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<title>Lab 11 - Build a Product Search/Details Service using MySQL</title>
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</head>
<body class="article">
<div id="header">
<h1>Lab 11 - Build a Product Search/Details Service using MySQL</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="quoteblock abstract">
<blockquote>
<div class="paragraph">
<p>In this lab we’ll begin the first subproject of our complete cloud-native application architecture: <em>SpringBox</em>, which implements the movie browsing portion of a “Redbox-like” website.
This microservice will provide the <em>Movie Catalog Service</em>, which will allow us to browse movies by genre, browse an individual movie’s details, and search for movies.</p>
</div>
<div class="paragraph">
<p>We’ll be using the <a href="http://grouplens.org/datasets/movielens/">MovieLens</a> dataset, and we’ll model it’s <code>Movie</code> and <code>Genre</code> concepts in this microservice.</p>
</div>
</blockquote>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The completed code for this lab can be found at <code>$COURSE_HOME/day_01/session_04/lab_11/complete/springbox-catalog</code>.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_developing_the_service">Developing the Service</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Change to the lab directory:</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_01/session_04/lab_11/initial/springbox-catalog</pre>
</div>
</div>
<div class="paragraph">
<p>and import the project (via <code>pom.xml</code>) into your IDE of choice.</p>
</div>
</li>
<li>
<p>Start by adding a dependency on the <a href="http://hsqldb.org/">HyperSQL in-memory database</a> to <code>pom.xml</code>:</p>
<div class="listingblock">
<div class="content">
<pre><dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
</dependency></pre>
</div>
</div>
</li>
<li>
<p>Create the package <code>io.springbox.catalog.domain</code> and in that package create the class <code>Genre</code>. Into that file you can paste the following source code, which models the MovieLens <code>Genre</code> concept:</p>
<div class="listingblock">
<div class="content">
<pre>@Entity
@Table(name = "genres")
public class Genre {
@Id
@GeneratedValue
private Long id;
@Column(nullable = false)
private String mlId;
@Column(nullable = false)
private String name;
@ManyToMany(mappedBy = "genres")
@JsonIgnore
private List<Movie> movies;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getMlId() {
return mlId;
}
public void setMlId(String mlId) {
this.mlId = mlId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Movie> getMovies() {
return movies;
}
public void setMovies(List<Movie> movies) {
this.movies = movies;
}
}</pre>
</div>
</div>
<div class="paragraph">
<p>Notice that we’re using JPA annotations on the class and its fields. You’ll need to use your IDE’s features to add the appropriate import statements.
This class won’t compile just yet, and we’ll fix that in the next step.</p>
</div>
</li>
<li>
<p>Also in the <code>io.springbox.catalog.domain</code> package, create the class <code>Movie</code>. Into that file you can paste the following source code, which models the MovieLens <code>Movie</code> concept:</p>
<div class="listingblock">
<div class="content">
<pre>@Entity
@Table(name = "movies")
public class Movie {
@Id
@GeneratedValue
private Long id;
@Column(nullable = false)
private String title;
@Column(nullable = false)
private String mlId;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "movies_genres",
joinColumns = {@JoinColumn(name = "movie_id", referencedColumnName = "id")},
inverseJoinColumns = {@JoinColumn(name = "genre_id", referencedColumnName = "id")})
private List<Genre> genres;
@Column(nullable = false)
private int numberInStock;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public List<Genre> getGenres() {
return genres;
}
public void setGenres(List<Genre> genres) {
this.genres = genres;
}
public String getMlId() {
return mlId;
}
public void setMlId(String mlId) {
this.mlId = mlId;
}
}</pre>
</div>
</div>
<div class="paragraph">
<p>Once again, use the IDE to add the appropriate import statements.
At this point, both <code>Movie</code> and <code>Genre</code> should compile.</p>
</div>
</li>
<li>
<p>Create the package <code>io.springbox.catalog.repositories</code> and in that package create the interface <code>GenreRepository</code>. Paste the following code and add appropriate imports:</p>
<div class="listingblock">
<div class="content">
<pre>public interface GenreRepository extends CrudRepository<Genre, Long> {
Genre findByMlId(String mlId);
}</pre>
</div>
</div>
</li>
<li>
<p>Also in the <code>io.springbox.catalog.repositories</code> package, create the interface <code>MovieRepository</code>. Paste the following code and add appropriate imports:</p>
<div class="listingblock">
<div class="content">
<pre>public interface MovieRepository extends CrudRepository<Movie, Long> {
public Movie findByMlId(String mlId);
}</pre>
</div>
</div>
</li>
<li>
<p>Create the package <code>io.springbox.catalog.controllers</code> and in that package create the class <code>GenreController</code>. Paste the following code and add appropriate imports:</p>
<div class="listingblock">
<div class="content">
<pre>@RestController
public class GenreController {
@Autowired
GenreRepository genreRepository;
@RequestMapping(value = "/genres", method = RequestMethod.GET)
public Iterable<Genre> genres() {
return genreRepository.findAll();
}
@RequestMapping(value = "/genres/{mlId}", method = RequestMethod.GET)
public Genre genre(@PathVariable String mlId) {
return genreRepository.findByMlId(mlId);
}
}</pre>
</div>
</div>
</li>
<li>
<p>Also in the <code>io.springbox.catalog.controllers</code> package, create the class <code>MovieController</code>. Paste the following code and add appropriate imports:</p>
<div class="listingblock">
<div class="content">
<pre>@RestController
public class MovieController {
@Autowired
MovieRepository movieRepository;
@RequestMapping(value = "/movies", method = RequestMethod.GET)
public Iterable<Movie> movies() {
return movieRepository.findAll();
}
@RequestMapping(value = "/movies/{mlId}", method = RequestMethod.GET)
public Movie movie(@PathVariable String mlId) {
return movieRepository.findByMlId(mlId);
}
}</pre>
</div>
</div>
</li>
<li>
<p>Add the <code>@EnableJpaRepositories</code> annotation to <code>io.springbox.catalog.SpringboxCatalogApplication</code>:</p>
<div class="listingblock">
<div class="content">
<pre>@SpringBootApplication
@EnableJpaRepositories // <--- Add this!
public class SpringboxCatalogApplication {
public static void main(String[] args) {
SpringApplication.run(SpringboxCatalogApplication.class, args);
}
}</pre>
</div>
</div>
</li>
<li>
<p>Take a look at <code>src/main/resources/import.sql</code>, which has already been provided in your project.
It contains the MovieLens dataset imports that we’ll be using (excerpt here):</p>
<div class="listingblock">
<div class="content">
<pre>insert into genres (name,ml_id,id) values ('unknown',0,1000);
insert into genres (name,ml_id,id) values ('Action',1,1001);
insert into genres (name,ml_id,id) values ('Adventure',2,1002);
insert into genres (name,ml_id,id) values ('Animation',3,1003);
insert into genres (name,ml_id,id) values ('Children''s',4,1004);
insert into genres (name,ml_id,id) values ('Comedy',5,1005);
insert into genres (name,ml_id,id) values ('Crime',6,1006);
insert into genres (name,ml_id,id) values ('Documentary',7,1007);
insert into genres (name,ml_id,id) values ('Drama',8,1008);
insert into genres (name,ml_id,id) values ('Fantasy',9,1009);
insert into genres (name,ml_id,id) values ('Film-Noir',10,1010);
insert into genres (name,ml_id,id) values ('Horror',11,1011);
insert into genres (name,ml_id,id) values ('Musical',12,1012);
insert into genres (name,ml_id,id) values ('Mystery',13,1013);
insert into genres (name,ml_id,id) values ('Romance',14,1014);
insert into genres (name,ml_id,id) values ('Sci-Fi',15,1015);
insert into genres (name,ml_id,id) values ('Thriller',16,1016);
insert into genres (name,ml_id,id) values ('War',17,1017);
insert into genres (name,ml_id,id) values ('Western',18,1018);
insert into movies(id,title,ml_id,number_in_stock) values (1000,'Toy Story (1995)','1',10);
insert into movies_genres(movie_id, genre_id) values (1000,1003);
insert into movies_genres(movie_id, genre_id) values (1000,1004);
insert into movies_genres(movie_id, genre_id) values (1000,1005);
insert into movies(id,title,ml_id,number_in_stock) values (1001,'GoldenEye (1995)','2',10);
insert into movies_genres(movie_id, genre_id) values (1001,1001);
insert into movies_genres(movie_id, genre_id) values (1001,1002);
insert into movies_genres(movie_id, genre_id) values (1001,1016);
insert into movies(id,title,ml_id,number_in_stock) values (1002,'Four Rooms (1995)','3',10);
insert into movies_genres(movie_id, genre_id) values (1002,1016);
insert into movies(id,title,ml_id,number_in_stock) values (1003,'Get Shorty (1995)','4',10);
insert into movies_genres(movie_id, genre_id) values (1003,1001);
insert into movies_genres(movie_id, genre_id) values (1003,1005);
insert into movies_genres(movie_id, genre_id) values (1003,1008);</pre>
</div>
</div>
</li>
<li>
<p>Build the JAR:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>Run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/springbox-catalog-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Access the application using <code>curl</code> to make sure everything is working properly:</p>
<div class="listingblock">
<div class="content">
<pre>$ curl -i localhost:8080/movies/1
HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8Date: Mon, 16 Feb 2015 03:38:42 GMTServer: Apache-Coyote/1.1
Transfer-Encoding: chunked
X-Application-Context: application
{
"genres": [
{
"id": 1003,
"mlId": "3",
"name": "Animation"
},
{
"id": 1004,
"mlId": "4",
"name": "Children's"
},
{
"id": 1005,
"mlId": "5",
"name": "Comedy"
}
],
"id": 1000,
"mlId": "1",
"title": "Toy Story (1995)"
}</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_preparing_for_cloud_foundry">Preparing for Cloud Foundry</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>We want to bind to a MySQL data source when running on Cloud Foundry, so let’s create one:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf cs p-mysql 100mb-dev springbox-catalog-db
Creating service springbox-catalog-db in org oreilly-class / space instructor as [email protected]...
OK</pre>
</div>
</div>
</li>
<li>
<p>Add the appropriate dependencies for MySQL’s JDBC driver and the Spring Cloud Connectors:</p>
<div class="listingblock">
<div class="content">
<pre><dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<version>1.1.7</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-cloudfoundry-connector</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-spring-service-connector</artifactId>
</dependency></pre>
</div>
</div>
</li>
<li>
<p>Rename <code>src/main/resources/application.properties</code> file to <code>src/main/resources/application.yml</code> file.
YAML files make it much easier to represent multiple Spring profiles.
This will allow us to run locally with HSQLDB and on PWS with PostgreSQL.</p>
</li>
<li>
<p>Paste the following into <code>application.yml</code>:</p>
<div class="listingblock">
<div class="content">
<pre>spring:
jpa:
hibernate:
ddl-auto: create-drop
---
spring:
profiles: default
jpa:
database: HSQL
---
spring:
profiles: cloud
jpa:
database: MYSQL</pre>
</div>
</div>
</li>
<li>
<p>Rebuild the JAR:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_deploying_to_cloud_foundry">Deploying to Cloud Foundry</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Create an application manifest in <code>manifest.yml</code>:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-yml" data-lang="yml">---
applications:
- name: springbox-catalog
host: springbox-catalog-${random-word}
memory: 512M
instances: 1
path: target/springbox-catalog-0.0.1-SNAPSHOT.jar
env:
SPRING_PROFILES_ACTIVE: cloud
services:
- springbox-catalog-db</code></pre>
</div>
</div>
</li>
<li>
<p>Push to Cloud Foundry:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf push
...
Showing health and status for app springbox-catalog in org oreilly-class / space instructor as [email protected]...
OK
requested state: started
instances: 1/1
usage: 512M x 1 instances
urls: springbox-catalog-overwild-nonrevival.cfapps.io
last uploaded: Mon Feb 16 19:34:38 UTC 2015
state since cpu memory disk
#0 running 2015-02-16 11:36:05 AM 0.0% 401.5M of 512M 127.5M of 1G</pre>
</div>
</div>
</li>
<li>
<p>Access the application using <code>curl</code> at the random route provided by CF:</p>
<div class="listingblock">
<div class="content">
<pre>$ curl -i springbox-catalog-overwild-nonrevival.cfapps.io/movies/1
HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8Date: Mon, 16 Feb 2015 03:38:42 GMTServer: Apache-Coyote/1.1
Transfer-Encoding: chunked
X-Application-Context: application
{
"genres": [
{
"id": 1003,
"mlId": "3",
"name": "Animation"
},
{
"id": 1004,
"mlId": "4",
"name": "Children's"
},
{
"id": 1005,
"mlId": "5",
"name": "Comedy"
}
],
"id": 1000,
"mlId": "1",
"title": "Toy Story (1995)"
}</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2015-06-13 15:39:17 EDT
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