D-Net

package eu.dnetlib.openaire.directindex.api;

import java.io.IOException;

import java.util.List;

import java.util.Map;

import javax.annotation.Resource;

import com.google.common.collect.Lists;

import com.google.common.collect.Maps;

import eu.dnetlib.data.index.CloudIndexClient;

import eu.dnetlib.data.index.CloudIndexClientException;

import eu.dnetlib.data.index.CloudIndexClientFactory;

import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpException;

import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;

import eu.dnetlib.enabling.locators.UniqueServiceLocator;

import org.apache.commons.io.IOUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cache.annotation.CacheEvict;

import org.springframework.cache.annotation.Cacheable;

import org.springframework.core.io.ClassPathResource;

public class IndexClientMap {

    private static final Log log = LogFactory.getLog(IndexClientMap.class);

    @Value(value = "${openaire.api.directindex.findSolrIndexUrl.xquery}")

    private ClassPathResource findSolrIndexUrl;

    @Value(value = "${openaire.api.directindex.findIndexDsInfo.xquery}")

    private ClassPathResource findIndexDsInfo;

    @Resource

    private UniqueServiceLocator serviceLocator;

    private Map<IndexDsInfo, CloudIndexClient> clients = Maps.newHashMap();

    public Map<IndexDsInfo, CloudIndexClient> getClients() throws DirecIndexApiException {

        try {

            final List<IndexDsInfo> idxList = calculateCurrentIndexDsInfo();

            if (idxList == null || idxList.isEmpty()) {

                throw new DirecIndexApiException("cannot create index: no public Search Service found");

            }

            if (idxList.size() > 1) {

                log.warn("found more than 1 public search service");

            }

            for(IndexDsInfo i : idxList) {

                if (!clients.containsKey(i)) {

                    clients.put(i, CloudIndexClientFactory.newIndexClient(i.getIndexBaseUrl(), i.getColl(), false));

                }

            }

            return clients;

        } catch (IOException | ISLookUpException | CloudIndexClientException e) {

            throw new DirecIndexApiException(e);

        }

    }

    @Cacheable("indexDsInfo")

    public  List<IndexDsInfo> calculateCurrentIndexDsInfo() throws IOException, ISLookUpException {

        final List<IndexDsInfo> list = Lists.newArrayList();

        final String queryUrl = IOUtils.toString(findSolrIndexUrl.getInputStream());

        final String queryDs = IOUtils.toString(findIndexDsInfo.getInputStream());

        final ISLookUpService lu = serviceLocator.getService(ISLookUpService.class);

        final String indexBaseUrl = lu.getResourceProfileByQuery(queryUrl);

        final List<String> idxDs = lu.quickSearchProfile(queryDs);

        for (final String idx : idxDs) {

            final String[] arr = idx.split("@@@");

            list.add(new IndexDsInfo(indexBaseUrl, arr[0].trim(), arr[1].trim(), arr[2].trim()));

        }

        return list;

    }

    @CacheEvict("indexDsInfo")

    public void evictCache(){

        log.info("Evicting indexDsInfo cache");

    }

}