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package eu.dnetlib.data.download.worker;
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import java.io.IOException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.Callable;
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import com.google.common.base.Function;
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import com.google.common.base.Joiner;
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import eu.dnetlib.data.download.DownloadReport;
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import eu.dnetlib.data.download.DownloadReportMap;
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import eu.dnetlib.data.download.DownloadServiceImpl;
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import eu.dnetlib.data.download.rmi.DownloadItem;
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import eu.dnetlib.data.objectstore.modular.ObjectStoreRecord;
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import eu.dnetlib.data.objectstore.modular.connector.ObjectStore;
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import eu.dnetlib.data.objectstore.rmi.ObjectStoreFile;
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import eu.dnetlib.data.objectstore.rmi.ObjectStoreServiceException;
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import eu.dnetlib.data.objectstore.rmi.Protocols;
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import org.apache.commons.lang.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* The Class DownloadWorker is a worker responsible to download the data into the object store.
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*/
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public class DownloadWorker implements Callable<DownloadReportMap> {
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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(DownloadWorker.class);
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/**
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* The queue.
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*/
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private BlockingQueue<String> queue = null;
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/**
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* The object store.
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*/
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private ObjectStore objectStore = null;
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/**
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* The protocol.
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*/
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private Protocols protocol;
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/**
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* The mime type.
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*/
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private String mimeType;
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private Function<String, DownloadItem> converter;
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/**
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* Instantiates a new download worker.
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*
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* @param queue
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* the queue
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* @param objectStore
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* the object store
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* @param protocol
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* the protocol
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* @param mimeType
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* the mime type
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*/
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public DownloadWorker(final BlockingQueue<String> queue, final ObjectStore objectStore, final Protocols protocol, final String mimeType,
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final Function<String, DownloadItem> converter) {
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this.setConverter(converter);
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this.setQueue(queue);
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this.setObjectStore(objectStore);
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this.setMimeType(mimeType);
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this.setProtocol(protocol);
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}
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/*
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* (non-Javadoc)
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*
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* @see java.lang.Runnable#run()
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*/
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@Override
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public DownloadReportMap call() throws Exception {
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final DownloadReportMap report = new DownloadReportMap();
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final long threadId = Thread.currentThread().getId();
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try {
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String takedObject = queue.take();
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DownloadItem di = getConverter().apply(takedObject);
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if (log.isDebugEnabled()) {
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log.debug(takedObject);
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}
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while (DownloadServiceImpl.END_QUEUE != di) {
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log.debug(threadId + ": Reading " + takedObject);
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if (di == null) {
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log.info("the current download item is Null, skipping");
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}
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if ((di != null) && StringUtils.isNotBlank(di.getUrl()) && !checkIfExists(di)) {
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try {
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final URL toDownload = followURL(new URL(di.getUrl()), report, di);
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final ObjectStoreRecord record = new ObjectStoreRecord();
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final ObjectStoreFile metadata = new ObjectStoreFile();
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metadata.setObjectID(di.getFileName());
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metadata.setMetadataRelatedID(di.getIdItemMetadata());
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metadata.setAccessProtocol(this.protocol);
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metadata.setMimeType(this.mimeType);
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metadata.setDownloadedURL(di.getOriginalUrl());
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record.setFileMetadata(metadata);
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record.setInputStream(toDownload.openStream());
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objectStore.feedObjectRecord(record);
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report.addDowload();
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log.debug("Saved object " + metadata.toJSON());
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} catch (final Throwable e) {
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log.error("An error occurred processing the Download Item: " + di.toJSON(), e);
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reportException(report, di, e);
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}
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}
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takedObject = queue.take();
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log.debug(threadId + ": Next Object From Queue " + takedObject);
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di = getConverter().apply(takedObject);
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if (log.isDebugEnabled()) {
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log.debug(takedObject);
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}
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}
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queue.put(DownloadServiceImpl.END_QUEUE_STRING);
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} catch (final Exception e) {
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log.error("An error occured : " + Joiner.on("\tat ").join(e.getStackTrace()));
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reportException(report, null, e);
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report.setStatus(false);
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return report;
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}
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log.info("CLOSED THREAD " + threadId);
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report.setStatus(true);
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return report;
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}
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private 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.setRecordId(di.getIdItemMetadata());
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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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private URL followURL(final URL inputURL, final DownloadReportMap report, final DownloadItem di) throws IOException {
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final String ptrcl = inputURL.getProtocol();
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if (ptrcl.startsWith("file")) {
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log.debug("the protocol is File, returning " + inputURL);
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return inputURL;
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}
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HttpURLConnection conn;
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conn = (HttpURLConnection) inputURL.openConnection();
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conn.setInstanceFollowRedirects(true); // you still need to handle redirect manully.
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HttpURLConnection.setFollowRedirects(true);
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String location = inputURL.toString();
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if ((conn.getResponseCode() >= 300) && (conn.getResponseCode() < 400)) {
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location = conn.getHeaderFields().get("Location").get(0);
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conn.disconnect();
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}
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if (!location.equals(inputURL.toString())) return new URL(location);
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return inputURL;
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}
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private boolean checkIfExists(final DownloadItem di) {
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try {
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return objectStore.deliverObject(di.getFileName()) != null;
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} catch (final ObjectStoreServiceException e) {
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log.debug(e.getMessage());
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return false;
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}
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}
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/**
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* Sets the object store.
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*
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* @param objectStore
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* the objectStore to set
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*/
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public void setObjectStore(final ObjectStore objectStore) {
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this.objectStore = objectStore;
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}
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/**
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* Sets the queue.
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*
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* @param queue
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* the queue to set
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*/
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public void setQueue(final BlockingQueue<String> queue) {
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this.queue = queue;
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}
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/**
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* Sets the protocol.
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*
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* @param protocol
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* the protocol to set
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*/
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public void setProtocol(final Protocols protocol) {
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this.protocol = protocol;
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}
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/**
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* Sets the mime type.
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*
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* @param mimeType
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* the mimeType to set
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*/
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public void setMimeType(final String mimeType) {
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this.mimeType = mimeType;
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}
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public Function<String, DownloadItem> getConverter() {
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return converter;
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}
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public void setConverter(final Function<String, DownloadItem> converter) {
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this.converter = converter;
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}
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}
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