I want to use btrace to inspect the byte[] value of a method return use the #Return annotation.
The byte array is actually a normal string encoded using utf8.
The class is like below:
Class A {
byte[] method1() {
...
}
}
I have tried printArray, but it only accepts type of Objetc[], not working for type of byte[].
For print, it just outputs the internal object id like '[B#4fbc7b65'.
Is there any other way can solve the problem?
Yes, this is an omission in BTrace (https://github.com/btraceio/btrace/issues/322)
For now, use "trusted" mode where the safety checks will be turned off and you can do eg.
#BTrace(trusted = true)
public class TrustedTrace {
#OnMethod(clazz = "MyClass", method = "m", location = Location(Kind.RETURN))
public static void intercept(#Return byte[] data) {
println(Arrays.toString(data));
}
}
Related
I'm attempting to do a POST with the body being an InputStream with something like this:
#POST("/build")
#Headers("Content-Type: application/tar")
Response build(#Query("t") String tag,
#Query("q") boolean quiet,
#Query("nocache") boolean nocache,
#Body TypedInput inputStream);
In this case the InputStream is from a compressed tar file.
What's the proper way to POST an InputStream?
You can upload inputStream using Multipart.
#Multipart
#POST("pictures")
suspend fun uploadPicture(
#Part part: MultipartBody.Part
): NetworkPicture
Then in perhaps your repository class:
suspend fun upload(inputStream: InputStream) {
val part = MultipartBody.Part.createFormData(
"pic", "myPic", RequestBody.create(
MediaType.parse("image/*"),
inputStream.readBytes()
)
)
uploadPicture(part)
}
If you want to find out how to get an image Uri, check this answer: https://stackoverflow.com/a/61592000/10030693
TypedInput is a wrapper around an InputStream that has metadata such as length and content type which is used in making the request. All you need to do is provide a class that implements TypedInput which passed your input stream.
class TarFileInput implements TypedInput {
#Override public InputStream in() {
return /*your input stream here*/;
}
// other methods...
}
Be sure you pass the appropriate return values for length() and mimeType() based on the type of file from which you are streaming content.
You can also optionally pass it as an anonymous implementation when you are calling your build method.
The only solution I came up with here was to use the TypeFile class:
TypedFile tarTypeFile = new TypedFile("application/tar", myFile);
and the interface (without explicitly setting the Content-Type header this time):
#POST("/build")
Response build(#Query("t") String tag,
#Query("q") boolean quiet,
#Query("nocache") boolean nocache,
#Body TypedInput inputStream);
Using my own implementation of TypedInput resulted in a vague EOF exception even while I provided the length().
public class TarArchive implements TypedInput {
private File file;
public TarArchive(File file) {
this.file = file;
}
public String mimeType() {
return "application/tar";
}
public long length() {
return this.file.length();
}
public InputStream in() throws IOException {
return new FileInputStream(this.file);
}
}
Also, while troubleshooting this issue I tried using the latest Apache Http client instead of OkHttp which resulted in a "Content-Length header already present" error even though I wasn't explicitly setting that header.
According to the Multipart section of http://square.github.io/retrofit/ you'll want to use TypedOutput instead of TypedInput. Following their examples for multipart uploads worked fine for me once I had implemented a TypedOutput class.
My solution was to implement TypedOutput
public class TypedStream implements TypedOutput{
private Uri uri;
public TypedStream(Uri uri){
this.uri = uri;
}
#Override
public String fileName() {
return null;
}
#Override
public String mimeType() {
return getContentResolver().getType(uri);
}
#Override
public long length() {
return -1;
}
#Override
public void writeTo(OutputStream out) throws IOException {
Utils.copyStream(getContentResolver().openInputStream(uri), out);
}
}
I have a class that looks as follows
class Person {
Long id;
String firstName;
int age;
}
and my input either looks like this:
{ "id": null, "firstName": "John", "age": 10 }
or like this:
{ "id": 123 }
The first variant represents a "new" (non-persisted) person and the second refers to a person by its database id.
If id is non-null, I would like to load the object from database during deserialization, otherwise fallback on regular parsing and deserialize it as a new object.
What I've tried: I currently have a JsonDeserializer for database-deserialization, but as I understand it, there is no way to "fall back" on regular parsing. According to this answer I should use a TypeAdapterFactory and the getDelegateAdapter. My problem with this approach is that I'm given a JsonReader (and not for instance a JsonElement) so I can't determine if the input contains a valid id without consuming input.
Any suggestions on how to solve this?
I don't know if I understand your question correctly, but if you already have a JsonDeserializer, you should have a method like this one in there:
public Person deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) { ... }
In this method you have the object context of type JsonDeserializationContext, which allows you to invoke default deserialization on a specified object.
So, you could do something like inside your custom deserializer:
//If id is null...
Person person = context.deserialize(json, Person.class);
See JsonDeserializationContext documentation.
I think I managed to figure this out with the help of the answer over here.
Here is a working type adapter factory:
new TypeAdapterFactory() {
#Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
final TypeAdapter<JsonElement> elementAdapter =
gson.getAdapter(JsonElement.class);
// Are we asked to parse a person?
if (!type.getType().equals(Person.class))
return null;
return new TypeAdapter<T>() {
#Override
public T read(JsonReader reader) throws IOException {
JsonElement tree = elementAdapter.read(reader);
JsonElement id = tree.getAsJsonObject().get("id");
if (id == null)
return delegate.fromJsonTree(tree);
return (T) findObj(id.getAsLong());
}
#Override
public void write(JsonWriter writer, T obj) throws IOException {
delegate.write(writer, obj);
}
};
}
}
I haven't fully tested it yet and I'll get back and revise it if needed. (Posting it now to open up for feed back on the approach.)
I am using aspectj to add some field to a existing class and annotate it also.
I am using load time weaving .
Example :- I have a Class customer in which i am adding 3 string attributes. But my issues is that I have to set some values and get it also before my business call.
I am trying the below approach.
In my aj file i have added the below, my problem is in the Around pointcut , how do i get the attribute and set the attribute.
public String net.customers.PersonCustomer.getOfflineRiskCategory() {
return OfflineRiskCategory;
}
public void net.customers.PersonCustomer.setOfflineRiskCategory(String offlineRiskCategory) {
OfflineRiskCategory = offlineRiskCategory;
}
public String net.customers.PersonCustomer.getOnlineRiskCategory() {
return OnlineRiskCategory;
}
public void net.customers.PersonCustomer.setOnlineRiskCategory(String onlineRiskCategory) {
OnlineRiskCategory = onlineRiskCategory;
}
public String net.customers.PersonCustomer.getPersonCommercialStatus() {
return PersonCommercialStatus;
}
public void net.customers.PersonCustomer.setPersonCommercialStatus(String personCommercialStatus) {
PersonCommercialStatus = personCommercialStatus;
}
#Around("execution(* net.xxx.xxx.xxx.DataMigration.populateMap(..))")
public Object invoke(ProceedingJoinPoint joinPoint) throws Throwable {
Object arguments[] = joinPoint.getArgs();
if (arguments != null) {
HashMap<String, String> hMap = (HashMap) arguments[0];
PersonCustomer cus = (PersonCustomer) arguments[1];
return joinPoint.proceed();
}
If anyone has ideas please let me know.
regards,
FT
First suggestion, I would avoid mixing code-style aspectj with annotation-style. Ie- instead of #Around, use around.
Second, instead of getting the arguments from the joinPoint, you should bind them in the pointcut:
Object around(Map map, PersonCustomer cust) :
execution(* net.xxx.xxx.xxx.DataMigration.populateMap(Map, PersonCustomer) && args(map, cust) {
...
return proceed(map, cust);
}
Now, to answer your question: you also need to use intertype declarations to add new fields to your class, so do something like this:
private String net.customers.PersonCustomer.OfflineRiskCategory;
private String net.customers.PersonCustomer.OnlineRiskCategory;
private String net.customers.PersonCustomer.PersonCommercialStatus;
Note that the private keyword here means private to the aspect, not to the class that you declare it on.
I am loading an IronPython script from a database and executing it. This works fine for simple scripts, but imports are a problem. How can I intercept these import calls and then load the appropriate scripts from the database?
EDIT: My main application is written in C# and I'd like to intercept the calls on the C# side without editing the Python scripts.
EDIT: From the research I've done, it looks like creating your own PlatformAdaptationLayer is the way you're supposed to to implement this, but it doesn't work in this case. I've created my own PAL and in my testing, my FileExsists method gets called for every import in the script. But for some reason it never calls any overload of the OpenInputFileStream method. Digging through the IronPython source, once FileExists returns true, it tries to locate the file itself on the path. So this looks like a dead end.
After a great deal of trial and error, I arrived at a solution. I never managed to get the PlatformAdaptationLayer approach to work correctly. It never called back to the PAL when attempting to load the modules.
So what I decided to do was replace the built-in import function by using the SetVariable method as shown below (Engine and Scope are protected members exposing the ScriptEngine and ScriptScope for the parent script):
delegate object ImportDelegate(CodeContext context, string moduleName, PythonDictionary globals, PythonDictionary locals, PythonTuple tuple);
protected void OverrideImport()
{
ScriptScope scope = IronPython.Hosting.Python.GetBuiltinModule(Engine);
scope.SetVariable("__import__", new ImportDelegate(DoDatabaseImport));
}
protected object DoDatabaseImport(CodeContext context, string moduleName, PythonDictionary globals, PythonDictionary locals, PythonTuple tuple)
{
if (ScriptExistsInDb(moduleName))
{
string rawScript = GetScriptFromDb(moduleName);
ScriptSource source = Engine.CreateScriptSourceFromString(rawScript);
ScriptScope scope = Engine.CreateScope();
Engine.Execute(rawScript, scope);
Microsoft.Scripting.Runtime.Scope ret = Microsoft.Scripting.Hosting.Providers.HostingHelpers.GetScope(scope);
Scope.SetVariable(moduleName, ret);
return ret;
}
else
{ // fall back on the built-in method
return IronPython.Modules.Builtin.__import__(context, moduleName);
}
}
Hope this helps someone!
I was just trying to do the same thing, except I wanted to store my scripts as embedded resources. I'm creating a library that is a mixture of C# and IronPython and wanted to distribute it as a single dll. I wrote a PlatformAdaptationLayer that works, it first looks in the resources for the script that's being loaded, but then falls back to the base implementation which looks in the filesystem. Three parts to this:
Part 1, The custom PlatformAdaptationLayer
namespace ZenCoding.Hosting
{
internal class ResourceAwarePlatformAdaptationLayer : PlatformAdaptationLayer
{
private readonly Dictionary<string, string> _resourceFiles = new Dictionary<string, string>();
private static readonly char Seperator = Path.DirectorySeparatorChar;
private const string ResourceScriptsPrefix = "ZenCoding.python.";
public ResourceAwarePlatformAdaptationLayer()
{
CreateResourceFileSystemEntries();
}
#region Private methods
private void CreateResourceFileSystemEntries()
{
foreach (string name in Assembly.GetExecutingAssembly().GetManifestResourceNames())
{
if (!name.EndsWith(".py"))
{
continue;
}
string filename = name.Substring(ResourceScriptsPrefix.Length);
filename = filename.Substring(0, filename.Length - 3); //Remove .py
filename = filename.Replace('.', Seperator);
_resourceFiles.Add(filename + ".py", name);
}
}
private Stream OpenResourceInputStream(string path)
{
string resourceName;
if (_resourceFiles.TryGetValue(RemoveCurrentDir(path), out resourceName))
{
return Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName);
}
return null;
}
private bool ResourceDirectoryExists(string path)
{
return _resourceFiles.Keys.Any(f => f.StartsWith(RemoveCurrentDir(path) + Seperator));
}
private bool ResourceFileExists(string path)
{
return _resourceFiles.ContainsKey(RemoveCurrentDir(path));
}
private static string RemoveCurrentDir(string path)
{
return path.Replace(Directory.GetCurrentDirectory() + Seperator, "").Replace("." + Seperator, "");
}
#endregion
#region Overrides from PlatformAdaptationLayer
public override bool FileExists(string path)
{
return ResourceFileExists(path) || base.FileExists(path);
}
public override string[] GetFileSystemEntries(string path, string searchPattern, bool includeFiles, bool includeDirectories)
{
string fullPath = Path.Combine(path, searchPattern);
if (ResourceFileExists(fullPath) || ResourceDirectoryExists(fullPath))
{
return new[] { fullPath };
}
if (!ResourceDirectoryExists(path))
{
return base.GetFileSystemEntries(path, searchPattern, includeFiles, includeDirectories);
}
return new string[0];
}
public override bool DirectoryExists(string path)
{
return ResourceDirectoryExists(path) || base.DirectoryExists(path);
}
public override Stream OpenInputFileStream(string path)
{
return OpenResourceInputStream(path) ?? base.OpenInputFileStream(path);
}
public override Stream OpenInputFileStream(string path, FileMode mode, FileAccess access, FileShare share)
{
return OpenResourceInputStream(path) ?? base.OpenInputFileStream(path, mode, access, share);
}
public override Stream OpenInputFileStream(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize)
{
return OpenResourceInputStream(path) ?? base.OpenInputFileStream(path, mode, access, share, bufferSize);
}
#endregion
}
}
You would need to change the constant ResourceScriptsPrefix to whatever your base namespace is where you stored the python scripts.
Part 2, The custom ScriptHost
namespace ZenCoding.Hosting
{
internal class ResourceAwareScriptHost : ScriptHost
{
private readonly PlatformAdaptationLayer _layer = new ResourceAwarePlatformAdaptationLayer();
public override PlatformAdaptationLayer PlatformAdaptationLayer
{
get { return _layer; }
}
}
}
Part 3, finally, how to get a Python engine using your custom stuff:
namespace ZenCoding.Hosting
{
internal static class ResourceAwareScriptEngineSetup
{
public static ScriptEngine CreateResourceAwareEngine()
{
var setup = Python.CreateRuntimeSetup(null);
setup.HostType = typeof(ResourceAwareScriptHost);
var runtime = new ScriptRuntime(setup);
return runtime.GetEngineByTypeName(typeof(PythonContext).AssemblyQualifiedName);
}
}
}
It would be easy to change this to load scripts from some other location, like a database. Just change the OpenResourceStream, ResourceFileExists and ResourceDirectoryExists methods.
Hope this helps.
You can re-direct all I/O to the database using the PlatformAdaptationLayer. To do this you'll need to implement a ScriptHost which provides the PAL. Then when you create the ScriptRuntime you set the HostType to your host type and it'll be used for the runtime. On the PAL you then override OpenInputFileStream and return a stream object which has the content from the database (you could just use a MemoryStream here after reading from the DB).
If you want to still provide access to file I/O you can always fall back to FileStream's for "files" you can't find.
You need to implement import hooks. Here's an SO question with pointers: PEP 302 Example: New Import Hooks
I'd like to do this the right way if possible. I have XML data as follows:
<?xml version="1.0" encoding="utf-8"?>
<XnaContent>
<Asset Type="PG2.Dictionary">
<Letters TotalInstances="460100">
<Letter Count="34481">a</Letter>
...
<Letter Count="1361">z</Letter>
</Letters>
<Words Count="60516">
<Word>aardvark</Word>
...
<Word>zebra</Word>
</Words>
</Asset>
</XnaContent>
and I'd like to load this in (using Content.Load< Dictionary >) into one of these
namespace PG2
{
public class Dictionary
{
public class Letters
{
public int totalInstances;
public List<Character> characters;
public class Character
{
public int count;
public char character;
}
}
public class Words
{
public int count;
public HashSet<string> words;
}
Letters letters;
Words words;
}
}
Can anyone help with either instructions or pointers to tutorials? I've found a few which come close but things seem to have changed slightly between 3.1 and 4.0 in ways which I don't understand and a lot of the documentation assumes knowledge I don't have. My understanding so far is that I need to make the Dictionary class Serializable but I can't seem to make that happen. I've added the XML file to the content project but how do I get it to create the correct XNB file?
Thanks!
Charlie.
This may help Link. I found it useful to work the other way round to check that my xml data was correctly defined. Instantate your dictionary class set all the fields then serialize it to xml using a XmlSerializer to check the output.
You need to implement a ContentTypeSerializer for your Dictionary class. Put this in a content extension library and add a reference to the content extension library to your content project. Put your Dictionary class into a game library that is reference by both your game and the content extension project.
See:
http://blogs.msdn.com/b/shawnhar/archive/2008/08/26/customizing-intermediateserializer-part-2.aspx
Here is a quick ContentTypeSerializer I wrote that will deserialize your Dictionary class. It could use better error handling.
using System;
using System.Collections.Generic;
using System.Xml;
using Microsoft.Xna.Framework.Content.Pipeline.Serialization.Intermediate;
namespace PG2
{
[ContentTypeSerializer]
class DictionaryXmlSerializer : ContentTypeSerializer<Dictionary>
{
private void ReadToNextElement(XmlReader reader)
{
reader.Read();
while (reader.NodeType != System.Xml.XmlNodeType.Element)
{
if (!reader.Read())
{
return;
}
}
}
private void ReadToEndElement(XmlReader reader)
{
reader.Read();
while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
{
reader.Read();
}
}
private int ReadAttributeInt(XmlReader reader, string attributeName)
{
reader.MoveToAttribute(attributeName);
return int.Parse(reader.Value);
}
protected override Dictionary Deserialize(IntermediateReader input, Microsoft.Xna.Framework.Content.ContentSerializerAttribute format, Dictionary existingInstance)
{
Dictionary dictionary = new Dictionary();
dictionary.letters = new Dictionary.Letters();
dictionary.letters.characters = new List<Dictionary.Letters.Character>();
dictionary.words = new Dictionary.Words();
dictionary.words.words = new HashSet<string>();
ReadToNextElement(input.Xml);
dictionary.letters.totalInstances = ReadAttributeInt(input.Xml, "TotalInstances");
ReadToNextElement(input.Xml);
while (input.Xml.Name == "Letter")
{
Dictionary.Letters.Character character = new Dictionary.Letters.Character();
character.count = ReadAttributeInt(input.Xml, "Count");
input.Xml.Read();
character.character = input.Xml.Value[0];
dictionary.letters.characters.Add(character);
ReadToNextElement(input.Xml);
}
dictionary.words.count = ReadAttributeInt(input.Xml, "Count");
for (int i = 0; i < dictionary.words.count; i++)
{
ReadToNextElement(input.Xml);
input.Xml.Read();
dictionary.words.words.Add(input.Xml.Value);
ReadToEndElement(input.Xml);
}
ReadToEndElement(input.Xml); // read to the end of words
ReadToEndElement(input.Xml); // read to the end of asset
return dictionary;
}
protected override void Serialize(IntermediateWriter output, Dictionary value, Microsoft.Xna.Framework.Content.ContentSerializerAttribute format)
{
throw new NotImplementedException();
}
}
}