caller-of | The tiniest yet most powerful JS utility ever : D | Runtime Evironment library
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QUESTION
I have implemented a Plugin mechanism and language packs using ResourceBundles in Java.
It works perfectly fine if I want to get a ResourceBundle from the core program (not from a plugin).
The problem is that I want to add the possibility to create a ResourceBundle that is in the plugin and only works within the plugin.
Plugins are loaded using URLClassLoaders and Reflections. I cannot access (I don't want to) plugin ClassLoaders from the translation class.
So, the program loads the plugin and executes a method inside the plugin later (The plugin is not in the Classpath) and that plugin executes the translate method.
In order to archieve this, I want to get the ClassLoader Object from the calling method.
Somethng like this or this might be useful, but I don't see a way to get the Class/ClassLoader and not the name of the class.
I thought that I could use the Stacktrace to get the ClassLoader of the calling method but I can only get the name using .getClassName and no Class or ClassLoader Object of the Caller.
This is what I have:
translate
...ANSWER
Answered 2019-Jun-18 at 10:46I don’t think that this trial and error approach is a good idea. Neither is refetching all bundles for every single string. It doesn’t even seem that this translation service adds a value over the alternative of just letting the plugin read their bundle and call getString on it, at least not a value that justifies the overhead and complexity of the code.
Since the standard ResourceBundle.getBundle methods do already consider the caller’s context, the field declaration and acquisition expression would be a trivial single-liner when being placed within the plugin and invoking getString on it, is not more complicated than invoking your translation service’s method.
For completeness, getting the caller class in a standard way, is possible starting with Java 9. Then, you can do it like
QUESTION
I'm working on an application with a large number of Remote EJB service methods, and I'd like to have some useful information about the client calling the methods (other than very basic information such as IP address...).
I found this question but it's a bit dated :
How can I identify the client or caller of an EJB within the request?
Is there some kind of custom client context / work area in which I could put the caller details and receive them on server side inside a thread local ?
Basically do I have another option than adding a parameter to every single method of every service ?
...ANSWER
Answered 2019-Jan-21 at 14:58With security enabled you have the possibility to retrieve the current user. This is pretty simple, but probably won't fit all needs.
In general, there is nothing you can use out-of-the-box. Adding some custom parameter is probably the worst option.
JBoss and Wildfly are offering the possibility to use EJB client- and server-side container interceptors. Usage and implementation details depend on the version of your application server.
I implemented this by utilizing the MDC (mapped diagnostic context) of our logging framework to enhance server side logging with caller information. You can think about this like using a ThreadLocal. Of course, you need something like a caller context on the client side holding the specific information. Global remote client data (ip address, ...) can be set within the client interceptor, too.
A coarse overview what I did:
- Configure client- and server-side logging to use additional MDC data
- Enhance client side MDC with key/value data
- Client-side interceptor enxtracts the data from the MDC and puts it on the invocation context
- Server-side interceptor extracts the data from the invocation context and enhances server side MDC
This approach is working, but depending on your application complexity (e.g. with server2server calls, bean2bean calls on local asynch EJBs, ...) complexity increases. Don't forget to think about cleaning up e.g. your ThreadLocal data to avoid possible memory leaks.
QUESTION
The following code searches a graph and returns true or false depending upon the predicate function passed as a parameter.
The graph is represented in the form of an adjacency list.
Assume that the graph does not contain cycles.
Code:
...ANSWER
Answered 2017-Aug-16 at 17:38Caveat for this answer: I see the question as brain-teaser type puzzle; I think the best way to solve this is via approach #1 outlined in the question. But if we assume that we are not allowed to modify search, for whatever reason...
... and we assume that the predicate? that we pass in is allowed to maintain state and make calls to the lookup that is used in search (and is our essential representation for the graph), ...
then I think one can accomplish your goal, by having the predicate? keep track on its own of the hop-counts for all of the nodes that it has encountered.
Then, it can just query that hop-count table whenever it wants to know whether the node it has encountered is too far away.
Here's the code I've made to illustrate this:
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