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QUESTION
A minor irritation when using JNA structures is that they are mutable (and I mean totally mutable) since by default all fields must be public and cannot be final
(though see below). This means that if we would like to expose a JNA structure as a DTO (data transfer object) the client can basically monkey with the data.
Consider this trivial example:
...ANSWER
Answered 2021-May-16 at 20:10Per the JNA API, the final
modifier will make a field read-only with the exception of JNA's read()
method to populate that structure from native memory.
Structure fields may additionally have the following modifiers:
final
JNA will overwrite the field viaread()
, but otherwise the field is not modifiable from Java. Take care when using this option, since the compiler will usually assume all accesses to the field (for a given Structure instance) have the same value. This modifier is invalid to use on J2ME.
The caution regards whether the field can change value; it can if the underlying memory changes and it is re-read. In theory, a user could use this to bypass the read-only nature by:
- Calling the structure's
getPointer()
value - Directly writing to native memory at the appropriate offset
- Calling the structure's
read()
method.
Is this immutable? Probably not, but it's no different than the existing non-modular limitations where reflective access can bypass the final
modifier. It should at least prevent "accidentally" modifying the value, which I think is the intent of immutability.
One possible thought with very little overhead would be subclassing Structure
with something like an ImmutableStructure
where you override read()
; initially it allows reading values into final
fields but then you can change a boolean before returning it to the user, turning read()
into a no-op. This still allows reflective access (like any Java class) but adds a further step preventing unintentional modification.
If you don't want to go that route and want a true defensive copy, you somewhat have to give up the convenience of the Structure API and go low-level and deal directly with the array/buffer of bytes that are returned from native methods. You can do things similar to the Structure
class by calculating field orders, getting offsets of fields (even caching them in a map for later use), and directly reading the byte values at offsets you care about with read-only getters.
Field-by-field copy (or reading from native) via reflection happens under the hood in the Structure's pointer constructor, so creating a defensive copy could be as simple as reading a byte array of the structure's size, creating a new Memory
object and writing those bytes to it, and passing the pointer to that Memory
to the new copy's constructor to use via super(p)
. There are probably more efficient ways to do that.
You might also consider simply serializing the object and deserializing it into a new object.
QUESTION
I wrote a JS code where I imported SheetJS and js-xlsx to perform actions on XLSX files (I can't use nodeJs nor npm, bower or any other solution that requires any installation on final user computer).
Shortly, the code has to do the following:
- gets data that will be added to excel from user;
- imports the excel the user wants to edit;
- use a function to determine in which row data has to be added;
- save and download a new file with updated data
The problem with the code I wrote is that it works just fine with Excels written, in fact, via Excel, but crashes if a user imports an XLSX that was previously generated and downloaded by my code.
Here's a snippet of the code:
...ANSWER
Answered 2021-Mar-20 at 17:59Just in case this could help anyone, I solved my problem changing the IF condition within the FOR loop like this:
QUESTION
I want to implement Twilio
browser to browser call with Symfony5
and ApiPlatform
I'm following this tuto:
I have this function, that's the one I want my TwiML
app to be configured on
ANSWER
Answered 2021-Feb-10 at 23:44Twilio developer evangelist here.
As @Cerad has said in the comments, you need to respond with an object derived from the Symfony Response object.
I haven't used Symfony, so please excuse me if this is wrong, but I think you can update your handler to the following, it might work:
QUESTION
I am trying to understand how to define product in this code after having made some changes to it based on the answer in my previous question Why does WooCommerce Order Shortcode Generate Plugin Notice on Custom Thank You Page?
The notice message have changed and now it asks me to define product. This is the notice:
...ANSWER
Answered 2020-Dec-18 at 10:00To fix the notice
Replace
QUESTION
Consider the following JNA structure:
...ANSWER
Answered 2020-Nov-17 at 17:23You are on the right track pointing out that the auto-read()
is part of the problem here. When you invoke toArray()
you are (usually) changing the memory backing for the array to a new native memory allocation (the auto-allocation zeroes out the memory). So all those 0's are loaded into your array.
The internal Structure toArray()
keeps the values for the first element for your convenience, but does nothing for the remainder, which are instantiated using newInstance()
inside the loop. Here are the two lines causing your problem:
QUESTION
In our project we often use a construct like this (simplified for clarity, we actually use a more safe to use version):
...ANSWER
Answered 2020-Oct-26 at 00:41The problem is that it is not constant initialized. This means that M_INFO_COLLECTION
may be zero-initialized and then dynamically initialized at run time.
Your code generates assembley to set M_INFO_COLLECTION
dynamically because of the "global constructor" (non-constant initialization): https://godbolt.org/z/45x6q6
An example where this leads to unexpected behaviour:
QUESTION
I want to use the TypeScript's Compiler API to experiment with operator overloading in TypeScript code. Specifically, I want to find all instances of x + y
and turn them into op_add(x, y)
. However, I want the language services (eg. IntelliSense in VS Code) to be aware of the transformation and show the correct types.
For example in this code:
...ANSWER
Answered 2020-Aug-05 at 04:31This might be a hacky way but since you already have the modified source code, why not build a new AST from that? For example:
QUESTION
i try to copy a table with Pictures from a WPF Richtextbox to a Forms Richtextbox above clipboard. Both are only code-generated. Not a big Thing, but it will not work.
...ANSWER
Answered 2020-Aug-03 at 12:08ok, finally i use this as a "workaround":
QUESTION
I'm having issue with finding right way to cast my user-defined function in PL/pgSQL into jOOQ code. My user-defined function in PL/pgSQL returns JSON type and I need to somehow adjust/cast it in jOOQ. I've Googled examples, but found none.
Just in case here is my user-defined function in PL/pgSQL:
...ANSWER
Answered 2020-Jun-24 at 09:20From the middle of your question:
QUESTION
Based on this guide, when we want to use HTML attributes, such as readonly
and disabled
which require no values, we should assign a boolean value to the attribute and razor would render the attribute based on the boolean value(not outputting the attribute if boolean is false and vice versa).
Now suppose we have a group of radio inputs and we want the button Clear
to clear the selected radio input so that none of the radio inputs get selected (initial state basically).
ANSWER
Answered 2020-Jun-20 at 10:08This works
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