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The MongoDB Asynchronous Driver
/*
* Copyright 2015 MongoDB, Inc.
*
* 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.
*/
package com.mongodb.async.client.gridfs;
import com.mongodb.MongoGridFSException;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.WriteConcern;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.async.client.MongoClients;
import com.mongodb.async.client.MongoCollection;
import com.mongodb.async.client.MongoDatabase;
import com.mongodb.client.gridfs.model.GridFSDownloadOptions;
import com.mongodb.client.gridfs.model.GridFSFile;
import com.mongodb.client.gridfs.model.GridFSUploadOptions;
import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;
import com.mongodb.diagnostics.logging.Logger;
import com.mongodb.diagnostics.logging.Loggers;
import org.bson.BsonDocument;
import org.bson.BsonObjectId;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.bson.types.ObjectId;
import java.io.IOException;
import java.nio.ByteBuffer;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;
import static java.lang.String.format;
import static org.bson.codecs.configuration.CodecRegistries.fromRegistries;
final class GridFSBucketImpl implements GridFSBucket {
private static final Logger LOGGER = Loggers.getLogger("client.gridfs");
private static final int DEFAULT_CHUNKSIZE_BYTES = 255 * 1024;
private static final int DEFAULT_BUFFER_SIZE = 1024 * 1024 * 4;
private final String bucketName;
private final int chunkSizeBytes;
private final MongoCollection filesCollection;
private final MongoCollection chunksCollection;
GridFSBucketImpl(final MongoDatabase database) {
this(database, "fs");
}
GridFSBucketImpl(final MongoDatabase database, final String bucketName) {
this(notNull("bucketName", bucketName), DEFAULT_CHUNKSIZE_BYTES,
getFilesCollection(notNull("database", database), bucketName),
getChunksCollection(database, bucketName));
}
GridFSBucketImpl(final String bucketName, final int chunkSizeBytes, final MongoCollection filesCollection,
final MongoCollection chunksCollection) {
this.bucketName = notNull("bucketName", bucketName);
this.chunkSizeBytes = chunkSizeBytes;
this.filesCollection = notNull("filesCollection", filesCollection);
this.chunksCollection = notNull("chunksCollection", chunksCollection);
}
@Override
public String getBucketName() {
return bucketName;
}
@Override
public int getChunkSizeBytes() {
return chunkSizeBytes;
}
@Override
public ReadPreference getReadPreference() {
return filesCollection.getReadPreference();
}
@Override
public WriteConcern getWriteConcern() {
return filesCollection.getWriteConcern();
}
@Override
public ReadConcern getReadConcern() {
return filesCollection.getReadConcern();
}
@Override
public GridFSBucket withChunkSizeBytes(final int chunkSizeBytes) {
return new GridFSBucketImpl(bucketName, chunkSizeBytes, filesCollection, chunksCollection);
}
@Override
public GridFSBucket withReadPreference(final ReadPreference readPreference) {
notNull("readPreference", readPreference);
return new GridFSBucketImpl(bucketName, chunkSizeBytes, filesCollection.withReadPreference(readPreference),
chunksCollection.withReadPreference(readPreference));
}
@Override
public GridFSBucket withWriteConcern(final WriteConcern writeConcern) {
notNull("writeConcern", writeConcern);
return new GridFSBucketImpl(bucketName, chunkSizeBytes, filesCollection.withWriteConcern(writeConcern),
chunksCollection.withWriteConcern(writeConcern));
}
@Override
public GridFSBucket withReadConcern(final ReadConcern readConcern) {
notNull("readConcern", readConcern);
return new GridFSBucketImpl(bucketName, chunkSizeBytes, filesCollection.withReadConcern(readConcern),
chunksCollection.withReadConcern(readConcern));
}
@Override
public GridFSUploadStream openUploadStream(final String filename) {
return openUploadStream(new BsonObjectId(), filename);
}
@Override
public GridFSUploadStream openUploadStream(final String filename, final GridFSUploadOptions options) {
return openUploadStream(new BsonObjectId(), filename, options);
}
@Override
public GridFSUploadStream openUploadStream(final BsonValue id, final String filename) {
return openUploadStream(id, filename, new GridFSUploadOptions());
}
@Override
public GridFSUploadStream openUploadStream(final BsonValue id, final String filename, final GridFSUploadOptions options) {
notNull("filename", filename);
int chunkSize = options.getChunkSizeBytes() == null ? chunkSizeBytes : options.getChunkSizeBytes();
return new GridFSUploadStreamImpl(filesCollection, chunksCollection, id, filename, chunkSize, options.getMetadata(),
new GridFSIndexCheckImpl(filesCollection, chunksCollection));
}
@Override
public void uploadFromStream(final String filename, final AsyncInputStream source, final SingleResultCallback callback) {
uploadFromStream(filename, source, new GridFSUploadOptions(), callback);
}
@Override
public void uploadFromStream(final String filename, final AsyncInputStream source, final GridFSUploadOptions options,
final SingleResultCallback callback) {
final BsonObjectId id = new BsonObjectId();
uploadFromStream(id, filename, source, options, new SingleResultCallback() {
@Override
public void onResult(final Void result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
callback.onResult(id.getValue(), null);
}
}
});
}
@Override
public void uploadFromStream(final BsonValue id, final String filename, final AsyncInputStream source,
final SingleResultCallback callback) {
uploadFromStream(id, filename, source, new GridFSUploadOptions(), callback);
}
@Override
public void uploadFromStream(final BsonValue id, final String filename, final AsyncInputStream source,
final GridFSUploadOptions options, final SingleResultCallback callback) {
notNull("filename", filename);
notNull("source", source);
notNull("options", options);
notNull("callback", callback);
int chunkSize = options.getChunkSizeBytes() == null ? chunkSizeBytes : options.getChunkSizeBytes();
readAndWriteInputStream(source, openUploadStream(id, filename, options), ByteBuffer.allocate(chunkSize),
errorHandlingCallback(callback, LOGGER));
}
@Override
public GridFSDownloadStream openDownloadStream(final ObjectId id) {
notNull("id", id);
return new GridFSDownloadStreamImpl(find(new Document("_id", id)), chunksCollection);
}
@Override
public void downloadToStream(final ObjectId id, final AsyncOutputStream destination, final SingleResultCallback callback) {
notNull("id", id);
notNull("destination", destination);
notNull("callback", callback);
downloadToAsyncOutputStream(openDownloadStream(id), destination, errorHandlingCallback(callback, LOGGER));
}
@Override
public GridFSDownloadStream openDownloadStream(final BsonValue id) {
notNull("id", id);
return new GridFSDownloadStreamImpl(find(new Document("_id", id)), chunksCollection);
}
@Override
public void downloadToStream(final BsonValue id, final AsyncOutputStream destination, final SingleResultCallback callback) {
notNull("id", id);
notNull("destination", destination);
notNull("callback", callback);
downloadToAsyncOutputStream(openDownloadStream(id), destination, errorHandlingCallback(callback, LOGGER));
}
@Override
public GridFSDownloadStream openDownloadStream(final String filename) {
return openDownloadStream(filename, new GridFSDownloadOptions());
}
@Override
public GridFSDownloadStream openDownloadStream(final String filename, final GridFSDownloadOptions options) {
notNull("filename", filename);
notNull("options", options);
return new GridFSDownloadStreamImpl(findFileByName(filename, options), chunksCollection);
}
@Override
public void downloadToStream(final String filename, final AsyncOutputStream destination,
final SingleResultCallback callback) {
downloadToStream(filename, destination, new GridFSDownloadOptions(), callback);
}
@Override
public void downloadToStream(final String filename, final AsyncOutputStream destination,
final GridFSDownloadOptions options, final SingleResultCallback callback) {
notNull("filename", filename);
notNull("destination", destination);
notNull("options", options);
notNull("callback", callback);
downloadToAsyncOutputStream(openDownloadStream(filename, options), destination, errorHandlingCallback(callback, LOGGER));
}
@Override
public GridFSFindIterable find() {
return new GridFSFindIterableImpl(filesCollection.find());
}
@Override
public GridFSFindIterable find(final Bson filter) {
notNull("filter", filter);
return new GridFSFindIterableImpl(filesCollection.find(filter));
}
@Override
public void delete(final ObjectId id, final SingleResultCallback callback) {
delete(new BsonObjectId(id), callback);
}
@Override
public void delete(final BsonValue id, final SingleResultCallback callback) {
notNull("id", id);
notNull("callback", callback);
final SingleResultCallback errHandlingCallback = errorHandlingCallback(callback, LOGGER);
filesCollection.deleteOne(new BsonDocument("_id", id), new SingleResultCallback() {
@Override
public void onResult(final DeleteResult filesResult, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else {
chunksCollection.deleteMany(new BsonDocument("files_id", id),
new SingleResultCallback() {
@Override
public void onResult(final DeleteResult chunksResult, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else if (filesResult.wasAcknowledged() && filesResult.getDeletedCount() == 0) {
errHandlingCallback.onResult(null,
new MongoGridFSException(format("No file found with the ObjectId: %s", id)));
} else {
errHandlingCallback.onResult(null, null);
}
}
});
}
}
});
}
@Override
public void rename(final ObjectId id, final String newFilename, final SingleResultCallback callback) {
rename(new BsonObjectId(id), newFilename, callback);
}
@Override
public void rename(final BsonValue id, final String newFilename, final SingleResultCallback callback) {
notNull("id", id);
notNull("newFilename", newFilename);
notNull("callback", callback);
final SingleResultCallback errHandlingCallback = errorHandlingCallback(callback, LOGGER);
filesCollection.updateOne(new BsonDocument("_id", id), new BsonDocument("$set",
new BsonDocument("filename", new BsonString(newFilename))),
new SingleResultCallback() {
@Override
public void onResult(final UpdateResult result, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else if (result.wasAcknowledged() && result.getMatchedCount() == 0) {
errHandlingCallback.onResult(null, new MongoGridFSException(format("No file found with the ObjectId: %s",
id)));
} else {
errHandlingCallback.onResult(null, null);
}
}
});
}
@Override
public void drop(final SingleResultCallback callback) {
notNull("callback", callback);
final SingleResultCallback errHandlingCallback = errorHandlingCallback(callback, LOGGER);
filesCollection.drop(new SingleResultCallback() {
@Override
public void onResult(final Void result, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else {
chunksCollection.drop(errHandlingCallback);
}
}
});
}
private GridFSFindIterable findFileByName(final String filename, final GridFSDownloadOptions options) {
int revision = options.getRevision();
int skip;
int sort;
if (revision >= 0) {
skip = revision;
sort = 1;
} else {
skip = (-revision) - 1;
sort = -1;
}
return new GridFSFindIterableImpl(filesCollection.find(new Document("filename", filename)).skip(skip)
.sort(new Document("uploadDate", sort)));
}
private static MongoCollection getFilesCollection(final MongoDatabase database, final String bucketName) {
return database.getCollection(bucketName + ".files", GridFSFile.class).withCodecRegistry(
fromRegistries(database.getCodecRegistry(), MongoClients.getDefaultCodecRegistry())
);
}
private static MongoCollection getChunksCollection(final MongoDatabase database, final String bucketName) {
return database.getCollection(bucketName + ".chunks").withCodecRegistry(MongoClients.getDefaultCodecRegistry());
}
private void downloadToAsyncOutputStream(final GridFSDownloadStream downloadStream, final AsyncOutputStream destination,
final SingleResultCallback callback) {
downloadStream.getGridFSFile(new SingleResultCallback() {
@Override
public void onResult(final GridFSFile result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
int bufferSize = DEFAULT_BUFFER_SIZE > result.getLength() ? (int) result.getLength() : DEFAULT_BUFFER_SIZE;
readAndWriteOutputStream(destination, downloadStream, ByteBuffer.allocate(bufferSize), 0, callback);
}
}
});
}
private void readAndWriteInputStream(final AsyncInputStream source, final GridFSUploadStream uploadStream, final ByteBuffer buffer,
final SingleResultCallback callback) {
buffer.clear();
source.read(buffer, new SingleResultCallback() {
@Override
public void onResult(final Integer result, final Throwable t) {
if (t != null) {
if (t instanceof IOException) {
uploadStream.abort(new SingleResultCallback() {
@Override
public void onResult(final Void result, final Throwable abortException) {
if (abortException != null) {
callback.onResult(null, abortException);
} else {
callback.onResult(null, new MongoGridFSException("IOException when reading from the InputStream", t));
}
}
});
} else {
callback.onResult(null, t);
}
} else if (result > 0) {
buffer.flip();
uploadStream.write(buffer, new SingleResultCallback() {
@Override
public void onResult(final Integer result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
readAndWriteInputStream(source, uploadStream, buffer, callback);
}
}
});
} else {
uploadStream.close(callback);
}
}
});
}
private void readAndWriteOutputStream(final AsyncOutputStream destination, final GridFSDownloadStream downloadStream,
final ByteBuffer buffer, final long amountRead, final SingleResultCallback callback) {
buffer.clear();
downloadStream.read(buffer, new SingleResultCallback() {
@Override
public void onResult(final Integer readResult, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else if (readResult > 0) {
buffer.flip();
destination.write(buffer, new SingleResultCallback() {
@Override
public void onResult(final Integer writeResult, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
readAndWriteOutputStream(destination, downloadStream, buffer, amountRead + writeResult, callback);
}
}
});
} else {
callback.onResult(amountRead, null);
}
}
});
}
}
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