Problem
I am facing a problem using dynamically created list of items when Add method is called on dynamicvariable. Consider following code.
IEnumerable<dynamic> plugins = (IEnumerable<dynamic>)field.GetValue(instance);
if (plugins == null)
continue;
dynamic filteredPlugins = null;
foreach (var plugin in plugins)
{
if (filteredPlugins == null)
filteredPlugins = Activator
.CreateInstance(typeof(List<>)
.MakeGenericType(plugin.GetType()));
if (/* this condition does not matter*/)
//filteredPlugins.Add(plugin);
filteredPlugins.GetType().GetMethod("Add")
.Invoke(filteredPlugins, new object[] { plugin });
}
And now, the commented line filteredPlugins.Add(plugin) will throw System.Reflection.TargetInvocationException with the message 'object' does not contain a definition for 'Add' when plugin is of type
System.ComponentModel.Composition.ExportServices.DisposableLazy<IPlugin,IMetadata>
but it works completely perfect when pluginis of type
System.Lazy<IPlugin, IMetadata>
When the reflection is used to call Add method on the instance filteredPlugins instance as is done on the next line - everything works fine for any type.
My question is WHY is not Add method found in case of DisposableLazy type.
Background
This code is part of the method that I use in OnImportsSatisfied() method. I am using two kinds of import - which differs only in RequiredCreationPolicy - on has CreationPolicy.NonShared and the other default value of CreationPolicy.Any.
[ImportMany(RequiredCreationPolicy = CreationPolicy.NonShared)]
private IEnumerable<Lazy<IPlugin, IMetadata>> plugins = null;
For CreationPolicy.NonShared fields the underlaying type in the plugins is DisposableLazy and for CreationPolicy.Any the underlaying type in the plugins is Lazy.
Edit: As asked in the answer - I am using dynamic variable because IPlugin interface can change everytime this method is called and they do not have to have anything in common.
Edit2: I just found similar question C# dynamic type gotcha, so this can be probably closed as duplicite.
Because System.ComponentModel.Composition.ExportServices.DisposableLazy is a private class, the runtime binder is having trouble believing you have permission to use type, where reflection doesn't care.
Which begs the question why are you using dynamics at all in this case. Since DisposableLazy<IPlugin,IMetadata> public interface is it's subclass Lazy<IPlugin, IMetadata> & IDisposable, shouldn't you just be using a List<Lazy<IPlugin, IMetadata>> for either case?
var plugins = (IEnumerable<Lazy<IPlugin, IMetadata>>)field.GetValue(instance);
if (plugins == null)
continue;
var filteredPlugins = new List<Lazy<IPlugin, IMetadata>>();
foreach (var plugin in plugins)
{
if (/* this condition does not matter*/)
filteredPlugins.Add(plugin);
}
}
Related
I recently switched to Java 11 for a rather big project, and would like to switch to using var class = new Class() instead of Class class = new CLass().
I tried using Intellij Structural Search (and replace) for this, but its turning out to be more complex than expected.
My first attempt was $Type$ $Inst$ = new $Constructor$($Argument$);, which also matches global variables (which don't allow var).
My second attempt is:
class $Class$ {
$ReturnType$ $Method$ ($ParameterType$ $Parameter$) throws $ExceptionType$ {
$Statements$;
final $Type$ $Inst$ = new $Constructor$($Argument$);
$Statements2$;
}
}
Which misses all calls inside e.g. try blocks (since they get matched by the expressions)
Any help would be greatly appreciated!
Use your first template
$Type$ $Inst$ = new $Constructor$($Argument$);
But add a Script modifier on the $Inst$ variable with the following text:
Inst instanceof com.intellij.psi.PsiLocalVariable
Alternatively you may want to try the Local variable type can be omitted inspection that is available in IntelliJ IDEA.
If you do not have experience with or aren't currently using EntitySpaces ("ES") ORM this question is not meant for you.
I have a 10 year old application that after 4 years now needs my attention. My application uses a now defunct ORM called EntitySpaces and I'm hoping if you're reading this you have experience or maybe still use it too! Switching to another ORM is not an option at this time so I need to find a way to make this work.
Between the time I last actively worked on my application and now (ES Version 2012-09-30), EntitySpaces ("ES") has gone through a significant change in the underlying ADO.net back-end. The scenario that I'm seeking help on is when an entity collection is loaded with only a subset of the columns:
_products = new ProductCollection();
_products.Query.SelectAllExcept(_products.Query.ImageData);
_products.LoadAll();
I then override the properties that weren't loaded in the initial select so that I may lazyload them in the accessor. Here is an example of one such lazy-loaded property that used to work perfectly.
public override byte[] ImageData
{
get
{
bool rowIsDirty = base.es.RowState != DataRowState.Unchanged;
// Check if we have loaded the blob data
if(base.Row.Table != null && base.Row.Table.Columns.Contains(ProductMetadata.ColumnNames.ImageData) == false)
{
// add the column before we can save data to the entity
this.Row.Table.Columns.Add(ProductMetadata.ColumnNames.ImageData, typeof(byte[]));
}
if(base.Row[ProductMetadata.ColumnNames.ImageData] is System.DBNull)
{
// Need to load the data
Product product = new Product();
product.Query.Select(product.Query.ImageData).Where(product.Query.ProductID == base.ProductID);
if(product.Query.Load())
{
if (product.Row[ProductMetadata.ColumnNames.ImageData] is System.DBNull == false)
{
base.ImageData = product.ImageData;
if (rowIsDirty == false)
{
base.AcceptChanges();
}
}
}
}
return base.ImageData;
}
set
{
base.ImageData = value;
}
}
The interesting part is where I add the column to the underlying DataTable DataColumn collection:
this.Row.Table.Columns.Add(ProductMetadata.ColumnNames.ImageData, typeof(byte[]));
I had to comment out all the ADO.net related stuff from that accessor when I updated to the current (and open source) edition of ES (version 2012-09-30). That means that the "ImageData" column isn't properly configured and when I change it's data and attempt to save the entity I receive the following error:
Column 'ImageData' does not belong to table .
I've spent a few days looking through the ES source and experimenting and it appears that they no longer use a DataTable to back the entities, but instead are using a 'esSmartDictionary'.
My question is: Is there a known, supported way to accomplish the same lazy loaded behavior that used to work in the new version of ES? Where I can update a property (i.e. column) that wasn't included in the initial select by telling the ORM to add it to the entity backing store?
After analyzing how ES constructs the DataTable that is uses for updates it became clear that columns not included in the initial select (i.e. load) operation needed to be added to the esEntityCollectionBase.SelectedColumns dictionary. I added the following method to handle this.
/// <summary>
/// Appends the specified column to the SelectedColumns dictionary. The selected columns collection is
/// important as it serves as the basis for DataTable creation when updating an entity collection. If you've
/// lazy loaded a column (i.e. it wasn't included in the initial select) it will not be automatically
/// included in the selected columns collection. If you want to update the collection including the lazy
/// loaded column you need to use this method to add the column to the Select Columns list.
/// </summary>
/// <param name="columnName">The lazy loaded column name. Note: Use the {yourentityname}Metadata.ColumnNames
/// class to access the column names.</param>
public void AddLazyLoadedColumn(string columnName)
{
if(this.selectedColumns == null)
{
throw new Exception(
"You can only append a lazy-loaded Column to a partially selected entity collection");
}
if (this.selectedColumns.ContainsKey(columnName))
{
return;
}
else
{
// Using the count because I can't determine what the value is supposed to be or how it's used. From
// I can tell it's just the number of the column as it was selected: if 8 colums were selected the
// value would be 1 through 8 - ??
int columnValue = selectedColumns.Count;
this.selectedColumns.Add(columnName, columnValue);
}
}
You would use this method like this:
public override System.Byte[] ImageData
{
get
{
var collection = this.GetCollection();
if(collection != null)
{
collection.AddLazyLoadedColumn(ProductMetadata.ColumnNames.ImageData);
}
...
It's a shame that nobody is interested in the open source EntitySpaces. I'd be happy to work on it if I thought it had a future, but it doesn't appear so. :(
I'm still interested in any other approaches or insight from other users.
I'm trying to create a IntelliJ plugin (mostly for learning purposes). My aim is that by pressing a keyboard shortcut the plugin will generate a corresponding PHP unit test method stub in the test file.
So let's say Db.php is open, the upon pressing Ctrl+Shift+U the plugin will create a unit test stub in DbTest.php.
So far I've figured out how to get the method name at cursor and how to locate the corresponding Unit test file (i.e. Db => DbTest) as PsiFile.
PsiFile[] search = FilenameIndex.getFilesByName(project, testFileName, scope); //scope is the test directory
PsiFile testFile = search[0];
What I cannot figure out is how to insert the generated new method stub this in testFile and then save the changes?
P.S. I see there exists a createMethodFromText function but how do I get the PsiClass from PsiFile? Also how do I save the changes?
There're just a few simple steps.
Find PhpClass you want to insert a new method in. As you already have PsiFile you can either traverse a tree manually or use PhpElementVisitor.
1.1. To travers a tree manually you can use PsiTreeUtil#findChildOfType method. In your case you'll need to find GroupStatement first, then the class you need.
1.2. Invoke PsiElement#accept method (PsiFile is an instance of PsiElement) provided with PhpElementVisitor with overridden #visitPhpGroupStatement and #visitPhpClass methods.
Use PhpPsiElementFactory#createMethod to create the new method from text. Note that this class isn't a part of the public API, so theoretically it can be easily changed/moved/removed/whatever in the future.
Use PsiElement#add (PhpClass is also an instance of PsiElement) to insert the method into the class.
That's all. You don't need to explicitly save the changes.
Here is what worked for me in the end. Thanks everyone for the help
for (int i = 0; i < found.getTextLength(); i++) {
PsiElement ele = found.findElementAt(i);
PhpClass phpClass = PsiTreeUtil.getParentOfType(ele, PhpClass.class);
if (phpClass != null) {
Method methodExists = findMethod(phpClass, methodName);
if (methodExists == null) {
new WriteCommandAction.Simple(phpClass.getProject(), phpClass.getContainingFile()) {
#Override
protected void run() throws Throwable {
PsiElement brace = phpClass.getLastChild();
if (brace != null) {
Method method = PhpPsiElementFactory.createMethod(phpClass.getProject(), "public function " + methodName + "() {\n\n}");
CodeStyleManager styleManager = CodeStyleManager.getInstance(getProject());
styleManager.reformat(method);
PsiElement newMethod = phpClass.addBefore(method, brace);
PsiNavigateUtil.navigate(newMethod);
}
}
}.execute();
} else {
PsiNavigateUtil.navigate(methodExists);
}
break;
}
}
I am trying to create a WCF service without knowing its type/interface at runtime. To do this, I use ChannelFactory. ChannelFactory is a generic class so I need to use Type.MakeGenericType. The type I pass to MakeGenericType is from a list of interfaces I previously gathered with reflection by searching some assemblies.
Ultimately, I call MethodInfo.Invoke to create the object. The object is created just fine, but I cannot cast it to the proper interface. Upon casting, I receive the following error:
"Unable to cast transparent proxy to type 'Tssc.Services.MyType.IMyType'"
After some experimenting, I have found that the interface/type passed to MakeGenericType seems to be the problem. If I substitute the interface in my list with the actual interface, then everything works fine. I have combed through the two objects and cannot see a difference. When I modify the code to produce both types, comparing them with Equals returns false. It is unclear to me whether Equals is just checking that they are referring to the same object (not) or thety are checking all properties, etc.
Could this have something to do with how I gathered my interfaces (Reflection, saving in a list...)? A comparison of the objects seems to indicate they are equivalent. I printed all properties for both objects and they are the same. Do I need to dig deeper? If so, into where?
// createService() method
//*** tried both of these interfaces, only 2nd works - but they seem to be identical
//Type t = interfaces[i]; // get type from list created above - doesn't work
Type t = typeof(Tssc.Services.MyType.IMyType); // actual type - works OK
// create ChannelFactory type with my type parameter (t)
Type factoryType = typeof(ChannelFactory<>);
factoryType = factoryType.MakeGenericType(new Type[] { t });
// create ChannelFactory<> object with two-param ctor
BasicHttpBinding binding = new BasicHttpBinding();
string address = "blah blah blah";
var factory = Activator.CreateInstance(factoryType, new object[] { binding, address });
// get overload of ChannelFactory<>.CreateChannel with no parameters
MethodInfo method = factoryType.GetMethod("CreateChannel", new Type[] { });
return method.Invoke(factory, null);
//--------------- code that calls code above and uses its return
object ob = createService();
//*** this cast fails
Tssc.Services.MyType.IMyType service = (Tssc.Services.MyType.IMyType)ob;
Ok, I understand whats happening here - the problem is relating to loading the same assembly being effectively loaded twice - once via a reference, and once via the assembly load command. What you need to do is change the place where you load your assembly, and check to see if it already exists in the current AppDomain, like this maybe:
Assembly assembly = AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault(a => a.GetName().Name.Equals("ClassLibrary1Name"));
if (assembly == null)
{
assembly = System.Reflection.Assembly.LoadFile("path to your assembly");
}
//do your work here
This way if the assembly is already loaded into memory, it'll use that one.
Some months back I was working on a project to display the WCF methods and thier parameters in a dropdown. At that time I was creating a proxy using Add Service Reference and hardcoded the service interface in the code.
How can I show all the methods that are available in my WCF in a dropdown
But when I try to create the proxy dynamically to do the same, the below code doesn't work. Please help me to show only the methods that was defined by me.
// Using Dynamic Proxy Factory by Vipul Modi # Microsoft
DynamicProxyFactory factory = new DynamicProxyFactory(txtService.Text);
// endpoints.
string sContract = "";
foreach (ServiceEndpoint endpoint in factory.Endpoints)
{
sContract = endpoint.Contract.Name; //this is the service interface name, IAccountInfoService
}
DynamicProxy proxy = factory.CreateProxy(sContract);
Type proxyType = proxy.ProxyType;
MethodInfo[] methods = proxyType.GetMethods();
foreach (var method in methods)
{
//if (method.GetCustomAttributes(typeof(OperationContractAttribute), true).Length == 0)
// continue;
string methodName = method.Name;
ddlMethods.Items.Add(methodName);
}
The code commented method.GetCustomAttributes(typeof(OperationContractAttribute), true).Length doesn't work. It doesn't show any method. If I comment it out, then the result is all methods and variables. I want to restrict it to only user defined methods.
i dont know anything about DynamicProxyFactory but looking at http://blogs.msdn.com/b/vipulmodi/archive/2006/11/16/dynamic-programming-with-wcf.aspx it makes me think that
1) the proxy doesnt actually emit methods with the attribute. it doesn't seem to have a need to though i suppose you could tweak the code on your own to make that happen.
2) if you just want a list of method names, it seems you can get that from factory.Contracts