Source code
package io.netty.channel;
import io.netty.util.internal.ThrowableUtil;
import io.netty.util.internal.UnstableApi;
import java.nio.channels.ClosedChannelException;
/**
* Cheap {@link ClosedChannelException} that does not fill in the stacktrace.
*/
@UnstableApi
public final class StacklessClosedChannelException extends ClosedChannelException {
private static final long serialVersionUID = -2214806025529435136L;
private StacklessClosedChannelException() { }
@Override
public Throwable fillInStackTrace() {
// Suppress a warning since this method doesn't need synchronization
return this;
}
/**
* Creates a new {@link StacklessClosedChannelException} which has the origin of the given {@link Class} and method.
*/
public static StacklessClosedChannelException newInstance(Class<?> clazz, String method) {
return ThrowableUtil.unknownStackTrace(new StacklessClosedChannelException(), clazz, method);
}
}
Run 1
The code is exceptionally readable. It is well-structured with clear class and method separation, imports, and documentation. Nesting is nonexistent (flat structure), and intent is explicitly stated via Javadoc and method names like `newInstance`. The code is concise, avoiding boilerplate while including only necessary overrides. Each action is on its own line, and the reading flow is natural: class declaration, constants, constructor, override, then factory method. The only minor deduction is the lack of a blank line between the serialVersionUID and the constructor, but this is negligible.
Run 2
The code is well-structured and highly readable. It has a clear single responsibility: creating a lightweight exception without stacktrace overhead. The class is flat with minimal nesting, and the intent is immediately obvious from the class name, Javadoc, and method names. The code is concise, with each action on its own line and no redundant logic. The only minor deduction is that the static factory method delegates to a utility method, adding slight indirection, but this is justified for performance and follows Netty conventions. Overall, the reading flow is natural: exceptions definition, suppressed stacktrace behavior, then factory method.
Run 3
The code is highly readable with a clear, single-purpose class. Structure is logical: package declaration, imports, Javadoc, class definition, constant, private constructor, overridden method, and factory method. Nesting is minimal—only a single method override and a static factory, both flat. Intent is explicitly documented through Javadoc and method names like `newInstance` and `fillInStackTrace`, making the purpose unambiguous. Code length is concise and appropriate; no unnecessary code exists. Action granularity is excellent—each line performs a single, focused action. Reading flow is natural: the class progresses from definition to implementation details to public API in a logical order. Minor deductions: the `@UnstableApi` annotation and the comment about synchronization could be slightly more explanatory, and the factory method accepts a `Class<?>` parameter without validating it, but these are negligible. Overall, this is exemplary readable code.
Run 1
Code Structure: Logically organized into a serial identifier, private constructor, override, and factory method. Nesting: Flat, with no nested control flow. Clarity of intent: The class name, documentation, and fillInStackTrace override clearly communicate the stackless exception behavior; clazz is slightly less descriptive than originClass. Code length: Concise, with no unnecessary implementation. Action granularity: Each statement performs one coherent action; the factory's inline construction is easy to follow. Reading flow: Natural and consistent, though blank lines separating the package declaration and import groups would improve visual organization.
Run 2
Code Structure: The class is logically organized into a constant, private constructor, overridden method, and factory method. Nesting: There is no nested control flow, making the code easy to scan. Clarity of intent: The class name, documentation, and fillInStackTrace override clearly communicate the stackless exception behavior; the factory delegates stack-trace attribution to a descriptively named utility. Code length: The implementation is concise without unnecessary logic. Action granularity: Each statement performs one clear action, although the factory combines construction and utility invocation in a single readable expression. Reading flow: The progression from class purpose to implementation and creation is natural. Minor drawbacks include the generic parameter names clazz and method and the lack of spacing between the package declaration and imports.
Run 3
Code Structure: The class is logically organized into a constant, constructor, override, and factory method. Nesting: There is no nested control flow, making it easy to scan. Clarity of intent: The class name, documentation, and fillInStackTrace override clearly communicate the stackless exception behavior; clazz is slightly less descriptive than originClass. Code length: The implementation is concise without unnecessary logic. Action granularity: Each statement performs one clear action, although the factory return combines construction and stack-trace customization. Reading flow: The code progresses naturally from class setup to behavior and instance creation. Minor formatting improvements, such as separating the package declaration from imports, would improve readability.