package org.wildfly.swarm.monitor.runtime;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.AbstractStreamSinkConduit;
import org.xnio.conduits.ConduitWritableByteChannel;
import org.xnio.conduits.Conduits;
import org.xnio.conduits.StreamSinkConduit;
/**
* Conduit that saves all the data that is written through it
*
* @author Heiko Braun
*/
public class BufferingSinkConduit extends AbstractStreamSinkConduit<StreamSinkConduit> {
private final List<byte[]> data = new CopyOnWriteArrayList<>();
/**
* Construct a new instance.
*
* @param next the delegate conduit to set
*/
public BufferingSinkConduit(StreamSinkConduit next) {
super(next);
}
@Override
public int write(ByteBuffer src) throws IOException {
int pos = src.position();
int res = super.write(src);
if (res > 0) {
byte[] d = new byte[res];
for (int i = 0; i < res; ++i) {
d[i] = src.get(i + pos);
}
data.add(d);
}
return res;
}
@Override
public long write(ByteBuffer[] dsts, int offs, int len) throws IOException {
for (int i = offs; i < len; ++i) {
if (dsts[i].hasRemaining()) {
return write(dsts[i]);
}
}
return 0;
}
@Override
public long transferFrom(final FileChannel src, final long position, final long count) throws IOException {
return src.transferTo(position, count, new ConduitWritableByteChannel(this));
}
@Override
public long transferFrom(final StreamSourceChannel source, final long count, final ByteBuffer throughBuffer) throws IOException {
return IoUtils.transfer(source, count, throughBuffer, new ConduitWritableByteChannel(this));
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
return Conduits.writeFinalBasic(this, src);
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
return Conduits.writeFinalBasic(this, srcs, offset, length);
}
@Override
public void terminateWrites() throws IOException {
super.terminateWrites();
data.clear();
}
public void flushTo(StringBuffer sb) {
if (!data.isEmpty()) {
for (int i = 0; i < data.size(); ++i) {
try {
sb.append(new String(data.get(i), "UTF-8")); // TODO retrieve the encoding from the http response headers
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
}