/* examples for the jcifs smb client library in Java
* Copyright (C) 2000 "Michael B. Allen" <jcifs at samba dot org>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
import jcifs.smb.SmbFile;
import jcifs.util.*;
import java.util.LinkedList;
import java.util.ListIterator;
import java.net.MalformedURLException;
import java.io.IOException;
public class T2Crawler {
class Semaphore {
private int value = 0;
Semaphore() {value = 0;}
Semaphore(int initial) {value = initial;}
public synchronized void P() {
value--;
if (value < 0) {
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public synchronized void V() {
value++;
notify();
}
}
class CrawlerThread extends Thread {
LinkedList list;
Semaphore sem;
SmbFile dir;
int depth;
CrawlerThread( SmbFile dir, Semaphore sem, int depth ) {
this.dir = dir;
list = new LinkedList();
list.add( dir );
this.sem = sem;
this.depth = depth;
}
public void run() {
SmbFile d;
SmbFile l[];
while( list.isEmpty() == false ) {
int i;
d = (SmbFile)list.remove( 0 );
try {
l = d.listFiles();
/* This is flawed. It decrements depth too agressively and causes the
* thread to finish prematurely. I do not know of a way to fix this
* because there is no concept of a stack here.
*/
depth--;
for( i = 0; i < l.length; i++ ) {
System.out.println( l[i] );
// if( depth++ > 0 && l[i].isDirectory() && !l[i].isHidden() ) {
if( depth > 0 && l[i].isDirectory() ) {
list.add( l[i] );
}
}
} catch( Exception e ) {
System.out.println( d );
e.printStackTrace();
}
}
sem.V();
}
}
T2Crawler( String dir, int numThreads, int depth ) throws Exception {
SmbFile top = new SmbFile( dir );
Semaphore sem = new Semaphore( numThreads );
SmbFile[] l = null;
int i = 0;
try {
l = top.listFiles();
depth--;
for( i = 0; i < l.length; i++ ) {
try {
System.out.println( l[i] );
if( !l[i].isDirectory() || l[i].isHidden() ) {
continue;
}
if( depth > 0 ) {
sem.P();
(new CrawlerThread( l[i], sem, depth )).start();
}
} catch( Exception e ) {
e.printStackTrace();
}
}
for( i = 0; i < l.length; i++ ) {
try {
l[i].canRead();
} catch(Exception ex) {
System.err.println( l[i] );
ex.printStackTrace();
}
}
} catch( Exception ex ) {
System.err.println( l[i] );
ex.printStackTrace();
}
}
public static void main(String[] argv) throws Exception {
if( argv.length < 3) {
System.out.println( "$ java -Djcifs.properties=miallen.prp T2Crawler <dir> <num threads> <depth>");
System.exit(1);
}
new T2Crawler( argv[0], Integer.parseInt( argv[1] ), Integer.parseInt( argv[2] ));
}
}