--- /dev/null
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.netconf.nettyutil.handler;
+
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToByteEncoder;
+import java.nio.charset.StandardCharsets;
+import org.opendaylight.netconf.util.messages.NetconfMessageConstants;
+
+public class ChunkedFramingMechanismEncoder extends MessageToByteEncoder<ByteBuf> {
+ public static final int DEFAULT_CHUNK_SIZE = 8192;
+ public static final int MIN_CHUNK_SIZE = 128;
+ public static final int MAX_CHUNK_SIZE = 16 * 1024 * 1024;
+
+ private final int chunkSize;
+
+ public ChunkedFramingMechanismEncoder() {
+ this(DEFAULT_CHUNK_SIZE);
+ }
+
+ public ChunkedFramingMechanismEncoder(final int chunkSize) {
+ Preconditions.checkArgument(chunkSize >= MIN_CHUNK_SIZE && chunkSize <= MAX_CHUNK_SIZE,
+ "Unsupported chunk size %s", chunkSize);
+ this.chunkSize = chunkSize;
+ }
+
+ public final int getChunkSize() {
+ return chunkSize;
+ }
+
+ @Override
+ protected void encode(final ChannelHandlerContext ctx, final ByteBuf msg, final ByteBuf out) {
+ do {
+ final int xfer = Math.min(chunkSize, msg.readableBytes());
+
+ out.writeBytes(NetconfMessageConstants.START_OF_CHUNK);
+ out.writeBytes(String.valueOf(xfer).getBytes(StandardCharsets.US_ASCII));
+ out.writeByte('\n');
+
+ out.writeBytes(msg, xfer);
+ } while (msg.isReadable());
+
+ out.writeBytes(NetconfMessageConstants.END_OF_CHUNK);
+ }
+}