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MongoDB support for Spring Data
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/*
 * Copyright 2019-2023 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 org.springframework.data.mongodb.core.ReactiveMongoTemplate;
import org.springframework.lang.Nullable;
import org.springframework.transaction.support.ResourceHolderSupport;

import com.mongodb.reactivestreams.client.ClientSession;

/**
 * MongoDB specific resource holder, wrapping a {@link ClientSession}. {@link ReactiveMongoTransactionManager} binds
 * instances of this class to the subscriber context.
 * 

 * Note: Intended for internal usage only.
 *
 * @author Mark Paluch
 * @author Christoph Strobl
 * @since 2.2
 * @see ReactiveMongoTransactionManager
 * @see ReactiveMongoTemplate
 */
class ReactiveMongoResourceHolder extends ResourceHolderSupport {

	private @Nullable ClientSession session;
	private ReactiveMongoDatabaseFactory databaseFactory;

	/**
	 * Create a new {@link ReactiveMongoResourceHolder} for a given {@link ClientSession session}.
	 *
	 * @param session the associated {@link ClientSession}. Can be {@literal null}.
	 * @param databaseFactory the associated {@link MongoDatabaseFactory}. must not be {@literal null}.
	 */
	ReactiveMongoResourceHolder(@Nullable ClientSession session, ReactiveMongoDatabaseFactory databaseFactory) {

		this.session = session;
		this.databaseFactory = databaseFactory;
	}

	/**
	 * @return the associated {@link ClientSession}. Can be {@literal null}.
	 */
	@Nullable
	ClientSession getSession() {
		return session;
	}

	/**
	 * @return the required associated {@link ClientSession}.
	 * @throws IllegalStateException if no session is associated.
	 */
	ClientSession getRequiredSession() {

		ClientSession session = getSession();

		if (session == null) {
			throw new IllegalStateException("No ClientSession associated");
		}
		return session;
	}

	/**
	 * @return the associated {@link ReactiveMongoDatabaseFactory}.
	 */
	public ReactiveMongoDatabaseFactory getDatabaseFactory() {
		return databaseFactory;
	}

	/**
	 * Set the {@link ClientSession} to guard.
	 *
	 * @param session can be {@literal null}.
	 */
	public void setSession(@Nullable ClientSession session) {
		this.session = session;
	}

	/**
	 * @return {@literal true} if session is not {@literal null}.
	 */
	boolean hasSession() {
		return session != null;
	}

	/**
	 * If the {@link ReactiveMongoResourceHolder} is {@link #hasSession() not already associated} with a
	 * {@link ClientSession} the given value is {@link #setSession(ClientSession) set} and returned, otherwise the current
	 * bound session is returned.
	 *
	 * @param session
	 * @return
	 */
	@Nullable
	public ClientSession setSessionIfAbsent(@Nullable ClientSession session) {

		if (!hasSession()) {
			setSession(session);
		}

		return session;
	}

	/**
	 * @return {@literal true} if the session is active and has not been closed.
	 */
	boolean hasActiveSession() {

		if (!hasSession()) {
			return false;
		}

		return hasServerSession() && !getRequiredSession().getServerSession().isClosed();
	}

	/**
	 * @return {@literal true} if the session has an active transaction.
	 * @see #hasActiveSession()
	 */
	boolean hasActiveTransaction() {

		if (!hasActiveSession()) {
			return false;
		}

		return getRequiredSession().hasActiveTransaction();
	}

	/**
	 * @return {@literal true} if the {@link ClientSession} has a {@link com.mongodb.session.ServerSession} associated
	 *         that is accessible via {@link ClientSession#getServerSession()}.
	 */
	boolean hasServerSession() {

		try {
			return getRequiredSession().getServerSession() != null;
		} catch (IllegalStateException serverSessionClosed) {
			// ignore
		}

		return false;
	}
}