TracerAspect.java

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package br.ufrgs.inf.prosoft.applicationtracer;

import br.ufrgs.inf.prosoft.trace.Parameter;
import br.ufrgs.inf.prosoft.trace.Return;
import br.ufrgs.inf.prosoft.trace.Trace;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.json.JSONObject;

/**
 *
 * @author romulo
 */
@Aspect
public class TracerAspect {

    @Pointcut("execution(!void *(..))")
    public void anyMethodExecution() {
    }

    @Around("anyMethodExecution()")
    public Object serializeMethodCall(ProceedingJoinPoint joinPoint) throws Throwable {
        long startTime = System.currentTimeMillis();
        Object proceed = joinPoint.proceed();
        long endTime = System.currentTimeMillis();
        if (startTime == endTime) {
            return proceed;
        }
        try {
            String longsignature = joinPoint.getSignature().toLongString();
            String[] split = longsignature.substring(0, longsignature.length() - 1).split("\\(");
            String[] modifiersReturnAndName = split[0].split(" ");
            String[] modifiers = Arrays.copyOf(modifiersReturnAndName, modifiersReturnAndName.length - 2);
            String methodName = modifiersReturnAndName[modifiersReturnAndName.length - 1];
            String returnType = modifiersReturnAndName[modifiersReturnAndName.length - 2];
            List<Parameter> parameters = new ArrayList<>();
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
            if (split.length > 1) {
                String[] parameterTypes = split[1].split(", ");
                Object[] parametersData = joinPoint.getArgs();
                for (int i = 0; i < parametersData.length; i++) {
                    JSONObject.resetCycleBreaker();
                    String parameter = new JSONObject(parametersData[i]).toString();
                    parameters.add(new Parameter(parameterTypes[i], messageDigest.digest(parameter.getBytes()).toString()));
                }
            }
            JSONObject.resetCycleBreaker();
            Return returnValue = new Return(returnType, messageDigest.digest(new JSONObject(proceed).toString().getBytes()).toString());
            Trace trace = new Trace(Arrays.asList(modifiers), returnValue, methodName, parameters, startTime, endTime);
            JSONObject.resetCycleBreaker();
            String signature = new JSONObject(trace).toString();
            signature += "\n";
            try {
                Files.write(Paths.get("./trace"), signature.getBytes(), StandardOpenOption.APPEND);
            } catch (NoSuchFileException e) {
                Files.write(Paths.get("./trace"), signature.getBytes(), StandardOpenOption.CREATE);
            }
            System.out.print(signature);
        } catch (Exception ex) {
            System.err.println(ex);
        }
        return proceed;
    }
}