import java.io.InputStream;
import java.util.List;
import javax.xml.transform.TransformerConfigurationException;
-import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
public final class NetconfEXIToMessageDecoder extends ByteToMessageDecoder {
private static final Logger LOG = LoggerFactory.getLogger(NetconfEXIToMessageDecoder.class);
+ private static final SAXTransformerFactory FACTORY = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
+ /**
+ * This class is not marked as shared, so it can be attached to only a single channel,
+ * which means that {@link #decode(ChannelHandlerContext, ByteBuf, List)}
+ * cannot be invoked concurrently. Hence we can reuse the reader.
+ */
+ private final EXIReader reader;
- private final NetconfEXICodec codec;
+ private NetconfEXIToMessageDecoder(final EXIReader reader) {
+ this.reader = Preconditions.checkNotNull(reader);
+ }
- public NetconfEXIToMessageDecoder(final NetconfEXICodec codec) {
- this.codec = Preconditions.checkNotNull(codec);
+ public static NetconfEXIToMessageDecoder create(final NetconfEXICodec codec) throws EXIOptionsException {
+ return new NetconfEXIToMessageDecoder(codec.getReader());
}
@Override
LOG.trace("Received to decode: {}", ByteBufUtil.hexDump(in));
}
- final EXIReader r = codec.getReader();
-
- final SAXTransformerFactory transformerFactory
- = (SAXTransformerFactory) TransformerFactory.newInstance();
- final TransformerHandler handler = transformerFactory.newTransformerHandler();
- r.setContentHandler(handler);
+ final TransformerHandler handler = FACTORY.newTransformerHandler();
+ reader.setContentHandler(handler);
final DOMResult domResult = new DOMResult();
handler.setResult(domResult);
try (final InputStream is = new ByteBufInputStream(in)) {
- r.parse(new InputSource(is));
+ // Performs internal reset before doing anything
+ reader.parse(new InputSource(is));
}
out.add(new NetconfMessage((Document) domResult.getNode()));