/*
* Created on 25-Apr-2004
* Created by Paul Gardner
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* 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.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package org.gudy.azureus2.pluginsimpl.local.utils.resourcedownloader;
/**
* @author parg
*
*/
import java.io.*;
import java.util.*;
import org.gudy.azureus2.core3.util.*;
import org.gudy.azureus2.plugins.utils.resourcedownloader.*;
public class
ResourceDownloaderAlternateImpl
extends ResourceDownloaderBaseImpl
implements ResourceDownloaderListener
{
protected ResourceDownloader[] delegates;
protected int max_to_try;
protected boolean random;
protected boolean cancelled;
protected ResourceDownloader current_downloader;
protected int current_index;
protected Object result;
protected AESemaphore done_sem = new AESemaphore("RDAlternate");
protected long size = -2;
public
ResourceDownloaderAlternateImpl(
ResourceDownloaderBaseImpl _parent,
ResourceDownloader[] _delegates,
int _max_to_try,
boolean _random )
{
super( _parent );
delegates = _delegates;
max_to_try = _max_to_try;
random = _random;
for (int i=0;i<delegates.length;i++){
((ResourceDownloaderBaseImpl)delegates[i]).setParent( this );
}
if ( max_to_try < 0 ){
max_to_try = delegates.length;
}else{
max_to_try = Math.min( max_to_try, delegates.length );
}
if ( random ){
List l = new ArrayList(Arrays.asList( delegates ));
delegates = new ResourceDownloader[delegates.length];
for (int i=0;i<delegates.length;i++){
delegates[i] = (ResourceDownloader)l.remove((int)(Math.random()*l.size()));
}
}
}
public String
getName()
{
String res = "[";
for (int i=0;i<delegates.length;i++){
res += (i==0?"":",") + delegates[i].getName();
}
return( res + "]");
}
public long
getSize()
throws ResourceDownloaderException
{
if( delegates.length == 0 ){
ResourceDownloaderException error = new ResourceDownloaderException( this, "Alternate download fails - 0 alteratives");
informFailed( error );
throw( error );
}
if ( size != -2 ){
return( size );
}
try{
for (int i=0;i<max_to_try;i++){
try{
ResourceDownloaderBaseImpl c = ((ResourceDownloaderBaseImpl)delegates[i]).getClone( this );
addReportListener( c );
size = c.getSize();
setProperties( c );
break;
}catch( ResourceDownloaderException e ){
if ( i == delegates.length-1 ){
throw( e );
}
}
}
}finally{
if ( size == -2 ){
size = -1;
}
setSize( size );
}
return( size );
}
protected void
setSize(
long l )
{
size = l;
if ( size >= 0 ){
for (int i=0;i<delegates.length;i++){
((ResourceDownloaderBaseImpl)delegates[i]).setSize( size );
}
}
}
public void
setProperty(
String name,
Object value )
throws ResourceDownloaderException
{
setPropertySupport( name, value );
for (int i=0;i<delegates.length;i++){
((ResourceDownloaderBaseImpl)delegates[i]).setProperty( name, value );
}
}
public ResourceDownloaderBaseImpl
getClone(
ResourceDownloaderBaseImpl parent )
{
ResourceDownloader[] clones = new ResourceDownloader[delegates.length];
for (int i=0;i<delegates.length;i++){
clones[i] = ((ResourceDownloaderBaseImpl)delegates[i]).getClone( this );
}
ResourceDownloaderAlternateImpl c =
new ResourceDownloaderAlternateImpl( parent, clones, max_to_try, random );
c.setSize(size);
c.setProperties( this );
return( c );
}
public InputStream
download()
throws ResourceDownloaderException
{
if( delegates.length == 0 ){
ResourceDownloaderException error = new ResourceDownloaderException( this, "Alternate download fails - 0 alteratives");
informFailed( error );
throw( error );
}
asyncDownload();
done_sem.reserve();
if ( result instanceof InputStream ){
return((InputStream)result);
}
throw((ResourceDownloaderException)result);
}
public void
asyncDownload()
{
try{
this_mon.enter();
if ( current_index == max_to_try || cancelled ){
done_sem.release();
informFailed((ResourceDownloaderException)result);
}else{
current_downloader = ((ResourceDownloaderBaseImpl)delegates[current_index]).getClone( this );
informActivity( getLogIndent() + "Downloading: " + getName());
current_index++;
current_downloader.addListener( this );
current_downloader.asyncDownload();
}
}finally{
this_mon.exit();
}
}
public void
cancel()
{
setCancelled();
try{
this_mon.enter();
result = new ResourceDownloaderCancelledException( this );
cancelled = true;
informFailed((ResourceDownloaderException)result );
done_sem.release();
if ( current_downloader != null ){
current_downloader.cancel();
}
}finally{
this_mon.exit();
}
}
public boolean
completed(
ResourceDownloader downloader,
InputStream data )
{
if ( informComplete( data )){
result = data;
done_sem.release();
return( true );
}
return( false );
}
public void
failed(
ResourceDownloader downloader,
ResourceDownloaderException e )
{
result = e;
asyncDownload();
}
}