使用MongoDB为hibernate搜索实现目录提供程序

Question

我想在Heroku的网站上使用这个解决方案，所以我可以使用MongoDB索引有没有人知道一个好的教程或书籍，深入举例说明了如何做到这一点？谷歌搜索并没有给我带来任何好处。

感谢。

Answer 1

我花了很长时间在这上面因为我对Mongo DB这么新，并且没有计划使用它，直到它看起来像是Heroku上的搜索实现的一个很好的解决方案。我想我会添加这个答案来帮助其他想要做同样事情的人。

我使用了位于此处的lucene mongo db项目中的代码：

https://github.com/mongoutils/mongo-lucene

然后创建了我自己的hibernate搜索目录提供程序类，它与lucene mongo db项目接口。我使用org.hibernate.search.store.impl.RAMDirectoryProvider类作为要遵循的大纲。

剩下要做的就是让你的休眠配置指向你的新课程：

hibernate.search.default.directory_provider=com.foo.MongoLuceneDirectoryProvider

这是我的MongoLuceneDirectoryProvider类：

package com.foo.MongoLuceneDirectoryProvider

import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Properties;
import java.util.concurrent.ConcurrentMap;

import org.apache.log4j.Logger;
import org.apache.lucene.store.Directory;
import org.hibernate.search.SearchException;
import org.hibernate.search.indexes.impl.DirectoryBasedIndexManager;
import org.hibernate.search.spi.BuildContext;
import org.hibernate.search.store.DirectoryProvider;
import org.hibernate.search.store.impl.DirectoryProviderHelper;

import com.github.mongoutils.collections.DBObjectSerializer;
import com.github.mongoutils.collections.MongoConcurrentMap;
import com.github.mongoutils.collections.SimpleFieldDBObjectSerializer;
import com.github.mongoutils.lucene.MapDirectory;
import com.github.mongoutils.lucene.MapDirectoryEntry;
import com.github.mongoutils.lucene.MapDirectoryEntrySerializer;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.Mongo;
import com.mongodb.MongoException;

public class MongoLuceneDirectoryProvider implements DirectoryProvider<Directory> {

    private Logger log = Logger.getLogger(MongoLuceneDirectoryProvider.class);

    private Directory directory;

    private String indexName;
    private Properties properties;

    @Override
    public void initialize(String directoryProviderName, Properties properties, BuildContext context) {

            indexName = directoryProviderName;
        this.properties = properties;

        Mongo mongo;

        try {
            mongo = new Mongo("localhost");

            DB db = mongo.getDB("testdb");
            DBCollection dbCollection = db.getCollection("testcollection");

            DBObjectSerializer<String> keySerializer = new SimpleFieldDBObjectSerializer<String>("key");
            DBObjectSerializer<MapDirectoryEntry> valueSerializer = new MapDirectoryEntrySerializer("value");
            ConcurrentMap<String, MapDirectoryEntry> store = new MongoConcurrentMap<String, MapDirectoryEntry>(dbCollection, keySerializer, valueSerializer);

            directory = new MapDirectory(store);
        }
        catch (UnknownHostException e) {
            log.error("While attempting to initalize Mongo directory provider", e);
        }
        catch (MongoException e) {
            log.error("While attempting to initalize Mongo directory provider", e);
        }
        catch (IOException e) {
            log.error("While attempting to initalize Mongo directory provider", e);
        }
    }

    @Override
    public void start(DirectoryBasedIndexManager indexManager) {

        try {
            directory.setLockFactory(DirectoryProviderHelper.createLockFactory(null, properties));
            properties = null;
            DirectoryProviderHelper.initializeIndexIfNeeded(directory);
        }
        catch (IOException e) {
            throw new SearchException("Unable to initialize index: " + indexName, e);
        }
    }

    @Override
    public void stop() {

        try {
            directory.close();
        }
        catch (IOException e) {
            log.error("While attempting to stop directory provider", e);
        }
    }

    @Override
    public Directory getDirectory() { return this.directory; }

}

Answer 2

如果您想帮助实现它（我的意思是创建支持此配置的Java代码），请在更合适的邮件列表中加入对话：

http://lists.jboss.org/pipermail/hibernate-dev/2013-January/009329.html

在此订阅：

https://lists.jboss.org/mailman/listinfo/hibernate-dev

应该是直接编码来集成一些现有的组件。