@Override
protected void doDownload(Resource rsrc) throws IOException {
// download the resource from the specified URL
URLConnection conn = ConnectionUtil.open(rsrc.getRemote());
conn.connect();
// make sure we got a satisfactory response code
if (conn instanceof HttpURLConnection) {
HttpURLConnection hcon = (HttpURLConnection) conn;
if (hcon.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new IOException(
"Unable to download resource " + rsrc.getRemote() + ": " + hcon.getResponseCode());
}
}
long actualSize = conn.getContentLength();
log.info("Downloading resource", "url", rsrc.getRemote(), "size", actualSize);
InputStream in = null;
FileOutputStream out = null;
long currentSize = 0L;
try {
in = conn.getInputStream();
out = new FileOutputStream(rsrc.getLocal());
int read;
// TODO: look to see if we have a download info file
// containing info on potentially partially downloaded data;
// if so, use a "Range: bytes=HAVE-" header.
// read in the file data
while ((read = in.read(_buffer)) != -1) {
// write it out to our local copy
out.write(_buffer, 0, read);
// if we have no observer, then don't bother computing download statistics
if (_obs == null) {
continue;
}
// note that we've downloaded some data
currentSize += read;
updateObserver(rsrc, currentSize, actualSize);
}
} finally {
StreamUtil.close(in);
StreamUtil.close(out);
}
}
@Override
protected long checkSize(Resource rsrc) throws IOException {
URLConnection conn = ConnectionUtil.open(rsrc.getRemote());
try {
// if we're accessing our data via HTTP, we only need a HEAD request
if (conn instanceof HttpURLConnection) {
HttpURLConnection hcon = (HttpURLConnection) conn;
hcon.setRequestMethod("HEAD");
hcon.connect();
// make sure we got a satisfactory response code
if (hcon.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new IOException(
"Unable to check up-to-date for " + rsrc.getRemote() + ": " + hcon.getResponseCode());
}
}
return conn.getContentLength();
} finally {
// let it be known that we're done with this connection
conn.getInputStream().close();
}
}
protected void createPatch(
File patch, ArrayList<Resource> orsrcs, ArrayList<Resource> nrsrcs, boolean verbose)
throws IOException {
MessageDigest md = Digest.getMessageDigest();
JarOutputStream jout = null;
try {
jout = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(patch)));
// for each file in the new application, it either already exists
// in the old application, or it is new
for (Resource rsrc : nrsrcs) {
int oidx = orsrcs.indexOf(rsrc);
Resource orsrc = (oidx == -1) ? null : orsrcs.remove(oidx);
if (orsrc != null) {
// first see if they are the same
String odig = orsrc.computeDigest(md, null);
String ndig = rsrc.computeDigest(md, null);
if (odig.equals(ndig)) {
if (verbose) {
System.out.println("Unchanged: " + rsrc.getPath());
}
// by leaving it out, it will be left as is during the
// patching process
continue;
}
// otherwise potentially create a jar diff
if (rsrc.getPath().endsWith(".jar")) {
if (verbose) {
System.out.println("JarDiff: " + rsrc.getPath());
}
// here's a juicy one: JarDiff blindly pulls ZipEntry
// objects out of one jar file and stuffs them into
// another without clearing out things like the
// compressed size, so if, for whatever reason (like
// different JRE versions or phase of the moon) the
// compressed size in the old jar file is different
// than the compressed size generated when creating the
// jardiff jar file, ZipOutputStream will choke and
// we'll be hosed; so we recreate the jar files in
// their entirety before running jardiff on 'em
File otemp = rebuildJar(orsrc.getLocal());
File temp = rebuildJar(rsrc.getLocal());
jout.putNextEntry(new ZipEntry(rsrc.getPath() + Patcher.PATCH));
jarDiff(otemp, temp, jout);
otemp.delete();
temp.delete();
continue;
}
}
if (verbose) {
System.out.println("Addition: " + rsrc.getPath());
}
jout.putNextEntry(new ZipEntry(rsrc.getPath() + Patcher.CREATE));
pipe(rsrc.getLocal(), jout);
}
// now any file remaining in orsrcs needs to be removed
for (Resource rsrc : orsrcs) {
// add an entry with the resource name and the deletion suffix
if (verbose) {
System.out.println("Removal: " + rsrc.getPath());
}
jout.putNextEntry(new ZipEntry(rsrc.getPath() + Patcher.DELETE));
}
StreamUtil.close(jout);
System.out.println("Created patch file: " + patch);
} catch (IOException ioe) {
StreamUtil.close(jout);
patch.delete();
throw ioe;
}
}
