/*
* File : FMFileImpl.java
* Created : 12-Feb-2004
* By : parg
*
* Azureus - a Java Bittorrent client
*
* 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.
*
* 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 ( see the LICENSE file ).
* 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
*/
package com.aelitis.azureus.core.diskmanager.file.impl;
/**
* @author parg
*
*/
import java.util.*;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.torrent.TOTorrentFile;
import org.gudy.azureus2.core3.util.*;
import com.aelitis.azureus.core.diskmanager.file.*;
public abstract class
FMFileImpl
implements FMFile
{
protected static final String READ_ACCESS_MODE = "r";
protected static final String WRITE_ACCESS_MODE = "rwd";
private static Map file_map = new HashMap();
private static AEMonitor file_map_mon = new AEMonitor( "FMFile:map");
static{
AEDiagnostics.addEvidenceGenerator(
new AEDiagnosticsEvidenceGenerator()
{
public void
generate(
IndentWriter writer )
{
generateEvidence( writer );
}
});
}
private FMFileManagerImpl manager;
private FMFileOwner owner;
private int access_mode = FM_READ;
private File linked_file;
private String canonical_path;
private RandomAccessFile raf;
private FMFileAccessController file_access;
private File created_dirs_leaf;
private List created_dirs;
protected AEMonitor this_mon = new AEMonitor( "FMFile" );
protected
FMFileImpl(
FMFileOwner _owner,
FMFileManagerImpl _manager,
File _file,
int _type )
throws FMFileManagerException
{
owner = _owner;
manager = _manager;
linked_file = manager.getFileLink( owner.getTorrentFile().getTorrent(), _file );
boolean file_was_created = false;
boolean file_reserved = false;
boolean ok = false;
try{
try {
canonical_path = linked_file.getCanonicalPath();
}catch( IOException ioe ) {
String msg = ioe.getMessage();
if( msg != null && msg.indexOf( "There are no more files" ) != -1 ) {
String abs_path = linked_file.getAbsolutePath();
String error = "Caught 'There are no more files' exception during file.getCanonicalPath(). " +
"os=[" +Constants.OSName+ "], file.getPath()=[" +linked_file.getPath()+ "], file.getAbsolutePath()=[" +abs_path+ "]. ";
Debug.out( error, ioe );
}
throw ioe;
}
createDirs( linked_file );
reserveFile();
file_reserved = true;
file_access = new FMFileAccessController( this, _type );
ok = true;
}catch( Throwable e ){
if ( file_was_created ){
linked_file.delete();
}
deleteDirs();
if ( e instanceof FMFileManagerException ){
throw((FMFileManagerException)e);
}
throw( new FMFileManagerException( "initialisation failed", e ));
}finally{
if ( file_reserved && !ok ){
releaseFile();
}
}
}
protected FMFileManagerImpl
getManager()
{
return( manager );
}
public String
getName()
{
return( linked_file.toString());
}
public boolean
exists()
{
return( linked_file.exists());
}
public FMFileOwner
getOwner()
{
return( owner );
}
public void
setStorageType(
int new_type )
throws FMFileManagerException
{
try{
this_mon.enter();
boolean was_open = isOpen();
if ( was_open ){
closeSupport( false );
}
try{
file_access.setStorageType( new_type );
}finally{
if ( was_open ){
openSupport( "Re-open after storage type change" );
}
}
}finally{
this_mon.exit();
}
}
public int
getStorageType()
{
return( file_access.getStorageType());
}
public int
getAccessMode()
{
return( access_mode );
}
protected void
setAccessModeSupport(
int mode )
{
access_mode = mode;
}
protected File
getLinkedFile()
{
return( linked_file );
}
public void
moveFile(
File new_unlinked_file )
throws FMFileManagerException
{
try{
this_mon.enter();
String new_canonical_path;
File new_linked_file = manager.getFileLink( owner.getTorrentFile().getTorrent(), new_unlinked_file );
try{
try {
new_canonical_path = new_linked_file.getCanonicalPath();
}catch( IOException ioe ) {
String msg = ioe.getMessage();
if( msg != null && msg.indexOf( "There are no more files" ) != -1 ) {
String abs_path = new_linked_file.getAbsolutePath();
String error = "Caught 'There are no more files' exception during new_file.getCanonicalPath(). " +
"os=[" +Constants.OSName+ "], new_file.getPath()=[" +new_linked_file.getPath()+ "], new_file.getAbsolutePath()=[" +abs_path+ "]. ";
//"new_canonical_path temporarily set to [" +abs_path+ "]";
Debug.out( error, ioe );
}
throw ioe;
}
}catch( Throwable e ){
throw( new FMFileManagerException( "getCanonicalPath fails", e ));
}
if ( new_linked_file.exists()){
throw( new FMFileManagerException( "moveFile fails - file '" + new_canonical_path + "' already exists"));
}
boolean was_open = isOpen();
close(); // full close, this will release any slots in the limited file case
createDirs( new_linked_file );
if ( FileUtil.renameFile( linked_file, new_linked_file )) {
linked_file = new_linked_file;
canonical_path = new_canonical_path;
reserveFile();
if ( was_open ){
ensureOpen( "moveFile target" ); // ensure open will regain slots in limited file case
}
}else{
try{
reserveFile();
}catch( FMFileManagerException e ){
Debug.printStackTrace( e );
}
if ( was_open ){
try{
ensureOpen( "moveFile recovery" );
}catch( FMFileManagerException e){
Debug.printStackTrace( e );
}
}
throw( new FMFileManagerException( "moveFile fails"));
}
}finally{
this_mon.exit();
}
}
public void
ensureOpen(
String reason )
throws FMFileManagerException
{
try{
this_mon.enter();
if ( isOpen()){
return;
}
openSupport( reason );
}finally{
this_mon.exit();
}
}
protected long
getLengthSupport()
throws FMFileManagerException
{
return( file_access.getLength( raf ));
}
protected void
setLengthSupport(
long length )
throws FMFileManagerException
{
file_access.setLength( raf, length );
}
protected void
openSupport(
String reason )
throws FMFileManagerException
{
if ( raf != null ){
throw( new FMFileManagerException( "file already open" ));
}
reserveAccess( reason );
try{
raf = new RandomAccessFile( linked_file, access_mode==FM_READ?READ_ACCESS_MODE:WRITE_ACCESS_MODE);
}catch( Throwable e ){
Debug.printStackTrace( e );
throw( new FMFileManagerException( "open fails", e ));
}
}
protected void
closeSupport(
boolean explicit )
throws FMFileManagerException
{
FMFileManagerException flush_exception = null;
try{
flush();
}catch( FMFileManagerException e ){
flush_exception = e;
}
if ( raf == null ){
// may have previously been implicitly closed, tidy up if required
if ( explicit ){
releaseFile();
deleteDirs();
}
}else{
try{
raf.close();
}catch( Throwable e ){
throw( new FMFileManagerException("close fails", e ));
}finally{
raf = null;
if ( explicit ){
releaseFile();
}
}
}
if ( flush_exception != null ){
throw( flush_exception );
}
}
public void
flush()
throws FMFileManagerException
{
file_access.flush();
}
public void
delete()
throws FMFileManagerException
{
close();
if ( linked_file.exists()){
if ( !linked_file.delete()){
throw( new FMFileManagerException( "Failed to delete '" + linked_file + "'" ));
}
}
}
protected void
readSupport(
DirectByteBuffer buffer,
long position )
throws FMFileManagerException
{
readSupport(new DirectByteBuffer[]{buffer}, position );
}
protected void
readSupport(
DirectByteBuffer[] buffers,
long position )
throws FMFileManagerException
{
file_access.read( raf, buffers, position );
}
protected void
writeSupport(
DirectByteBuffer buffer,
long position )
throws FMFileManagerException
{
writeSupport(new DirectByteBuffer[]{buffer}, position );
}
protected void
writeSupport(
DirectByteBuffer[] buffers,
long position )
throws FMFileManagerException
{
file_access.write( raf, buffers, position );
}
public boolean
isOpen()
{
return( raf != null );
}
// file reservation is used to manage the possibility of multiple torrents
// refering to the same file. Initially introduced to stop a common problem
// whereby different torrents contain the same files - without
// this code the torrents could interfere resulting in all sorts of problems
// The original behavior was to completely prevent the sharing of files.
// However, better behaviour is to allow sharing of a file as long as only
// read access is required.
// we store a list of owners against each canonical file with a boolean "write" marker
private void
reserveFile()
throws FMFileManagerException
{
try{
file_map_mon.enter();
// System.out.println( "FMFile::reserveFile:" + canonical_path + "("+ owner.getName() + ")" );
List owners = (List)file_map.get(canonical_path);
if ( owners == null ){
owners = new ArrayList();
file_map.put( canonical_path, owners );
}
for (Iterator it=owners.iterator();it.hasNext();){
Object[] entry = (Object[])it.next();
if ( owner.getName().equals(((FMFileOwner)entry[0]).getName())){
// already present, start off read-access
Debug.out( "reserve file - entry already present" );
entry[1] = new Boolean( false );
return;
}
}
owners.add( new Object[]{ owner, new Boolean( false ), "<reservation>" });
}finally{
file_map_mon.exit();
}
}
private void
reserveAccess(
String reason )
throws FMFileManagerException
{
try{
file_map_mon.enter();
// System.out.println( "FMFile::reserveAccess:" + canonical_path + "("+ owner.getName() + ")" + " [" + (access_mode==FM_WRITE?"write":"read") + "]" );
List owners = (List)file_map.get( canonical_path );
Object[] my_entry = null;
if ( owners == null ){
Debug.out( "reserveAccess fail" );
throw( new FMFileManagerException( "File '"+canonical_path+"' has not been reserved (no entries), '" + owner.getName()+"'"));
}
for (Iterator it=owners.iterator();it.hasNext();){
Object[] entry = (Object[])it.next();
if ( owner.getName().equals(((FMFileOwner)entry[0]).getName())){
my_entry = entry;
}
}
if ( my_entry == null ){
Debug.out( "reserveAccess fail" );
throw( new FMFileManagerException( "File '"+canonical_path+"' has not been reserved (not found), '" + owner.getName()+"'"));
}
my_entry[1] = new Boolean( access_mode==FM_WRITE );
my_entry[2] = reason;
int read_access = 0;
int write_access = 0;
int write_access_lax = 0;
TOTorrentFile my_torrent_file = owner.getTorrentFile();
String users = "";
for (Iterator it=owners.iterator();it.hasNext();){
Object[] entry = (Object[])it.next();
FMFileOwner this_owner = (FMFileOwner)entry[0];
if (((Boolean)entry[1]).booleanValue()){
write_access++;
TOTorrentFile this_tf = this_owner.getTorrentFile();
if ( my_torrent_file != null && this_tf != null && my_torrent_file.getLength() == this_tf.getLength()){
write_access_lax++;
}
users += (users.length()==0?"":",") + this_owner.getName() + " [write]";
}else{
read_access++;
users += (users.length()==0?"":",") + this_owner.getName() + " [read]";
}
}
if ( write_access > 1 ||
( write_access == 1 && read_access > 0 )){
// relax locking if strict is disabled and torrent file is same size
if ( !COConfigurationManager.getBooleanParameter( "File.strict.locking" )){
if ( write_access_lax == write_access ){
return;
}
}
Debug.out( "reserveAccess fail" );
throw( new FMFileManagerException( "File '"+canonical_path+"' is in use by '" + users +"'"));
}
}finally{
file_map_mon.exit();
}
}
private void
releaseFile()
{
try{
file_map_mon.enter();
// System.out.println( "FMFile::releaseFile:" + canonical_path + "("+ owner.getName() + ")" );
List owners = (List)file_map.get( canonical_path );
if ( owners != null ){
for (Iterator it=owners.iterator();it.hasNext();){
Object[] entry = (Object[])it.next();
if ( owner.getName().equals(((FMFileOwner)entry[0]).getName())){
it.remove();
break;
}
}
if ( owners.size() == 0 ){
file_map.remove( canonical_path );
}
}
}finally{
file_map_mon.exit();
}
}
protected void
createDirs(
File target )
throws FMFileManagerException
{
deleteDirs();
File parent = target.getParentFile();
if ( !parent.exists()){
List new_dirs = new ArrayList();
File current = parent;
while( current != null && !current.exists()){
new_dirs.add( current );
current = current.getParentFile();
}
created_dirs_leaf = target;
created_dirs = new ArrayList();
if (FileUtil.mkdirs(parent)){
created_dirs_leaf = target;
created_dirs = new_dirs;
/*
for (int i=created_dirs.size()-1;i>=0;i--){
System.out.println( "created " + created_dirs.get(i));
}
*/
}else{
throw( new FMFileManagerException( "Failed to create parent directory '" + parent + "'"));
}
}
}
protected void
deleteDirs()
{
if ( created_dirs_leaf != null ){
// delete any dirs we created if the target file doesn't exist
if ( !created_dirs_leaf.exists()){
Iterator it = created_dirs.iterator();
while( it.hasNext()){
File dir = (File)it.next();
if ( dir.exists() && dir.isDirectory()){
File[] entries = dir.listFiles();
if ( entries == null || entries.length == 0 ){
// System.out.println( "deleted " + dir );
dir.delete();
}else{
break;
}
}else{
break;
}
}
}
created_dirs_leaf = null;
created_dirs = null;
}
}
protected String
getString()
{
File cPath = new File(canonical_path);
String sPaths;
if (cPath.equals(linked_file))
sPaths = "can/link=" + Debug.secretFileName(canonical_path);
else
sPaths = "can=" + Debug.secretFileName(canonical_path) + ",link="
+ Debug.secretFileName(linked_file.toString());
return sPaths + ",raf=" + raf + ",acc=" + access_mode + ",ctrl = "
+ file_access.getString();
}
protected static void
generateEvidence(
IndentWriter writer )
{
writer.println( file_map.size() + " FMFile Reservations" );
try{
writer.indent();
try{
file_map_mon.enter();
Iterator it = file_map.keySet().iterator();
while( it.hasNext()){
String key = (String)it.next();
List owners = (List)file_map.get(key);
Iterator it2 = owners.iterator();
String str = "";
while( it2.hasNext()){
Object[] entry = (Object[])it2.next();
FMFileOwner owner = (FMFileOwner)entry[0];
Boolean write = (Boolean)entry[1];
String reason = (String)entry[2];
str += (str.length()==0?"":", ") + owner.getName() + "[" + (write.booleanValue()?"write":"read")+ "/" + reason + "]";
}
writer.println( Debug.secretFileName(key) + " -> " + str );
}
}finally{
file_map_mon.exit();
}
FMFileManagerImpl.generateEvidence( writer );
}finally{
writer.exdent();
}
}
}
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