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• finagle-thrift_2.9.2
• 6.20.0
• source code
• ThriftFrameCodec.scala

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com.twitter.finagle.thrift.ThriftFrameCodec.scala Maven / Gradle / Ivy

package com.twitter.finagle.thrift

import org.jboss.netty.channel.{SimpleChannelHandler, ChannelEvent, ChannelHandlerContext}
import org.jboss.netty.handler.codec.frame.{LengthFieldBasedFrameDecoder, LengthFieldPrepender}

/**
 * Channel handler `ThriftFrameCodec` frames and unframes thrift
 * messages according to the Apache Thrift framed protocol: a message
 * is prefixed with a 4-byte, big-endian integer indicating the size
 * of the message that follows.
 */
private class ThriftFrameCodec extends SimpleChannelHandler {
  private[this] val decoder = new LengthFieldBasedFrameDecoder(0x7FFFFFFF, 0, 4, 0, 4)
  private[this] val encoder = new LengthFieldPrepender(4)

  override def handleUpstream(ctx: ChannelHandlerContext, e: ChannelEvent) =
    decoder.handleUpstream(ctx, e)

  override def handleDownstream(ctx: ChannelHandlerContext, e: ChannelEvent) =
    encoder.handleDownstream(ctx, e)
}