AfflictionNetworks/getdown
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We have liftoff! There's no fancy GUI yet, but it now downloads invalid or

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missing resources and launches the application like a champ.
This commit is contained in:
Michael Bayne
2004-07-06 05:13:36 +00:00
parent ebd2105285
commit 3795d51e15
4 changed files with 428 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/java/com/threerings/getdown/data/Application.java
+59 -1
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@@ -1,5 +1,5 @@
//
// $Id: Application.java,v 1.3 2004/07/02 17:03:33 mdb Exp $
// $Id: Application.java,v 1.4 2004/07/06 05:13:35 mdb Exp $
package com.threerings.getdown.data;
@@ -215,6 +215,64 @@ public class Application
return new File(_appdir, path);
}
/**
* Invokes the process associated with this application definition.
*/
public Process createProcess ()
throws IOException
{
// create our classpath
StringBuffer cpbuf = new StringBuffer();
for (Iterator iter = _codes.iterator(); iter.hasNext(); ) {
if (cpbuf.length() > 0) {
cpbuf.append(File.pathSeparator);
}
Resource rsrc = (Resource)iter.next();
cpbuf.append(rsrc.getLocal().getAbsolutePath());
}
// we'll need the JVM, classpath, JVM args, class name and app args
String[] args = new String[4 + _jvmargs.size() + _appargs.size()];
int idx = 0;
// reconstruct the path to the JVM
args[idx++] = System.getProperty("java.home") +
File.separator + "bin" + File.separator + "java";
// add the classpath arguments
args[idx++] = "-classpath";
args[idx++] = cpbuf.toString();
// add the JVM arguments
for (Iterator iter = _jvmargs.iterator(); iter.hasNext(); ) {
args[idx++] = processArg((String)iter.next());
}
// add the application class name
args[idx++] = _class;
// finally add the application arguments
for (Iterator iter = _appargs.iterator(); iter.hasNext(); ) {
args[idx++] = processArg((String)iter.next());
}
Log.info("Running " + StringUtil.join(args, "\n"));
return Runtime.getRuntime().exec(args, null);
}
/** Replaces the application directory and version in any argument. */
protected String processArg (String arg)
{
if (arg.indexOf("%APPDIR%") != -1) {
arg = StringUtil.replace(
arg, "%APPDIR%", _appdir.getAbsolutePath());
}
if (arg.indexOf("%VERSION%") != -1) {
arg = StringUtil.replace(arg, "%VERSION%", "" + _version);
}
return arg;
}
/**
* Loads the <code>digest.txt</code> file and verifies the contents of
* both that file and the <code>getdown.text</code> file. Then it
src/java/com/threerings/getdown/data/Resource.java
+17 -1
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@@ -1,5 +1,5 @@
//
// $Id: Resource.java,v 1.3 2004/07/02 17:03:33 mdb Exp $
// $Id: Resource.java,v 1.4 2004/07/06 05:13:36 mdb Exp $
package com.threerings.getdown.data;
@@ -39,6 +39,22 @@ public class Resource
return _path;
}
/**
* Returns the local location of this resource.
*/
public File getLocal ()
{
return _local;
}
/**
* Returns the remote location of this resource.
*/
public URL getRemote ()
{
return _remote;
}
/**
* Computes the MD5 hash of this resource's underlying file.
* <em>Note:</m> This is both CPU and I/O intensive.
src/java/com/threerings/getdown/launcher/Downloader.java
+264
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@@ -0,0 +1,264 @@
//
// $Id: Downloader.java,v 1.1 2004/07/06 05:13:36 mdb Exp $
package com.threerings.getdown.launcher;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.util.Iterator;
import java.util.List;
import com.samskivert.io.StreamUtil;
import com.threerings.getdown.Log;
import com.threerings.getdown.data.Resource;
/**
* Handles the download of a collection of files, first issuing HTTP head
* requests to obtain size information and then downloading the files
* individually, reporting progress back via a callback interface.
*/
public class Downloader extends Thread
{
/**
* An interface used to communicate status back to an external entity.
* <em>Note:</em> these methods are all called on the download thread,
* so implementors must take care to only execute thread-safe code or
* simply pass a message to the AWT thread, for example.
*/
public interface Observer
{
/**
* Called before the downloader begins the series of HTTP head
* requests to determine the size of the files it needs to
* download.
*/
public void resolvingDownloads ();
/**
* Called to inform the observer of ongoing progress toward
* completion of the overall downloading task. The caller is
* guaranteed to get at least one call reporting 100% completion.
*
* @param percent the percent completion, in terms of total file
* size, of the downloads.
* @param remaining the estimated download time remaining in
* seconds, or <code>-1</code> if the time can not yet be
* determined.
*/
public void downloadProgress (int percent, long remaining);
/**
* Called if a failure occurs while checking for an update or
* downloading a file.
*
* @param rsrc the resource that was being downloaded when the
* error occurred, or <code>null</code> if the failure occurred
* while resolving downloads.
* @param e the exception detailing the failure.
*/
public void downloadFailed (Resource rsrc, Exception e);
}
/**
* Creates a downloader that will download the supplied list of
* resources and communicate with the specified observer. The {@link
* #start} method must be called on the downloader to initiate the
* download process.
*/
public Downloader (List resources, Observer obs)
{
super("Downloader");
_resources = resources;
_obs = obs;
}
/**
* This method is invoked as the downloader thread and performs the
* actual downloading.
*/
public void run ()
{
Resource current = null;
try {
// let the observer know that we're computing download size
if (_obs != null) {
_obs.resolvingDownloads();
}
// first compute the total size of our download
for (Iterator iter = _resources.iterator(); iter.hasNext(); ) {
discoverSize((Resource)iter.next());
}
// make a note of the time at which we started the download
_start = System.currentTimeMillis();
// now actually download the files
for (Iterator iter = _resources.iterator(); iter.hasNext(); ) {
current = (Resource)iter.next();
download(current);
}
// finally report our download completion if we did not
// already do so when downloading our final resource
if (_obs != null && !_complete) {
_obs.downloadProgress(100, 0);
}
} catch (Exception e) {
if (_obs != null) {
_obs.downloadFailed(current, e);
}
}
}
/**
* Issues a HEAD request for the specified resource and notes the
* amount of data we will be downloading to account for it.
*/
protected void discoverSize (Resource rsrc)
throws IOException
{
// read the file information via an HTTP HEAD request
HttpURLConnection ucon = (HttpURLConnection)
rsrc.getRemote().openConnection();
ucon.setRequestMethod("HEAD");
ucon.connect();
// make sure we got a satisfactory response code
if (ucon.getResponseCode() != HttpURLConnection.HTTP_OK) {
String errmsg = "Unable to check up-to-date for " +
rsrc.getRemote() + ": " + ucon.getResponseCode();
throw new IOException(errmsg);
}
// add this resource's size to our total download size
_totalSize += ucon.getContentLength();
}
/**
* Downloads the specified resource from its remote location to its
* local location.
*/
protected void download (Resource rsrc)
throws IOException
{
// make sure the resource's target directory exists
File parent = new File(rsrc.getLocal().getParent());
if (!parent.exists()) {
if (!parent.mkdirs()) {
Log.warning("Failed to create target directory for " +
"resource '" + rsrc + "'. Download will " +
"certainly fail.");
}
}
// download the resource from the specified URL
HttpURLConnection ucon = (HttpURLConnection)
rsrc.getRemote().openConnection();
ucon.connect();
// make sure we got a satisfactory response code
if (ucon.getResponseCode() != HttpURLConnection.HTTP_OK) {
String errmsg = "Unable to download resource " +
rsrc.getRemote() + ": " + ucon.getResponseCode();
throw new IOException(errmsg);
}
Log.info("Downloading resource [url=" + rsrc.getRemote() + "].");
InputStream in = null;
FileOutputStream out = null;
try {
in = ucon.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;
// notify the observer if it's been sufficiently long
// since our last notification
long now = System.currentTimeMillis();
if ((now - _lastUpdate) >= UPDATE_DELAY) {
_lastUpdate = now;
// compute our bytes per second
long secs = (now - _start) / 1000L;
long bps = (secs == 0) ? 0 : (_currentSize / secs);
// compute our percentage completion
int pctdone = (int)(
(_currentSize / (float)_totalSize) * 100f);
// estimate our time remaining
long remaining = (bps <= 0) ? -1 :
(_totalSize - _currentSize) / bps;
// make sure we only report 100% exactly once
if (pctdone < 100 || !_complete) {
_complete = (pctdone == 100);
_obs.downloadProgress(pctdone, remaining);
}
}
}
} finally {
StreamUtil.close(in);
StreamUtil.close(out);
}
}
/** The list of resources to be downloaded. */
protected List _resources;
/** The observer with whom we are communicating. */
protected Observer _obs;
/** Used while downloading. */
protected byte[] _buffer = new byte[4096];
/** The total file size in bytes to be transferred. */
protected long _totalSize;
/** The file size in bytes transferred thus far. */
protected long _currentSize;
/** The time at which the file transfer began. */
protected long _start;
/** The current transfer rate in bytes per second. */
protected long _bytesPerSecond;
/** The time at which the last progress update was posted to the
* progress observer. */
protected long _lastUpdate;
/** Whether the download has completed and the progress observer
* notified. */
protected boolean _complete;
/** The delay in milliseconds between notifying progress observers of
* file download progress. */
protected static final long UPDATE_DELAY = 2500L;
}
src/java/com/threerings/getdown/launcher/Getdown.java
+88 -10
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@@ -1,5 +1,5 @@
//
// $Id: Getdown.java,v 1.3 2004/07/02 17:03:33 mdb Exp $
// $Id: Getdown.java,v 1.4 2004/07/06 05:13:36 mdb Exp $
package com.threerings.getdown.launcher;
@@ -14,6 +14,7 @@ import org.apache.commons.io.TeeOutputStream;
import com.threerings.getdown.Log;
import com.threerings.getdown.data.Application;
import com.threerings.getdown.data.Resource;
/**
* Manages the main control for the Getdown application updater and
@@ -29,26 +30,101 @@ public class Getdown
public void run ()
{
try {
_app.init();
for (int ii = 0; ii < MAX_LOOPS; ii++) {
_app.init();
if (_app.verifyMetadata()) {
Log.info("Application requires update.");
if (_app.verifyMetadata()) {
Log.info("Application requires update.");
} else {
Log.info("Metadata verified.");
List failures = _app.verifyResources();
if (failures == null) {
Log.info("Resources verified.");
} else {
Log.info(failures.size() + " resources require update.");
Log.info("Metadata verified.");
List failures = _app.verifyResources();
if (failures == null) {
Log.info("Resources verified.");
launch();
return;
} else {
Log.info(failures.size() + " rsrcs require update.");
download(failures);
// now we'll loop back and try it all again
}
}
}
Log.warning("Pants! We couldn't get the job done.");
} catch (Exception e) {
Log.logStackTrace(e);
}
}
/**
* Called if the application is determined to be of an old version.
*/
protected void update ()
{
Log.info("We're needin' an update Cap'n!");
}
/**
* Called if the application is determined to require resource
* downloads.
*/
protected void download (List resources)
{
final Object lock = new Object();
// create a downloader to download our resources
Downloader.Observer obs = new Downloader.Observer() {
public void resolvingDownloads () {
Log.info("Resolving downloads...");
}
public void downloadProgress (int percent, long remaining) {
Log.info("Download progress " + percent + "% " +
remaining + "s remaining.");
if (percent == 100) {
synchronized (lock) {
lock.notify();
}
}
}
public void downloadFailed (Resource rsrc, Exception e) {
Log.warning("Download failed [rsrc=" + rsrc + "].");
Log.logStackTrace(e);
synchronized (lock) {
lock.notify();
}
}
};
Downloader dl = new Downloader(resources, obs);
dl.start();
// now wait for it to complete
synchronized (lock) {
try {
lock.wait();
} catch (InterruptedException ie) {
Log.warning("Waitus interruptus " + ie + ".");
}
}
}
/**
* Called to launch the application if everything is determined to be
* ready to go.
*/
protected void launch ()
{
Log.info("All systems go!");
try {
Process proc = _app.createProcess();
} catch (IOException ioe) {
Log.logStackTrace(ioe);
}
}
public static void main (String[] args)
{
// ensure the proper parameters are passed
@@ -85,4 +161,6 @@ public class Getdown
}
protected Application _app;
protected static final int MAX_LOOPS = 5;
}