// Copyright (c) 2023 The Jaeger Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. import { TraceSpan } from '../../types/trace'; /** * @returns - Returns the span that finished last among the remaining child spans. * If a `returningChildStartTime` is provided as a parameter, it returns the child span that finishes * just before the specified `returningChildStartTime`. */ const findLastFinishingChildSpan = ( spanMap: Map<string, TraceSpan>, currentSpan: TraceSpan, returningChildStartTime?: number ): TraceSpan | undefined => { let lastFinishingChildSpanId: string | undefined; if (returningChildStartTime) { lastFinishingChildSpanId = currentSpan?.childSpanIds.find( (each) => // Look up the span using the map spanMap.has(each) && spanMap.get(each)!.startTime + spanMap.get(each)!.duration < returningChildStartTime ); } else { // If `returningChildStartTime` is not provided, select the first child span. // As they are sorted based on endTime lastFinishingChildSpanId = currentSpan.childSpanIds[0]; } return lastFinishingChildSpanId ? spanMap.get(lastFinishingChildSpanId) : undefined; }; export default findLastFinishingChildSpan;