public static byte[] SerializeRuleToBuffer(FaultRule rule)
{
BinaryFormatter formatter = new BinaryFormatter();
using (MemoryStream stream = new MemoryStream())
{
formatter.Serialize(stream, rule);
return(stream.GetBuffer());
}
}
public static FaultRule[] Load()
{
// Using FaultScope
FaultScope currentFaultScope = FaultScope.Current; // save in case it changes on another thread
if (currentFaultScope != null)
{
return(currentFaultScope.FaultRules);
}
// Using FaultSession / serialization file
if (string.IsNullOrEmpty(serializationFileName))
{
return(null);
}
lock (initializeLock)
{
if (fileReadWriteMutex == null)
{
fileReadWriteMutex = new Mutex(false, Path.GetFileName(serializationFileName));
currentRules = Serializer.DeserializeRules(serializationFileName, fileReadWriteMutex);
return(currentRules);
}
}
FaultRule[] swapBuffer;
lock (accessCurrentRuleLock)
{
swapBuffer = new FaultRule[currentRules.Length];
currentRules.CopyTo(swapBuffer, 0);
}
FaultRule[] loadedRules = Serializer.DeserializeRules(serializationFileName, fileReadWriteMutex);
MergeRuleArray(swapBuffer, loadedRules);
lock (accessCurrentRuleLock)
{
currentRules = swapBuffer;
}
return(currentRules);
}
public static FaultRule[] Load()
{
string serializationFileName = Environment.GetEnvironmentVariable(EnvironmentVariable.RuleRepository);
if (serializationFileName == null)
{
throw new FaultInjectionException(string.Format(CultureInfo.CurrentCulture, ApiErrorMessages.UnableToFindEnvironmentVariable, EnvironmentVariable.RuleRepository));
}
lock (initializeLock)
{
if (fileReadWriteMutex == null)
{
fileReadWriteMutex = new Mutex(false, Path.GetFileName(serializationFileName));
currentRules = Serializer.DeserializeRules(serializationFileName, fileReadWriteMutex);
return(currentRules);
}
}
FaultRule[] swapBuffer;
lock (accessCurrentRuleLock)
{
swapBuffer = new FaultRule[currentRules.Length];
currentRules.CopyTo(swapBuffer, 0);
}
FaultRule[] loadedRules = Serializer.DeserializeRules(serializationFileName, fileReadWriteMutex);
MergeRuleArray(swapBuffer, loadedRules);
lock (accessCurrentRuleLock)
{
currentRules = swapBuffer;
}
return(currentRules);
}
/// <summary>
/// Copies the number of times the FaultRule has been called from another fault rule.
/// This is used when this is a new fault rule that has just been deserialized and it
/// is replacing an old fault rule.
/// </summary>
/// <param name="f">the old FaultRule that internal data should be copied from</param>
internal void CopyNumTimesCalled(FaultRule f)
{
numTimesCalled = f.numTimesCalled;
}
/// <summary>
/// Injected into the prologue of the target method.
/// </summary>
/// <param name="exceptionValue">Exception thrown by fault</param>
/// <param name="returnValue">Value to return from fault</param>
/// <returns></returns>
/// <remarks>
/// Trap creates a RuntimeContext for the current call and evaluates
/// the fault condition's Trigger method. If it evaluates to true
/// the fault's Retrieve method is called.
/// </remarks>
public static bool Trap(out Exception exceptionValue, out Object returnValue)
{
StackTrace stackTrace = new StackTrace(1);
CallStack callStack = new CallStack(stackTrace);
//stackFrame does not include Trap()
StackFrame stackFrame = stackTrace.GetFrame(0);
String currentFunction = callStack[0];
exceptionValue = null;
returnValue = null;
FaultRule[] newRules;
if (GetNewRulesAndPrepareContext(out newRules, currentFunction) == false)
{
return(false);
}
RuntimeContext currentContext = null;
FaultRule rule = null;
try
{
//Get Fault Rule and Update current RuntimeContext
int len = contexts.Length;
for (int i = 0; i < len; ++i)
{
if (newRules[i].FormalSignature != null &&
currentFunction.Equals(newRules[i].FormalSignature) == true)
{
rule = newRules[i];
currentContext = new RuntimeContext();
lock (contexts)
{
contexts[i].CalledTimes++;
currentContext.CalledTimes = contexts[i].CalledTimes;
}
currentContext.CallStack = callStack;
currentContext.CallStackTrace = stackTrace;
break;
}
}
//Using ICondition and IFault
if (rule == null)
{
return(false);
}
bool triggered = false;
try
{
lock (contexts)
{
triggered = rule.Condition.Trigger(currentContext);
if (triggered == true)
{
rule.Fault.Retrieve(currentContext, out (exceptionValue), out returnValue);
}
}
}
catch (System.Exception e)
{
throw new FaultInjectionException(FaultDispatcherMessages.NoExceptionAllowedInTriggerAndRetrieve, e);
}
if (!triggered)
{
return(false);
}
}
catch (System.Exception e)
{
throw new FaultInjectionException(FaultDispatcherMessages.UnknownExceptionInTrap, e);
}
// check return-value's type if not to throw exception
if (null == exceptionValue)
{
if (stackFrame.GetMethod() is ConstructorInfo)
{
return(true);
}
Type returnTypeOfTrappedMethod = ((MethodInfo)stackFrame.GetMethod()).ReturnType;
return(CheckReturnType(returnTypeOfTrappedMethod, returnValue, currentFunction));
}
return(true);
}
