/*
* This file is part of the Haven & Hearth game client.
* Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
* Björn Johannessen <johannessen.bjorn@gmail.com>
*
* Redistribution and/or modification of this file is subject to the
* terms of the GNU Lesser General Public License, version 3, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Other parts of this source tree adhere to other copying
* rights. Please see the file `COPYING' in the root directory of the
* source tree for details.
*
* A copy the GNU Lesser General Public License is distributed along
* with the source tree of which this file is a part in the file
* `doc/LPGL-3'. If it is missing for any reason, please see the Free
* Software Foundation's website at <http://www.fsf.org/>, or write
* to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
package haven;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URL;
import javax.jnlp.BasicService;
import javax.jnlp.FileContents;
import javax.jnlp.PersistenceService;
import javax.jnlp.ServiceManager;
public class JnlpCache implements ResCache {
private PersistenceService back;
private URL base;
private JnlpCache(PersistenceService back, URL base) {
this.back = back;
this.base = base;
}
public static JnlpCache create() {
try {
Class<? extends ServiceManager> cl = Class.forName("javax.jnlp.ServiceManager").asSubclass(ServiceManager.class);
Method m = cl.getMethod("lookup", String.class);
BasicService basic = (BasicService)m.invoke(null, "javax.jnlp.BasicService");
PersistenceService prs = (PersistenceService)m.invoke(null, "javax.jnlp.PersistenceService");
return(new JnlpCache(prs, basic.getCodeBase()));
} catch(Exception e) {
return(null);
}
}
private static String mangle(String nm) {
StringBuilder buf = new StringBuilder();
for(int i = 0; i < nm.length(); i++) {
char c = nm.charAt(i);
if(c == '/')
buf.append("_");
else
buf.append(c);
}
return(buf.toString());
}
private void realput(URL loc, byte[] data) {
FileContents file;
try {
try {
file = back.get(loc);
} catch(FileNotFoundException e) {
back.create(loc, data.length);
file = back.get(loc);
}
if(file.getMaxLength() < data.length) {
if(file.setMaxLength(data.length) < data.length) {
back.delete(loc);
return;
}
}
OutputStream s = file.getOutputStream(true);
try {
s.write(data);
} finally {
s.close();
}
} catch(IOException e) {
return;
} catch(Exception e) {
/* There seems to be a strange bug in NetX. */
return;
}
}
private void put(final URL loc, final byte[] data) {
/*
* Interestingly enough, it seems that the JNLP persistence
* cache, at least in Sun's implementation, is REALLY
* SLOW. "Really slow" meaning that it takes like 1 second to
* save each muffin. How they managed to do this, I have no
* clue, but to counter it, so as to not take up precious
* resource/minimap loader time, the actual storage is
* deferred.
*
* Sucks? You don't say.
*/
Utils.defer(new Runnable() {
public void run() {
realput(loc, data);
}
});
}
private InputStream get(URL loc) throws IOException {
FileContents file = back.get(loc);
return(file.getInputStream());
}
public OutputStream store(final String name) throws IOException {
/*
* The persistence service actually yields a real
* OutputStream, but since it needs to know the final size of
* the data before that, it isn't actually possible to use it
* as an OutputStream in any reasonable manner. Thus, all data
* is first "pre-cached" in a ByteArrayOutputStream, and then
* written to the persistence store.
*
* Oh God, it's so stupid.
*/
OutputStream ret = new ByteArrayOutputStream() {
public void close() {
byte[] res = toByteArray();
try {
put(new URL(base, mangle(name)), res);
} catch(java.net.MalformedURLException e) {
throw(new RuntimeException(e));
}
}
};
return(ret);
}
public InputStream fetch(String name) throws IOException {
try {
URL loc = new URL(base, mangle(name));
return(get(loc));
} catch(IOException e) {
throw(e);
} catch(Exception e) {
/* There seems to be a weird bug in NetX */
throw((IOException)(new IOException("Virtual NetX IO exception").initCause(e)));
}
}
}