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A Reactive Streams implementation of the MongoDB Java driver
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/*
* Copyright 2008-present 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.reactivestreams.client.internal.gridfs;
import com.mongodb.MongoGridFSException;
import com.mongodb.client.cursor.TimeoutMode;
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.UpdateResult;
import com.mongodb.internal.TimeoutContext;
import com.mongodb.internal.time.Timeout;
import com.mongodb.lang.Nullable;
import com.mongodb.reactivestreams.client.ClientSession;
import com.mongodb.reactivestreams.client.FindPublisher;
import com.mongodb.reactivestreams.client.MongoCollection;
import com.mongodb.reactivestreams.client.gridfs.GridFSFindPublisher;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import java.nio.ByteBuffer;
import java.util.function.Function;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.reactivestreams.client.internal.TimeoutHelper.collectionWithTimeout;
import static com.mongodb.reactivestreams.client.internal.TimeoutHelper.collectionWithTimeoutMono;
import static com.mongodb.reactivestreams.client.internal.TimeoutHelper.collectionWithTimeoutDeferred;
import static java.lang.String.format;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
/**
* This class is not part of the public API and may be removed or changed at any time
*/
public final class GridFSPublisherCreator {
private GridFSPublisherCreator() {
}
public static GridFSUploadPublisherImpl createGridFSUploadPublisher(
final int chunkSizeBytes, final MongoCollection filesCollection, final MongoCollection chunksCollection,
@Nullable final ClientSession clientSession, final BsonValue id, final String filename, final GridFSUploadOptions options,
final Publisher source) {
notNull("filesCollection", filesCollection);
notNull("chunksCollection", chunksCollection);
notNull("id", id);
notNull("filename", filename);
notNull("options", options);
Integer chunkSize = options.getChunkSizeBytes();
if (chunkSize == null) {
chunkSize = chunkSizeBytes;
}
return new GridFSUploadPublisherImpl(clientSession, filesCollection, chunksCollection, id, filename, chunkSize,
options.getMetadata(), source);
}
public static GridFSDownloadPublisherImpl createGridFSDownloadPublisher(
final MongoCollection chunksCollection,
@Nullable final ClientSession clientSession,
final Function publisher) {
notNull("chunksCollection", chunksCollection);
notNull("gridFSFileMono", publisher);
return new GridFSDownloadPublisherImpl(clientSession, publisher, chunksCollection);
}
public static GridFSFindPublisher createGridFSFindPublisher(
final MongoCollection filesCollection,
@Nullable final ClientSession clientSession,
@Nullable final Bson filter) {
notNull("filesCollection", filesCollection);
return new GridFSFindPublisherImpl(createFindPublisher(filesCollection, clientSession, filter));
}
public static GridFSFindPublisher createGridFSFindPublisher(
final MongoCollection filesCollection,
@Nullable final ClientSession clientSession,
@Nullable final Bson filter,
@Nullable final Timeout operationTimeout) {
notNull("filesCollection", filesCollection);
return new GridFSFindPublisherImpl(createFindPublisher(filesCollection, clientSession, filter, operationTimeout));
}
public static GridFSFindPublisher createGridFSFindPublisher(
final MongoCollection filesCollection,
@Nullable final ClientSession clientSession,
final String filename,
final GridFSDownloadOptions options,
@Nullable final Timeout operationTimeout) {
notNull("filesCollection", filesCollection);
notNull("filename", filename);
notNull("options", options);
int revision = options.getRevision();
int skip;
int sort;
if (revision >= 0) {
skip = revision;
sort = 1;
} else {
skip = (-revision) - 1;
sort = -1;
}
return createGridFSFindPublisher(filesCollection, clientSession, new Document("filename", filename), operationTimeout).skip(skip)
.sort(new Document("uploadDate", sort));
}
public static FindPublisher createFindPublisher(
final MongoCollection filesCollection,
@Nullable final ClientSession clientSession,
@Nullable final Bson filter,
@Nullable final Timeout operationTimeout) {
notNull("filesCollection", filesCollection);
FindPublisher publisher;
if (clientSession == null) {
publisher = collectionWithTimeout(filesCollection, operationTimeout).find();
} else {
publisher = collectionWithTimeout(filesCollection, operationTimeout).find(clientSession);
}
if (filter != null) {
publisher = publisher.filter(filter);
}
if (operationTimeout != null) {
publisher.timeoutMode(TimeoutMode.CURSOR_LIFETIME);
}
return publisher;
}
public static FindPublisher createFindPublisher(
final MongoCollection filesCollection,
@Nullable final ClientSession clientSession,
@Nullable final Bson filter) {
notNull("filesCollection", filesCollection);
FindPublisher publisher;
if (clientSession == null) {
publisher = filesCollection.find();
} else {
publisher = filesCollection.find(clientSession);
}
if (filter != null) {
publisher = publisher.filter(filter);
}
if (filesCollection.getTimeout(MILLISECONDS) != null) {
publisher.timeoutMode(TimeoutMode.CURSOR_LIFETIME);
}
return publisher;
}
public static Publisher createDeletePublisher(final MongoCollection filesCollection,
final MongoCollection chunksCollection,
@Nullable final ClientSession clientSession,
final BsonValue id) {
notNull("filesCollection", filesCollection);
notNull("chunksCollection", chunksCollection);
notNull("id", id);
BsonDocument filter = new BsonDocument("_id", id);
return Mono.defer(()-> {
Timeout operationTimeout = startTimeout(filesCollection.getTimeout(MILLISECONDS));
return collectionWithTimeoutMono(filesCollection, operationTimeout)
.flatMap(wrappedCollection -> {
if (clientSession == null) {
return Mono.from(wrappedCollection.deleteOne(filter));
} else {
return Mono.from(wrappedCollection.deleteOne(clientSession, filter));
}
}).flatMap(deleteResult -> {
if (deleteResult.wasAcknowledged() && deleteResult.getDeletedCount() == 0) {
return Mono.error(new MongoGridFSException(format("No file found with the ObjectId: %s", id)));
}
return collectionWithTimeoutMono(chunksCollection, operationTimeout);
}).flatMap(wrappedCollection -> {
if (clientSession == null) {
return Mono.from(wrappedCollection.deleteMany(new BsonDocument("files_id", id)));
} else {
return Mono.from(wrappedCollection.deleteMany(clientSession, new BsonDocument("files_id", id)));
}
}).then();
});
}
public static Publisher createRenamePublisher(final MongoCollection filesCollection,
@Nullable final ClientSession clientSession,
final BsonValue id,
final String newFilename) {
notNull("filesCollection", filesCollection);
notNull("id", id);
notNull("newFilename", newFilename);
BsonDocument filter = new BsonDocument("_id", id);
BsonDocument update = new BsonDocument("$set",
new BsonDocument("filename", new BsonString(newFilename)));
Publisher publisher;
if (clientSession == null) {
publisher = filesCollection.updateOne(filter, update);
} else {
publisher = filesCollection.updateOne(clientSession, filter, update);
}
return Mono.from(publisher).flatMap(updateResult -> {
if (updateResult.wasAcknowledged() && updateResult.getModifiedCount() == 0) {
throw new MongoGridFSException(format("No file found with the ObjectId: %s", id));
}
return Mono.empty();
});
}
public static Publisher createDropPublisher(final MongoCollection filesCollection,
final MongoCollection chunksCollection,
@Nullable final ClientSession clientSession) {
return Mono.defer(() -> {
Timeout operationTimeout = startTimeout(filesCollection.getTimeout(MILLISECONDS));
return collectionWithTimeoutMono(filesCollection, operationTimeout)
.flatMap(wrappedCollection -> {
if (clientSession == null) {
return Mono.from(wrappedCollection.drop());
} else {
return Mono.from(wrappedCollection.drop(clientSession));
}
}).then(collectionWithTimeoutDeferred(chunksCollection, operationTimeout))
.flatMap(wrappedCollection -> {
if (clientSession == null) {
return Mono.from(wrappedCollection.drop());
} else {
return Mono.from(wrappedCollection.drop(clientSession));
}
});
});
}
@Nullable
private static Timeout startTimeout(@Nullable final Long timeoutMs) {
return timeoutMs == null ? null : TimeoutContext.startTimeout(timeoutMs);
}
}
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