/*
* Copyright 1999-2006 University of Chicago
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.dcache.ftp.client.dc;
import java.io.DataOutputStream;
import java.io.OutputStream;
import java.io.IOException;
import org.dcache.ftp.client.Buffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class EBlockImageDCWriter
extends EBlockAware
implements DataChannelWriter
{
static final Logger logger = LoggerFactory.getLogger(EBlockImageDCWriter.class);
protected DataOutputStream output;
@Override
public void setDataStream(OutputStream out)
{
output = new DataOutputStream(out);
}
@Override
public void write(Buffer buf)
throws IOException
{
long offset = buf.getOffset();
if (offset < 0) {
throw new IOException("Invalid offset: " + offset);
}
output.writeByte(0);
logger.debug("buffer length: " + buf.getLength());
output.writeLong(buf.getLength());
logger.debug("offset: " + offset);
output.writeLong(offset);
output.write(buf.getBuffer(), 0, buf.getLength());
//output.flush();
logger.debug("wrote the buffer");
}
@Override
public void endOfData() throws IOException
{
byte desc;
//the first data channel to quit
// will send EOF. There musn't be more than
// 1 EOF per stripe.
synchronized (context) {
if (context.eodsTransferred == 0) {
desc = EOF | EOD;
output.writeByte(desc);
output.writeLong(0);
output.writeLong(context.eodsTotal);
logger.debug("wrote EOF (expected EODS: "
+ context.eodsTotal + ") and EOD");
} else {
desc = EOD;
output.writeByte(desc);
output.writeLong(0);
output.writeLong(0);
logger.debug("wrote EOD");
}
context.eodTransferred();
}
// important to flush, otherwise transfer will hang
// with data and EOD remaining in the output buffer
output.flush();
}
public static void close(DataOutputStream myOutput)
throws IOException
{
byte desc;
// EOF and EOD have already been sent
desc = WILL_CLOSE;
myOutput.writeByte(desc);
myOutput.writeLong(0);
myOutput.writeLong(0);
logger.debug("Wrote WILL_CLOSE, closing the socket");
// close the socket
myOutput.close();
}
@Override
public void close() throws IOException
{
close(output);
}
}