本篇内容主要讲解“如何使用Quarkus在Elasticsearch进行响应式”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“如何使用Quarkus在Elasticsearch进行响应式”吧!
mvn io.quarkus:quarkus-maven-plugin:1.0.1.Final:create \
-DprojectGroupId=org.otaibe.quarkus.elasticsearch.example \
-DprojectArtifactId=otaibe-quarkus-elasticsearch-example \
-DclassName="org.otaibe.quarkus.elasticsearch.example.web.controller.FruitResource" \
-Dpath="/fruits" \
-Dextensions="resteasy-jackson,elasticsearch-rest-client"
如您所见,Quarkus 中存在一个elasticsearch -rest-client ;然而,这是一个 Elasticsearch Java 低级 REST 客户端。如果我们想使用 Elasticsearch Java High Level REST Client,我们只需要将它作为依赖添加到pom.xml文件中:
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.4.0</version>
</dependency>
请确保 Elasticsearch Java Low Level REST Client 的版本与 Elasticsearch Java High Level REST Client匹配。
由于我们以响应式方式使用 Elasticsearch,因此我更喜欢使用 Project Reactor。我们必须在依赖管理部分添加 BOM:
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-bom</artifactId>
<version>Dysprosium-SR2</version>
<type>pom</type>
<scope>import</scope>
</dependency>
我们还必须添加 reactor-core 作为依赖项:
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-core</artifactId>
</dependency>
我已经在一个库中分离了公共代码,所以我们应该将这个库添加到我们的示例项目中。为此,我们将使用Jitpack。这是一项很棒的服务。你只需要为 你的
Github 项目指出 正确的方法,它就会为它构建一个工件。这是我使用它的方式:
<dependency>
<groupId>com.github.tpenakov.otaibe-commons-quarkus</groupId>
<artifactId>otaibe-commons-quarkus-core</artifactId>
<version>elasticsearch-example.02</version>
</dependency>
<dependency>
<groupId>com.github.tpenakov.otaibe-commons-quarkus</groupId>
<artifactId>otaibe-commons-quarkus-elasticsearch</artifactId>
<version>elasticsearch-example.02</version>
</dependency>
<dependency>
<groupId>com.github.tpenakov.otaibe-commons-quarkus</groupId>
<artifactId>otaibe-commons-quarkus-rest</artifactId>
<version>elasticsearch-example.02</version>
</dependency>
此外,我们应该启动 Elastisearch。最简单的方法是通过 Docker 运行它:
docker run -it --rm=true --name elasticsearch_quarkus_test \
-p 11027:9200 -p 11028:9300 \
-e "discovery.type=single-node" \
docker.elastic.co/elasticsearch/elasticsearch:7.4.0
让我们从将我们的服务连接到 Elasticsearch 开始——示例项目中的实现很简单——因此它将侦听 Quarkus 启动和关闭事件并初始化或终止连接:
package org.otaibe.quarkus.elasticsearch.example.service;
import io.quarkus.runtime.ShutdownEvent;
import io.quarkus.runtime.StartupEvent;
import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.otaibe.commons.quarkus.elasticsearch.client.service.AbstractElasticsearchService;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Observes;
@ApplicationScoped
@Getter
@Setter
@Slf4j
public class ElasticsearchService extends AbstractElasticsearchService {
public void init(@Observes StartupEvent event) {
log.info("init started");
super.init();
log.info("init completed");
}
public void shutdown(@Observes ShutdownEvent event) {
log.info("shutdown started");
super.shutdown();
log.info("shutdown completed");
}
}
连接到 Elasticsearch 的实际工作是在AbstractElasticsearchService 中完成的:
public abstract class AbstractElasticsearchService {
@ConfigProperty(name = "service.elastic-search.hosts")
String[] hosts;
@ConfigProperty(name = "service.elastic-search.num-threads", defaultValue = "10")
Optional<Integer> numThreads;
private RestHighLevelClient restClient;
private Sniffer sniffer;
@PostConstruct
public void init() {
log.info("init started");
List<HttpHost> httpHosts = Arrays.stream(hosts)
.map(s -> StringUtils.split(s, ':'))
.map(strings -> new HttpHost(strings[0], Integer.valueOf(strings[1])))
.collect(Collectors.toList());
RestClientBuilder builder = RestClient.builder(httpHosts.toArray(new HttpHost[httpHosts.size()]));
getNumThreads().ifPresent(integer ->
builder.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultIOReactorConfig(
IOReactorConfig
.custom()
.setIoThreadCount(integer)
.build())
));
restClient = new RestHighLevelClient(builder);
sniffer = Sniffer.builder(getRestClient().getLowLevelClient()).build();
log.info("init completed");
}
}
如您所见,此处的连接是按照Elasticsearch 文档 中建议的方式完成的。我的实现取决于两个配置属性:
属性文件:
service.elastic-search.hosts=localhost:11027
这是从 Docker 启动后的 Elasticsearch 连接字符串。第二个可选属性是:属性文件
service.elastic-search.num-threads
这是客户端所需的线程数。
现在,让我们创建域对象(Fruit):
package org.otaibe.quarkus.elasticsearch.example.domain;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor(staticName = "of")
public class Fruit {
public static final String ID = "id";
public static final String EXT_REF_ID = "ext_ref_id";
public static final String NAME = "name";
public static final String DESCRIPTION = "description";
public static final String VERSION = "version";
@JsonProperty(ID)
public String id;
@JsonProperty(EXT_REF_ID)
public String extRefId;
@JsonProperty(NAME)
public String name;
@JsonProperty(DESCRIPTION)
public String description;
@JsonProperty(VERSION)
public Long version;
}
让我们创建 FruitDaoImpl。它是一个高级类,用于填充 AbstractElasticsearchReactiveDaoImplementation 并实现所需的业务逻辑。这里的另一个重要部分是为 Fruit 类创建索引:
@Override
protected Mono<Boolean> createIndex() {
CreateIndexRequest request = new CreateIndexRequest(getTableName());
Map<String, Object> mapping = new HashMap();
Map<String, Object> propsMapping = new HashMap<>();
propsMapping.put(Fruit.ID, getKeywordTextAnalizer());
propsMapping.put(Fruit.EXT_REF_ID, getKeywordTextAnalizer());
propsMapping.put(Fruit.NAME, getTextAnalizer(ENGLISH));
propsMapping.put(Fruit.DESCRIPTION, getTextAnalizer(ENGLISH));
propsMapping.put(Fruit.VERSION, getLongFieldType());
mapping.put(PROPERTIES, propsMapping);
request.mapping(mapping);
return createIndex(request);
}
对 Elasticsearch 的真正创建索引调用是在父类 ( AbstractElasticsearchReactiveDaoImplementation )
中实现的:
protected Mono<Boolean> createIndex(CreateIndexRequest request) {
return Flux.<Boolean>create(fluxSink -> getRestClient().indices().createAsync(request, RequestOptions.DEFAULT, new ActionListener<CreateIndexResponse>() {
@Override
public void onResponse(CreateIndexResponse createIndexResponse) {
log.info("CreateIndexResponse: {}", createIndexResponse);
fluxSink.next(createIndexResponse.isAcknowledged());
fluxSink.complete();
}
@Override
public void onFailure(Exception e) {
log.error("unable to create index", e);
fluxSink.error(new RuntimeException(e));
}
}))
.next();
}
大多数 CRUD 操作在AbstractElasticsearchReactiveDaoImplementation中实现 。
它有 save、 update、 findById和 deleteById 公共方法。它也有findByExactMatch和 findByMatch保护方法。FindBy*当需要填充业务逻辑时,这些 方法在后代类中非常有用。
业务查找方法在FruitDaoImpl 类中实现 :
public Flux<Fruit> findByExternalRefId(String value) {
return findByMatch(Fruit.EXT_REF_ID, value);
}
public Flux<Fruit> findByName(String value) {
return findByMatch(Fruit.NAME, value);
}
public Flux<Fruit> findByDescription(String value) {
return findByMatch(Fruit.NAME, value);
}
public Flux<Fruit> findByNameOrDescription(String value) {
Map<String, Object> query = new HashMap<>();
query.put(Fruit.NAME, value);
query.put(Fruit.DESCRIPTION, value);
return findByMatch(query);
}
FruitDaoImpl 封装在 FruitService 中:
@ApplicationScoped
@Getter
@Setter
@Slf4j
public class FruitService {
@Inject
FruitDaoImpl dao;
public Mono<Fruit> save(Fruit entity) {
return getDao().save(entity);
}
public Mono<Fruit> findById(Fruit entity) {
return getDao().findById(entity);
}
public Mono<Fruit> findById(String id) {
return Mono.just(Fruit.of(id, null, null, null, null))
.flatMap(entity -> findById(entity));
}
public Flux<Fruit> findByExternalRefId(String value) {
return getDao().findByExternalRefId(value);
}
public Flux<Fruit> findByName(String value) {
return getDao().findByName(value);
}
public Flux<Fruit> findByDescription(String value) {
return getDao().findByDescription(value);
}
public Flux<Fruit> findByNameOrDescription(String value) {
return getDao().findByNameOrDescription(value);
}
public Mono<Boolean> delete(Fruit entity) {
return Mono.just(entity.getId())
.filter(s -> StringUtils.isNotBlank(s))
.flatMap(s -> getDao().deleteById(entity))
.defaultIfEmpty(false);
}
}
该 FruitServiceTests 写入,以测试基本功能。它还用于确保 Fruit 类字段被正确索引并且全文搜索按预期工作:
@Test
public void manageFruitTest() {
Fruit apple = getTestUtils().createApple();
Fruit apple1 = getFruitService().save(apple).block();
Assertions.assertNotNull(apple1.getId());
Assertions.assertTrue(apple1.getVersion() > 0);
log.info("saved result: {}", getJsonUtils().toStringLazy(apple1));
List<Fruit> fruitList = getFruitService().findByExternalRefId(TestUtils.EXT_REF_ID).collectList().block();
Assertions.assertTrue(fruitList.size() > 0);
List<Fruit> fruitList1 = getFruitService().findByNameOrDescription("bulgaria").collectList().block();
Assertions.assertTrue(fruitList1.size() > 0);
//Ensure that the full text search is working - it is 'Apples' in description
List<Fruit> fruitList2 = getFruitService().findByDescription("apple").collectList().block();
Assertions.assertTrue(fruitList2.size() > 0);
//Ensure that the full text search is working - it is 'Apple' in name
List<Fruit> fruitList3 = getFruitService().findByName("apples").collectList().block();
Assertions.assertTrue(fruitList3.size() > 0);
Boolean deleteAppleResult = getFruitService().getDao().deleteById(apple1).block();
Assertions.assertTrue(deleteAppleResult);
}
因为这是一个示例项目,完整的 CRUD 功能不会作为 REST 端点添加。只有save和 findById被添加为 REST 端点。它们被添加到 FruitResource 中。那里的方法返回 CompletionStage<Response>,这确保我们的应用程序中不会有阻塞的线程。
添加FruitResourceTest以测试 RESTendpoints:
package org.otaibe.quarkus.elasticsearch.example.web.controller;
import io.quarkus.test.junit.QuarkusTest;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.eclipse.microprofile.config.inject.ConfigProperty;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.otaibe.commons.quarkus.core.utils.JsonUtils;
import org.otaibe.quarkus.elasticsearch.example.domain.Fruit;
import org.otaibe.quarkus.elasticsearch.example.service.FruitService;
import org.otaibe.quarkus.elasticsearch.example.utils.TestUtils;
import javax.inject.Inject;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriBuilder;
import java.net.URI;
import java.util.Optional;
import static io.restassured.RestAssured.given;
@QuarkusTest
@Getter(value = AccessLevel.PROTECTED)
@Slf4j
public class FruitResourceTest {
@ConfigProperty(name = "service.http.host")
Optional<URI> host;
@Inject
TestUtils testUtils;
@Inject
JsonUtils jsonUtils;
@Inject
FruitService service;
@Test
public void restEndpointsTest() {
log.info("restEndpointsTest start");
Fruit apple = getTestUtils().createApple();
Fruit savedApple = given()
.when()
.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON)
.body(apple)
.post(getUri(FruitResource.ROOT_PATH))
.then()
.statusCode(200)
.extract()
.as(Fruit.class);
String id = savedApple.getId();
Assertions.assertTrue(StringUtils.isNotBlank(id));
URI findByIdPath = UriBuilder.fromPath(FruitResource.ROOT_PATH)
.path(id)
.build();
Fruit foundApple = given()
.when().get(getUri(findByIdPath.getPath()).getPath())
.then()
.statusCode(200)
.extract()
.as(Fruit.class);
Assertions.assertEquals(savedApple, foundApple);
Boolean deleteResult = getService().delete(foundApple).block();
Assertions.assertTrue(deleteResult);
given()
.when().get(findByIdPath.getPath())
.then()
.statusCode(Response.Status.NOT_FOUND.getStatusCode()) ;
log.info("restEndpointsTest end");
}
private URI getUri(String path) {
return getUriBuilder(path)
.build();
}
private UriBuilder getUriBuilder(String path) {
return getHost()
.map(uri -> UriBuilder.fromUri(uri))
.map(uriBuilder -> uriBuilder.path(path))
.orElse(UriBuilder
.fromPath(path)
);
}
}
在构建本机可执行文件之前,我们必须注册我们的 Fruit 域对象。这样做的原因是我们的 FruitResource 返回 CompletionStage<Response>,因此,应用程序的实际返回类型是未知的,因此我们必须显式注册它以进行反射。在 Quarkus 中至少有两种方法可以做到这一点:
通过 @RegisterForReflection 注释。
通过 反射-config.json。
我个人更喜欢第二种方法,因为您要注册的类可能在第三方库中,并且不可能将 @RegisterForReflection 放在 那里。
现在, reflection-config.json 看起来像这样:
[
{
"name" : "org.otaibe.quarkus.elasticsearch.example.domain.Fruit",
"allDeclaredConstructors" : true,
"allPublicConstructors" : true,
"allDeclaredMethods" : true,
"allPublicMethods" : true,
"allDeclaredFields" : true,
"allPublicFields" : true
}
]
下一步是让 Quarkus 知道 reflection-config.json 文件。您应该将此行添加到pom.xml文件中的 native
配置文件中:
<quarkus.native.additional-build-args>-H:ReflectionConfigurationFiles=${project.basedir}/src/main/resources/reflection-config.json</quarkus.native.additional-build-args>
您现在可以构建您的本机应用程序:
mvn clean package -Pnative
并启动它:
./target/otaibe-quarkus-elasticsearch-example-1.0-SNAPSHOT-runner
该服务将在http://localhost:11025上可用,因为这是application.properties 中明确指定的端口。
quarkus.http.port=11025
该 FruitResourceTest 预计以下可选属性:
属性文件:
service.http.host
如果存在,测试请求将命中指定的主机。如果您启动本机可执行文件:
shell:
./target/otaibe-quarkus-elasticsearch-example-1.0-SNAPSHOT-runner
并使用以下代码执行测试/构建:
shell:
mvn package -D %test.service.http .host = http://localhost:11025
测试将针对本机构建运行。
到此,相信大家对“如何使用Quarkus在Elasticsearch进行响应式”有了更深的了解,不妨来实际操作一番吧!这里是亿速云网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!
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