• springboot 集成 lucene


    简介

    1. 数据每分钟产生200条,使用mysql储存。
    2. 目前有数据超过700M。
    3. 按照日期查询,按月查询包含每次超过20w条以上,时间比较长。
    4. 计划使用lucene优化查询,不适用es是因为项目较小,没有更富裕的资源。

    基本步骤

    1. 引入依赖。
    2. 开发工具类。
    3. 开发索引功能,完成索引。
    4. 开发定时任务,完成数据增量更新。
    5. 开发搜索功能,可以搜索数据。

    引入依赖

    1. 修改pom文件
    
    <dependency>
        <groupId>org.apache.lucenegroupId>
        <artifactId>lucene-coreartifactId>
        <version>9.7.0version>
    dependency>
    
    
    <dependency>
        <groupId>org.apache.lucenegroupId>
        <artifactId>lucene-queryparserartifactId>
        <version>9.7.0version>
    dependency>
    
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    • 注:没有使用更多的包是因为这次优化是以long类型区间计算为主,不需要全文索引,所以有基础的包就够了。

    工具类

    1. 实现基本的生成、删除和查询。
    
    import com.xxx.common.ResponseCode;
    import com.xxx.common.exception.SystemException;
    import com.xxx.common.util.ValidUtil;
    import lombok.extern.slf4j.Slf4j;
    import org.apache.lucene.analysis.Analyzer;
    import org.apache.lucene.analysis.standard.StandardAnalyzer;
    import org.apache.lucene.document.Document;
    import org.apache.lucene.index.DirectoryReader;
    import org.apache.lucene.index.IndexReader;
    import org.apache.lucene.index.IndexWriter;
    import org.apache.lucene.index.IndexWriterConfig;
    import org.apache.lucene.search.IndexSearcher;
    import org.apache.lucene.search.ScoreDoc;
    import org.apache.lucene.search.TopDocs;
    import org.apache.lucene.store.Directory;
    import org.apache.lucene.store.FSDirectory;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    import java.io.File;
    import java.io.IOException;
    import java.nio.file.Paths;
    import java.util.ArrayList;
    import java.util.List;
    
    @Component
    @Slf4j
    public class LuceneUtil {
    
    	//索引文件存放路径
        @Value("${lucene.index.path}")
        private String luceneIndexPath;
    
    	/**
    	 生成索引方法
    	 */
        public <T> void createIndex(List<T> list, CreateDocumentHandler handler) {
            File file = new File(luceneIndexPath);
            if (!file.exists()) {
                file.mkdir();
            }
            if (ValidUtil.isEmpty(list)) {
                return;
            }
            long startTime = System.currentTimeMillis();
            IndexWriter writer = null;
            try {
                Directory dir = FSDirectory.open(Paths.get(luceneIndexPath));
                //标准分词器,会自动去掉空格啊,is a the等单词
                Analyzer analyzer = new StandardAnalyzer();
                //将标准分词器配到写索引的配置中
                IndexWriterConfig config = new IndexWriterConfig(analyzer);
                //实例化写索引对象
                writer = new IndexWriter(dir, config);
                for (T t : list) {
                    Document doc = handler.createDocument(t);
                    writer.addDocument(doc);
                }
                writer.commit();
            } catch (Exception e) {
                throw new SystemException(ResponseCode.ERROR, e);
            } finally {
                try {
                    if (null != writer) {
                        writer.close();
                    }
                } catch (Exception e) {
                    throw new SystemException(ResponseCode.ERROR, e);
                }
            }
            //记录索引结束时间
            long endTime = System.currentTimeMillis();
            log.info("建立索引耗时" + (endTime - startTime) + "毫秒");
        }
    
    	/**
    	 清楚所有索引
    	 */
        public void clean() {
            File file = new File(luceneIndexPath);
            if (!file.exists()) {
                return;
            }
            long startTime = System.currentTimeMillis();
            IndexWriter writer = null;
            try {
                Directory dir = FSDirectory.open(Paths.get(luceneIndexPath));
                //标准分词器,会自动去掉空格啊,is a the等单词
                Analyzer analyzer = new StandardAnalyzer();
                //将标准分词器配到写索引的配置中
                IndexWriterConfig config = new IndexWriterConfig(analyzer);
                //实例化写索引对象
                writer = new IndexWriter(dir, config);
                writer.deleteAll();
            } catch (Exception e) {
                throw new SystemException(ResponseCode.ERROR, e);
            } finally {
                try {
                    if (null != writer) {
                        writer.close();
                    }
                } catch (Exception e) {
                    throw new SystemException(ResponseCode.ERROR, e);
                }
            }
            //记录索引结束时间
            long endTime = System.currentTimeMillis();
            log.info("清除索引耗时" + (endTime - startTime) + "毫秒");
        }
    
    	/**
    	 查询
    	 */
        public List<Document> search(CreateQueryParamsHandler handler) {
            File file = new File(luceneIndexPath + File.separator + "write.lock");
            if (!file.exists()) {
                return new ArrayList<>();
            }
            IndexReader reader = null;
            try {
                //获取要查询的路径,也就是索引所在的位置
                Directory dir = FSDirectory.open(Paths.get(luceneIndexPath));
                reader = DirectoryReader.open(dir);
                if (reader == null) {
                    return new ArrayList<>();
                }
                //构建IndexSearcher
                IndexSearcher searcher = new IndexSearcher(reader);
                //记录索引开始时间
                long startTime = System.currentTimeMillis();
                //开始查询,查询前10条数据,将记录保存在docs中
                TopDocs docs = handler.handler(searcher);
                //记录索引结束时间
                long endTime = System.currentTimeMillis();
                log.info("索引查询耗时" + (endTime - startTime) + "毫秒");
                List<Document> result = new ArrayList<>(Long.valueOf(docs.totalHits.value).intValue());
                //取出每条查询结果
                for(ScoreDoc scoreDoc : docs.scoreDocs) {
                    Document doc = searcher.doc(scoreDoc.doc);
                    result.add(doc);
                }
                return result;
            } catch (Exception e) {
                throw new SystemException(ResponseCode.ERROR, e);
            } finally {
                try {
                    assert reader != null;
                    reader.close();
                } catch (IOException e) {
                    throw new SystemException(ResponseCode.ERROR, e);
                }
            }
        }
    }
    
    
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    生成索引功能

    public void index(Date startDate) {
        log.info("start index! Date : " + DateUtil.format(DateUtil.now()));
        Date curStartDate = startDate;
        while (true) {
            Date curEndDate = DateUtil.datePlusDays(curStartDate, 1);
            List<CurrencyData> list = currencyDataMapper.queryLuceneList(CurrencyDataForm.builder().createTimeBegin(curStartDate.getTime()).createTimeEnd(curEndDate.getTime()).build());
            log.info(String.format("index startDate = %s, endDate = %s, size = %s", DateUtil.format(curStartDate), DateUtil.format(curEndDate), list.size()));
            if (list.size() == 0) {
                CurrencyDataForm countForm = CurrencyDataForm.builder().createTimeBegin(curStartDate.getTime()).build();
                List<CurrencyData> one = currencyDataMapper.getOne(countForm);
                log.info("has more begin:" + DateUtil.format(curEndDate) + ", result: " + (one.size() > 0 ? "yes" : "no"));
                if (one.size() == 0) {
                    break;
                }
            }
            luceneUtil.createIndex(list, (CreateDocumentHandler<Data>) data -> {
                Document doc = new Document();
                //开始添加字段
                doc.add(new TextField("dId", data.getDId(), Field.Store.YES));
                doc.add(new TextField("typeId", data.getTypeId(), Field.Store.YES));
                //区间查询需要
                doc.add(new LongPoint("createTime", data.getCreateTime()));
                //储存需要
                doc.add(new StoredField("createTime", data.getCreateTime()));
                // 排序需要
                doc.add(new NumericDocValuesField("sortTime", data.getCreateTime()));
                // 第二个参数需要处理非空的情况
                doc.add(new TextField("value", (ValidUtil.isEmpty(data.getValue()) ? "" : data.getValue()) , Field.Store.YES));
                doc.add(new TextField("unit", (ValidUtil.isEmpty(data.getUnit()) ? "" : data.getUnit()) , Field.Store.YES));
                return doc;
            });
            curStartDate = curEndDate;
        }
        log.info("finish index!");
    }
    
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    • 注:每次生成1天的索引,如果本轮没数据,并且大于结束时间也没数据,结束索引。

    定时任务

    private ThreadPoolTaskExecutor tpe;
    
    tpe.execute(() -> {
        Date startDate = null;
        try {
             startDate = getLastDate();
        } catch (SystemException s) {
            luceneUtil.clean();
            startDate = DateUtil.parse(initStartTime);
        }
        try {
            index(startDate);
        } catch (Exception e) {
            log.info("生成索引异常。", e);
        } finally {
            ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
            executor.schedule(this::init, 60, TimeUnit.SECONDS);
            executor.shutdown();
        }
    });
    
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    • 注:使用线程池+延时任务,实现每60s执行一次功能。

    搜索

    public List<Data> queryIndex(Form form) {
        List<Data> result = new ArrayList<>();
    
        List<Document> documentList = luceneUtil.search((searcher) -> {
    
            BooleanQuery.Builder builder = new BooleanQuery.Builder();
    
            if (ValidUtil.isNotEmpty(form.getDId())) {
                TermQuery deviceIdQuery = new TermQuery(new Term("dId", form.getDId()));
                builder.add(deviceIdQuery, BooleanClause.Occur.MUST);
            }
    
            if (ValidUtil.isNotEmpty(form.getTypeId())) {
                TermQuery typeQuery = new TermQuery(new Term("typeId", form.getTypeId()));
                builder.add(deviceIdQuery, BooleanClause.Occur.MUST);
            }
    
            if (ValidUtil.isNotEmpty(form.getBegin()) && ValidUtil.isNotEmpty(form.getEnd())) {
                Query timeQuery = LongPoint.newRangeQuery("time", form.getBegin().getTime(), form.getEnd().getTime());
                builder.add(timeQuery, BooleanClause.Occur.MUST);
            }
    
            Sort sort = new Sort(new SortField("sortTime", SortField.Type.LONG, false));
            // 执行查询
            return searcher.search(builder.build(), form.getSize(), sort);
        });
        for (Document document : documentList) {
            Data data = new Data();
            data.setTypeId(Integer.valueOf(document.get("typeId")));
            data.setDId(Integer.valueOf(document.get("dId")));
            data.setTime(document.getField("time").numericValue().longValue());
            data.setValue(document.get("value"));
            data.setUnit(document.get("unit"));
            result.add(data);
        }
        return result;
    }
    
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  • 原文地址:https://blog.csdn.net/tianqiuhao/article/details/132048047