jcifs.smb.SmbFileHandleImpl Maven / Gradle / Ivy
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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
/*
* © 2017 AgNO3 Gmbh & Co. KG
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package jcifs.smb;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicLong;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import jcifs.CIFSException;
import jcifs.Configuration;
import jcifs.SmbFileHandle;
import jcifs.internal.smb1.com.SmbComBlankResponse;
import jcifs.internal.smb1.com.SmbComClose;
import jcifs.internal.smb2.create.Smb2CloseRequest;
import jcifs.util.Hexdump;
/**
* @author mbechler
*
*/
class SmbFileHandleImpl implements SmbFileHandle {
private static final Logger log = LoggerFactory.getLogger(SmbFileHandleImpl.class);
private final Configuration cfg;
private final int fid;
private final byte[] fileId;
private boolean open = true;
private final long tree_num; // for checking whether the tree changed
private SmbTreeHandleImpl tree;
private final AtomicLong usageCount = new AtomicLong(1);
private final int flags;
private final int access;
private final int attrs;
private final int options;
private final String unc;
private final StackTraceElement[] creationBacktrace;
private long initialSize;
/**
* @param cfg
* @param fid
* @param tree
* @param unc
* @param options
* @param attrs
* @param access
* @param flags
* @param initialSize
*/
public SmbFileHandleImpl ( Configuration cfg, byte[] fid, SmbTreeHandleImpl tree, String unc, int flags, int access, int attrs, int options,
long initialSize ) {
this.cfg = cfg;
this.fileId = fid;
this.initialSize = initialSize;
this.fid = 0;
this.unc = unc;
this.flags = flags;
this.access = access;
this.attrs = attrs;
this.options = options;
this.tree = tree.acquire();
this.tree_num = tree.getTreeId();
if ( cfg.isTraceResourceUsage() ) {
this.creationBacktrace = Thread.currentThread().getStackTrace();
}
else {
this.creationBacktrace = null;
}
}
/**
* @param cfg
* @param fid
* @param tree
* @param unc
* @param options
* @param attrs
* @param access
* @param flags
* @param initialSize
*/
public SmbFileHandleImpl ( Configuration cfg, int fid, SmbTreeHandleImpl tree, String unc, int flags, int access, int attrs, int options,
long initialSize ) {
this.cfg = cfg;
this.fid = fid;
this.initialSize = initialSize;
this.fileId = null;
this.unc = unc;
this.flags = flags;
this.access = access;
this.attrs = attrs;
this.options = options;
this.tree = tree.acquire();
this.tree_num = tree.getTreeId();
if ( cfg.isTraceResourceUsage() ) {
this.creationBacktrace = Thread.currentThread().getStackTrace();
}
else {
this.creationBacktrace = null;
}
}
/**
* @return the fid
* @throws SmbException
*/
public int getFid () throws SmbException {
if ( !isValid() ) {
throw new SmbException("Descriptor is no longer valid");
}
return this.fid;
}
public byte[] getFileId () throws SmbException {
if ( !isValid() ) {
throw new SmbException("Descriptor is no longer valid");
}
return this.fileId;
}
/**
* @return the initialSize
*/
@Override
public long getInitialSize () {
return this.initialSize;
}
/**
* {@inheritDoc}
*
* @see jcifs.SmbFileHandle#getTree()
*/
@Override
public SmbTreeHandleImpl getTree () {
return this.tree.acquire();
}
/**
* {@inheritDoc}
*
* @see jcifs.SmbFileHandle#isValid()
*/
@Override
public boolean isValid () {
return this.open && this.tree_num == this.tree.getTreeId() && this.tree.isConnected();
}
/**
* {@inheritDoc}
*
* @see jcifs.SmbFileHandle#close(long)
*/
@Override
public synchronized void close ( long lastWriteTime ) throws CIFSException {
closeInternal(lastWriteTime, true);
}
/**
* @param lastWriteTime
* @throws SmbException
*/
void closeInternal ( long lastWriteTime, boolean explicit ) throws CIFSException {
SmbTreeHandleImpl t = this.tree;
try {
if ( t != null && isValid() ) {
if ( log.isDebugEnabled() ) {
log.debug("Closing file handle " + this);
}
if ( t.isSMB2() ) {
Smb2CloseRequest req = new Smb2CloseRequest(this.cfg, this.fileId);
t.send(req, RequestParam.NO_RETRY);
}
else {
t.send(new SmbComClose(this.cfg, this.fid, lastWriteTime), new SmbComBlankResponse(this.cfg), RequestParam.NO_RETRY);
}
}
}
finally {
this.open = false;
if ( t != null ) {
// release tree usage
t.release();
}
this.tree = null;
}
}
/**
* {@inheritDoc}
*
* @see jcifs.SmbFileHandle#close()
*/
@Override
public void close () throws CIFSException {
release();
}
/**
* {@inheritDoc}
*
* @throws SmbException
*
* @see jcifs.SmbFileHandle#release()
*/
@Override
public synchronized void release () throws CIFSException {
long usage = this.usageCount.decrementAndGet();
if ( usage == 0 ) {
closeInternal(0L, false);
}
else if ( log.isTraceEnabled() ) {
log.trace(String.format("Release %s (%d)", this, usage));
}
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#finalize()
*/
@Override
protected void finalize () throws Throwable {
if ( this.usageCount.get() != 0 && this.open ) {
log.warn("File handle was not properly closed: " + this);
if ( this.creationBacktrace != null ) {
log.warn(Arrays.toString(this.creationBacktrace));
}
}
}
/**
* @return a file handle with increased usage count
*/
public SmbFileHandleImpl acquire () {
long usage = this.usageCount.incrementAndGet();
if ( log.isTraceEnabled() ) {
log.trace(String.format("Acquire %s (%d)", this, usage));
}
return this;
}
/**
*
*/
public void markClosed () {
this.open = false;
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#toString()
*/
@Override
public String toString () {
return String.format(
"FileHandle %s [fid=%s,tree=%d,flags=%x,access=%x,attrs=%x,options=%x]",
this.unc,
this.fileId != null ? Hexdump.toHexString(this.fileId) : this.fid,
this.tree_num,
this.flags,
this.access,
this.attrs,
this.options);
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode () {
if ( this.fileId != null ) {
return (int) ( Arrays.hashCode(this.fileId) + 3 * this.tree_num );
}
return (int) ( this.fid + 3 * this.tree_num );
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals ( Object obj ) {
if ( ! ( obj instanceof SmbFileHandleImpl ) ) {
return false;
}
SmbFileHandleImpl o = (SmbFileHandleImpl) obj;
if ( this.fileId != null ) {
return Arrays.equals(this.fileId, o.fileId) && this.tree_num == o.tree_num;
}
return this.fid == o.fid && this.tree_num == o.tree_num;
}
}
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