Add minor changes

Remove unused methods
Fix API total in GET key manager API usage response
Refactor code

components/apimgt/org.wso2.carbon.apimgt.api/src/main/java/org/wso2/carbon/apimgt/api/APIAdmin.java

@@ -519,10 +519,12 @@ Map<String, Object> searchPaginatedApis(String searchQuery, String organization,
 
     /**
      * This method used to retrieve global key manager configurations with usage check
+     * @param organization organization
      * @return KeyManagerConfigurationDTO list
      * @throws APIManagementException if error occurred
      */
-    List<KeyManagerConfigurationDTO> getGlobalKeyManagerConfigurations(String organization) throws APIManagementException;
+    List<KeyManagerConfigurationDTO> getGlobalKeyManagerConfigurations(String organization)
+            throws APIManagementException;
 
     /**
      * This method used to retrieve global key manager with Id

components/apimgt/org.wso2.carbon.apimgt.api/src/main/java/org/wso2/carbon/apimgt/api/APIConsumer.java

@@ -721,17 +721,6 @@ ResourceFile getWSDL(API api, String environmentName, String environmentType, St
      */
     String getRequestedTenant();
 
-    /**
-     * Get consumer key and key manager name by application id and key mapping id
-     * @param applicationId application id
-     * @param keyMappingId  key mapping id
-     * @return  KeyManagerApplicationInfo
-     */
-    KeyManagerApplicationInfo getKeyManagerNameAndConsumerKeyByAppIDAndKeyMapping(int applicationId,
-            String keyMappingId)
-            throws APIManagementException;
-
-
     /**
      *
      * @param apiId API UUID

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIAdminImpl.java

@@ -679,12 +679,6 @@ public KeyManagerApplicationUsages getApplicationsOfKeyManager(String keyManager
         return keyManagerApplicationUsages;
     }
 
-    public List<ApplicationInfoKeyManager> getAllApplicationsOfKeyManager(String keyManagerId)
-            throws APIManagementException {
-        ApiMgtDAO apiMgtDAO = ApiMgtDAO.getInstance();
-        return apiMgtDAO.getAllApplicationsOfKeyManager(keyManagerId);
-    }
-
     private void validateKeyManagerEndpointConfiguration(KeyManagerConfigurationDTO keyManagerConfigurationDTO)
             throws APIManagementException {
         if (!APIConstants.KeyManager.DEFAULT_KEY_MANAGER.equals(keyManagerConfigurationDTO.getName())) {
@@ -984,7 +978,7 @@ public void deleteKeyManagerConfigurationById(String organization, KeyManagerCon
                             ExceptionCodes.KEY_MANAGER_DELETE_FAILED);
                 }
             } else {
-                throw new APIManagementException("Key Manager is already used by an API or and Application.",
+                throw new APIManagementException("Key Manager is already used by an API or an Application.",
                         ExceptionCodes.KEY_MANAGER_DELETE_FAILED);
             }
         }

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIConsumerImpl.java

@@ -3602,6 +3602,7 @@ public void cleanUpApplicationRegistrationByApplicationIdAndKeyMappingId(int app
 
     public boolean removalKeys(Application application, String keyMappingId, String xWSO2Tenant)
             throws APIManagementException {
+
         try {
             APIConsumer apiConsumer = APIManagerFactory.getInstance().getAPIConsumer(this.username);
 
@@ -3679,14 +3680,6 @@ public APIKey getApplicationKeyByAppIDAndKeyMapping(int applicationId, String ke
         return apiKey;
     }
 
-    @Override
-    public KeyManagerApplicationInfo getKeyManagerNameAndConsumerKeyByAppIDAndKeyMapping(int applicationId, String keyMappingId)
-            throws APIManagementException {
-        return apiMgtDAO
-                .getKeyManagerNameAndConsumerKeyByAppIdAndKeyMappingId(applicationId, keyMappingId);
-    }
-
-
     @Override
     public Set<Topic> getTopics(String apiId) throws APIManagementException {
 

components/apimgt/org.wso2.carbon.apimgt.rest.api.admin.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/admin/v1/impl/KeyManagersApiServiceImpl.java

@@ -192,7 +192,7 @@ public Response keyManagersKeyManagerIdAppUsagesGet(String keyManagerId, Integer
             throw new APIManagementException("Requested KeyManager not found", ExceptionCodes.KEY_MANAGER_NOT_FOUND);
         }
         KeyManagerApplicationUsages result = apiAdmin.getApplicationsOfKeyManager(keyManagerId, offset, limit);
-        return Response.ok().entity(result).build();
+        return Response.ok().entity(KeyManagerMappingUtil.toKeyManagerAppUsagesDTO(result)).build();
     }
 
     public Response keyManagersPost(KeyManagerDTO body, MessageContext messageContext) throws APIManagementException {

components/apimgt/org.wso2.carbon.apimgt.rest.api.admin.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/admin/v1/utils/mappings/KeyManagerMappingUtil.java

@@ -398,7 +398,7 @@ public static KeyManagerAPIUsagesDTO toKeyManagerAPIUsagesDTO(AdminContentSearch
                     apis.add(apiInfoKeyManagerDTO);
                 }
             }
-            keyManagerAPIUsagesDTO.setApiCount(result.getApiCount());
+            keyManagerAPIUsagesDTO.setApiCount(result.getApiTotal());
             keyManagerAPIUsagesDTO.setApis(apis);
         }
         return keyManagerAPIUsagesDTO;
@@ -444,7 +444,7 @@ public static ApplicationInfoKeyManagerDTO toApplicationInfoKeyManagerDTO(
             ApplicationInfoKeyManager applicationInfoKeyManager) {
 
         ApplicationInfoKeyManagerDTO applicationInfoKeyManagerDTO = new ApplicationInfoKeyManagerDTO();
-        applicationInfoKeyManagerDTO.setName(applicationInfoKeyManager.getUuid());
+        applicationInfoKeyManagerDTO.setName(applicationInfoKeyManager.getName());
         applicationInfoKeyManagerDTO.setUuid(applicationInfoKeyManager.getUuid());
         applicationInfoKeyManagerDTO.setOrganization(applicationInfoKeyManager.getOrganization());
         applicationInfoKeyManagerDTO.setOrganizationId(applicationInfoKeyManager.getOrganizationId());