第 3 章查询远程缓存

您可以在 Data Grid 服务器上索引和查询远程缓存。

3.1. 从 Hot Rod Java 客户端查询缓存
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Data Grid 可让您通过 Hot Rod 端点，以编程方式从 Java 客户端查询远程缓存。此流程解释了如何索引查询存储书签实例的远程缓存。

先决条件

将 ProtoStream 处理器添加到 pom.xml 中。

Data Grid 为 @ProtoField 和 @ProtoDoc 注解提供此处理器，以便您可以生成 Protobuf 模式并执行查询。

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.infinispan</groupId>
      <artifactId>infinispan-bom</artifactId>
      <version>${version.infinispan}</version>
      <type>pom</type>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>org.infinispan.protostream</groupId>
    <artifactId>protostream-processor</artifactId>
    <scope>provided</scope>
  </dependency>
</dependencies>

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.infinispan</groupId>
      <artifactId>infinispan-bom</artifactId>
      <version>${version.infinispan}</version>
      <type>pom</type>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>org.infinispan.protostream</groupId>
    <artifactId>protostream-processor</artifactId>
    <scope>provided</scope>
  </dependency>
</dependencies>

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流程

在您的类中添加索引注解，如下例所示：

Book.java

import org.infinispan.protostream.annotations.ProtoDoc;
import org.infinispan.protostream.annotations.ProtoFactory;
import org.infinispan.protostream.annotations.ProtoField;

@ProtoDoc("@Indexed")
public class Book {

   @ProtoDoc("@Field(index=Index.YES, analyze = Analyze.YES, store = Store.NO)")
   @ProtoField(number = 1)
   final String title;

   @ProtoDoc("@Field(index=Index.YES, analyze = Analyze.YES, store = Store.NO)")
   @ProtoField(number = 2)
   final String description;

   @ProtoDoc("@Field(index=Index.YES, analyze = Analyze.YES, store = Store.NO)")
   @ProtoField(number = 3, defaultValue = "0")
   final int publicationYear;


   @ProtoFactory
   Book(String title, String description, int publicationYear) {
      this.title = title;
      this.description = description;
      this.publicationYear = publicationYear;
   }
   // public Getter methods omitted for brevity
}

import org.infinispan.protostream.annotations.ProtoDoc;
import org.infinispan.protostream.annotations.ProtoFactory;
import org.infinispan.protostream.annotations.ProtoField;

@ProtoDoc("@Indexed")
public class Book {

   @ProtoDoc("@Field(index=Index.YES, analyze = Analyze.YES, store = Store.NO)")
   @ProtoField(number = 1)
   final String title;

   @ProtoDoc("@Field(index=Index.YES, analyze = Analyze.YES, store = Store.NO)")
   @ProtoField(number = 2)
   final String description;

   @ProtoDoc("@Field(index=Index.YES, analyze = Analyze.YES, store = Store.NO)")
   @ProtoField(number = 3, defaultValue = "0")
   final int publicationYear;


   @ProtoFactory
   Book(String title, String description, int publicationYear) {
      this.title = title;
      this.description = description;
      this.publicationYear = publicationYear;
   }
   // public Getter methods omitted for brevity
}

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在新类中实施 SerializationContextInitializer 接口，然后添加 @AutoProtoSchemaBuilder 注释。

使用 includeClasses 参数引用包含 @ProtoField 和 @ProtoDoc 注解的类。
使用 schemaFileName 和 schemaFilePath 参数定义您生成的和文件系统路径的 Protobuf 模式的名称。

使用 schemaPackageName 参数指定 Protobuf 模式的软件包名称。

RemoteQueryInitializer.java

import org.infinispan.protostream.SerializationContextInitializer;
import org.infinispan.protostream.annotations.AutoProtoSchemaBuilder;

@AutoProtoSchemaBuilder(
      includeClasses = {
            Book.class
      },
      schemaFileName = "book.proto",
      schemaFilePath = "proto/",
      schemaPackageName = "book_sample")
public interface RemoteQueryInitializer extends SerializationContextInitializer {
}

import org.infinispan.protostream.SerializationContextInitializer;
import org.infinispan.protostream.annotations.AutoProtoSchemaBuilder;

@AutoProtoSchemaBuilder(
      includeClasses = {
            Book.class
      },
      schemaFileName = "book.proto",
      schemaFilePath = "proto/",
      schemaPackageName = "book_sample")
public interface RemoteQueryInitializer extends SerializationContextInitializer {
}

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编译您的项目。
此流程中的代码示例生成 proto/book.proto 模式和注释 Book 类的 RemoteQueryInitializerImpl.java 实现。

后续步骤

创建一个远程缓存，将数据仓库配置为索引您的实体。例如，以下远程缓存会索引您在上一步中生成的 book.proto 模式中的书签实体：

<replicated-cache name="books">
  <indexing>
    <indexed-entities>
      <indexed-entity>book_sample.Book</indexed-entity>
    </indexed-entities>
  </indexing>
</replicated-cache>

<replicated-cache name="books">
  <indexing>
    <indexed-entities>
      <indexed-entity>book_sample.Book</indexed-entity>
    </indexed-entities>
  </indexing>
</replicated-cache>

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以下 RemoteQuery 类执行以下操作：

将 RemoteQueryInitializerImpl serialization 上下文注册到 Hot Rod Java 客户端。
将 Protobuf 模式 书.proto 注册到 Data Grid Server。
将两个书签 实例 添加到远程缓存中。
执行与标题中的关键字匹配的全文本查询。

RemoteQuery.java

package org.infinispan;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

import org.infinispan.client.hotrod.RemoteCache;
import org.infinispan.client.hotrod.RemoteCacheManager;
import org.infinispan.client.hotrod.Search;
import org.infinispan.client.hotrod.configuration.ConfigurationBuilder;
import org.infinispan.query.dsl.Query;
import org.infinispan.query.dsl.QueryFactory;
import org.infinispan.query.remote.client.ProtobufMetadataManagerConstants;

public class RemoteQuery {

   public static void main(String[] args) throws Exception {
      ConfigurationBuilder clientBuilder = new ConfigurationBuilder();
      // RemoteQueryInitializerImpl is generated
      clientBuilder.addServer().host("127.0.0.1").port(11222)
            .security().authentication().username("user").password("user")
            .addContextInitializers(new RemoteQueryInitializerImpl());

      RemoteCacheManager remoteCacheManager = new RemoteCacheManager(clientBuilder.build());

      // Grab the generated protobuf schema and registers in the server.
      Path proto = Paths.get(RemoteQuery.class.getClassLoader()
            .getResource("proto/book.proto").toURI());
      String protoBufCacheName = ProtobufMetadataManagerConstants.PROTOBUF_METADATA_CACHE_NAME;
      remoteCacheManager.getCache(protoBufCacheName).put("book.proto", Files.readString(proto));

      // Obtain the 'books' remote cache
      RemoteCache<Object, Object> remoteCache = remoteCacheManager.getCache("books");

      // Add some Books
      Book book1 = new Book("Infinispan in Action", "Learn Infinispan with using it", 2015);
      Book book2 = new Book("Cloud-Native Applications with Java and Quarkus", "Build robust and reliable cloud applications", 2019);

      remoteCache.put(1, book1);
      remoteCache.put(2, book2);

      // Execute a full-text query
      QueryFactory queryFactory = Search.getQueryFactory(remoteCache);
      Query<Book> query = queryFactory.create("FROM book_sample.Book WHERE title:'java'");

      List<Book> list = query.execute().list(); // Voila! We have our book back from the cache!
   }
}

package org.infinispan;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

import org.infinispan.client.hotrod.RemoteCache;
import org.infinispan.client.hotrod.RemoteCacheManager;
import org.infinispan.client.hotrod.Search;
import org.infinispan.client.hotrod.configuration.ConfigurationBuilder;
import org.infinispan.query.dsl.Query;
import org.infinispan.query.dsl.QueryFactory;
import org.infinispan.query.remote.client.ProtobufMetadataManagerConstants;

public class RemoteQuery {

   public static void main(String[] args) throws Exception {
      ConfigurationBuilder clientBuilder = new ConfigurationBuilder();
      // RemoteQueryInitializerImpl is generated
      clientBuilder.addServer().host("127.0.0.1").port(11222)
            .security().authentication().username("user").password("user")
            .addContextInitializers(new RemoteQueryInitializerImpl());

      RemoteCacheManager remoteCacheManager = new RemoteCacheManager(clientBuilder.build());

      // Grab the generated protobuf schema and registers in the server.
      Path proto = Paths.get(RemoteQuery.class.getClassLoader()
            .getResource("proto/book.proto").toURI());
      String protoBufCacheName = ProtobufMetadataManagerConstants.PROTOBUF_METADATA_CACHE_NAME;
      remoteCacheManager.getCache(protoBufCacheName).put("book.proto", Files.readString(proto));

      // Obtain the 'books' remote cache
      RemoteCache<Object, Object> remoteCache = remoteCacheManager.getCache("books");

      // Add some Books
      Book book1 = new Book("Infinispan in Action", "Learn Infinispan with using it", 2015);
      Book book2 = new Book("Cloud-Native Applications with Java and Quarkus", "Build robust and reliable cloud applications", 2019);

      remoteCache.put(1, book1);
      remoteCache.put(2, book2);

      // Execute a full-text query
      QueryFactory queryFactory = Search.getQueryFactory(remoteCache);
      Query<Book> query = queryFactory.create("FROM book_sample.Book WHERE title:'java'");

      List<Book> list = query.execute().list(); // Voila! We have our book back from the cache!
   }
}

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第 3 章查询远程缓存

3.1. 从 Hot Rod Java 客户端查询缓存
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学习

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社区

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第 3 章 查询远程缓存

3.1. 从 Hot Rod Java 客户端查询缓存复制链接链接已复制到粘贴板!

学习

尝试、购买和销售

社区

关于红帽文档

让开源更具包容性

關於紅帽

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

第 3 章查询远程缓存

3.1. 从 Hot Rod Java 客户端查询缓存
复制链接