/// <summary>Returns the desired method to call and it's parameters types, as specified in the payload parameter.</summary>
/// <param name="payload">The payload specifying the parameters and the method that wants to be called. </param>
/// <param name="bindingFlags">The flags that will be used for trying to get the desired method through reflection.</param>
/// <param name="settingItem">The object from which obtain the method to be called. </param>
/// <returns>A SettingInfo object with the method to be called and an array with it's type parameters". </returns>
public static SetInfo GetDesiredMethod(Payload payload, BindingFlags bindingFlags, SettingItem settingItem)
{
// Get the parameter types to get the right overload.
Type[] paramTypes = Type.EmptyTypes;
if (payload.Parameters != null)
{
paramTypes = payload.Parameters.Select(p => p.GetType()).ToArray();
}
MethodInfo method =
settingItem.GetType().GetMethod(payload.Method, bindingFlags, null, paramTypes, null);
if (method == null)
{
// Method can't be found matching the parameter types, get any method with the same name
// and let .Invoke worry about the parameters.
try
{
method = settingItem.GetType().GetMethod(payload.Method, bindingFlags);
}
catch (AmbiguousMatchException)
{
method = null;
}
if (method == null)
{
throw new SettingFailedException("Unknown method " + payload.Method);
}
}
if (!method.IsExposed())
{
// Only use those with the "Exposed" attribute.
throw new SettingFailedException("Not an exposed method " + payload.Method);
}
return(new SetInfo(method, paramTypes));
}
/// <summary>
/// Applies a payload, by invoking the method identified in <c>payload</c>.
/// </summary>
/// <param name="payload">The payload.</param>
/// <returns>The result.</returns>
public static Result Apply(Payload payload)
{
Result result = new Result(payload);
try
{
if (string.IsNullOrEmpty(payload.SettingId))
{
throw new SettingFailedException("settingID is required.");
}
if (string.IsNullOrEmpty(payload.Method))
{
throw new SettingFailedException("method is required.");
}
SettingItem settingItem;
// Cache the instance, incase it's re-used.
if (!settingCache.TryGetValue(payload.SettingId, out settingItem))
{
settingItem = new SettingItem(payload.SettingId, SettingHandler.DryRun);
settingCache[payload.SettingId] = settingItem;
}
payload.SettingItem = settingItem;
// Get the parameter types to get the right overload.
Type[] paramTypes = Type.EmptyTypes;
if (payload.Parameters != null)
{
paramTypes = payload.Parameters.Select(p => p.GetType()).ToArray();
}
BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase;
MethodInfo method =
settingItem.GetType().GetMethod(payload.Method, bindingFlags, null, paramTypes, null);
if (method == null)
{
// Method can't be found matching the parameter types, get any method with the same name
// and let .Invoke worry about the parameters.
try
{
method = settingItem.GetType().GetMethod(payload.Method, bindingFlags);
}
catch (AmbiguousMatchException)
{
method = null;
}
if (method == null)
{
throw new SettingFailedException("Unknown method " + payload.Method);
}
}
if (!method.IsExposed())
{
// Only use those with the "Exposed" attribute.
throw new SettingFailedException("Not an exposed method " + payload.Method);
}
try
{
result.ReturnValue = method.Invoke(settingItem, payload.Parameters);
if (!(payload.Async ?? true))
{
settingItem.WaitForCompletion(5);
}
}
catch (Exception e)
{
// Catching general exceptions is ok with .NET 4 because corrupted state exceptions aren't caught.
throw new SettingFailedException(null, e.InnerException ?? e);
}
}
catch (SettingFailedException e)
{
result.IsError = true;
result.ErrorMessage = e.Message;
}
return(result);
}
