Frameworks

Implementation of Cache using spring and restful service(net.sf.ehcache.Cache using this package)

1)AdminController

1. @Component
2. @Path("/")
3. public class AdminController {
4. private static final Logger log = LoggerFactory
5. .getLogger(AdminController.class);
6. @Path("home.jsp")
7. @GET
8. @Produces(MediaType.TEXT_HTML)
9. public Response home() {
10. Map<String, Object> map = new HashMap<String, Object>();
11. List<String> cacheObjectList = new ArrayList<String>();
12. CacheManager cacheManager = CacheManager.getInstance();
13. String[] cacheObject = cacheManager.getCacheNames();
14. cacheObjectList = Arrays.asList(cacheObject);
15. map.put("cacheList", cacheObjectList);
16. return Response.ok(new Viewable("/home", map)).build();
17. }
18. 
    
19. @Path("cache/clear")
20. @POST
21. @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
22. public Response handleSelectedCacheClear(@FormParam("cacheList") List<String> cacheClerlist) {
23. log.debug("Entered into handleSelectedCacheClear");
24. CacheManager cacheManager = CacheManager.getInstance();
25. 
    
26. for(String cacheObject : cacheClerlist){
27. if(cacheManager.cacheExists(cacheObject)){
28. cacheManager.clearAllStartingWith(cacheObject);
29. log.warn(cacheObject +" cache cleared");
30. }
31. else{
32. log.warn(cacheObject+ " Already cache cleared");
33. }
34. }
35. return Response.status(Response.Status.OK).entity("Successfully cleared "+cacheClerlist+" caches.").build();
36. }      
37. 
    
38. @Path("cache/clear/all")
39. @POST
40. @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
41. public Response handleClearAllCache() {
42. log.debug("Entered into handleClearAllCache");
43. CacheManager.getInstance().clearAll();
44. log.warn(" All caches cleared");
45. return Response.status(Response.Status.OK)
46. .entity("Successfully cleared all caches.")
47. .build();
48. }
49. 
    
50. @Path("cache")
51. @GET
52. @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
53. public Response fetchCacheData(@QueryParam("name") String name) {
54. List<Object> elements = new ArrayList<Object>();
55. Cache cache = CacheManager.getInstance().getCache(name);
56. for (Object key: cache.getKeys()) {
57. Element element = cache.get(key);
58. if(element != null)
59. elements.add(element);
60. }
61. Map<String, Object> map = new HashMap<String, Object>();
62. map.put("elements", elements);
63. return Response.ok(new Viewable("/cacheitems", map)).build();
64. }
65. }

ehcache.xml

1. <?xml version="1.0" encoding="UTF-8"?>
2. <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true"
4. monitoring="autodetect" dynamicConfig="true">
5. 
   
6. <cache name="businessCache" maxEntriesLocalHeap="200"
7. maxEntriesLocalDisk="10000" eternal="false" diskSpoolBufferSizeMB="20"
8. timeToIdleSeconds="86400" timeToLiveSeconds="604800"
9. memoryStoreEvictionPolicy="LRU">
10. </cache>
12. <cache name="serviceCache" maxEntriesLocalHeap="200"
13. maxEntriesLocalDisk="10000" eternal="false" diskSpoolBufferSizeMB="20"
14. timeToIdleSeconds="86400" timeToLiveSeconds="604800"
15. memoryStoreEvictionPolicy="LRU">
16. </cache>
17. 
    
18. <cache name="cardCache" maxEntriesLocalHeap="200"
19. maxEntriesLocalDisk="10000" eternal="false" diskSpoolBufferSizeMB="20"
20. timeToIdleSeconds="86400" timeToLiveSeconds="604800"
21. memoryStoreEvictionPolicy="LRU">
22. </cache>
24. <cache name="communicationConfigurationCache" maxEntriesLocalHeap="200"
25. maxEntriesLocalDisk="10000" eternal="false" diskSpoolBufferSizeMB="20"
26. timeToIdleSeconds="86400" timeToLiveSeconds="604800"
27. memoryStoreEvictionPolicy="LRU">
28. </cache>
29. <cache name="communicationFormatCache" maxEntriesLocalHeap="200"
30. maxEntriesLocalDisk="10000" eternal="false" diskSpoolBufferSizeMB="20"
31. timeToIdleSeconds="86400" timeToLiveSeconds="604800"
32. memoryStoreEvictionPolicy="LRU">
33. </cache>
34. </ehcache>     

rest-servlet.xml

1. <beans xmlns="http://www.springframework.org/schema/beans"
2. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
3. xmlns:cache="http://www.springframework.org/schema/cache"
4. xsi:schemaLocation="http://www.springframework.org/schema/beans
5. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
6. http://www.springframework.org/schema/context 
7. http://www.springframework.org/schema/context/spring-context-3.0.xsd
8. http://www.springframework.org/schema/cache 
9. http://www.springframework.org/schema/cache/spring-cache.xsd">
10. 
    
11. <cache:annotation-driven cache-manager="cacheManager" />
12. <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
13. <property name="cacheManager" ref="ehcache" />
14. </bean>
15. <bean id="ehcache"
16. class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
17. <property name="configLocation" value="classpath:ehcache.xml" />
18. <property name="shared" value="true" />
19. </bean>
20. </beans>

home.jsp

1. <%@page import="java.util.Arrays"%>
2. <%@page import="java.util.List"%>
3. <%@page import="java.util.ArrayList"%>
4. <%@page contentType="text/html"%>
5. <%@page pageEncoding="UTF-8"%>
6. <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
7. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
8.    "http://www.w3.org/TR/html4/loose.dtd">
9. <html>
10. <head>
11. <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
12. <style type="text/css">
13. .submitBtnStyle {
14. margin-right: -6%;
15. margin-left: 272%;
16. position: relative;
17. }
18. .clearBtnStyle {
19. position: relative;
20. left:1%;
21. }
22. h2 {
23.     text-decoration: underline;
24. }
25. </style>
26. <script type="text/javascript">
27. function checkBoxValidation() {
28. for (var i = 0; i < document.cacheForm.cacheList.length; i++) {
29. if (!document.cacheForm.cacheList[i].checked) {
30. alert("Please select at least one cache");
31. return false;
32. } else {
33. return true;
34. }
35. }
36. }
37. </script>
38. <title>Clear Cache Checkbox</title>
39. </head>
40. <body>
41. <h2>HPS Cache Services</h2>
42. <table border="3" >
43.      <form id="clearAll"  action="cache/clear/all" method="post">
44. </form>
45. <form name="cacheForm" onsubmit="checkBoxValidation()"
46. action="cache/clear" method="post">
47. <!-- here should go some titles... -->
48. <tr>
49. <th>Select</th>
50. <th>Name of the Cache</th>
51. </tr>
52. <c:forEach var="cache" items="${it.cacheList}">
53. <tr>
54. <td><input type="checkbox" id="cacheList" name="cacheList"
55. value="${cache}"></td>
56. <td><a href="cache?name=${cache}">${cache}</a></td>
57. </tr>
58.             </c:forEach>
59. <td>
60. <input type="submit" value="Submit" class="submitBtnStyle" />
61. </td>
62. <td>
63. <input type="submit" value="Clear All" class="clearBtnStyle" form="clearAll" />
64. </td>
65. <br>
66. </form>
67. </table>
68. </body>
69. </html>

• index.jsp

• <%@ page language="java" contentType="text/html; charset=UTF-8"
•     pageEncoding="UTF-8"%>
• <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
• <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
• <html>
• <head>
• <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
• <title>Insert title here</title>
• </head>
• <body>
• <c:redirect url="/admin/home.jsp"/>
• </body>
• </html>

cacheitems.jsp

1. <%@ page language="java" contentType="text/html; charset=UTF-8"
2.     pageEncoding="UTF-8"%>
3.     <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
4. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5. <html>
6. <head>
7. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
8. <title>Insert title here</title>
9. </head>
10. <body>
11. <table border="3">
12. <tr>
13. <th>Key</th>
14. <th>Value</th>
15. </tr>
16. <c:forEach var="element" items="${it.elements}">
17. <tr>
18. <td><c:out value="${element.getObjectKey()}" /></td>
19. <td><c:out value="${element.getObjectValue()}" /></td>
20. </tr>
21.     </c:forEach>
22. </table>
23. </body>
24. </html>