package org.infinispan.rest.embedded.netty4;
import java.io.IOException;
import java.io.OutputStream;
import org.infinispan.rest.embedded.netty4.i18n.Messages;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultHttpContent;
/**
* Class to help application that are built to write to an
* OutputStream to chunk the content
* <p>
* <pre>
* {@code
* DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
* HttpHeaders.setTransferEncodingChunked(response);
* response.headers().set(CONTENT_TYPE, "application/octet-stream");
* //other headers
* ctx.write(response);
* // code of the application that use the ChunkOutputStream
* // Don't forget to close the ChunkOutputStream after use!
* ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT).addListener(ChannelFutureListener.CLOSE);
* }
* </pre>
*
* @author tbussier
* Temporary fork from RestEasy 3.1.0
*/
public class ChunkOutputStream extends OutputStream {
final ByteBuf buffer;
final ChannelHandlerContext ctx;
final NettyHttpResponse response;
ChunkOutputStream(NettyHttpResponse response, ChannelHandlerContext ctx, int chunksize) {
this.response = response;
if (chunksize < 1) {
throw new IllegalArgumentException(Messages.MESSAGES.chunkSizeMustBeAtLeastOne());
}
this.buffer = Unpooled.buffer(0, chunksize);
this.ctx = ctx;
}
@Override
public void write(int b) throws IOException {
if (buffer.maxWritableBytes() < 1) {
flush();
}
buffer.writeByte(b);
}
public void reset() {
if (response.isCommitted()) throw new IllegalStateException(Messages.MESSAGES.responseIsCommitted());
buffer.clear();
}
@Override
public void close() throws IOException {
flush();
super.close();
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
int dataLengthLeftToWrite = len;
int dataToWriteOffset = off;
int spaceLeftInCurrentChunk;
while ((spaceLeftInCurrentChunk = buffer.maxWritableBytes()) < dataLengthLeftToWrite) {
buffer.writeBytes(b, dataToWriteOffset, spaceLeftInCurrentChunk);
dataToWriteOffset = dataToWriteOffset + spaceLeftInCurrentChunk;
dataLengthLeftToWrite = dataLengthLeftToWrite - spaceLeftInCurrentChunk;
flush();
}
if (dataLengthLeftToWrite > 0) {
buffer.writeBytes(b, dataToWriteOffset, dataLengthLeftToWrite);
}
}
@Override
public void flush() throws IOException {
int readable = buffer.readableBytes();
if (readable == 0) return;
if (!response.isCommitted()) response.prepareChunkStream();
ctx.writeAndFlush(new DefaultHttpContent(buffer.copy()));
buffer.clear();
super.flush();
}
}