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BAEL - 717 : Singleton EJB Beans. (#3883) 

* BAEL-717: Singleton EJB Bean

Files for BAEL-717:Singleton EJB Bean.

* BAEL-717: Singleton EJB Bean

Corrected Indentation.

* BAEL-717: Singleton EJB Bean

Corrected Indentation.

* BAEL-717: Singleton EJB Bean

Corrected Indentation.

* BAEL-717: Singleton EJB Bean

Corrected Indentation.

* BAEL-717: Singleton EJB Bean

Changed artifactId value.

* BAEL-717: Singleton EJB Bean.

Added module for Singleton EJB Bean.

* BAEL-717: Singleton EJB Bean. 

Removed Singleton EJB Bean Module.

* BAEL-717: Singleton EJB Bean

Changed the JNDI Lookup name.

* BAEL-717: Singleton EJB Bean. 

Added the "singleton-ejb-bean" module.

* BAEL-717: Singleton EJB Bean.

Corrected Indentation.

* BAEL-717: Singleton EJB Bean

Corrected Indentation.

* BAEL-717: Singleton EJB Bean.

Corrected Indentation.

* BAEL-717: Singleton EJB Bean.

Corrected Indentation.

* BAEL-717:Singleton EJB Bean.

Corrected Indentation.

* BAEL-717:Singleton EJB Bean.

Corrected Indentation.
This commit is contained in:
gautamshetty 2018-03-28 07:35:53 -05:00 committed by pauljervis
parent de06e4f6be
commit 757f634467
5 changed files with 140 additions and 0 deletions
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1
spring-ejb/pom.xml
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@ -73,5 +73,6 @@
<modules>
<module>ejb-remote-for-spring</module>
<module>spring-ejb-client</module>
<module>singleton-ejb-bean</module>
</modules>
</project>

40
spring-ejb/singleton-ejb-bean/pom.xml Normal file
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@ -0,0 +1,40 @@
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.singletonsession</groupId>
<artifactId>singleton-ejb-bean</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>EJB Singleton Session Bean</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/javax/javaee-api -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>8.0</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.openejb/tomee-embedded -->
<dependency>
<groupId>org.apache.openejb</groupId>
<artifactId>tomee-embedded</artifactId>
<version>1.7.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

12
spring-ejb/singleton-ejb-bean/src/main/java/com/baeldung/singletonbean/CountryState.java Normal file
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@ -0,0 +1,12 @@
package com.baeldung.singletonbean;
import java.util.List;
import javax.ejb.Local;
@Local
public interface CountryState {
public List<String> getStates(String country);
}

41
spring-ejb/singleton-ejb-bean/src/main/java/com/baeldung/singletonbean/CountryStateCacheBean.java Normal file
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@ -0,0 +1,41 @@
package com.baeldung.singletonbean;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.ejb.ConcurrencyManagement;
import javax.ejb.ConcurrencyManagementType;
import javax.ejb.Lock;
import javax.ejb.LockType;
import javax.ejb.Singleton;
import javax.ejb.Startup;
@Singleton
@Startup
@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)
public class CountryStateCacheBean implements CountryState {
private Map<String, List<String>> countryStatesMap = new HashMap<String, List<String>>();
@Lock(LockType.WRITE)
@PostConstruct
public void initialize() {
List<String> states = new ArrayList<String>();
states.add("Texas");
states.add("Alabama");
states.add("Alaska");
states.add("Arizona");
states.add("Arkansas");
countryStatesMap.put("UnitedStates", states);
}
@Lock(LockType.READ)
public List<String> getStates(String country) {
return countryStatesMap.get(country);
}
}

46
spring-ejb/singleton-ejb-bean/src/test/java/com/baeldung/singletonbean/CountryStateCacheBeanTest.java Normal file
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@ -0,0 +1,46 @@
package com.baeldung.singletonbean;
import static org.junit.Assert.assertArrayEquals;
import java.util.List;
import javax.ejb.embeddable.EJBContainer;
import javax.naming.Context;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.singletonbean.CountryState;
public class CountryStateCacheBeanTest {
private EJBContainer ejbContainer = null;
private Context context = null;
@Before
public void init() {
ejbContainer = EJBContainer.createEJBContainer();
context = ejbContainer.getContext();
}
@Test
public void whenCallGetStates_ReturnsStatesForCountry() throws Exception {
String[] actualStates = { "Texas", "Alabama", "Alaska", "Arizona", "Arkansas" };
CountryState countryStateBean = (CountryState) context.lookup("java:global/singleton-ejb-bean/CountryStateCacheBean");
List<String> states = countryStateBean.getStates("UnitedStates");
if (states != null) {
assertArrayEquals(states.toArray(), actualStates);
}
}
@After
public void close() {
if (ejbContainer != null)
ejbContainer.close();
}
}