bridge48

package comet.agent;

import net.bytebuddy.agent.builder.AgentBuilder;
import net.bytebuddy.asm.Advice;
import net.bytebuddy.matcher.ElementMatchers;
import net.bytebuddy.description.type.TypeDescription;
import java.lang.instrument.Instrumentation;
import java.io.*;
import java.nio.file.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.LongAdder;
import java.text.SimpleDateFormat;
import java.util.jar.JarFile;

public class ProfilerAgent {
    private static final String MAP_KEY = "comet.metrics.global";
    private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    @SuppressWarnings("unchecked")
    public static ConcurrentHashMap<String, Stats> getGlobalMap() {
        if (System.getProperties().get(MAP_KEY) == null) {
            System.getProperties().put(MAP_KEY, new ConcurrentHashMap<String, Stats>());
        }
        return (ConcurrentHashMap<String, Stats>) System.getProperties().get(MAP_KEY);
    }

    public static void agentmain(String agentArgs, Instrumentation inst) {
        setupBootstrap(inst);
        premain(agentArgs, inst);
    }

    public static void premain(String agentArgs, Instrumentation inst) {
        // Prevent double-initialization
        if (System.getProperty("profiler.active") != null) return;
        System.setProperty("profiler.active", "true");

        String folderPath = "build/profiler-results";
        new File(folderPath).mkdirs();

        // Load targets into a HashSet for O(1) lookup speed
        Set<String> targets = new HashSet<>(loadClasses("profiler_targets.txt"));
        System.out.println("PROFILER: Optimized for " + targets.size() + " targets.");

        startReporter(60, folderPath);

        new AgentBuilder.Default()
            .with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)
            .with(AgentBuilder.TypeStrategy.Default.REDEFINE)
            .with(new AgentBuilder.CircularityLock.Default()) 
            // CRITICAL: Ignore these to save memory and prevent OOM
            .ignore(ElementMatchers.nameStartsWith("java.")
                .or(ElementMatchers.nameStartsWith("jdk."))
                .or(ElementMatchers.nameStartsWith("sun."))
                .or(ElementMatchers.nameStartsWith("com.sun."))
                .or(ElementMatchers.nameStartsWith("net.bytebuddy."))
                .or(ElementMatchers.nameStartsWith("org.apache."))
                .or(ElementMatchers.nameStartsWith("comcode.agent.")))
            .type(typeDescription -> {
                String name = typeDescription.getName();
                // Exact match or simple wildcard check
                if (targets.contains(name)) return true;
                for (String t : targets) {
                    if (t.endsWith("*") && name.startsWith(t.substring(0, t.length() - 1))) return true;
                }
                return false;
            })
            .transform((builder, typeDescription, classLoader, module) ->
                builder.method(ElementMatchers.any()
                        .and(ElementMatchers.not(ElementMatchers.isAbstract()))
                        .and(ElementMatchers.not(ElementMatchers.isNative())))
                        .intercept(Advice.to(ProfilerAdvice.class))
            )
            .installOn(inst);
    }

    private static void setupBootstrap(Instrumentation inst) {
        try {
            File agentJar = new File(ProfilerAgent.class.getProtectionDomain().getCodeSource().getLocation().toURI());
            if (agentJar.exists()) {
                inst.appendToBootstrapClassLoaderSearch(new JarFile(agentJar));
            }
        } catch (Exception ignored) {}
    }

    private static List<String> loadClasses(String path) {
        try {
            List<String> lines = Files.readAllLines(Paths.get(path));
            List<String> clean = new ArrayList<>();
            for(String s : lines) if(!s.trim().isEmpty()) clean.add(s.trim());
            return clean;
        } catch (Exception e) { return Collections.emptyList(); }
    }

    public static class ProfilerAdvice {
        @Advice.OnMethodEnter
        static long enter() { return System.nanoTime(); }

        @Advice.OnMethodExit(onThrowable = Throwable.class)
        static void exit(@Advice.Enter long start, @Advice.Origin("#t.#m") String methodName) {
            if (start == 0L) return;
            long duration = System.nanoTime() - start;
            ConcurrentHashMap<String, Stats> metrics = comet.agent.ProfilerAgent.getGlobalMap();
            Stats s = metrics.get(methodName);
            if (s == null) {
                metrics.putIfAbsent(methodName, new comet.agent.ProfilerAgent.Stats());
                s = metrics.get(methodName);
            }
            s.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, String outputDir) {
        Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {
            ConcurrentHashMap<String, Stats> metrics = getGlobalMap();
            File csvFile = new File(outputDir, "profiler-report.csv");
            try (PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(csvFile, true)))) {
                String ts = sdf.format(new Date());
                metrics.forEach((method, stats) -> {
                    long c = stats.count.sumThenReset();
                    long t = stats.totalTime.sumThenReset();
                    if (c > 0) {
                        pw.printf("%s,%s,%d,%.4f,%.2f%n", ts, method, c, (t/(double)c)/1000000.0, t/1000000.0);
                    }
                });
                pw.flush();
            } catch (Exception ignored) {}
        }, seconds, seconds, TimeUnit.SECONDS);
    }
}