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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.invocation;

import java.lang.reflect.*;
import java.util.concurrent.locks.*;

import mockit.*;
import mockit.internal.expectations.*;
import mockit.internal.util.*;

abstract class DynamicInvocationResult extends InvocationResult
{
   private static final Object[] NO_ARGS = {};

   private final Object targetObject;
   final Method methodToInvoke;
   private int numberOfRegularParameters;
   private boolean hasInvocationParameter;

   DynamicInvocationResult(Object targetObject, Method methodToInvoke)
   {
      this.targetObject = targetObject;
      this.methodToInvoke = methodToInvoke;
      determineWhetherMethodToInvokeHasInvocationParameter();
   }

   private void determineWhetherMethodToInvokeHasInvocationParameter()
   {
      Class[] parameters = methodToInvoke.getParameterTypes();
      int n = parameters.length;
      hasInvocationParameter = n > 0 && parameters[0] == Invocation.class;
      numberOfRegularParameters = hasInvocationParameter ? n - 1 : n;
   }

   public final Object invokeMethodOnTargetObject(
      Object mockOrRealObject, ExpectedInvocation invocation, InvocationConstraints constraints, Object[] args)
   {
      Object[] delegateArgs = numberOfRegularParameters == 0 ? NO_ARGS : args;
      Object result;

      if (hasInvocationParameter) {
         result = invokeMethodWithContext(mockOrRealObject, invocation, constraints, args, delegateArgs);
      }
      else {
         result = executeMethodToInvoke(delegateArgs);
      }

      return result;
   }

   private Object invokeMethodWithContext(
      Object mockOrRealObject, ExpectedInvocation expectedInvocation, InvocationConstraints constraints,
      Object[] invokedArgs, Object[] delegateArgs)
   {
      DelegateInvocation invocation =
         new DelegateInvocation(mockOrRealObject, invokedArgs, expectedInvocation, constraints);
      Object[] delegateArgsWithInvocation = ParameterReflection.argumentsWithExtraFirstValue(delegateArgs, invocation);

      try {
         Object result = executeMethodToInvoke(delegateArgsWithInvocation);
         return invocation.proceedIntoConstructor ? Void.class : result;
      }
      finally {
         constraints.setLimits(invocation.getMinInvocations(), invocation.getMaxInvocations());
      }
   }

   protected final Object executeMethodToInvoke(Object[] args)
   {
      ReentrantLock reentrantLock = RecordAndReplayExecution.RECORD_OR_REPLAY_LOCK;

      if (!reentrantLock.isHeldByCurrentThread()) {
         return MethodReflection.invoke(targetObject, methodToInvoke, args);
      }

      reentrantLock.unlock();

      try {
         return MethodReflection.invoke(targetObject, methodToInvoke, args);
      }
      finally {
         //noinspection LockAcquiredButNotSafelyReleased
         reentrantLock.lock();
      }
   }
}