gaspersic/java-design-patterns
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fix #216 Repository vs DAO

Browse Source
This commit is contained in:
hoswey 2015-11-27 11:22:33 +08:00
parent 092d48d150
commit 9d4fff6029
12 changed files with 343 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
pom.xml
View File

@ -11,6 +11,7 @@
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<hibernate.version>5.0.1.Final</hibernate.version>
<spring.version>4.1.7.RELEASE</spring.version>
<spring-data.version>1.9.0.RELEASE</spring-data.version>
<h2.version>1.4.188</h2.version>
<junit.version>4.12</junit.version>
@ -20,6 +21,7 @@
<commons-dbcp.version>1.4</commons-dbcp.version>
<camel.version>2.15.3</camel.version>
<log4j.version>1.2.17</log4j.version>
<guava.version>18.0</guava.version>
</properties>
<modules>
<module>abstract-factory</module>
@ -101,6 +103,11 @@
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring-data.version}</version>
@ -142,6 +149,11 @@
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
</dependencies>
</dependencyManagement>

BIN
repository/etc/repository.png
View File

Binary file not shown.
Side by Side Swipe Overlay

Before

Width:  |  Height:  |  Size: 9.5 KiB

After

Width:  |  Height:  |  Size: 54 KiB

40
repository/etc/repository.ucls
View File

@ -19,10 +19,48 @@
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</interface>
<dependency id="3">
<class id="3" language="java" name="com.iluwatar.repository.PersonSpecifications.AgeBetweenSpec" project="repository"
file="/repository/src/main/java/com/iluwatar/repository/PersonSpecifications.java" binary="false"
corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="412" y="246"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<class id="4" language="java" name="com.iluwatar.repository.PersonSpecifications" project="repository"
file="/repository/src/main/java/com/iluwatar/repository/PersonSpecifications.java" binary="false"
corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="627" y="68"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<class id="5" language="java" name="com.iluwatar.repository.PersonSpecifications.NameEqualSpec" project="repository"
file="/repository/src/main/java/com/iluwatar/repository/PersonSpecifications.java" binary="false"
corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="834" y="238"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<nesting id="6">
<end type="SOURCE" refId="4"/>
<end type="TARGET" refId="3"/>
</nesting>
<dependency id="7">
<end type="SOURCE" refId="2"/>
<end type="TARGET" refId="1"/>
</dependency>
<nesting id="8">
<end type="SOURCE" refId="4"/>
<end type="TARGET" refId="5"/>
</nesting>
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>

6
repository/index.md
View File

@ -25,3 +25,9 @@ querying is utilized.
**Real world examples:**
* [Spring Data](http://projects.spring.io/spring-data/)
**Credits:**
* [Don’t use DAO, use Repository](http://thinkinginobjects.com/2012/08/26/dont-use-dao-use-repository/)
* [Advanced Spring Data JPA - Specifications and Querydsl](https://spring.io/blog/2011/04/26/advanced-spring-data-jpa-specifications-and-querydsl/)

73
repository/pom.xml
View File

@ -1,35 +1,42 @@
<?xml version="1.0"?>
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.iluwatar</groupId>
<artifactId>java-design-patterns</artifactId>
<version>1.8.0-SNAPSHOT</version>
</parent>
<artifactId>repository</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.iluwatar</groupId>
<artifactId>java-design-patterns</artifactId>
<version>1.8.0-SNAPSHOT</version>
</parent>
<artifactId>repository</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</dependency>
</dependencies>
</project>

34
repository/src/main/java/com/iluwatar/repository/App.java
View File

@ -5,7 +5,6 @@ import java.util.List;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
*
* Repository pattern mediates between the domain and data mapping layers using a collection-like
* interface for accessing domain objects. A system with complex domain model often benefits from a
* layer that isolates domain objects from the details of the database access code and in such
@ -16,9 +15,9 @@ import org.springframework.context.support.ClassPathXmlApplicationContext;
* <p>
* In this example we utilize Spring Data to automatically generate a repository for us from the
* {@link Person} domain object. Using the {@link PersonRepository} we perform CRUD operations on
* the entity. Underneath we have configured in-memory H2 database for which schema is created and
* dropped on each run.
*
* the entity, moreover, the query by {@link org.springframework.data.jpa.domain.Specification} are
* also performed. Underneath we have configured in-memory H2 database for which schema is created
* and dropped on each run.
*/
public class App {
@ -28,16 +27,21 @@ public class App {
* @param args command line args
*/
public static void main(String[] args) {
ClassPathXmlApplicationContext context =
new ClassPathXmlApplicationContext("applicationContext.xml");
PersonRepository repository = context.getBean(PersonRepository.class);
Person peter = new Person("Peter", "Sagan");
Person nasta = new Person("Nasta", "Kuzminova");
Person peter = new Person("Peter", "Sagan", 17);
Person nasta = new Person("Nasta", "Kuzminova", 25);
Person john = new Person("John", "lawrence", 35);
Person terry = new Person("Terry", "Law", 36);
// Add new Person records
repository.save(peter);
repository.save(nasta);
repository.save(john);
repository.save(terry);
// Count Person records
System.out.println("Count Person records: " + repository.count());
@ -48,9 +52,6 @@ public class App {
System.out.println(person);
}
// Find Person by surname
System.out.println("Find by surname 'Sagan': " + repository.findBySurname("Sagan"));
// Update Person
nasta.setName("Barbora");
nasta.setSurname("Spotakova");
@ -61,9 +62,22 @@ public class App {
// Remove record from Person
repository.delete(2L);
// And finally count records
// count records
System.out.println("Count Person records: " + repository.count());
// find by name
Person p = repository.findOne(new PersonSpecifications.NameEqualSpec("John"));
System.out.println("Find by John is " + p);
// find by age
persons = repository.findAll(new PersonSpecifications.AgeBetweenSpec(20, 40));
System.out.println("Find Person with age between 20,40: ");
for (Person person : persons) {
System.out.println(person);
}
context.close();
}
}

58
repository/src/main/java/com/iluwatar/repository/Person.java
View File

@ -18,11 +18,14 @@ public class Person {
private String name;
private String surname;
private int age;
public Person() {}
public Person(String name, String surname) {
public Person(String name, String surname, int age) {
this.name = name;
this.surname = surname;
this.age = age;
}
public Long getId() {
@ -49,8 +52,59 @@ public class Person {
this.surname = surname;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", surname=" + surname + "]";
return "Person [id=" + id + ", name=" + name + ", surname=" + surname + ", age=" + age + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((id == null) ? 0 : id.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((surname == null) ? 0 : surname.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
if (age != other.age)
return false;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (surname == null) {
if (other.surname != null)
return false;
} else if (!surname.equals(other.surname))
return false;
return true;
}
}

8
repository/src/main/java/com/iluwatar/repository/PersonRepository.java
View File

@ -1,7 +1,6 @@
package com.iluwatar.repository;
import java.util.List;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
@ -11,7 +10,8 @@ import org.springframework.stereotype.Repository;
*
*/
@Repository
public interface PersonRepository extends CrudRepository<Person, Long> {
public interface PersonRepository
extends CrudRepository<Person, Long>, JpaSpecificationExecutor<Person> {
public List<Person> findBySurname(String surname);
public Person findByName(String name);
}

50
repository/src/main/java/com/iluwatar/repository/PersonSpecifications.java Normal file
View File

@ -0,0 +1,50 @@
package com.iluwatar.repository;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import org.springframework.data.jpa.domain.Specification;
/**
* Helper class, includes vary Specification as the abstraction of sql query criteria
*/
public class PersonSpecifications {
public static class AgeBetweenSpec implements Specification<Person> {
private int from;
private int to;
public AgeBetweenSpec(int from, int to) {
this.from = from;
this.to = to;
}
@Override
public Predicate toPredicate(Root<Person> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
return cb.between(root.get("age"), from, to);
}
}
public static class NameEqualSpec implements Specification<Person> {
public String name;
public NameEqualSpec(String name) {
this.name = name;
}
public Predicate toPredicate(Root<Person> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
return cb.equal(root.get("name"), this.name);
}
}
}

6
repository/src/main/resources/applicationContext.xml
View File

@ -6,10 +6,10 @@
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd">
<jpa:repositories base-package="com.iluwatar" />
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
<jpa:repositories base-package="com.iluwatar" base-class="org.springframework.data.jpa.repository.support.SimpleJpaRepository" />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

19
repository/src/test/java/com/iluwatar/repository/AppTest.java
View File

@ -1,19 +0,0 @@
package com.iluwatar.repository;
import org.junit.Test;
import com.iluwatar.repository.App;
/**
*
* Application test
*
*/
public class AppTest {
@Test
public void test() {
String[] args = {};
App.main(args);
}
}

109
repository/src/test/java/com/iluwatar/repository/RepositoryTest.java Normal file
View File

@ -0,0 +1,109 @@
package com.iluwatar.repository;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.List;
import javax.annotation.Resource;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.google.common.collect.Lists;
/**
* Test case to test the functions of {@link PersonRepository}, beside the CRUD functions, the query
* by {@link org.springframework.data.jpa.domain.Specification} are also test.
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:applicationContext.xml"})
public class RepositoryTest {
@Resource
private PersonRepository repository;
Person peter = new Person("Peter", "Sagan", 17);
Person nasta = new Person("Nasta", "Kuzminova", 25);
Person john = new Person("John", "lawrence", 35);
Person terry = new Person("Terry", "Law", 36);
List<Person> persons = Arrays.asList(peter, nasta, john, terry);
/**
* Prepare data for test
*/
@Before
public void setup() {
repository.save(persons);
}
@Test
public void testFindAll() {
List<Person> actuals = Lists.newArrayList(repository.findAll());
assertTrue(actuals.containsAll(persons) && persons.containsAll(actuals));
}
@Test
public void testSave() {
Person terry = repository.findByName("Terry");
terry.setSurname("Lee");
terry.setAge(47);
repository.save(terry);
terry = repository.findByName("Terry");
assertEquals(terry.getSurname(), "Lee");
assertEquals(47, terry.getAge());
}
@Test
public void testDelete() {
Person terry = repository.findByName("Terry");
repository.delete(terry);
assertEquals(3, repository.count());
assertNull(repository.findByName("Terry"));
}
@Test
public void testCount() {
assertEquals(4, repository.count());
}
@Test
public void testFindAllByAgeBetweenSpec() {
List<Person> persons = repository.findAll(new PersonSpecifications.AgeBetweenSpec(20, 40));
assertEquals(3, persons.size());
assertTrue(persons.stream().allMatch((item) -> {
return item.getAge() > 20 && item.getAge() < 40;
}));
}
@Test
public void testFindOneByNameEqualSpec() {
Person actual = repository.findOne(new PersonSpecifications.NameEqualSpec("Terry"));
assertEquals(terry, actual);
}
@After
public void cleanup() {
repository.deleteAll();
}
}