209 lines
7.5 KiB
Java
209 lines
7.5 KiB
Java
package eu.dnetlib.data.mdstore;
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import java.util.Comparator;
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import java.util.Date;
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import java.util.List;
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import java.util.Optional;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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import java.util.stream.StreamSupport;
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import javax.transaction.Transactional;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.jdbc.core.JdbcTemplate;
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import eu.dnetlib.data.mdstore.model.MDStore;
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import eu.dnetlib.data.mdstore.model.MDStoreCurrentVersion;
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import eu.dnetlib.data.mdstore.model.MDStoreVersion;
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import eu.dnetlib.data.mdstore.model.MDStoreWithInfo;
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import eu.dnetlib.data.mdstore.repository.MDStoreCurrentVersionRepository;
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import eu.dnetlib.data.mdstore.repository.MDStoreRepository;
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import eu.dnetlib.data.mdstore.repository.MDStoreVersionRepository;
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import eu.dnetlib.data.mdstore.repository.MDStoreWithInfoRepository;
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import eu.dnetlib.errors.MDStoreManagerException;
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public abstract class MDStoreService {
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@Autowired
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private MDStoreRepository mdstoreRepository;
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@Autowired
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private MDStoreVersionRepository mdstoreVersionRepository;
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@Autowired
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private MDStoreCurrentVersionRepository mdstoreCurrentVersionRepository;
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@Autowired
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private MDStoreWithInfoRepository mdstoreWithInfoRepository;
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@Autowired
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protected JdbcTemplate jdbcTemplate;
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private static final Logger log = LoggerFactory.getLogger(MDStoreService.class);
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public List<MDStoreWithInfo> listMdStores() {
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return StreamSupport.stream(mdstoreWithInfoRepository.findAll().spliterator(), false)
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.sorted(Comparator.comparing((Function<MDStoreWithInfo, String>) md -> md.getDatasourceName()).thenComparing(md -> md.getId()))
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.collect(Collectors.toList());
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}
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public List<String> listMdStoreIDs() {
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return mdstoreRepository.findAll().stream().map(MDStore::getId).sorted().collect(Collectors.toList());
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}
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public long countMdStores() {
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return mdstoreRepository.count();
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}
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public Iterable<MDStoreVersion> listVersions(final String mdId) {
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return mdstoreVersionRepository.findByMdstoreOrderById(mdId);
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}
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public List<String> listExpiredVersions() {
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return jdbcTemplate
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.queryForList("select v.id from mdstore_versions v left outer join mdstore_current_versions cv on (v.id = cv.current_version) where v.writing = false and v.readcount = 0 and cv.mdstore is null;", String.class);
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}
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public MDStoreWithInfo findMdStore(final String mdId) throws MDStoreManagerException {
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return mdstoreWithInfoRepository.findById(mdId).orElseThrow(() -> new MDStoreManagerException("Missing mdstore: " + mdId));
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}
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public MDStoreVersion findVersion(final String versionId) throws MDStoreManagerException {
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return mdstoreVersionRepository.findById(versionId).orElseThrow(() -> new MDStoreManagerException("Missing mdstore version: " + versionId));
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}
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@Transactional
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public String createMDStore(final String format,
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final String layout,
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final String interpretation,
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final String dsName,
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final String dsId,
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final String apiId) {
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final MDStore md = newMDStore(format, layout, interpretation, dsName, dsId, apiId);
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mdstoreRepository.save(md);
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final MDStoreVersion v = newMDStoreVersion(md.getId(), false);
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v.setLastUpdate(new Date());
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mdstoreVersionRepository.save(v);
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mdstoreCurrentVersionRepository.save(MDStoreCurrentVersion.newInstance(v));
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return md.getId();
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}
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protected abstract MDStore newMDStore(final String format,
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final String layout,
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final String interpretation,
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final String dsName,
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final String dsId,
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final String apiId);
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protected abstract MDStoreVersion newMDStoreVersion(final String mdId, final boolean writing);
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@Transactional
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public void deleteMdStore(final String mdId) throws MDStoreManagerException {
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final Optional<MDStore> md = mdstoreRepository.findById(mdId);
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if (!md.isPresent()) {
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log.error("MDStore not found: " + mdId);
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throw new MDStoreManagerException("MDStore not found: " + mdId);
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}
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if (mdstoreVersionRepository.countByMdstoreAndReadCountGreaterThan(mdId, 0) > 0) {
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log.error("Read transactions found on mdstore: " + mdId);
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throw new MDStoreManagerException("Read transactions found on mdstore: " + mdId);
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}
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if (mdstoreVersionRepository.countByMdstoreAndWriting(mdId, true) > 0) {
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log.error("Write transactions found on mdstore: " + mdId);
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throw new MDStoreManagerException("Write transactions found on mdstore: " + mdId);
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}
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mdstoreCurrentVersionRepository.deleteById(mdId);
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mdstoreVersionRepository.deleteByMdstore(mdId);
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mdstoreRepository.deleteById(mdId);
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deleteFromBackend(md.get().getHdfsPath());
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}
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@Transactional
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public MDStoreVersion startReading(final String mdId) throws MDStoreManagerException {
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final MDStoreCurrentVersion cv =
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mdstoreCurrentVersionRepository.findById(mdId).orElseThrow(() -> new MDStoreManagerException("Missing mdstore: " + mdId));
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final MDStoreVersion v = mdstoreVersionRepository.findById(cv.getCurrentVersion())
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.orElseThrow(() -> new MDStoreManagerException("Missing version: " + cv.getCurrentVersion()));
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v.setReadCount(v.getReadCount() + 1);
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mdstoreVersionRepository.save(v);
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return v;
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}
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@Transactional
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public MDStoreVersion endReading(final String versionId) throws MDStoreManagerException {
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final MDStoreVersion v = mdstoreVersionRepository.findById(versionId).orElseThrow(() -> new MDStoreManagerException("Version not found"));
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v.setReadCount(Math.max(0, v.getReadCount() - 1));
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return v;
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}
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@Transactional
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public MDStoreVersion resetReading(final String versionId) throws MDStoreManagerException {
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final MDStoreVersion v = mdstoreVersionRepository.findById(versionId).orElseThrow(() -> new MDStoreManagerException("Version not found"));
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v.setReadCount(0);
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return v;
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}
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@Transactional
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public MDStoreVersion prepareMdStoreVersion(final String mdId) {
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final MDStoreVersion v = newMDStoreVersion(mdId, true);
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mdstoreVersionRepository.save(v);
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return v;
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}
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@Transactional
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public MDStoreVersion commitMdStoreVersion(final String versionId, final long size) throws MDStoreManagerException {
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final MDStoreVersion v = mdstoreVersionRepository.findById(versionId).orElseThrow(() -> new MDStoreManagerException("Invalid version: " + versionId));
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mdstoreCurrentVersionRepository.save(MDStoreCurrentVersion.newInstance(v));
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v.setWriting(false);
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v.setSize(size);
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v.setLastUpdate(new Date());
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mdstoreVersionRepository.save(v);
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return v;
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}
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public synchronized void deleteExpiredVersions() {
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log.info("Deleting expired version...");
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for (final String versionId : listExpiredVersions()) {
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try {
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deleteMdStoreVersion(versionId, true);
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} catch (final MDStoreManagerException e) {
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log.warn("Error deleteting version " + versionId, e);
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}
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}
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log.info("Done.");
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}
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@Transactional
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public void deleteMdStoreVersion(final String versionId, final boolean force) throws MDStoreManagerException {
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final MDStoreVersion v = mdstoreVersionRepository.findById(versionId).orElseThrow(() -> new MDStoreManagerException("Version not found"));
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if (mdstoreCurrentVersionRepository
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.countByCurrentVersion(versionId) > 0) {
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throw new MDStoreManagerException("I cannot delete this version because it is the current version");
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}
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if (!force) {
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if (v.isWriting()) { throw new MDStoreManagerException("I cannot delete this version because it is in write mode"); }
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if (v.getReadCount() > 0) { throw new MDStoreManagerException("I cannot delete this version because it is in read mode"); }
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}
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mdstoreVersionRepository.delete(v);
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deleteFromBackend(v.getHdfsPath());
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}
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protected abstract void deleteFromBackend(String path) throws MDStoreManagerException;
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}
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