Netty ByteBuf First Time Implementation

Question

My Plan is to have a message protocol as outlined below:

MessageLength: integer with total message length
MessageID: integer with auto incrementing identifier
MessageType: integer (enum) with the type of message
Payload: byte[] with the Payload of the message (Serialised POJO)

At the moment I just am looking at making sure I create the ByteBuf in the correct and optimal way. At this stage I have the following:

io.netty.buffer.ByteBuf buf = Unpooled.buffer(); // Test Data Class TestData test = new TestData("FirstName", "LastName", 40); // Convert to Bytes is method to return the Byte Array (Serialised POJO) byte[] payload = convertToBytes(test); // Write 1 simulating MessageID 1 buf.writeInt(1); // Write 2 simulating MessageType of 2 buf.writeInt(2); // Write The Payload data<BR> buf.writeBytes(payload);

The goal would be to them pass on to a LengthFieldPrepender and up the pipeline.

Is this the right way to create the ByteBuf? Or is there a better way?

Norman Maurer · Accepted Answer · 2017-05-01 13:35:18Z

You should use the allocator to create the ByteBuf if possible as this may give you a pooled ByteBuf (depending on the configuration).

Something like:

Channel channel = ... channel.alloc().buffer(expectedSize)

Also note that I passed in the expected size of the ByteBuf as this will ensure we not need to expand it later on when you fill it.

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