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package org.openslx.filetransfer.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import org.apache.log4j.Logger;
public class HashChecker
{
private static final Logger LOGGER = Logger.getLogger( HashChecker.class );
private final BlockingQueue<HashTask> queue = new LinkedBlockingQueue<>( 10 );
private final List<Thread> threads = new ArrayList<>();
private final String algorithm;
private volatile boolean invalid = false;
public HashChecker( String algorithm ) throws NoSuchAlgorithmException
{
this.algorithm = algorithm;
CheckThread thread = new CheckThread( false );
thread.start();
threads.add( thread );
}
private void threadFailed( CheckThread thread )
{
synchronized ( threads ) {
if ( thread.extraThread )
return;
invalid = true;
}
for ( ;; ) {
HashTask task = queue.poll();
if ( task == null )
break;
execCallback( task, HashResult.FAILURE );
}
}
@Override
protected void finalize()
{
try {
synchronized ( threads ) {
for ( Thread t : threads ) {
t.interrupt();
}
}
} catch ( Throwable t ) {
LOGGER.warn( "Something threw in finalize", t );
}
}
private void execCallback( HashTask task, HashResult result )
{
task.callback.hashCheckDone( result, task.data, task.chunk );
}
public void queue( FileChunk chunk, byte[] data, HashCheckCallback callback ) throws InterruptedException
{
byte[] sha1Sum = chunk.getSha1Sum();
if ( sha1Sum == null )
throw new NullPointerException( "Chunk has no sha1 hash" );
HashTask task = new HashTask( data, chunk, callback );
synchronized ( threads ) {
if ( invalid ) {
execCallback( task, HashResult.FAILURE );
return;
}
if ( queue.remainingCapacity() <= 1 && threads.size() < Runtime.getRuntime().availableProcessors() ) {
try {
CheckThread thread = new CheckThread( true );
thread.start();
threads.add( thread );
} catch ( Exception e ) {
LOGGER.warn( "Could not create additional hash checking thread", e );
}
}
queue.put( task );
}
}
// ############################################################# \\
private class CheckThread extends Thread
{
private final MessageDigest md;
private final boolean extraThread;
/**
* Worker thread doing the sha1 calculations and comparison
*
* @param isExtra whether this is an extra thread that should be shut down when the queue is
* empty again.
* @throws NoSuchAlgorithmException
*/
public CheckThread( boolean isExtra ) throws NoSuchAlgorithmException
{
super( "HashCheck" );
md = MessageDigest.getInstance( algorithm );
extraThread = isExtra;
}
@Override
public void run()
{
while ( !interrupted() ) {
HashTask task;
// Wait for work
try {
task = queue.take();
if ( task == null )
continue;
} catch ( InterruptedException e ) {
LOGGER.info( "Interrupted while waiting for hash task", e );
threadFailed( this );
break;
}
// Calculate digest
md.update( task.data, 0, task.chunk.range.getLength() );
byte[] digest = md.digest();
HashResult result = Arrays.equals( digest, task.chunk.getSha1Sum() ) ? HashResult.VALID : HashResult.INVALID;
execCallback( task, result );
if ( extraThread && queue.isEmpty() ) {
LOGGER.info( "Stopping additional hash checker" );
break;
}
}
}
}
public static enum HashResult
{
VALID, // Hash matches
INVALID, // Hash does not match
FAILURE // Error calculating hash
}
private static class HashTask
{
public final byte[] data;
public final FileChunk chunk;
public final HashCheckCallback callback;
public HashTask( byte[] data, FileChunk chunk, HashCheckCallback callback )
{
this.data = data;
this.chunk = chunk;
this.callback = callback;
chunk.setStatus( ChunkStatus.HASHING );
}
}
public static interface HashCheckCallback
{
public void hashCheckDone( HashResult result, byte[] data, FileChunk chunk );
}
}
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