Implement caching

Author: rashidi

data-jpa-hibernate-cache/build.gradle.kts

@@ -18,6 +18,8 @@ repositories {
 }
 
 dependencies {
+	implementation("org.ehcache:ehcache::jakarta")
+	implementation("org.hibernate.orm:hibernate-jcache")
 	implementation("org.springframework.boot:spring-boot-starter-data-jpa")
 	runtimeOnly("org.postgresql:postgresql")
 	testImplementation("org.springframework.boot:spring-boot-starter-test")

data-jpa-hibernate-cache/src/main/java/zin/rashidi/datajpa/hibernatecache/customer/Customer.java

@@ -3,11 +3,15 @@
 import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
+import org.hibernate.annotations.Cache;
+
+import static org.hibernate.annotations.CacheConcurrencyStrategy.READ_WRITE;
 
 /**
  * @author Rashidi Zin
  */
 @Entity
+@Cache(usage = READ_WRITE, region = "customer")
 class Customer {
 
     @Id

data-jpa-hibernate-cache/src/main/resources/application.properties

@@ -1 +1,5 @@
 spring.application.name=data-jpa-hibernate-cache
+spring.jpa.properties.hibernate.cache.region.factory_class=jcache
+spring.jpa.properties.hibernate.javax.cache.uri=/ehcache.xml
+spring.jpa.properties.hibernate.javax.cache.provider=org.ehcache.jsr107.EhcacheCachingProvider
+spring.jpa.properties.hibernate.cache.use_second_level_cache=true

data-jpa-hibernate-cache/src/main/resources/ehcache.xml

@@ -0,0 +1,7 @@
+<config xmlns='http://www.ehcache.org/v3'>
+    <cache alias="customer">
+        <resources>
+            <offheap unit="MB">10</offheap>
+        </resources>
+    </cache>
+</config>

data-jpa-hibernate-cache/src/test/java/zin/rashidi/datajpa/hibernatecache/customer/CustomerRepositoryTests.java

@@ -1,10 +1,16 @@
 package zin.rashidi.datajpa.hibernatecache.customer;
 
+import jakarta.persistence.EntityManagerFactory;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.context.annotation.Import;
+import org.springframework.test.context.jdbc.Sql;
 import zin.rashidi.datajpa.hibernatecache.TestcontainersConfiguration;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 /**
  * @author Rashidi Zin
  */
@@ -15,4 +21,15 @@ class CustomerRepositoryTests {
     @Autowired
     private CustomerRepository customers;
 
+    @Autowired
+    private EntityManagerFactory entityManagerFactory;
+
+    @Test
+    @DisplayName("Given Customer is configured for caching When I make first retrieval Then its cache is available")
+    @Sql(statements = "INSERT INTO customer (id, name) VALUES (1, 'Rashidi Zin')")
+    void findById() {
+        customers.findById(1L).orElseThrow();
+
+        assertThat(entityManagerFactory.getCache().contains(Customer.class, 1L)).isTrue();
+    }
 }