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Add Couchbase Transactions Example.
Closes #650. Original pull request: #663
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‎couchbase/pom.xml

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<modules>
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<module>example</module>
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<module>reactive</module>
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<module>transactions</module>
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<module>util</module>
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</modules>
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‎couchbase/transactions/README.md

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# Getting Started
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### Running the Sample
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* `$> docker run -d --name db -p 8091-8097:8091-8097 -p 11210:11210 -p 11207:11207 -p 18091-18095:18091-18095 -p 18096:18096 -p 18097:18097 couchbase`
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* Create new _cluster_ via `http://localhost:8091/`
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* Create new [bucket](http://localhost:8091/ui/index.html#/buckets) named _travel-sample_.
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*
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### Reference Documentation
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For further reference, please consider the following sections:
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* [Official Apache Maven documentation](https://maven.apache.org/guides/index.html)
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* [Spring Boot Maven Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/2.5.2/maven-plugin/reference/html/)
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* [Create an OCI image](https://docs.spring.io/spring-boot/docs/2.5.2/maven-plugin/reference/html/#build-image)
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* [Spring Data Couchbase](https://docs.spring.io/spring-boot/docs/2.5.2/reference/htmlsingle/#boot-features-couchbase)
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‎couchbase/transactions/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-data-couchbase-transactions</artifactId>
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<name>Spring Data Couchbase - Transaction example</name>
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<description>Transactions Demo project for Spring Data Couchbase</description>
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<parent>
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<groupId>org.springframework.data.examples</groupId>
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<artifactId>spring-data-couchbase-examples</artifactId>
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<version>2.0.0.BUILD-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-couchbase</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>${project.groupId}</groupId>
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<artifactId>spring-data-couchbase-example-utils</artifactId>
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<version>${project.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.data.examples</groupId>
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<artifactId>spring-data-couchbase-example-utils</artifactId>
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<version>2.0.0.BUILD-SNAPSHOT</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>spring-libs-snapshot</id>
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<url>https://repo.spring.io/libs-snapshot</url>
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</repository>
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<repository>
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<id>sonatype-snapshot</id>
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<url>https://oss.sonatype.org/content/repositories/snapshots</url>
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<snapshots>
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<enabled>true</enabled>
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</snapshots>
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<releases>
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<enabled>false</enabled>
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</releases>
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</repository>
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</repositories>
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<pluginRepositories>
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<pluginRepository>
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<id>spring-snapshots</id>
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<url>https://repo.spring.io/snapshot</url>
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</pluginRepository>
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<pluginRepository>
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<id>spring-milestones</id>
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<url>https://repo.spring.io/milestone</url>
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</pluginRepository>
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</pluginRepositories>
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</project>

‎couchbase/transactions/src/main/java/com/example/demo/AirlineGates.java

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/*
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* Copyright 2012-2022 the original author or authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.demo;
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import org.springframework.data.annotation.Id;
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import org.springframework.data.annotation.PersistenceConstructor;
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import org.springframework.data.annotation.Version;
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import org.springframework.data.couchbase.core.index.QueryIndexed;
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import org.springframework.data.couchbase.core.mapping.Document;
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/**
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* @author Michael Reiche
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*/
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@Document
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public class AirlineGates {
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@Id String id;
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@Version Long version;
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@QueryIndexed String name;
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String iata;
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Long gates;
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@PersistenceConstructor
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public AirlineGates(String id, String name, String iata, Long gates) {
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this.id = id;
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this.name = name;
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this.iata = iata;
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this.gates = gates;
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}
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public String getId() {
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return id;
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}
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public Long getGates() {
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return gates;
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}
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public String toString(){
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StringBuffer sb=new StringBuffer();
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sb.append("{");
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sb.append("\"id\":"+id);
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sb.append(", \"name\":"+name);
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sb.append(", \"iata\":"+iata);
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sb.append(", \"gates\":"+gates);
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sb.append("}");
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return sb.toString();
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}
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}

‎couchbase/transactions/src/main/java/com/example/demo/AirlineGatesRepository.java

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/*
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* Copyright 2017-2022 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.demo;
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import org.springframework.data.couchbase.repository.CouchbaseRepository;
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import org.springframework.data.couchbase.repository.DynamicProxyable;
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import org.springframework.stereotype.Repository;
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/**
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* @author Michael Reiche
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*/
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@Repository
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public interface AirlineGatesRepository
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extends CouchbaseRepository<AirlineGates, String>, DynamicProxyable<AirlineGatesRepository> {
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}

‎couchbase/transactions/src/main/java/com/example/demo/AirlineGatesService.java

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/*
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* Copyright 2022 the original author or authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.demo;
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import reactor.core.publisher.Mono;
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import org.springframework.data.couchbase.core.CouchbaseTemplate;
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import org.springframework.data.couchbase.core.ReactiveCouchbaseTemplate;
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import org.springframework.data.couchbase.core.TransactionalSupport;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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/**
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* @author Michael Reiche
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*/
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@Service
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public class AirlineGatesService {
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CouchbaseTemplate template;
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ReactiveCouchbaseTemplate reactiveTemplate;
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AirlineGatesRepository airlineGatesRepository;
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public AirlineGatesService(CouchbaseTemplate template, AirlineGatesRepository airlineGatesRepository) {
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this.template = template;
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this.reactiveTemplate = template.reactive();
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this.airlineGatesRepository = airlineGatesRepository;
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}
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@Transactional
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public void transferGates(String fromId, String toId, int gatesToTransfer, RuntimeException exceptionToThrow) {
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AirlineGates fromAirlineGates = template.findById(AirlineGates.class).one(fromId);
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AirlineGates toAirlineGates = template.findById(AirlineGates.class).one(toId);
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toAirlineGates.gates += gatesToTransfer;
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fromAirlineGates.gates -= gatesToTransfer;
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template.save(fromAirlineGates);
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if (exceptionToThrow != null) {
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throw exceptionToThrow;
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}
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template.save(toAirlineGates);
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}
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@Transactional
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public void transferGatesRepo(String fromId, String toId, int gatesToTransfer, RuntimeException exceptionToThrow) {
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AirlineGates fromAirlineGates = airlineGatesRepository.findById(fromId).orElse(null);
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AirlineGates toAirlineGates = airlineGatesRepository.findById(toId).orElse(null);
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toAirlineGates.gates += gatesToTransfer;
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fromAirlineGates.gates -= gatesToTransfer;
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airlineGatesRepository.save(fromAirlineGates);
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if (exceptionToThrow != null) {
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throw exceptionToThrow;
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}
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airlineGatesRepository.save(toAirlineGates);
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}
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// The @Transactional annotation results in the method of the proxy for the service executing this in a transaction
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@Transactional
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public Mono<Void> transferGatesReactive(String fromId, String toId, int gatesToTransfer,
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RuntimeException exceptionToThrow) {
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return Mono.deferContextual(ctx -> {
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AirlineGates fromAirlineGates = template.findById(AirlineGates.class).one(fromId);
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AirlineGates toAirlineGates = template.findById(AirlineGates.class).one(toId);
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toAirlineGates.gates += gatesToTransfer;
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fromAirlineGates.gates -= gatesToTransfer;
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template.save(fromAirlineGates);
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if (exceptionToThrow != null) {
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throw exceptionToThrow;
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}
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return reactiveTemplate.save(toAirlineGates).then();
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});
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}
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// This does not have the @Transactional annotation therefore is not executed in a transaction
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public AirlineGates save(AirlineGates airlineGates) {
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return template.save(airlineGates);
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}
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// This does not have the @Transactional annotation therefore is not executed in a transaction
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public AirlineGates findById(String id) {
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return template.findById(AirlineGates.class).one(id);
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}
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// This does not have the @Transactional annotation therefore is not executed in a transaction
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public AirlineGates saveRepo(AirlineGates airlineGates) {
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return airlineGatesRepository.save(airlineGates);
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}
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// This does not have the @Transactional annotation therefore is not executed in a transaction
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public AirlineGates findByIdRepo(String id) {
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return airlineGatesRepository.findById(id).orElse(null);
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}
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}

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