為什么80%的碼農都做不了架構師？>>> ??

Using?Spring Modules?and?EHCache, one can transparently cache method results. Spring Modules uses a proxy which intercepts call to the method of bean; consults the cache to check if method was called with same parameters before, if so will return cached result.

EHCache is the actual provider of caching solution and Spring Module handles method interception and result storing in cache.

Since I am using Maven2, so added following dependancies?

?

Since I am using Maven2, so added following dependancies –

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01.<dependency>

02.<groupId>net.sf.ehcache</groupId>

03.<artifactId>ehcache</artifactId>

04.<version>1.6.1</version>

05.</dependency>

06.<dependency>

07.<groupId>org.springmodules</groupId>

08.<artifactId>spring-modules-cache</artifactId>

09.<version>0.9</version>

10.</dependency>

My complete pom.xml –

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01.<?xml?version="1.0"?encoding="UTF-8"?>

02.<project?xmlns="http://maven.apache.org/POM/4.0.0"

03.xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

04.xsi:schemaLocation="http://maven.apache.org/POM/4.0.0?http://maven.apache.org/xsd/maven-4.0.0.xsd">

05.<modelVersion>4.0.0</modelVersion>

06.<groupId>Spring</groupId>

07.<artifactId>Spring</artifactId>

08.<version>1.0</version>

09.<dependencies>

10.<dependency>

11.<groupId>org.springframework</groupId>

12.<artifactId>spring-core</artifactId>

13.<version>3.0.0.RELEASE</version>

14.</dependency>

15.<dependency>

16.<groupId>junit</groupId>

17.<artifactId>junit</artifactId>

18.<version>4.7</version>

19.</dependency>

20.<dependency>

21.<groupId>org.springframework</groupId>

22.<artifactId>spring-test</artifactId>

23.<version>3.0.0.RELEASE</version>

24.</dependency>

25.<dependency>

26.<groupId>org.springframework</groupId>

27.<artifactId>spring-beans</artifactId>

28.<version>3.0.0.RELEASE</version>

29.</dependency>

30.<dependency>

31.<groupId>org.springframework</groupId>

32.<artifactId>spring-context</artifactId>

33.<version>3.0.0.RELEASE</version>

34.</dependency>

35.<dependency>

36.<groupId>cglib</groupId>

37.<artifactId>cglib</artifactId>

38.<version>2.2</version>

39.</dependency>

40.<dependency>

41.<groupId>org.springframework</groupId>

42.<artifactId>spring-aop</artifactId>

43.<version>3.0.0.RELEASE</version>

44.</dependency>

45.<dependency>

46.<groupId>org.aspectj</groupId>

47.<artifactId>aspectjweaver</artifactId>

48.<version>1.6.6</version>

49.</dependency>

50.<dependency>

51.<groupId>mysql</groupId>

52.<artifactId>mysql-connector-java</artifactId>

53.<version>5.1.10</version>

54.</dependency>

55.<dependency>

56.<groupId>commons-dbcp</groupId>

57.<artifactId>commons-dbcp</artifactId>

58.<version>1.2.2</version>

59.</dependency>

60.<dependency>

61.<groupId>org.springframework</groupId>

62.<artifactId>spring-jdbc</artifactId>

63.<version>3.0.0.RELEASE</version>

64.</dependency>

65.<dependency>

66.<groupId>net.sf.ehcache</groupId>

67.<artifactId>ehcache</artifactId>

68.<version>1.6.1</version>

69.</dependency>

70.<dependency>

71.<groupId>org.springmodules</groupId>

72.<artifactId>spring-modules-cache</artifactId>

73.<version>0.9</version>

74.</dependency>

75.</dependencies>

76.</project>

Contact Table sql –

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1.CREATE?TABLE?`contact` (

2.`ID`?int(15)?NOT?NULL?AUTO_INCREMENT,

3.`FIRSTNAME`?varchar(50)?DEFAULT?NULL,

4.`LASTNAME`?varchar(50)?DEFAULT?NULL,

5.`EMAIL`?varchar(150)?DEFAULT?NULL,

6.PRIMARY?KEY?(`ID`),

7.UNIQUE?KEY?`EMAIL` (`EMAIL`)

8.) ENGINE=MyISAM AUTO_INCREMENT=4?DEFAULT?CHARSET=latin1

Adding ehcache namespace to Spring config file –

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01.<?xml?version="1.0"?encoding="UTF-8"?>

02.<beans?xmlns="http://www.springframework.org/schema/beans"

03.xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:aop="http://www.springframework.org/schema/aop"

04.xmlns:ehcache="http://www.springmodules.org/schema/ehcache"

05.xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd

06.http://www.springmodules.org/schema/ehcachehttp://www.springmodules.org/schema/cache/springmodules-ehcache.xsd

07.http://www.springframework.org/schema/aop?http://www.springframework.org/schema/aop/spring-aop.xsd">

08....

09.</beans>

Created ehcache.xml file in classpath.

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1.<ehcache>

2.<defaultCache

3.maxElementsInMemory="500"?eternal="true"?overflowToDisk="false"memoryStoreEvictionPolicy="LFU"/>

4.<cache?name="contactCache"?maxElementsInMemory="500"?eternal="true"?overflowToDisk="false"

5.memoryStoreEvictionPolicy="LFU"/>

6.</ehcache>

Adding caching to application-context.xml –

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01.<?xml?version="1.0"?encoding="UTF-8"?>

02.<beans?xmlns="http://www.springframework.org/schema/beans"

03.xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:aop="http://www.springframework.org/schema/aop"

04.xmlns:ehcache="http://www.springmodules.org/schema/ehcache"

05.xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd

06.http://www.springmodules.org/schema/ehcachehttp://www.springmodules.org/schema/cache/springmodules-ehcache.xsd

07.http://www.springframework.org/schema/aop?http://www.springframework.org/schema/aop/spring-aop.xsd">

08.?

09.<ehcache:config?configLocation="classpath:ehcache.xml"?/>

10.?

11.<ehcache:proxy?id="contactDAO"?refId="contactDAOTarget">

12.<ehcache:caching?cacheName="contactCache"?methodName="findAll"/>

13.<ehcache:flushing?cacheNames="contactCache"?methodName="createContact"?when="after"/>

14.</ehcache:proxy>

15.?

16.<bean?id="contactDAOTarget"?class="byteco.de.spring.ContactDAOImpl">

17.<property?name="namedParameterJdbcTemplate"?ref="jdbcTemplate"></property>

18.</bean>

19.?

20.<bean?id="datasource"?class="org.apache.commons.dbcp.BasicDataSource">

21.<property?name="driverClassName"?value="com.mysql.jdbc.Driver"/>

22.<property?name="username"?value="root"/>

23.<property?name="password"?value="password"/>

24.<property?name="initialSize"?value="5"/>

25.<property?name="url"?value="jdbc:mysql://localhost:3306/springjpa"/>

26.</bean>

27.?

28.<bean?id="jdbcTemplate"class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">

29.<constructor-arg?type="javax.sql.DataSource"?ref="datasource"/>

30.</bean>

31.</beans>

Here is my test class –

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01.package?byteco.de.spring;

02.?

03.import?org.junit.Test;

04.import?org.junit.runner.RunWith;

05.import?org.springframework.beans.factory.annotation.Autowired;

06.import?org.springframework.dao.DuplicateKeyException;

07.import?org.springframework.test.annotation.ExpectedException;

08.import?org.springframework.test.context.ContextConfiguration;

09.import?org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

10.?

11.import?java.util.List;

12.?

13.import?static?org.junit.Assert.assertTrue;

14.?

15.@RunWith(SpringJUnit4ClassRunner.class)

16.@ContextConfiguration(value =?"/application-context.xml")

17.public?class?ContactDAOTest {

18.?

19.@Autowired

20.ContactDAO contactDAO;

21.?

22.@Test

23.public?void?shouldCreateNewContact(){

24.assertTrue(contactDAO.createContact("gabbar","singh","gabbar@singh.com"));

25.assertTrue(contactDAO.createContact("kalia","singh","kalia@singh.com"));

26.}

27.?

28.@Test

29.public?void?shouldReturnListOfContact(){

30.assertTrue(contactDAO.findAll().size()>0);

31.assertTrue(contactDAO.findAll().size()>0);

32.assertTrue(contactDAO.findAll().size()>0);

33.// This will cause the cache to be cleared. refer to logs.

34.assertTrue(contactDAO.createContact("samba","singh","samba@singh.com"));

35.assertTrue(contactDAO.findAll().size()>0);

36.assertTrue(contactDAO.findAll().size()>0);

37.assertTrue(contactDAO.findAll().size()>0);

38.}

39.}

Executed test shouldCreateNewContact first then shouldReturnListOfContact. Below is the console output –

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01.DEBUG [org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor] - Autowiring by type from bean name 'byteco.de.spring.ContactDAOTest' to bean named 'contactDAO'

02.DEBUG [org.springframework.beans.factory.support.DefaultListableBeanFactory] - Returning cached instance of singleton bean 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0'

03.DEBUG [org.springframework.beans.factory.support.DefaultListableBeanFactory] - Returning cached instance of singleton bean 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0'

04.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to retrieve a cache entry using key <2056181503|2056171012> and cache model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

05.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Retrieved cache element <null>

06.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL query

07.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL statement [select * from contact]

08.DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Fetching JDBC Connection from DataSource

09.DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Returning JDBC Connection to DataSource

10.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to store the object <[0. 1 gabbar singh , 1. 2 kalia singh ]> in the cache using key <2056181503|2056171012> and model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

11.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Object was successfully stored in the cache

12.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to retrieve a cache entry using key <2056181503|2056171012> and cache model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

13.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Retrieved cache element <[0. 1 gabbar singh , 1. 2 kalia singh ]>

14.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to retrieve a cache entry using key <2056181503|2056171012> and cache model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

15.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Retrieved cache element <[0. 1 gabbar singh , 1. 2 kalia singh ]>

16.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL update

17.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL statement [insert into contact (firstname,lastname,email) values (?,?,?)]

18.DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Fetching JDBC Connection from DataSource

19.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - SQL update affected 1 rows

20.DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Returning JDBC Connection to DataSource

21.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to flush the cache using model <org.springmodules.cache.provider.ehcache.EhCacheFlushingModel@2dd59d3c[cacheNames={'contactCache'}, flushBeforeMethodExecution=false]>

22.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Cache has been flushed.

23.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to retrieve a cache entry using key <2056181503|2056171012> and cache model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

24.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Retrieved cache element <null>

25.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL query

26.DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL statement [select * from contact]

27.DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Fetching JDBC Connection from DataSource

28.DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Returning JDBC Connection to DataSource

29.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to store the object <[0. 1 gabbar singh , 1. 2 kalia singh , 2. 3 samba singh ]> in the cache using key <2056181503|2056171012> and model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

30.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Object was successfully stored in the cache

31.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to retrieve a cache entry using key <2056181503|2056171012> and cache model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

32.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Retrieved cache element <[0. 1 gabbar singh , 1. 2 kalia singh , 2. 3 samba singh ]>

33.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Attempt to retrieve a cache entry using key <2056181503|2056171012> and cache model <org.springmodules.cache.provider.ehcache.EhCacheCachingModel@1531164[cacheName='contactCache', blocking=false, cacheEntryFactory=null]>

34.DEBUG [org.springmodules.cache.provider.ehcache.EhCacheFacade] - Retrieved cache element <[0. 1 gabbar singh , 1. 2 kalia singh , 2. 3 samba singh ]>

Here are my DAO classes –

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1.package?byteco.de.spring;

2.import?java.util.List;

3.public?interface?ContactDAO {

4.boolean?createContact(String firstName, String lastName, String email);

5.List findAll();

6.}

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01.package?byteco.de.spring;

02.?

03.import?org.springframework.jdbc.core.JdbcTemplate;

04.import?org.springframework.jdbc.core.RowMapper;

05.import?org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;

06.?

07.import?java.sql.ResultSet;

08.import?java.sql.SQLException;

09.import?java.util.HashMap;

10.import?java.util.List;

11.import?java.util.Map;

12.?

13.public?class?ContactDAOImpl?implements?ContactDAO {

14.?

15.private?NamedParameterJdbcTemplate namedParameterJdbcTemplate;

16.?

17.public?void?setNamedParameterJdbcTemplate(NamedParameterJdbcTemplate namedParameterJdbcTemplate) {

18.this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;

19.}

20.?

21.public?boolean?createContact(String firstName, String lastName, String email) {

22.Map<String,String> map =?new?HashMap<String, String>();

23.map.put("firstname",firstName);

24.map.put("lastname",lastName);

25.map.put("email",email);

26.int?i = namedParameterJdbcTemplate.update("insert into contact (firstname,lastname,email) values (:firstname,:lastname,:email)", map);

27.return?i>0;

28.}

29.?

30.public?List findAll() {

31.return?namedParameterJdbcTemplate.query("select * from contact", (Map<String, ?>)?null,?newRowMapper() {

32.public?Object mapRow(ResultSet resultSet,?int?i)?throws?SQLException {

33.return?i +?". "?+ resultSet.getString(1) +?" "?+ resultSet.getString(2) +?" "?+ resultSet.getString(3) +?" ";

34.}

35.});

36.}

37.}

We are caching the result of findAll and clearing cache when createContact is executed.

轉載于:https://my.oschina.net/ChiLin/blog/686989

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