Source code
package io.netty.example.sctp;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
/**
* Handler implementation for the SCTP echo server.
*/
@Sharable
public class SctpEchoServerHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ctx.write(msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
// Close the connection when an exception is raised.
cause.printStackTrace();
ctx.close();
}
}
Run 1
The code is highly readable. It has a clear, logical structure with imports, class declaration, and concise method overrides. Nesting is minimal, with no nested blocks or conditionals. Each method expresses a single intent: reading data, flushing, and handling exceptions. Code length is appropriate for an echo handler — no unnecessary boilerplate. Action granularity is well-maintained, with one action per line (e.g., `ctx.write(msg)` and `cause.printStackTrace()`). Reading flow is natural: the class is named clearly, methods are ordered logically, and the Javadoc comment explains the class purpose. Minor deduction for the inline comment in `exceptionCaught` being slightly redundant, but overall the code is nearly exemplary.
Run 2
The code is concise and well-structured. It follows a logical organization with clear method separation for reading, completing, and error handling. Nesting is minimal, and intent is unambiguous due to descriptive method names and JavaDoc. Each method performs a single action per line, contributing to clear action granularity. Reading flow is natural and straightforward. Minor deductions for lack of inline comments on the read/write logic and for directly printing stack trace, but overall readability is very high.
Run 3
The code is highly readable. It has a clear logical structure: package declaration, imports, class documentation, and a well-named class with three concise methods. Nesting is flat, with no conditional complexity. Intent is evident from names and comments—echoing data and gracefully handling exceptions. The code is concise, with each method performing a single clear action (write, flush, close). Reading flow is natural: the methods follow a logical lifecycle order. Minor deductions could be for the `printStackTrace` call, which is often discouraged in production code, but it does not significantly harm readability.
Run 1
Code Structure: Cleanly organized into three focused event-handler methods. Nesting: Flat, with no conditional branches or nested control flow. Clarity of intent: The class name, documentation, and method bodies clearly communicate echo-server behavior and exception handling. Code length: Concise, without unnecessary abstraction or repetition. Action granularity: Each statement performs one action, making operations easy to distinguish. Reading flow: Natural progression from receiving messages to flushing writes and handling exceptions. Minor improvement: A blank line between the package declaration and imports would improve visual separation.
Run 2
Code Structure: Logically organized into three focused event-handler methods. Nesting: Flat, with no conditional or loop nesting. Clarity of intent: The class name, documentation, and standard callback names clearly communicate an SCTP echo handler; understanding the separate write and flush callbacks requires some Netty familiarity. Code length: Concise, with no unnecessary logic or repetition. Action granularity: Each statement performs one action on its own line. Reading flow: Natural progression from receiving data to flushing writes and handling exceptions. A blank line between the package declaration and imports would slightly improve visual separation.
Run 3
Code Structure: Logically organized into three focused event-handler methods. Nesting: Flat, with no conditional branches or nested blocks. Clarity of intent: The class name, documentation, and standard callback names clearly convey an SCTP echo handler; separating writes from flushing requires minor Netty familiarity. Code length: Concise, with no unnecessary logic. Action granularity: Each statement performs one action on its own line. Reading flow: Methods follow a natural sequence from receiving data to completing reads and handling exceptions. A blank line between the package declaration and imports would slightly improve visual organization.