package io.eguan.nbdsrv.client;
/*
* #%L
* Project eguan
* %%
* Copyright (C) 2012 - 2017 Oodrive
* %%
* 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.
* #L%
*/
import io.eguan.nbdsrv.packet.DataPushingCmd;
import io.eguan.nbdsrv.packet.DataPushingPacket;
import io.eguan.nbdsrv.packet.DataPushingReplyPacket;
import io.eguan.nbdsrv.packet.NbdException;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TrimTask extends TaskAbstract {
/** NBD client */
private final NbdClient client;
/** Position of the first byte to trim */
private final long offset;
/** Number of bytes to trim */
private final int length;
private static final Logger LOGGER = LoggerFactory.getLogger(TrimTask.class);
TrimTask(final NbdClient connection, final long offset, final int length) {
super();
this.client = connection;
this.offset = offset;
this.length = length;
}
@Override
public final Boolean call() throws IOException, NbdException {
// Send write request
final DataPushingPacket dataPushingPacket = new DataPushingPacket(DataPushingPacket.MAGIC,
DataPushingCmd.NBD_CMD_TRIM, getHandle(), offset, length);
final ByteBuffer header = DataPushingPacket.serialize(dataPushingPacket);
try {
client.writeSocket(header);
}
finally {
DataPushingPacket.release(header);
}
// Wait Answer
LOGGER.debug("Read Data Pushing Reply");
final ByteBuffer dst = DataPushingReplyPacket.allocateHeader();
try {
client.readSocket(dst);
// TODO : check the handle
DataPushingReplyPacket.deserialize(dst);
}
finally {
DataPushingReplyPacket.release(dst);
}
return true;
}
}