
// If minInclusive values are the same, check minEPK ranges if they exist
const aMinEpk = docProd1.startEpk;
const bMinEpk = docProd2.startEpk;
if (aMinEpk && bMinEpk) {
return aMinEpk < bMinEpk ? -1 : 1;
}
return 0;
}
if (aMinInclusive === "")
return -1;
if (bMinInclusive === "")
return 1;
return aMinInclusive < bMinInclusive ? -1 : 1;
};
}
}
exports.ParallelQueryExecutionContext = ParallelQueryExecutionContext;
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