| // Licensed to Apache Software Foundation (ASF) under one or more contributor |
| // license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright |
| // ownership. Apache Software Foundation (ASF) licenses this file to you 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. |
| |
| package flow |
| |
| // Transmit provides a helper function to connect the current component with the downstream component. |
| // It should be run in another goroutine. |
| func Transmit(state *ComponentState, downstream Inlet, current Outlet) { |
| defer state.Done() |
| for elem := range current.Out() { |
| downstream.In() <- elem |
| } |
| close(downstream.In()) |
| } |
| |
| // TryExactTimestamp tries to get the timestamp from the item. |
| func TryExactTimestamp(item any) StreamRecord { |
| if r, ok := item.(StreamRecord); ok { |
| return r |
| } |
| type timestampExtractor interface { |
| TimestampMillis() int64 |
| } |
| // otherwise, check if we can extract timestamp |
| if extractor, ok := item.(timestampExtractor); ok { |
| return NewStreamRecord(item, extractor.TimestampMillis()) |
| } |
| return NewStreamRecordWithoutTS(item) |
| } |