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MongoDB support for Spring Data
/*
* Copyright 2019-2024 the original author or authors.
*
* 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
*
* https://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 org.springframework.data.mongodb;
import reactor.core.publisher.Mono;
import reactor.util.context.Context;
import org.springframework.lang.Nullable;
import org.springframework.transaction.NoTransactionException;
import org.springframework.transaction.reactive.ReactiveResourceSynchronization;
import org.springframework.transaction.reactive.TransactionSynchronization;
import org.springframework.transaction.reactive.TransactionSynchronizationManager;
import org.springframework.transaction.support.ResourceHolderSynchronization;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import com.mongodb.ClientSessionOptions;
import com.mongodb.reactivestreams.client.ClientSession;
import com.mongodb.reactivestreams.client.MongoCollection;
import com.mongodb.reactivestreams.client.MongoDatabase;
/**
* Helper class for managing reactive {@link MongoDatabase} instances via {@link ReactiveMongoDatabaseFactory}. Used for
* obtaining {@link ClientSession session bound} resources, such as {@link MongoDatabase} and {@link MongoCollection}
* suitable for transactional usage.
*
* Note: Intended for internal usage only.
*
* @author Mark Paluch
* @author Christoph Strobl
* @author Mathieu Ouellet
* @since 2.2
*/
public class ReactiveMongoDatabaseUtils {
/**
* Check if the {@link ReactiveMongoDatabaseFactory} is actually bound to a
* {@link com.mongodb.reactivestreams.client.ClientSession} that has an active transaction, or if a
* {@link org.springframework.transaction.reactive.TransactionSynchronization} has been registered for the
* {@link ReactiveMongoDatabaseFactory resource} and if the associated
* {@link com.mongodb.reactivestreams.client.ClientSession} has an
* {@link com.mongodb.reactivestreams.client.ClientSession#hasActiveTransaction() active transaction}.
*
* @param databaseFactory the resource to check transactions for. Must not be {@literal null}.
* @return a {@link Mono} emitting {@literal true} if the factory has an ongoing transaction.
*/
public static Mono isTransactionActive(ReactiveMongoDatabaseFactory databaseFactory) {
if (databaseFactory.isTransactionActive()) {
return Mono.just(true);
}
return TransactionSynchronizationManager.forCurrentTransaction() //
.map(it -> {
ReactiveMongoResourceHolder holder = (ReactiveMongoResourceHolder) it.getResource(databaseFactory);
return holder != null && holder.hasActiveTransaction();
}) //
.onErrorResume(NoTransactionException.class, e -> Mono.just(false));
}
/**
* Obtain the default {@link MongoDatabase database} form the given {@link ReactiveMongoDatabaseFactory factory} using
* {@link SessionSynchronization#ON_ACTUAL_TRANSACTION native session synchronization}.
*
* Registers a {@link MongoSessionSynchronization MongoDB specific transaction synchronization} within the subscriber
* {@link Context} if {@link TransactionSynchronizationManager#isSynchronizationActive() synchronization is active}.
*
* @param factory the {@link ReactiveMongoDatabaseFactory} to get the {@link MongoDatabase} from.
* @return the {@link MongoDatabase} that is potentially associated with a transactional {@link ClientSession}.
*/
public static Mono getDatabase(ReactiveMongoDatabaseFactory factory) {
return doGetMongoDatabase(null, factory, SessionSynchronization.ON_ACTUAL_TRANSACTION);
}
/**
* Obtain the default {@link MongoDatabase database} form the given {@link ReactiveMongoDatabaseFactory factory}.
*
* Registers a {@link MongoSessionSynchronization MongoDB specific transaction synchronization} within the subscriber
* {@link Context} if {@link TransactionSynchronizationManager#isSynchronizationActive() synchronization is active}.
*
* @param factory the {@link ReactiveMongoDatabaseFactory} to get the {@link MongoDatabase} from.
* @param sessionSynchronization the synchronization to use. Must not be {@literal null}.
* @return the {@link MongoDatabase} that is potentially associated with a transactional {@link ClientSession}.
*/
public static Mono getDatabase(ReactiveMongoDatabaseFactory factory,
SessionSynchronization sessionSynchronization) {
return doGetMongoDatabase(null, factory, sessionSynchronization);
}
/**
* Obtain the {@link MongoDatabase database} with given name form the given {@link ReactiveMongoDatabaseFactory
* factory} using {@link SessionSynchronization#ON_ACTUAL_TRANSACTION native session synchronization}.
*
* Registers a {@link MongoSessionSynchronization MongoDB specific transaction synchronization} within the subscriber
* {@link Context} if {@link TransactionSynchronizationManager#isSynchronizationActive() synchronization is active}.
*
* @param dbName the name of the {@link MongoDatabase} to get.
* @param factory the {@link ReactiveMongoDatabaseFactory} to get the {@link MongoDatabase} from.
* @return the {@link MongoDatabase} that is potentially associated with a transactional {@link ClientSession}.
*/
public static Mono getDatabase(String dbName, ReactiveMongoDatabaseFactory factory) {
return doGetMongoDatabase(dbName, factory, SessionSynchronization.ON_ACTUAL_TRANSACTION);
}
/**
* Obtain the {@link MongoDatabase database} with given name form the given {@link ReactiveMongoDatabaseFactory
* factory}.
*
* Registers a {@link MongoSessionSynchronization MongoDB specific transaction synchronization} within the subscriber
* {@link Context} if {@link TransactionSynchronizationManager#isSynchronizationActive() synchronization is active}.
*
* @param dbName the name of the {@link MongoDatabase} to get.
* @param factory the {@link ReactiveMongoDatabaseFactory} to get the {@link MongoDatabase} from.
* @param sessionSynchronization the synchronization to use. Must not be {@literal null}.
* @return the {@link MongoDatabase} that is potentially associated with a transactional {@link ClientSession}.
*/
public static Mono getDatabase(String dbName, ReactiveMongoDatabaseFactory factory,
SessionSynchronization sessionSynchronization) {
return doGetMongoDatabase(dbName, factory, sessionSynchronization);
}
private static Mono doGetMongoDatabase(@Nullable String dbName, ReactiveMongoDatabaseFactory factory,
SessionSynchronization sessionSynchronization) {
Assert.notNull(factory, "DatabaseFactory must not be null");
if (sessionSynchronization == SessionSynchronization.NEVER) {
return getMongoDatabaseOrDefault(dbName, factory);
}
return TransactionSynchronizationManager.forCurrentTransaction()
.filter(TransactionSynchronizationManager::isSynchronizationActive) //
.flatMap(synchronizationManager -> {
return doGetSession(synchronizationManager, factory, sessionSynchronization) //
.flatMap(it -> getMongoDatabaseOrDefault(dbName, factory.withSession(it)));
}) //
.onErrorResume(NoTransactionException.class, e -> getMongoDatabaseOrDefault(dbName, factory))
.switchIfEmpty(getMongoDatabaseOrDefault(dbName, factory));
}
private static Mono getMongoDatabaseOrDefault(@Nullable String dbName,
ReactiveMongoDatabaseFactory factory) {
return StringUtils.hasText(dbName) ? factory.getMongoDatabase(dbName) : factory.getMongoDatabase();
}
private static Mono doGetSession(TransactionSynchronizationManager synchronizationManager,
ReactiveMongoDatabaseFactory dbFactory, SessionSynchronization sessionSynchronization) {
final ReactiveMongoResourceHolder registeredHolder = (ReactiveMongoResourceHolder) synchronizationManager
.getResource(dbFactory);
// check for native MongoDB transaction
if (registeredHolder != null
&& (registeredHolder.hasSession() || registeredHolder.isSynchronizedWithTransaction())) {
return registeredHolder.hasSession() ? Mono.just(registeredHolder.getSession())
: createClientSession(dbFactory).map(registeredHolder::setSessionIfAbsent);
}
if (SessionSynchronization.ON_ACTUAL_TRANSACTION.equals(sessionSynchronization)) {
return Mono.empty();
}
// init a non native MongoDB transaction by registering a MongoSessionSynchronization
return createClientSession(dbFactory).map(session -> {
ReactiveMongoResourceHolder newHolder = new ReactiveMongoResourceHolder(session, dbFactory);
newHolder.getRequiredSession().startTransaction();
synchronizationManager
.registerSynchronization(new MongoSessionSynchronization(synchronizationManager, newHolder, dbFactory));
newHolder.setSynchronizedWithTransaction(true);
synchronizationManager.bindResource(dbFactory, newHolder);
return newHolder.getSession();
});
}
private static Mono createClientSession(ReactiveMongoDatabaseFactory dbFactory) {
return dbFactory.getSession(ClientSessionOptions.builder().causallyConsistent(true).build());
}
/**
* MongoDB specific {@link ResourceHolderSynchronization} for resource cleanup at the end of a transaction when
* participating in a non-native MongoDB transaction, such as a R2CBC transaction.
*
* @author Mark Paluch
* @since 2.2
*/
private static class MongoSessionSynchronization
extends ReactiveResourceSynchronization {
private final ReactiveMongoResourceHolder resourceHolder;
MongoSessionSynchronization(TransactionSynchronizationManager synchronizationManager,
ReactiveMongoResourceHolder resourceHolder, ReactiveMongoDatabaseFactory dbFactory) {
super(resourceHolder, dbFactory, synchronizationManager);
this.resourceHolder = resourceHolder;
}
@Override
protected boolean shouldReleaseBeforeCompletion() {
return false;
}
@Override
protected Mono processResourceAfterCommit(ReactiveMongoResourceHolder resourceHolder) {
if (isTransactionActive(resourceHolder)) {
return Mono.from(resourceHolder.getRequiredSession().commitTransaction());
}
return Mono.empty();
}
@Override
public Mono afterCompletion(int status) {
return Mono.defer(() -> {
if (status == TransactionSynchronization.STATUS_ROLLED_BACK && isTransactionActive(this.resourceHolder)) {
return Mono.from(resourceHolder.getRequiredSession().abortTransaction()) //
.then(super.afterCompletion(status));
}
return super.afterCompletion(status);
});
}
@Override
protected Mono releaseResource(ReactiveMongoResourceHolder resourceHolder, Object resourceKey) {
return Mono.fromRunnable(() -> {
if (resourceHolder.hasActiveSession()) {
resourceHolder.getRequiredSession().close();
}
});
}
private boolean isTransactionActive(ReactiveMongoResourceHolder resourceHolder) {
if (!resourceHolder.hasSession()) {
return false;
}
return resourceHolder.getRequiredSession().hasActiveTransaction();
}
}
}