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 demonstrates excellent readability. It follows a clear, logical structure with a single class and three methods, each handling a distinct event. Nesting is completely flat, with no conditional blocks or loops. The intent of each method is immediately obvious from its name and the corresponding Netty API. Code length is minimal and focused, with no unnecessary verbosity. Each method body contains only one or two actions, maintaining clean action granularity. The reading flow is natural — method order follows typical handler lifecycle, and the single comment clarifies the exception handling approach. Minor deduct point for lack of Javadoc on methods, but overall this is near-exemplary readable code.
Run 3
The code is highly readable due to its clear structure, minimal nesting, and concise implementation. It follows standard Netty handler patterns with well-named methods that clearly indicate their purpose. The class annotation and Javadoc provide context. Each method performs a single, focused action with proper delegation to ChannelHandlerContext. The exception handler appropriately logs and closes the connection. The only minor deductions are for the imperative printStackTrace call rather than using a logging framework, and the import section could be slightly more organized. Overall, this is exemplary readable code that any Java developer could quickly understand.
Run 1
Code Structure: The class cleanly separates message handling, read completion, and exception handling into standard lifecycle methods. Nesting: Methods are flat, with no nested control flow. Clarity of intent: The class name, documentation, and straightforward write/flush calls clearly convey an SCTP echo handler; the exception comment explains connection closure. Code length: The implementation is concise without unnecessary logic. Action granularity: Each statement performs one action on its own line. Reading flow: Methods follow a natural sequence from receiving messages to flushing output and handling errors. A blank line between the package declaration and imports would slightly improve visual organization.
Run 2
Code Structure: A well-organized handler class separates message handling, read completion, and exception handling into distinct methods. Nesting: Completely flat method bodies make the code easy to scan. Clarity of intent: The class name, documentation, and straightforward write/flush operations clearly convey an SCTP echo server handler, though understanding the callbacks requires some Netty familiarity. Code length: Concise, with no unnecessary logic or boilerplate beyond framework requirements. Action granularity: Each statement performs one clear action on its own line. Reading flow: Imports, class documentation, and callbacks appear in a natural order, ending with exception handling. A blank line between the package declaration and imports would slightly improve formatting.
Run 3
Code Structure: Clearly organized into three focused event-handler methods. Nesting: Flat, with no nested control flow. Clarity of intent: The class name, documentation, and exception-handling comment clearly convey an SCTP echo server handler; understanding write/flush behavior 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: Imports, class declaration, and lifecycle callbacks follow a natural sequence from receiving data to flushing and handling errors. A blank line between the package declaration and imports would slightly improve visual separation.