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Pure Java implementation of libzmq
package zmq;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
public interface Transfer
{
public int transferTo(WritableByteChannel s) throws IOException;
public int remaining();
public static class ByteBufferTransfer implements Transfer
{
private ByteBuffer buf;
public ByteBufferTransfer(ByteBuffer buf)
{
this.buf = buf;
}
@Override
public final int transferTo(WritableByteChannel s) throws IOException
{
return s.write(buf);
}
@Override
public final int remaining()
{
return buf.remaining();
}
}
public static class FileChannelTransfer implements Transfer
{
private Transfer parent;
private FileChannel channel;
private long position;
private long count;
private int remaining;
public FileChannelTransfer(ByteBuffer buf, FileChannel channel, long position, long count)
{
parent = new ByteBufferTransfer(buf);
this.channel = channel;
this.position = position;
this.count = count;
remaining = parent.remaining() + (int) this.count;
}
@Override
public final int transferTo(WritableByteChannel s) throws IOException
{
int sent = 0;
if (parent.remaining() > 0) {
sent = parent.transferTo(s);
}
if (parent.remaining() == 0) {
long fileSent = channel.transferTo(position, count, s);
position += fileSent;
count -= fileSent;
sent += fileSent;
}
remaining -= sent;
if (remaining == 0) {
channel.close();
}
return sent;
}
@Override
public final int remaining()
{
return remaining;
}
}
}
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