I. Scenario Description ​

When facing scenarios with large data volumes and full-text search requirements, in a distributed architecture system, setting up ElasticSearch is usually considered a conventional solution. In the Oinone system, the enhanced model is specifically designed to address such scenarios, with its underlying layer actually integrating ElasticSearch.

II. Background Introduction ​

  • Gain a comprehensive understanding of ElasticSearch, covering content including but not limited to: Index, tokenization, Node, Document, Shards, and Replicas. For detailed information, refer to the official website: https://www.elastic.co/cn/.
  • Ensure there is a usable ElasticSearch environment that meets the requirement for local projects to reference it.

III. Precondition Constraints ​

The enhanced model incrementally depends on real-time data change messages, so ensure the project's event is enabled and the mq configuration is correct.

IV. Steps to Introduce Search in the Project ​

(I) Adding Relevant Dependencies to the Boot Project ​

  • The boot project needs to specify the ES client package version; not specifying the version will implicitly depend on the lower version specified by the top-level spring-boot dependency management.
  • Add the project dependency of pamris-channel to the boot project.
xml
<dependency>
  <groupId>org.elasticsearch.client</groupId>
  <artifactId>elasticsearch-rest-client</artifactId>
  <version>8.4.1</version>
</dependency>
<dependency>
  <groupId>jakarta.json</groupId>
  <artifactId>jakarta.json-api</artifactId>
  <version>2.1.1</version>
</dependency>
<dependency>
  <groupId>pro.shushi.pamirs.core</groupId>
  <artifactId>pamirs-sql-record-core</artifactId>
</dependency>
<dependency>
  <groupId>pro.shushi.pamirs.core</groupId>
  <artifactId>pamirs-channel-core</artifactId>
</dependency>

(II) Adding Relevant Dependencies to the API Project ​

Add the dependency on pamirs-channel-api in XXX-api.

xml
<dependency>
  <groupId>pro.shushi.pamirs.core</groupId>
  <artifactId>pamirs-channel-api</artifactId>
</dependency>

(III) YML File Configuration ​

Add the configuration in the application-dev.yml file of pamirs-demo-boot: add channel to pamirs.boot.modules, that is, add the channel module to the startup modules. Meanwhile, pay attention to the ES configuration to ensure it matches the ES service.

yaml
pamirs:
  record:
    sql:
      #改成自己本地路径(或服务器路径)
      store: /Users/oinone/record
  boot:
    modules:
      - channel
      ## 确保也安装了sql_record
      - sql_record
  elastic:
    url: 127.0.0.1:9200

Note: For more YAML configurations, please refer to Module API.

(IV) Adding Module Dependencies to the Project's Modules ​

XXXModule adds a dependency on ChannelModule.

java
@Module(dependencies = {ChannelModule.MODULE_MODULE})

(V) Adding an Enhanced Model (Example) ​

java
package pro.shushi.pamirs.demo.api.enhance;

import pro.shushi.pamirs.channel.enmu.IncrementEnum;
import pro.shushi.pamirs.channel.meta.Enhance;
import pro.shushi.pamirs.channel.meta.EnhanceModel;
import pro.shushi.pamirs.demo.api.model.ShardingModel;
import pro.shushi.pamirs.meta.annotation.Model;
import pro.shushi.pamirs.meta.enmu.ModelTypeEnum;

@Model(displayName = "Test EnhanceModel")
@Model.model(ShardingModelEnhance.MODEL_MODEL)
@Model.Advanced(type = ModelTypeEnum.PROXY, inherited = {EnhanceModel.MODEL_MODEL})
@Enhance(shards = "3", replicas = "1", reAlias = true, increment = IncrementEnum.OPEN)
public class ShardingModelEnhance extends ShardingModel {
    public static final String MODEL_MODEL = "demo.ShardingModelEnhance";
}

(VI) Restarting the System to See the Effect ​

  • Enter the [Transport Enhanced Model] application, visit the enhanced model list, and you will find a record. Click [Full Synchronization] to initialize ES and perform a full dump of data.
  • Return to the Demo application again, enter the enhanced model page, and you can normally access and perform CRUD operations.

V. Personalized Dump Logic ​

Generally, dump logic has personalized requirements, so we can override the synchronize method of the model. The function overriding feature has been described in detail in the "Object-Oriented - Inheritance and Polymorphism" section.

(I) Overriding the synchronize Method of the ShardingModelEnhance Model ​

After overriding, if old data records need to automatically fill in new fields, you can enter the [Transport Enhanced Model] application, visit the enhanced model list, find the corresponding record, and click [Full Synchronization].

java
package pro.shushi.pamirs.demo.api.enhance;

import pro.shushi.pamirs.channel.enmu.IncrementEnum;
import pro.shushi.pamirs.channel.meta.Enhance;
import pro.shushi.pamirs.channel.meta.EnhanceModel;
import pro.shushi.pamirs.demo.api.model.ShardingModel;
import pro.shushi.pamirs.meta.annotation.Field;
import pro.shushi.pamirs.meta.annotation.Function;
import pro.shushi.pamirs.meta.annotation.Model;
import pro.shushi.pamirs.meta.enmu.FunctionTypeEnum;
import pro.shushi.pamirs.meta.enmu.ModelTypeEnum;

import java.util.List;

@Model(displayName = "Test EnhanceModel")
@Model.model(ShardingModelEnhance.MODEL_MODEL)
@Model.Advanced(type = ModelTypeEnum.PROXY, inherited = {EnhanceModel.MODEL_MODEL})
@Enhance(shards = "3", replicas = "1", reAlias = true, increment = IncrementEnum.OPEN)
public class ShardingModelEnhance extends ShardingModel {
    public static final String MODEL_MODEL = "demo.ShardingModelEnhance";

    @Field(displayName = "nick")
    private String nick;

    @Function.Advanced(displayName = "Synchronize Data", type = FunctionTypeEnum.UPDATE)
    @Function(summary = "Data Synchronization Function")
    public List<ShardingModelEnhance> synchronize(List<ShardingModelEnhance> data) {
        for (ShardingModelEnhance shardingModelEnhance : data) {
            shardingModelEnhance.setNick(shardingModelEnhance.getName());
        }
        return data;
    }
}

In general, dump logic often has personalized requirements. In this case, we can override the synchronize method of the model. The function overriding feature has been described in detail in the "Object-Oriented - Inheritance and Polymorphism" section.

VI. Personalized Search Function ​

java
@Function(
    summary = "Search Function",
    openLevel = {FunctionOpenEnum.LOCAL, FunctionOpenEnum.REMOTE, FunctionOpenEnum.API}
)
@pro.shushi.pamirs.meta.annotation.Function.Advanced(
    type = {FunctionTypeEnum.QUERY},
    category = FunctionCategoryEnum.QUERY_PAGE,
    managed = true
)
public Pagination<ShardingModelEnhance> search(Pagination<ShardingModelEnhance> page, IWrapper<ShardingModelEnhance> queryWrapper) {
    System.out.println("Your personalized search logic");
    return ((IElasticRetrieve) CommonApiFactory.getApi(IElasticRetrieve.class)).search(page, queryWrapper);
}

VII. Example of Personalized Search Function ​

java
@Override
@SuppressWarnings({"rawtypes"})
public <T> Pagination<T> search(Pagination<T> page, IWrapper<T> queryWrapper) {
    String modelModel = queryWrapper.getModel();
    if (null == modelModel || modelModel.isEmpty()) {
        return page;
    }
    ModelConfig modelCfg = PamirsSession.getContext().getModelConfig(modelModel);
    if (null == modelCfg) {
        return page;
    }
    String rsql = queryWrapper.getOriginRsql();
    if (StringUtils.isBlank(rsql)) {
        rsql = "id>0";
    }
    BoolQuery.Builder queryBuilder = ElasticRSQLHelper.parseRSQL(modelCfg, rsql);
    TermQuery isDeletedTerm = QueryBuilders.term()
    .queryName(IS_DELETED)
    .field(IS_DELETED).value(0)
    .build();
    BoolQuery.Builder builder = QueryBuilders.bool().must(new Query(queryBuilder.build()));
    builder.must(new Query(isDeletedTerm));
    String alias = IndexNaming.aliasByModel(modelModel);
    Query query = new Query(builder.build());
    log.info("{}", query);

    List<Order> orders = Optional.ofNullable(page.getSort()).map(Sort::getOrders).orElse(new ArrayList<>());
    int currentPage = Optional.ofNullable(page.getCurrentPage()).orElse(1);
    Long size = Optional.ofNullable(page.getSize()).orElse(10L);
    int pageSize = size.intValue();
    List<SortOptions> sortOptions = new ArrayList<>();
    if (CollectionUtils.isEmpty(orders)) {
        orders.add(new Order(SortDirectionEnum.DESC, ID));
        orders.add(new Order(SortDirectionEnum.DESC, CREATE_DATE));
    }
    for (Order order : orders) {
        sortOptions.add(new SortOptions.Builder()
                        .field(SortOptionsBuilders.field()
                               .field(order.getField())
                               .order(SortDirectionEnum.DESC.equals(order.getDirection()) ? SortOrder.Desc : SortOrder.Asc)
                               .build())
                        .build());
    }

    SearchRequest request = new SearchRequest.Builder()
    .index(alias)
    .from((currentPage - 1) * pageSize)
    .size(pageSize)
    .sort(sortOptions)
    .query(query)
    .highlight(_builder ->
               _builder.numberOfFragments(4)
               .fragmentSize(50)
               .type(HighlighterType.Unified)
               .fields("name", HighlightField.of(_fieldBuilder -> _fieldBuilder.preTags(ElasticsearchConstant.HIGH_LIGHT_PREFIX).postTags(ElasticsearchConstant.HIGH_LIGHT_POSTFIX)))
               .fields("documentNo", HighlightField.of(_fieldBuilder -> _fieldBuilder.preTags(ElasticsearchConstant.HIGH_LIGHT_PREFIX).postTags(ElasticsearchConstant.HIGH_LIGHT_POSTFIX)))
               .fields("keywords", HighlightField.of(_fieldBuilder -> _fieldBuilder.preTags(ElasticsearchConstant.HIGH_LIGHT_PREFIX).postTags(ElasticsearchConstant.HIGH_LIGHT_POSTFIX))))
    .build();

    SearchResponse<HashMap> response = null;
    try {
        log.info("ES search request parameters: {}", request.toString());
        response = elasticsearchClient.search(request, HashMap.class);
    } catch (ElasticsearchException e) {
        log.error("Index exception", e);
        PamirsSession.getMessageHub()
        .msg(Message.init()
             .setLevel(InformationLevelEnum.WARN)
             .msg("Index exception"));
        return page;
    } catch (IOException e) {
        log.error("ElasticSearch runtime status exception", e);
        PamirsSession.getMessageHub()
        .msg(Message.init()
             .setLevel(InformationLevelEnum.WARN)
             .msg("ElasticSearch runtime status exception"));
        return page;
    }

    if (null == response || response.timedOut()) {
        return page;
    }

    HitsMetadata<HashMap> hits = response.hits();
    if (null == hits) {
        return page;
    }

    TotalHits totalHits = hits.total();
    long total = Optional.ofNullable(totalHits).map(TotalHits::value).orElse(0L);

    List<HashMap> dataMapList = Optional.of(hits)
    .map(HitsMetadata<HashMap>::hits)
    .map(hitsMap -> {
        hitsMap.stream().forEach(highlightForEach -> {
            highlightForEach.highlight().forEach((key, value) -> {
                if (highlightForEach.source().containsKey(key)) {
                    highlightForEach.source().put(key, value.get(0));
                }
            });

        });
        return hitsMap;
    })
    .map(List::stream)
    .orElse(Stream.empty())
    .map(Hit::source)
    .collect(Collectors.toList());

    List<T> context = persistenceDataConverter.out(modelModel, dataMapList);

    page.setSize(size);
    page.setTotalElements(total);
    page.setContent(context);
    log.info("ES search request parameter return total,{}", total);
    return page;
}