bridge5

task generateProfilerSource {
    def agentSrcDir = file("$buildDir/profiler-src/comet/agent")
    doFirst {
        agentSrcDir.mkdirs()
        def javaFile = new File(agentSrcDir, "ProfilerAgent.java")
        javaFile.text = """
package comet.agent;

import net.bytebuddy.agent.builder.AgentBuilder;
import net.bytebuddy.implementation.bind.annotation.*;
import net.bytebuddy.matcher.ElementMatchers;
import java.lang.instrument.Instrumentation;
import java.lang.reflect.Method;
import java.io.*;
import java.nio.file.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.LongAdder;
import java.text.SimpleDateFormat;

public class ProfilerAgent {
    public static final ConcurrentHashMap<String, Stats> metrics = new ConcurrentHashMap<>();
    private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    public static void premain(String agentArgs, Instrumentation inst) {
        String[] parts = (agentArgs != null) ? agentArgs.split(";") : new String[0];
        String configPath = parts.length > 0 ? parts[0] : "profiler_targets.txt";
        int interval = parts.length > 1 ? Integer.parseInt(parts[1]) : 60;
        String outputDir = parts.length > 2 ? parts[2] : ".";

        List<String> targetClasses = loadClasses(configPath);
        startReporter(interval, outputDir);

        AgentBuilder agentBuilder = new AgentBuilder.Default()
            .with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION);

        for (String className : targetClasses) {
            agentBuilder = agentBuilder
                .type(ElementMatchers.named(className.trim()))
                .transform((builder, td, cl, m) -> 
                    builder.method(ElementMatchers.any()
                           .and(ElementMatchers.not(ElementMatchers.isAbstract()))
                           .and(ElementMatchers.not(ElementMatchers.isNative())))
                           .intercept(MethodDelegation.to(Interceptor.class))
                );
        }
        agentBuilder.installOn(inst);
    }

    private static List<String> loadClasses(String path) {
        try { return Files.readAllLines(Paths.get(path)); }
        catch (Exception e) { return Collections.emptyList(); }
    }

    public static class Interceptor {
        @RuntimeType
        public static Object intercept(@Origin Method method, @SuperCall Callable<?> callable) throws Exception {
            long start = System.nanoTime();
            try { return callable.call(); }
            finally {
                long duration = System.nanoTime() - start;
                String key = method.getDeclaringClass().getSimpleName() + "." + method.getName();
                metrics.computeIfAbsent(key, k -> new Stats()).record(duration);
            }
        }
    }

    public static class Stats {
        public final LongAdder count = new LongAdder();
        public final LongAdder totalTime = new LongAdder();
        public void record(long nanos) {
            count.increment();
            totalTime.add(nanos);
        }
    }

    private static void startReporter(int seconds, final String outputDir) {
        File csvFile = new File(outputDir, "profiler_combined_report.csv");

        Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {
            String timestamp = sdf.format(new Date());
            boolean writeHeader = !csvFile.exists() || csvFile.length() == 0;

            try (PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(csvFile, true)))) {
                if (writeHeader) {
                    pw.println("Timestamp,Method,Calls,Avg_MS,Total_MS");
                }

                metrics.forEach((k, v) -> {
                    long c = v.count.sumThenReset();
                    long t = v.totalTime.sumThenReset();
                    if (c > 0) {
                        pw.printf("%s,%s,%d,%.4f,%.2f%n", timestamp, k, c, (t / (double)c) / 1e6, t / 1e6);
                    }
                });
                pw.flush();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }, seconds, seconds, TimeUnit.SECONDS);
    }
}
"""
    }
}