org.voltdb.utils.PBDUtils Maven / Gradle / Ivy
/* This file is part of VoltDB.
* Copyright (C) 2008-2018 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltdb.utils;
import org.voltcore.utils.DeferredSerialization;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class PBDUtils {
public static int writeDeferredSerialization(ByteBuffer mbuf, DeferredSerialization ds) throws IOException
{
int written = 0;
try {
final int objSizePosition = mbuf.position();
mbuf.position(mbuf.position() + PBDSegment.OBJECT_HEADER_BYTES);
final int objStartPosition = mbuf.position();
ds.serialize(mbuf);
written = mbuf.position() - objStartPosition;
mbuf.putInt(objSizePosition, written);
mbuf.putInt(objSizePosition + 4, PBDSegment.NO_FLAGS);
} finally {
ds.cancel();
}
return written;
}
public static void writeBuffer(FileChannel fc, ByteBuffer buf, int startPos) throws IOException
{
int pos = startPos;
while (buf.hasRemaining()) {
pos += fc.write(buf, pos);
}
}
public static void readBufferFully(FileChannel fc, ByteBuffer buf, int startPos) throws IOException
{
int pos = startPos;
while (buf.hasRemaining()) {
int read = fc.read(buf, pos);
if (read == -1) {
throw new EOFException();
}
pos += read;
}
buf.flip();
}
}