/** Explode the archive into its constituent elements */
public void explode() throws CacheException {
int goodEntries = 0;
int badEntries = 0;
int entriesBetweenSleep = 0;
ArchiveReader arcReader = null;
logger.debug(
(storeArchive ? "Storing" : "Fetching") + " WARC file: " + origUrl + " will explode");
try {
// Wrap it in an ArchiveReader
logger.debug3("About to wrap stream");
arcReader = wrapStream(fetchUrl, arcStream);
logger.debug3("wrapStream() returns " + (arcReader == null ? "null" : "non-null"));
// Explode it
if (arcReader == null) {
throw new CacheException.ExploderException("no WarcReader for " + origUrl);
}
ArchivalUnit au = crawlFacade.getAu();
logger.debug("Exploding " + fetchUrl);
// Iterate through the elements in the WARC file, except the first
Iterator<ArchiveRecord> iter = arcReader.iterator();
// Skip first record
if (iter.hasNext()) iter.next();
while (iter.hasNext()) {
helper.pokeWDog();
// check need to pause
handlePause(++entriesBetweenSleep);
// handle each element in the archive
ArchiveRecord element = iter.next();
// Each element is a URL to be cached in our AU
ArchiveRecordHeader elementHeader = element.getHeader();
String elementUrl = elementHeader.getUrl();
String elementMimeType = elementHeader.getMimetype();
long elementLength = elementHeader.getLength();
long elementDate;
try {
elementDate = ArchiveUtils.parse14DigitDate(elementHeader.getDate()).getTime();
} catch (ParseException e) {
elementDate = 0;
}
logger.debug2("WARC url " + elementUrl + " mime " + elementMimeType);
// add check to determine if this is a url which should be cached
if (au.shouldBeCached(elementUrl) && elementUrl.startsWith("http:")) {
ArchiveEntry ae =
new ArchiveEntry(
elementUrl,
elementLength,
elementDate,
element, // ArchiveRecord extends InputStream
this,
fetchUrl);
ae.setHeaderFields(makeCIProperties(elementHeader));
long bytesStored = elementLength;
logger.debug3("ArchiveEntry: " + ae.getName() + " bytes " + bytesStored);
try {
helper.process(ae);
} catch (PluginException ex) {
throw new CacheException.ExploderException("helper.process() threw", ex);
}
if (ae.getBaseUrl() != null) {
if (ae.getRestOfUrl() != null && ae.getHeaderFields() != null) {
storeEntry(ae);
handleAddText(ae);
goodEntries++;
// this needs to use the correct depth ? how
CrawlUrlData cud = new CrawlUrlData(elementUrl, 0);
crawlFacade.addToParseQueue(cud);
crawlFacade.getCrawlerStatus().addContentBytesFetched(bytesStored);
}
} else {
badEntries++;
logger.debug2("Can't map " + elementUrl + " from " + archiveUrl);
}
}
}
} catch (IOException ex) {
throw new CacheException.ExploderException(ex);
} finally {
if (arcReader != null) {
try {
arcReader.close();
} catch (IOException ex) {
throw new CacheException.ExploderException(ex);
}
}
IOUtil.safeClose(arcStream);
}
// report failed fetches
if (badEntries != 0) {
String msg = archiveUrl + ": " + badEntries + "/" + goodEntries + " bad entries";
throw new CacheException.UnretryableException(msg);
}
}
