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javav2/example_code/dynamodb/src/main/java/com/example/dynamodb/BatchDeleteItems.java
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...example_code/s3/src/main/java/com/example/s3/transfermanager/S3DirectoriesDownloader.java
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| // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| package com.example.s3.transfermanager; | ||
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| // snippet-start:[s3.tm.java2.download-s3-directories.import] | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import software.amazon.awssdk.core.sync.RequestBody; | ||
| import software.amazon.awssdk.services.s3.model.ObjectIdentifier; | ||
| import software.amazon.awssdk.services.s3.model.S3Object; | ||
| import software.amazon.awssdk.transfer.s3.S3TransferManager; | ||
| import software.amazon.awssdk.transfer.s3.config.DownloadFilter; | ||
| import software.amazon.awssdk.transfer.s3.model.CompletedDirectoryDownload; | ||
| import software.amazon.awssdk.transfer.s3.model.DirectoryDownload; | ||
| import software.amazon.awssdk.transfer.s3.model.DownloadDirectoryRequest; | ||
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| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.net.URISyntaxException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.function.Predicate; | ||
| import java.util.stream.IntStream; | ||
| import java.util.Set; | ||
| import java.util.UUID; | ||
| import java.util.stream.Collectors; | ||
| // snippet-end:[s3.tm.java2.download-s3-directories.import] | ||
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| /** | ||
| * Before running this Java V2 code example, set up your development | ||
| * environment, including your credentials. | ||
| * | ||
| * For more information, see the following documentation topic: | ||
| * | ||
| * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html | ||
| */ | ||
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| public class S3DirectoriesDownloader { | ||
| private static final Logger logger = LoggerFactory.getLogger(S3DirectoriesDownloader.class); | ||
| public final String bucketName = "amzn-s3-demo-bucket" + UUID.randomUUID(); // Change bucket name. | ||
| public URI destinationPathURI; | ||
| private final Set<String> downloadedFileNameSet = new HashSet<>(); | ||
| private final String destinationDirName = "downloadDirectory"; | ||
| private final List<String> folderNames = List.of("folder1", "folder2", "folder3"); | ||
| private final List<String> filterFolderNames = List.of("folder1", "folder3"); | ||
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| public S3DirectoriesDownloader() { | ||
| setUp(); | ||
| } | ||
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| public static void main(String[] args) { | ||
| S3DirectoriesDownloader downloader = new S3DirectoriesDownloader(); | ||
| Integer numFilesFailedToDownload = null; | ||
| try { | ||
| numFilesFailedToDownload = downloader.downloadS3Directories(S3ClientFactory.transferManager, | ||
| downloader.destinationPathURI, downloader.bucketName); | ||
| logger.info("Number of files that failed to download [{}].", numFilesFailedToDownload); | ||
| } catch (Exception e) { | ||
| logger.error("Exception [{}]", e.getMessage(), e); | ||
| } finally { | ||
| downloader.cleanUp(); | ||
| } | ||
| } | ||
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| // snippet-start:[s3.tm.java2.download-s3-directories.main] | ||
| /** | ||
| * For standard buckets, S3 provides the illusion of a directory structure through the use of keys. When you upload | ||
| * an object to an S3 bucket, you specify a key, which is essentially the "path" to the object. The key can contain | ||
| * forward slashes ("/") to make it appear as if the object is stored in a directory structure, but this is just a | ||
| * logical representation, not an actual directory. | ||
| * <p><pre> | ||
| * In this example, our S3 bucket contains the following objects: | ||
| * | ||
| * folder1/file1.txt | ||
| * folder1/file2.txt | ||
| * folder1/file3.txt | ||
| * folder2/file1.txt | ||
| * folder2/file2.txt | ||
| * folder2/file3.txt | ||
| * folder3/file1.txt | ||
| * folder3/file2.txt | ||
| * folder3/file3.txt | ||
| * | ||
| * When method `downloadS3Directories` is invoked with | ||
| * `destinationPathURI` set to `/test`, the downloaded | ||
| * directory looks like: | ||
| * | ||
| * |- test | ||
| * |- folder1 | ||
| * |- file1.txt | ||
| * |- file2.txt | ||
| * |- file3.txt | ||
| * |- folder3 | ||
| * |- file1.txt | ||
| * |- file2.txt | ||
| * |- file3.txt | ||
| * </pre> | ||
| * | ||
| * @param transferManager An S3TransferManager instance. | ||
| * @param destinationPathURI local directory to hold the downloaded S3 'directories' and files. | ||
| * @param bucketName The S3 bucket that contains the 'directories' to download. | ||
| * @return The number of objects (files, in this case) that were downloaded. | ||
| */ | ||
| public Integer downloadS3Directories(S3TransferManager transferManager, | ||
| URI destinationPathURI, String bucketName) { | ||
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| // Define the filters for which 'directories' we want to download. | ||
| DownloadFilter folder1Filter = (S3Object s3Object) -> s3Object.key().startsWith("folder1/"); | ||
| DownloadFilter folder3Filter = (S3Object s3Object) -> s3Object.key().startsWith("folder3/"); | ||
| DownloadFilter folderFilter = s3Object -> folder1Filter.or(folder3Filter).test(s3Object); | ||
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| DirectoryDownload directoryDownload = transferManager.downloadDirectory(DownloadDirectoryRequest.builder() | ||
| .destination(Paths.get(destinationPathURI)) | ||
| .bucket(bucketName) | ||
| .filter(folderFilter) | ||
| .build()); | ||
| CompletedDirectoryDownload completedDirectoryDownload = directoryDownload.completionFuture().join(); | ||
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| Integer numFilesInFolder1 = Paths.get(destinationPathURI).resolve("folder1").toFile().list().length; | ||
| Integer numFilesInFolder3 = Paths.get(destinationPathURI).resolve("folder3").toFile().list().length; | ||
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| try { | ||
| assert numFilesInFolder1 == 3; | ||
| assert numFilesInFolder3 == 3; | ||
| assert !Paths.get(destinationPathURI).resolve("folder2").toFile().exists(); // `folder2` was not downloaded. | ||
| } catch (AssertionError e) { | ||
| logger.error("An assertion failed."); | ||
| } | ||
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| completedDirectoryDownload.failedTransfers() | ||
| .forEach(fail -> logger.warn("Object failed to transfer [{}]", fail.exception().getMessage())); | ||
| return numFilesInFolder1 + numFilesInFolder3; | ||
| } | ||
| // snippet-end:[s3.tm.java2.download-s3-directories.main] | ||
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| private void setUp() { | ||
| S3ClientFactory.s3Client.createBucket(b -> b.bucket(bucketName)); | ||
| S3ClientFactory.s3Waiter.waitUntilBucketExists(r -> r.bucket(bucketName)); | ||
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| RequestBody requestBody = RequestBody.fromString("Hello World."); | ||
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| folderNames.forEach(folderName -> | ||
| IntStream.rangeClosed(1, 3).forEach(i -> { | ||
| String fileName = folderName + "/" + "file" + i + ".txt"; | ||
| downloadedFileNameSet.add(fileName); | ||
| S3ClientFactory.s3Client.putObject(b -> b | ||
| .bucket(bucketName) | ||
| .key(fileName), | ||
| requestBody); | ||
| })); | ||
| try { | ||
| destinationPathURI = S3DirectoriesDownloader.class.getClassLoader().getResource(destinationDirName).toURI(); | ||
| } catch (URISyntaxException | NullPointerException e) { | ||
| logger.error("Exception creating URI [{}]", e.getMessage()); | ||
| System.exit(1); | ||
| } | ||
| } | ||
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| public void cleanUp() { | ||
| // Delete items uploaded to bucket for download. | ||
| Set<ObjectIdentifier> items = downloadedFileNameSet | ||
| .stream() | ||
| .map(name -> ObjectIdentifier.builder().key(name).build()) | ||
| .collect(Collectors.toSet()); | ||
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| S3ClientFactory.s3Client.deleteObjects(b -> b | ||
| .bucket(bucketName) | ||
| .delete(b1 -> b1.objects(items))); | ||
| // Delete bucket. | ||
| S3ClientFactory.s3Client.deleteBucket(b -> b.bucket(bucketName)); | ||
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| // Delete files downloaded. | ||
| Predicate<String> filterFolder1 = key -> key.startsWith("folder1"); | ||
| Predicate<String> filterFolder3 = key -> key.startsWith("folder3"); | ||
| Predicate<String> filterForFolders = filterFolder1.or(filterFolder3); | ||
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| downloadedFileNameSet.stream() | ||
| .filter(filterForFolders) | ||
| .forEach(fileName -> { | ||
| try { | ||
| Path basePath = Paths.get(destinationPathURI); | ||
| Path fullPath = basePath.resolve(fileName); | ||
| Files.delete(fullPath); | ||
| } catch (IOException e) { | ||
| logger.error("Exception deleting file [{}]", fileName); | ||
| } | ||
| }); | ||
| filterFolderNames.forEach(folderName -> { | ||
| try { | ||
| Path basePath = Paths.get(destinationPathURI); | ||
| Path fullPath = basePath.resolve(folderName); | ||
| Files.delete(fullPath); | ||
| } catch (IOException e) { | ||
| logger.error("Exception deleting folder [{}]", folderName); | ||
| } | ||
| }); | ||
| } | ||
| } |
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