This is the key module of our scenario.

Here, we will organize the invocations to the microservices football-player-microservice-lra and football-player-offer-microservice-lra microservices as is required to implement our business logic.

We will analyze the two key points of this microservice, in detail:

• The Maven pom.xml, with the right dependencies
• The RESTful endpoint to understand the logic of the LRA specifications

Let's start with pom.xml, as follows:

<?xml   version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0   http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.packtpub.thorntail</groupId>
    <artifactId>football-player-market-microservice-lra</artifactId>
    <name>Thorntail Football player market microservice LRA</name>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
            <version.thorntail>2.1.0.Final</version.thorntail>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <failOnMissingWebXml>false</failOnMissingWebXml>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <version.resteasy>3.0.19.Final</version.resteasy>
            <lra.http.host>localhost</lra.http.host>
            <lra.http.port>8580</lra.http.port>
    </properties>

    <dependencyManagement>
            <dependencies>
            <dependency>
                  <groupId>io.thorntail</groupId>
                  <artifactId>bom</artifactId>
                  <version>${version.thorntail}</version>
                  <scope>import</scope>
                  <type>pom</type>
            </dependency>
            </dependencies>
    </dependencyManagement>

    <build>
            <finalName>football-player-market-microservice-lra</finalName>
            <plugins>
            <plugin>
                  <groupId>io.thorntail</groupId>
                  <artifactId>thorntail-maven-plugin</artifactId>
                  <version>${version.thorntail}</version>

                  <executions>
                        <execution>
                        <goals>
                              <goal>package</goal>
                        </goals>
                        </execution>
                  </executions>
                  <configuration>
                        <properties>
                        <lra.http.host>${lra.http.host}</lra.http.host>
                        <lra.http.port>${lra.http.port}</lra.http.port>
                        <swarm.port.offset>400</swarm.port.offset>
                        </properties>
                  </configuration>
            </plugin>
            </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>io.thorntail</groupId>
            <artifactId>microprofile</artifactId>
        </dependency>
        <dependency>
            <groupId>io.thorntail</groupId>
            <artifactId>transactions</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- LRA JAXRS filters -->
        <dependency>
            <groupId>org.jboss.narayana.rts</groupId>
            <artifactId>lra-filters</artifactId>
            <version>5.9.0.Final</version>
        </dependency>
        <dependency>
            <groupId>io.thorntail</groupId>
            <artifactId>jaxrs</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>io.thorntail</groupId>
            <artifactId>cdi</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-client</artifactId>
            <version>${version.resteasy}</version>
            <scope>provided</scope>
        </dependency>
        <!-- CORS Support For JAX-RS 2.0 / JavaEE 7  -->
        <dependency>
            <groupId>com.airhacks</groupId>
            <artifactId>jaxrs-cors</artifactId>
            <version>0.0.2</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
   </project>

The key points are as follows:

• The minimum Thorntail version that's required is 2.1.0
•  lra.http.port and lra.http.host are needed to connect to the LRA coordinator
• The dependencies are needed to perform RESTful invocations and to handle the LRA

Now, we will analyze the RESTful endpoint.

We will categorize a four-part class to analyze the key elements of the implementation, given as follows:

• Initialize
• A business method that represents our LRA
• The complete phase
• The compensate phase