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MongoNamespaceOps.java
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MongoNamespaceOps.java
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/*
* Copyright (c) 2017-2018 Bosch Software Innovations GmbH.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/org/documents/epl-2.0/index.php
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.services.utils.persistence.mongo.namespace;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import org.bson.Document;
import com.mongodb.client.model.BulkWriteOptions;
import com.mongodb.client.model.DeleteManyModel;
import com.mongodb.client.model.WriteModel;
import com.mongodb.reactivestreams.client.MongoCollection;
import com.mongodb.reactivestreams.client.MongoDatabase;
import akka.NotUsed;
import akka.japi.pf.Match;
import akka.stream.javadsl.Source;
/**
* MongoDB operations on the level of namespaces.
*/
public final class MongoNamespaceOps implements NamespaceOps<MongoNamespaceSelection> {
private final MongoDatabase db;
private MongoNamespaceOps(final MongoDatabase db) {
this.db = db;
}
/**
* Create a new NamespaceOps object.
*
* @param db the database to operate on.
* @return a new NamespaceOps object.
*/
public static MongoNamespaceOps of(final MongoDatabase db) {
return new MongoNamespaceOps(db);
}
@Override
public Source<Optional<Throwable>, NotUsed> purge(final MongoNamespaceSelection selection) {
final MongoCollection<Document> collection = db.getCollection(selection.getCollectionName());
if (selection.isEntireCollection()) {
return Source.fromPublisher(collection.drop())
.map(success -> Optional.empty());
} else {
// https://stackoverflow.com/a/33164008
// claims unordered bulk ops halve MongoDB load
final List<WriteModel<Document>> writeModel =
Collections.singletonList(new DeleteManyModel<>(selection.getFilter()));
final BulkWriteOptions options = new BulkWriteOptions().ordered(false);
return Source.fromPublisher(collection.bulkWrite(writeModel, options))
.map(result -> Optional.<Throwable>empty())
.recover(Match.<Throwable, Optional<Throwable>>matchAny(Optional::of).build());
}
}
}