/*
* Copyright DataStax, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.oss.driver.internal.core.protocol;
import com.datastax.oss.driver.api.core.connection.FrameTooLongException;
import com.datastax.oss.protocol.internal.Frame;
import com.datastax.oss.protocol.internal.FrameCodec;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;
import java.util.List;
import net.jcip.annotations.ThreadSafe;
@ChannelHandler.Sharable
@ThreadSafe
public class FrameEncoder extends MessageToMessageEncoder<Frame> {
private final FrameCodec<ByteBuf> frameCodec;
private final int maxFrameLength;
public FrameEncoder(FrameCodec<ByteBuf> frameCodec, int maxFrameLength) {
super(Frame.class);
this.frameCodec = frameCodec;
this.maxFrameLength = maxFrameLength;
}
@Override
protected void encode(ChannelHandlerContext ctx, Frame frame, List<Object> out) throws Exception {
ByteBuf buffer = frameCodec.encode(frame);
int actualLength = buffer.readableBytes();
if (actualLength > maxFrameLength) {
throw new FrameTooLongException(
ctx.channel().remoteAddress(),
String.format("Outgoing frame length exceeds %d: %d", maxFrameLength, actualLength));
}
out.add(buffer);
}
}