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package eu.dnetlib.data.objectstore;
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import java.util.List;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.function.Function;
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import com.google.common.base.Joiner;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Queues;
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import eu.dnetlib.data.objectstore.connector.ObjectStore;
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import eu.dnetlib.data.objectstore.connector.ObjectStoreDao;
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import eu.dnetlib.data.objectstore.worker.DownloadWorker;
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import eu.dnetlib.enabling.resultset.client.ResultSetClient;
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import eu.dnetlib.rmi.common.ResultSet;
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import eu.dnetlib.rmi.data.DownloadItem;
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import eu.dnetlib.rmi.data.DownloadPlugin;
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import eu.dnetlib.rmi.data.ObjectStoreServiceException;
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import eu.dnetlib.rmi.data.Protocols;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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/**
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* The Class DownloadServiceFeeder.
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*/
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public class DownloadServiceFeeder {
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/**
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* The Constant log.
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*/
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private static final Log log = LogFactory.getLog(DownloadServiceFeeder.class);
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/**
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* The download plugin enumerator.
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*/
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@Autowired
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DownloadPluginEnumeratorImpl downloadPluginEnumerator;
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/**
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* The result set client factory.
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*/
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@Autowired
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private ResultSetClient resultSetClient;
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/**
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* The object store dao.
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*/
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@Autowired
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private ObjectStoreDao objectStoreDao;
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public static void reportException(final DownloadReportMap report, final DownloadItem di, final Throwable e) {
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final String className = e.getClass().getName();
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if (!report.containsKey(className)) {
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final DownloadReport dr = new DownloadReport();
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dr.setStackTrace(Joiner.on("\tat ").join(e.getStackTrace()));
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if (di != null) {
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dr.setDownloadItem(di);
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}
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report.put(className, dr);
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} else {
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report.get(className).incrementError();
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}
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}
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/**
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* Download and feed file into the objectStore .
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*
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* @param epr the end-point reference of the result-set of Serialized DownloadItem
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* @param plugin the plugin used to retrieve the correct URL
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* @param objectStoreID the object store id to store the data
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* @param protocol the protocol used to download the file
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* @param mimeType the mime type of the Files
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* @param numberOfThreads the number of threads to use for download at the same time
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* @throws ObjectStoreServiceException
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*/
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public DownloadReportMap download(final String epr,
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final String plugin,
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final String objectStoreID,
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final String protocol,
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final String mimeType,
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final int numberOfThreads,
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final String basePath,
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final List<String> regularExpression,
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final int connectTimeoutMs,
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final int readTimeoutMs, final int sleepTimeMs) throws ObjectStoreServiceException {
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final DownloadPlugin downloadPlugin = downloadPluginEnumerator.get(plugin);
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if ((basePath != null) && (basePath.isEmpty() == false)) {
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downloadPlugin.setBasePath(basePath);
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}
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final Iterable<String> urlInfo = resultSetClient.iter(ResultSet.fromJson(epr), String.class);
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final BlockingQueue<String> itemsQueue = Queues.newArrayBlockingQueue(numberOfThreads * 5);
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final ExecutorService executor = Executors.newFixedThreadPool(numberOfThreads);
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final ObjectStore objStore = objectStoreDao.getObjectStore(objectStoreID);
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final List<Future<DownloadReportMap>> responses = Lists.newArrayList();
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final DownloadReportMap pluginReport = new DownloadReportMap();
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pluginReport.setStatus(true);
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if (regularExpression != null) {
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downloadPlugin.setRegularExpression(regularExpression);
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}
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final Function<String, DownloadItem> applyDowunloadPlugin = input -> {
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if (input == null) {
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log.error("Input is null");
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return null;
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}
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if (input.equals(DownloadIntoObjectStoreAction.END_QUEUE_STRING)) return DownloadIntoObjectStoreAction.END_QUEUE;
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DownloadItem di = null;
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try {
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di = DownloadItem.newObjectfromJSON(input);
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if (downloadPlugin.retrieveUrl(di) == null) {
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di.setUrl(null);
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di.setOriginalUrl(null);
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}
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return di;
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} catch (Throwable e) {
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reportException(pluginReport, di, e);
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log.error("Exception on transform item :" + input, e);
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return null;
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}
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};
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for (int i = 0; i < numberOfThreads; i++) {
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responses.add(executor
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.submit(new DownloadWorker(itemsQueue, objStore, Protocols.valueOf(protocol), mimeType, connectTimeoutMs, readTimeoutMs, sleepTimeMs,
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applyDowunloadPlugin
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)));
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}
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int i = 0;
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if (urlInfo != null) {
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for (final String downloadItem : urlInfo) {
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if (downloadItem != null) {
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if ((i++ % 1000) == 0) {
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log.debug("Read " + i);
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}
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try {
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itemsQueue.put(downloadItem);
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} catch (final Exception e) {
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log.error("An error occurred while populating the download items queue: " + Joiner.on("\tat ").join(e.getStackTrace()));
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}
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}
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}
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}
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try {
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itemsQueue.put(DownloadIntoObjectStoreAction.END_QUEUE_STRING);
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} catch (final InterruptedException e) {
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log.error("An error occurred adding the loop terminator: " + Joiner.on("\tat ").join(e.getStackTrace()));
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}
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final DownloadReportMap resultMap = getDownloadReportMap(responses, pluginReport);
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executor.shutdown();
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return resultMap;
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}
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private DownloadReportMap getDownloadReportMap(final List<Future<DownloadReportMap>> responses, final DownloadReportMap pluginReport) {
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final DownloadReportMap resultMap = new DownloadReportMap();
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resultMap.setStatus(true);
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for (final Future<DownloadReportMap> currentResponse : responses) {
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try {
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final DownloadReportMap currentMap = currentResponse.get();
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mergeReport(resultMap, currentMap);
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log.info("Status " + currentMap.getStatus());
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resultMap.setStatus(resultMap.getStatus() && currentMap.getStatus());
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resultMap.setTotalDownloaded(currentMap.getTotalDownloaded() + resultMap.getTotalDownloaded());
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} catch (final Exception e) {
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log.error(e);
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resultMap.setStatus(false);
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}
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}
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mergeReport(resultMap, pluginReport);
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return resultMap;
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}
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private void mergeReport(final DownloadReportMap resultMap, final DownloadReportMap currentMap) {
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for (final String key : currentMap.keySet()) {
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if (!resultMap.containsKey(key)) {
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resultMap.put(key, currentMap.get(key));
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} else {
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final DownloadReport currentReport = currentMap.get(key);
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resultMap.get(key).incrementError(currentReport.getNumberOfOccurrences());
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}
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resultMap.setTotalDownloaded(resultMap.getTotalDownloaded() + currentMap.getTotalDownloaded());
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resultMap.setStatus(resultMap.getStatus() & currentMap.getStatus());
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}
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}
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}
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