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perf: increase performance when exporting large datasets
increase performance by avoid calling sheet.shiftRows() by duplicating the sheet into a temporal one, exporting the data and then appending the last part of the sheet before continuing with the footers
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src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /*- | ||
| * #%L | ||
| * Grid Exporter Add-on | ||
| * %% | ||
| * Copyright (C) 2022 - 2023 Flowing Code | ||
| * %% | ||
| * 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. | ||
| * #L% | ||
| */ | ||
| package com.flowingcode.vaadin.addons.gridexporter; | ||
|
|
||
| import java.io.IOException; | ||
| import java.math.BigDecimal; | ||
| import java.text.SimpleDateFormat; | ||
| import java.util.Calendar; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.IntStream; | ||
| import org.apache.poi.EncryptedDocumentException; | ||
| import com.flowingcode.vaadin.addons.demo.DemoSource; | ||
| import com.github.javafaker.Faker; | ||
| import com.vaadin.flow.component.grid.Grid; | ||
| import com.vaadin.flow.component.grid.Grid.Column; | ||
| import com.vaadin.flow.component.html.Div; | ||
| import com.vaadin.flow.router.PageTitle; | ||
| import com.vaadin.flow.router.Route; | ||
|
|
||
| @DemoSource | ||
| @PageTitle("Grid Exporter Addon Big Dataset Demo") | ||
| @Route(value = "gridexporter/bigdataset", layout = GridExporterDemoView.class) | ||
| @SuppressWarnings("serial") | ||
| public class GridExporterBigDatasetDemo extends Div { | ||
|
|
||
| public GridExporterBigDatasetDemo() throws EncryptedDocumentException, IOException { | ||
| Grid<Person> grid = new Grid<>(Person.class); | ||
| grid.removeAllColumns(); | ||
| grid.setColumnReorderingAllowed(true); | ||
| Column<Person> nameCol = grid.addColumn("name").setHeader("Name"); | ||
| Column<Person> lastNameCol = grid.addColumn("lastName").setHeader("Last Name"); | ||
| Column<Person> budgetCol = grid.addColumn(item -> "$" + item.getBudget()).setHeader("Budget"); | ||
| BigDecimal[] total = new BigDecimal[1]; | ||
| total[0] = BigDecimal.ZERO; | ||
| List<Person> persons = | ||
| IntStream.range(0, 7000) | ||
| .asLongStream() | ||
| .mapToObj( | ||
| number -> { | ||
| Faker faker = new Faker(); | ||
| Double budget = faker.number().randomDouble(2, 10000, 100000); | ||
| total[0] = total[0].add(BigDecimal.valueOf(budget)); | ||
| budgetCol.setFooter("$" + total[0]); | ||
| return new Person( | ||
| faker.name().firstName(), | ||
| faker.name().lastName(), | ||
| faker.number().numberBetween(15, 50), | ||
| budget); | ||
| }).collect(Collectors.toList()); | ||
| grid.setItems(query->persons.stream().skip(query.getOffset()).limit(query.getLimit())); | ||
| grid.setWidthFull(); | ||
| this.setSizeFull(); | ||
| GridExporter<Person> exporter = GridExporter.createFor(grid); | ||
| exporter.setExportValue(budgetCol, item -> "" + item.getBudget()); | ||
| exporter.setColumnPosition(lastNameCol, 1); | ||
| exporter.setTitle("People information"); | ||
| exporter.setFileName( | ||
| "GridExport" + new SimpleDateFormat("yyyyddMM").format(Calendar.getInstance().getTime())); | ||
| add(grid); | ||
| } | ||
| } |
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