use of reactivestreams.helpers.SubscriberHelpers.ConsumerSubscriber in project mongo-java-driver by mongodb.
the class GridFSTour method main.
/**
* Run this main method to see the output of this quick example.
*
* @param args takes an optional single argument for the connection string
* @throws FileNotFoundException if the sample file cannot be found
* @throws IOException if there was an exception closing an input stream
*/
public static void main(final String[] args) throws FileNotFoundException, IOException {
MongoClient mongoClient;
if (args.length == 0) {
// connect to the local database server
mongoClient = MongoClients.create();
} else {
mongoClient = MongoClients.create(args[0]);
}
// get handle to "mydb" database
MongoDatabase database = mongoClient.getDatabase("mydb");
ObservableSubscriber<Void> dropSubscriber = new OperationSubscriber<>();
database.drop().subscribe(dropSubscriber);
dropSubscriber.await();
GridFSBucket gridFSBucket = GridFSBuckets.create(database);
/*
* UploadFromPublisher Example
*/
// Get the input publisher
Publisher<ByteBuffer> publisherToUploadFrom = toPublisher(ByteBuffer.wrap("MongoDB Tutorial..".getBytes(StandardCharsets.UTF_8)));
// Create some custom options
GridFSUploadOptions options = new GridFSUploadOptions().chunkSizeBytes(1024).metadata(new Document("type", "presentation"));
ObservableSubscriber<ObjectId> uploadSubscriber = new OperationSubscriber<>();
gridFSBucket.uploadFromPublisher("mongodb-tutorial", publisherToUploadFrom, options).subscribe(uploadSubscriber);
ObjectId fileId = uploadSubscriber.get().get(0);
/*
* Find documents
*/
System.out.println("File names:");
ConsumerSubscriber<GridFSFile> filesSubscriber = new ConsumerSubscriber<>(gridFSFile -> System.out.println(" - " + gridFSFile.getFilename()));
gridFSBucket.find().subscribe(filesSubscriber);
filesSubscriber.await();
/*
* Find documents with a filter
*/
filesSubscriber = new ConsumerSubscriber<>(gridFSFile -> System.out.println("Found: " + gridFSFile.getFilename()));
gridFSBucket.find(eq("metadata.contentType", "image/png")).subscribe(filesSubscriber);
filesSubscriber.await();
/*
* DownloadToPublisher
*/
ObservableSubscriber<ByteBuffer> downloadSubscriber = new OperationSubscriber<>();
gridFSBucket.downloadToPublisher(fileId).subscribe(downloadSubscriber);
Integer size = downloadSubscriber.get().stream().map(Buffer::limit).reduce(0, Integer::sum);
System.out.println("downloaded file sized: " + size);
/*
* DownloadToStreamByName
*/
GridFSDownloadOptions downloadOptions = new GridFSDownloadOptions().revision(0);
downloadSubscriber = new OperationSubscriber<>();
gridFSBucket.downloadToPublisher("mongodb-tutorial", downloadOptions).subscribe(downloadSubscriber);
size = downloadSubscriber.get().stream().map(Buffer::limit).reduce(0, Integer::sum);
System.out.println("downloaded file sized: " + size);
/*
* Rename
*/
OperationSubscriber<Void> successSubscriber = new OperationSubscriber<>();
gridFSBucket.rename(fileId, "mongodbTutorial").subscribe(successSubscriber);
successSubscriber.await();
System.out.println("Renamed file");
/*
* Delete
*/
successSubscriber = new OperationSubscriber<>();
gridFSBucket.delete(fileId).subscribe(successSubscriber);
successSubscriber.await();
System.out.println("Deleted file");
// Final cleanup
successSubscriber = new OperationSubscriber<>();
database.drop().subscribe(successSubscriber);
successSubscriber.await();
System.out.println("Finished");
}
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