Caching represents a mechanism to increase system performance by storing the recently used data items by reducing database trips. It acts as a temporary memory present between application and database. In general, there are four types of caches i.e.
- In-memory caching
- Database caching
- Web server caching
- CDN caching
Caching annotations in spring boot
Following annotations are used in a spring boot application.
- @EnableCaching: This annotation enables the caching capability in a spring boot application
- @Cacheable: This method level annotation tells the spring framework to make the method response is cacheable
- @CachePut: This annotation updates the cache before the method execution
- @CacheEvict: This annotation removes the specific key from the cache. If developers want to remove all the entries from the cache they can use the allEntries=true attribute
Now, open the your favorite IDE and let’s see how to implement this tutorial in spring boot.
-
Clone the repo:
git clone https://github.com/hendisantika/springboot2-ehcache3-example.git -
Go yo your folder:
cd springboot2-ehcache3-example -
Run the application:
mvn clean spring-boot:run -
Console Output:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.6.RELEASE)
2019-07-21 06:35:02.667 INFO 98567 --- [ main] .s.Springboot2Ehcache3ExampleApplication : Starting Springboot2Ehcache3ExampleApplication on Hendis-MacBook-Pro.local with PID 98567 (/Users/hendisantika/IdeaProjects/springboot2-ehcache3-example/target/classes started by hendisantika in /Users/hendisantika/IdeaProjects/springboot2-ehcache3-example)
2019-07-21 06:35:02.669 INFO 98567 --- [ main] .s.Springboot2Ehcache3ExampleApplication : No active profile set, falling back to default profiles: default
2019-07-21 06:35:03.647 WARN 98567 --- [ main] o.t.o.p.UpfrontAllocatingPageSource : Attempting to allocate 100.0MB of offheap when there is only 89.5MB of free physical memory - some paging will therefore occur.
2019-07-21 06:35:03.648 INFO 98567 --- [ main] o.t.o.p.UpfrontAllocatingPageSource : Allocating 100.0MB in chunks
2019-07-21 06:35:03.720 INFO 98567 --- [ main] org.ehcache.core.EhcacheManager : Cache 'employeeCache' created in EhcacheManager.
2019-07-21 06:35:03.793 INFO 98567 --- [ main] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=file./Users/hendisantika/IdeaProjects/springboot2-ehcache3-example/target/classes/ehcache.xml,Cache=employeeCache
2019-07-21 06:35:03.803 INFO 98567 --- [ main] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=file./Users/hendisantika/IdeaProjects/springboot2-ehcache3-example/target/classes/ehcache.xml,Cache=employeeCache
2019-07-21 06:35:03.929 INFO 98567 --- [ main] .s.Springboot2Ehcache3ExampleApplication : Started Springboot2Ehcache3ExampleApplication in 1.627 seconds (JVM running for 5.668)
Getting employee from DB
2019-07-21 06:35:03.979 INFO 98567 --- [e [_default_]-0] c.h.s.listener.CustomCacheEventLogger : Cache event = CREATED, Key = 1, Old value = null, New value = Employee [id=1, firstName=Uzumaki, lastName=Naruto]
2019-07-21 06:35:03.981 INFO 98567 --- [ main] .s.Springboot2Ehcache3ExampleApplication : Employee [id=1, firstName=Uzumaki, lastName=Naruto]
2019-07-21 06:35:03.986 INFO 98567 --- [ main] .s.Springboot2Ehcache3ExampleApplication : Employee [id=1, firstName=Uzumaki, lastName=Naruto]
2019-07-21 06:35:03.986 INFO 98567 --- [e [_default_]-0] c.h.s.listener.CustomCacheEventLogger : Cache event = CREATED, Key = 5, Old value = null, New value = Employee [id=5, firstName=Uchiha, lastName=Madara]
2019-07-21 06:35:03.987 INFO 98567 --- [ main] .s.Springboot2Ehcache3ExampleApplication : Employee [id=5, firstName=Uchiha, lastName=Madara]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 34.471 s
[INFO] Finished at: 2019-07-21T06:35:33+07:00
[INFO] ------------------------------------------------------------------------
2019-07-21 06:35:34.007 INFO 98567 --- [ Thread-8] org.ehcache.core.EhcacheManager : Cache 'employeeCache' removed from EhcacheManager.