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[BAEL-6318] code for consuming Page<Entity> using rest template

This commit is contained in:
uzma 2023-07-02 17:45:59 +01:00
parent 1db057ebc8
commit b61c2af4ac
9 changed files with 346 additions and 0 deletions
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36
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/CustomPageImpl.java Normal file
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package com.baeldung.pageentityresponse;
import java.util.ArrayList;
import java.util.List;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.JsonNode;
@JsonIgnoreProperties(ignoreUnknown = true)
public class CustomPageImpl<T> extends PageImpl<T> {
@JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
public CustomPageImpl(@JsonProperty("content") List<T> content, @JsonProperty("number") int number, @JsonProperty("size") int size, @JsonProperty("totalElements") Long totalElements, @JsonProperty("pageable") JsonNode pageable,
@JsonProperty("last") boolean last, @JsonProperty("totalPages") int totalPages, @JsonProperty("sort") JsonNode sort, @JsonProperty("numberOfElements") int numberOfElements) {
super(content, PageRequest.of(number, 1), 10);
}
public CustomPageImpl(List<T> content, Pageable pageable, long total) {
super(content, pageable, total);
}
public CustomPageImpl(List<T> content) {
super(content);
}
public CustomPageImpl() {
super(new ArrayList<>());
}
}

32
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/EmployeeClient.java Normal file
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package com.baeldung.pageentityresponse;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;
@Component
public class EmployeeClient {
private final RestTemplate restTemplate;
public EmployeeClient(RestTemplate restTemplate) {
this.restTemplate = restTemplate;
}
public Page<EmployeeDto> getEmployeeDataFromExternalAPI(Pageable pageable) {
String url = "http://localhost:8080/external-service/employee";
UriComponentsBuilder uriBuilder = UriComponentsBuilder.fromUriString(url)
.queryParam("page", pageable.getPageNumber())
.queryParam("size", pageable.getPageSize());
ResponseEntity<CustomPageImpl<EmployeeDto>> responseEntity = restTemplate.exchange(uriBuilder.toUriString(), HttpMethod.GET, null, new ParameterizedTypeReference<CustomPageImpl<EmployeeDto>>() {
});
return responseEntity.getBody();
}
}

56
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/EmployeeController.java Normal file
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package com.baeldung.pageentityresponse;
import java.util.ArrayList;
import java.util.List;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/organisation")
public class EmployeeController {
private final EmployeeService organisationService;
public EmployeeController(EmployeeService organisationService) {
this.organisationService = organisationService;
}
@GetMapping("/employee")
public ResponseEntity<Page<EmployeeDto>> getEmployeeData(Pageable pageable) {
Page<EmployeeDto> employeeData = organisationService.getEmployeeData(pageable);
return ResponseEntity.ok(employeeData);
}
@GetMapping("/data")
public ResponseEntity<Page<EmployeeDto>> getData(@RequestParam(defaultValue = "0") int page, @RequestParam(defaultValue = "10") int size) {
List<EmployeeDto> empList = listImplementation();
int totalSize = empList.size();
int startIndex = page * size;
int endIndex = Math.min(startIndex + size, totalSize);
List<EmployeeDto> pageContent = empList.subList(startIndex, endIndex);
Page<EmployeeDto> employeeDtos = new PageImpl<>(pageContent, PageRequest.of(page, size), totalSize);
return ResponseEntity.ok()
.body(employeeDtos);
}
private static List<EmployeeDto> listImplementation() {
List<EmployeeDto> empList = new ArrayList<>();
empList.add(new EmployeeDto("Jane", "Finance", 50000));
empList.add(new EmployeeDto("Sarah", "IT", 70000));
empList.add(new EmployeeDto("John", "IT", 90000));
return empList;
}
}

48
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/EmployeeDto.java Normal file
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package com.baeldung.pageentityresponse;
import com.fasterxml.jackson.annotation.JsonProperty;
public class EmployeeDto {
@JsonProperty("name")
private String name;
@JsonProperty("dept")
private String dept;
@JsonProperty("salary")
private long salary;
public EmployeeDto() {
}
public EmployeeDto(String name, String dept, long salary) {
this.name = name;
this.dept = dept;
this.salary = salary;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDept() {
return dept;
}
public void setDept(String dept) {
this.dept = dept;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
}

18
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/EmployeeService.java Normal file
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package com.baeldung.pageentityresponse;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
@Service
public class EmployeeService {
private final EmployeeClient employeeClient;
public EmployeeService(EmployeeClient employeeClient) {
this.employeeClient = employeeClient;
}
public Page<EmployeeDto> getEmployeeData(Pageable pageable) {
return employeeClient.getEmployeeDataFromExternalAPI(pageable);
}
}

12
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/PageEntityResponseApp.java Normal file
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package com.baeldung.pageentityresponse;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class PageEntityResponseApp {
public static void main(String[] args) {
SpringApplication.run(PageEntityResponseApp.class, args);
}
}

15
persistence-modules/spring-data-rest-2/src/main/java/com/baeldung/pageentityresponse/RestTemplateConfig.java Normal file
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package com.baeldung.pageentityresponse;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class RestTemplateConfig {
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}

65
persistence-modules/spring-data-rest-2/src/test/java/com/baeldung/pageentityresponse/EmployeeClientUnitTest.java Normal file
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package com.baeldung.pageentityresponse;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.eq;
import static org.mockito.Mockito.isNull;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import java.util.Arrays;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
public class EmployeeClientUnitTest {
@Test
void givenRestTemplate_whenGetEmployeeDataFromExternalAPI_thenGetPageDataWithContents() {
CustomPageImpl<EmployeeDto> mockedResponse = new CustomPageImpl<>(Arrays.asList(
new EmployeeDto("Jane", "Finance", 50000),
new EmployeeDto("Sarah", "IT", 70000),
new EmployeeDto("John", "IT", 90000)
));
RestTemplate restTemplate = mock(RestTemplate.class);
ResponseEntity<CustomPageImpl<EmployeeDto>> responseEntity = new ResponseEntity<>(mockedResponse,
HttpStatus.OK);
String url = "http://localhost:8080/employee";
int pageNumber = 0;
int pageSize = 10;
String expectedUrl = url + "?page=" + pageNumber + "&size=" + pageSize;
HttpMethod expectedMethod = HttpMethod.GET;
ParameterizedTypeReference<CustomPageImpl<EmployeeDto>> responseType = new ParameterizedTypeReference<CustomPageImpl<EmployeeDto>>() {
};
Mockito.when(restTemplate.exchange(
expectedUrl,
expectedMethod,
null,
responseType
)).thenReturn(responseEntity);
EmployeeClient employeeClient = new EmployeeClient(restTemplate);
Page<EmployeeDto> result = employeeClient.getEmployeeDataFromExternalAPI(
PageRequest.of(pageNumber, pageSize)
);
verify(restTemplate).exchange(
eq(expectedUrl),
eq(expectedMethod),
isNull(),
eq(responseType)
);
assertEquals(1, result.getNumberOfElements());
assertEquals(mockedResponse, result.getContent().get(0));
}
}

64
persistence-modules/spring-data-rest-2/src/test/java/com/baeldung/pageentityresponse/EmployeeControllerIntegrationTest.java Normal file
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package com.baeldung.pageentityresponse;
import static org.junit.jupiter.api.Assertions.*;
import java.util.List;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.data.domain.PageImpl;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import static org.junit.jupiter.api.Assertions.assertEquals;
@SpringBootTest(classes = PageEntityResponseApp.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureMockMvc
public class EmployeeControllerIntegrationTest {
@LocalServerPort
private int port;
@Autowired
private TestRestTemplate restTemplate;
@Test
void givenGetData_whenRestTemplateExchange_thenReturnsPageOfEmployee() {
ResponseEntity<CustomPageImpl<EmployeeDto>> responseEntity = restTemplate.exchange(
"http://localhost:" + port + "/organisation/data",
HttpMethod.GET,
null,
new ParameterizedTypeReference<CustomPageImpl<EmployeeDto>>() {}
);
assertEquals(200, responseEntity.getStatusCodeValue());
PageImpl<EmployeeDto> restPage = responseEntity.getBody();
assertNotNull(restPage);
assertEquals(10, restPage.getTotalElements());
List<EmployeeDto> content = restPage.getContent();
assertNotNull(content);
assertEquals(3, content.size());
EmployeeDto employee1 = content.get(0);
assertEquals("Jane", employee1.getName());
assertEquals("Finance", employee1.getDept());
assertEquals(50000, employee1.getSalary());
EmployeeDto employee2 = content.get(1);
assertEquals("Sarah", employee2.getName());
assertEquals("IT", employee2.getDept());
assertEquals(70000, employee2.getSalary());
EmployeeDto employee3 = content.get(2);
assertEquals("John", employee3.getName());
assertEquals("IT", employee3.getDept());
assertEquals(90000, employee3.getSalary());
}
}