public LogicalChannelBinding(
LogicalChannel logicalChannel,
LogicalChannelBindingMethodDesc consumingBindingDesc,
LogicalChannelBindingMethodDesc consumingSignalBindingDesc)
{
LogicalChannel = logicalChannel;
ConsumingBindingDesc = consumingBindingDesc;
ConsumingSignalBindingDesc = consumingSignalBindingDesc;
}
private static LogicalChannelBindingMethodDesc FindMatchingMethod(
string operatorName,
Type target,
LogicalChannel channelDesc,
bool isPunctuation)
{
if (isPunctuation) {
foreach (var method in target.GetMethods()) {
if (method.Name.Equals("OnSignal")) {
return new LogicalChannelBindingMethodDesc(method, LogicalChannelBindingTypePassAlong.INSTANCE);
}
}
return null;
}
var outputPort = channelDesc.OutputPort;
Type[] expectedIndividual;
Type expectedUnderlying;
EventType expectedUnderlyingType;
var typeDesc = outputPort.GraphTypeDesc;
if (typeDesc.IsWildcard) {
expectedIndividual = new Type[0];
expectedUnderlying = null;
expectedUnderlyingType = null;
}
else {
expectedIndividual = new Type[typeDesc.EventType.PropertyNames.Length];
var i = 0;
foreach (var descriptor in typeDesc.EventType.PropertyDescriptors) {
expectedIndividual[i] = descriptor.PropertyType;
i++;
}
expectedUnderlying = typeDesc.EventType.UnderlyingType;
expectedUnderlyingType = typeDesc.EventType;
}
string channelSpecificMethodName = null;
if (channelDesc.ConsumingOptStreamAliasName != null) {
channelSpecificMethodName = "On" + channelDesc.ConsumingOptStreamAliasName;
}
var methods = target.GetMethods();
foreach (var method in methods) {
var eligible = method.Name.Equals("OnInput");
if (!eligible && method.Name.Equals(channelSpecificMethodName)) {
eligible = true;
}
if (!eligible) {
continue;
}
// handle Object[]
var paramTypes = method.GetParameterTypes();
var numParams = paramTypes.Length;
if (expectedUnderlying != null) {
if (numParams == 1 &&
TypeHelper.IsAssignmentCompatible(expectedUnderlying, paramTypes[0])) {
return new LogicalChannelBindingMethodDesc(
method, LogicalChannelBindingTypePassAlong.INSTANCE);
}
if (numParams == 2 &&
paramTypes[0].GetBoxedType() == typeof(int?) &&
TypeHelper.IsAssignmentCompatible(expectedUnderlying, paramTypes[1])) {
return new LogicalChannelBindingMethodDesc(
method,
new LogicalChannelBindingTypePassAlongWStream(channelDesc.ConsumingOpStreamNum));
}
}
if (numParams == 1 &&
(paramTypes[0] == typeof(object) ||
paramTypes[0] == typeof(object[]) &&
method.IsVarArgs())) {
return new LogicalChannelBindingMethodDesc(
method, LogicalChannelBindingTypePassAlong.INSTANCE);
}
if (numParams == 2 &&
paramTypes[0] == typeof(int) &&
(paramTypes[1] == typeof(object) ||
paramTypes[1] == typeof(object[]) &&
method.IsVarArgs())) {
return new LogicalChannelBindingMethodDesc(
method,
new LogicalChannelBindingTypePassAlongWStream(channelDesc.ConsumingOpStreamNum));
}
// if exposing a method that exactly matches each property type in order, use that, i.e. "onInut(String p0, int p1)"
if (expectedUnderlyingType is ObjectArrayEventType &&
TypeHelper.IsSignatureCompatible(expectedIndividual, paramTypes)) {
return new LogicalChannelBindingMethodDesc(method, LogicalChannelBindingTypeUnwind.INSTANCE);
}
}
ISet<string> choices = new LinkedHashSet<string>();
choices.Add(typeof(object).Name);
choices.Add("Object[]");
if (expectedUnderlying != null) {
choices.Add(expectedUnderlying.Name);
}
throw new ExprValidationException(
"Failed to find OnInput method on for operator '" +
operatorName +
"' class " +
target.Name +
", expected an OnInput method that takes any of {" +
CollectionUtil.ToString(choices) +
"}");
}