51Degrees Device Detection Java  4.2

Device detection services for 51Degrees Pipeline


Automatic updates example for 51Degrees device detection ‘Hash’ engine shows how to build a pipeline using the 51Degrees device detection pipeline builder and demonstrates the update on start up functionality. The automatic data file updates page explains the different options you can configure.

This example is available in full on GitHub.

This example requires a subscription to 51Degrees Device Data, a subscription can be acquired from the 51Degrees pricing page.

This example requires a local data file. Free data files can be acquired by pulling the submodules under this repository or from the device-detection-data GitHub repository.

Expected output:

Using data file at '51Degrees-LiteV4.1.hash'
Data file published date: 13/04/2020 00:00:00
Creating pipeline and updating device data.....
Data file published date: 02/07/2020 00:00:00
/* *********************************************************************
* This Original Work is copyright of 51 Degrees Mobile Experts Limited.
* Copyright 2019 51 Degrees Mobile Experts Limited, 5 Charlotte Close,
* Caversham, Reading, Berkshire, United Kingdom RG4 7BY.
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package fiftyone.devicedetection.examples.hash.automaticupdates;
import fiftyone.devicedetection.DeviceDetectionPipelineBuilder;
import fiftyone.devicedetection.examples.ExampleBase;
import fiftyone.devicedetection.examples.ProgramBase;
import fiftyone.devicedetection.hash.engine.onpremise.flowelements.DeviceDetectionHashEngine;
import fiftyone.devicedetection.hash.engine.onpremise.flowelements.DeviceDetectionHashEngineBuilder;
import fiftyone.pipeline.core.flowelements.Pipeline;
import fiftyone.pipeline.engines.services.DataUpdateService;
import fiftyone.pipeline.engines.services.DataUpdateService.DataUpdateCompleteArgs;
import fiftyone.pipeline.engines.services.DataUpdateServiceDefault;
import fiftyone.pipeline.engines.services.HttpClient;
import fiftyone.pipeline.engines.services.HttpClientDefault;
import fiftyone.pipeline.engines.services.OnUpdateComplete;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.slf4j.LoggerFactory;
public class UpdateOnStartUp extends ProgramBase {
public static void main(String[] args) throws Exception {
String dataFile = args.length > 0 ? args[0] :
String licenseKey = args.length > 1 ? args[1] :
"!!Your license key!!";
if(licenseKey.startsWith("!!")) {
System.out.println("You need a license key to run this example, "
+ "you can obtain one by subscribing to a 51Degrees bundle: "
+ "https://51degrees.com/pricing");
new Example(true).run(dataFile, licenseKey);
System.out.println("Complete. Press enter to exit.");
public static class Example extends ExampleBase {
public Example(boolean printOutput) {
public void run(String dataFile, String licenseKey) throws Exception {
println("Using data file at " + dataFile);
Date initialPublishedDate;
// Create a temporary Device Detection 'Hash' Engine to check the initial published date of the data file.
// There is no need to do this in production, it is for demonstration purposes only.
// This also higlights the added simplicity of the Device Detection Pipeline builder.
HttpClient httpClient = new HttpClientDefault();
try(DataUpdateService tmpDataUpdateService = new DataUpdateServiceDefault(
httpClient)) {
try(DeviceDetectionHashEngine deviceDetectionHashEngine = new DeviceDetectionHashEngineBuilder(
LoggerFactory.getILoggerFactory(), tmpDataUpdateService).build(dataFile, true)) {
// Get the published date of the device data file. Engines can have multiple data files but
// for the Device Detection 'Hash' engine we can guarantee there will only be one.
initialPublishedDate = deviceDetectionHashEngine.getDataFilePublishedDate();
println("Data file published date: " + initialPublishedDate.toString());
println("Creating pipeline and updating device data");
ExecutorService executor = Executors.newSingleThreadExecutor();
executor.submit(() -> {
try {
} catch (InterruptedException ex) {
// do nothing
DataUpdateService dataUpdateService = new DataUpdateServiceDefault(
dataUpdateService.onUpdateComplete(new GetAutoUpdateStatus());
// Build the device detection pipeline using the builder that comes with the
// fiftyone.devicedetection package and pass in the desired settings to configure
// automatic updates.
Pipeline pipeline = new DeviceDetectionPipelineBuilder(LoggerFactory.getILoggerFactory(), httpClient, dataUpdateService)
.useOnPremise(dataFile, true)
// For automatic updates to work you will need to provide a license key.
// A license key can be obtained with a subscription from https://51degrees.com/pricing
// Enable automatic updates.
// Watch the data file on disk and refresh the engine
// as soon as that file is updated.
// Enable update on startup, the auto update system
// will be used to check for an update before the
// device detection engine is created. This will block
// creation of the pipeline.
Date updatedPublishedDate = pipeline
println("There was no update available at this time.");
println("Data file published date: " + updatedPublishedDate.toString());
class GetAutoUpdateStatus implements OnUpdateComplete {
public void call(Object o, DataUpdateCompleteArgs duca) {
System.out.println("Update completed. Status " + duca.getStatus());