depends | The missing linker for the JVM | Runtime Evironment library
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The missing linker for the JVM.
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QUESTION
We have a multi-module maven project. One of the modules has a bunch of .proto files, which we compile to java files. Pretty much every other module depends on this module. Most of them use Protobuf 2.4, but one needs to use 2.5.
Is there any nice way to do this? (The not nice way is to edit the pom file to say "2.5", build a jar, manually copy that jar to wherever we need it, and then change the pom file back to 2.4.)
...ANSWER
Answered 2021-Jun-08 at 13:59Never used protobuf, but, as I understand it's a plugin that generate stuff.
So I'm gonna give you generic pointer hoping it will help. I think you should either try to make 2 jar with different classifier from a single module, see https://maven.apache.org/plugins/maven-jar-plugin/examples/attached-jar.html For example classifier proto2.4 and proto2.5 then you can add the classifier when you define the dependency to that module.
Other option I see is having 2 modules, the real one, you have now, and another one for 2.5 Generate a zip from the main one and the second module would be empty but have a dependency on the generated zip, unzip it and then compile with the plugin config for 2.5 Slower at execution, a bit dirtier imho, but can be needed if for example you need more customization than just the version.
QUESTION
While studying OpenCV, I realized that whenever I blend two images the colors of scr2 have changed in some way(depends on the colors of scr1).
I know this is not an informative and clear way to explain my issue, however; I don't know how to describe this issue since I have no expertise with colors so I would like to show you what I meant with images and code.
The input image: Input image
...ANSWER
Answered 2021-Jun-15 at 16:46I think I misunderstood your issue. If your issue is that the image where you do not have lines has changed, then that is because you used a white background for scr2. The white then mixes with your image in the output. Make it scr2=img.copy() in place of what you have now. Then try your code. So in Python/OpenCV as a demonstration, using the Lena image as background, here is your code:
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
I have some local packages hosted on my own machine, I would like to include a copy of them in distribution of other packages that depends on them. When installing a local package, pip freeze shows something like
ANSWER
Answered 2021-Jun-15 at 16:11I managed to do it with source distributions and overriding sdist and egg_info commands to make setuptools bundle local dependencies together with package and to make pip search dependencies in that bundle when installing the built package later. But later I figured out it makes system vulnerable to dependency confusion attacks because local packages installed from that bundle are visible with pip freeze, if for some reason the dependency location, like local-package @ file:///home/user/packages/local-package.tar.gz is stripped to just local-package pip will search it on pypi, which allows dependency confusion to happen.
The best solution for this problem is to vendor all local dependencies where their source code is copied to the package, pip itself vendors its dependencies using vendoring.
QUESTION
I'm getting error message:
...ANSWER
Answered 2021-Jun-15 at 15:54The "GitHub" extension in question should be the microsoft/vscode-pull-request-github, which, in its issues, does not mention anything about active and unknown at all.
I just tested on my VSCode 1.57, and clicking on that link does work.
Try and disable other plugins installed to see if one might cause the issue.
The OP JimBoyLim confirms in the comments:
I finally just reinstalled VSCode, and now its working!
QUESTION
I have a for loop doing something I would have thought relatively straight forward on Python 3
...ANSWER
Answered 2021-Jun-15 at 08:36If I understand correctly, you can't use pd.DataFrame.resample('5 min').mean() out-of-the-box because time_5m isn't at 'normal' positions past the hour (i.e. time_5m is at 2:30, 7:30, ..., 57:30 past the hour.) That is, time_5m is 2.5 minutes offset from the 'normal' positions past the hour (where the 'normal' positions are at 0, 5, 10, ..., 55 minutes past the hour).
Pandas version 1.1 introduced two new keyword arguments for resample(): origin and offset (here are the docs for DataFrame.resample)
So something like this should work:
QUESTION
In the FAQ page of VS Code, there is a clear answer that VS Code itself is free for commercial use. But, are VS Code "Extensions" also free for commercial use?
When I just look over the Marketplace, each Extension is made by a different person/team/company. Therefore, it seems that not all extensions are free for commercial use. (Maybe it depends on the publisher)
Then, how can I check if Extensions are free or not?
More specifically, are "Python"(by Microsoft) and "Python for VSCode"(by Thomas Haakon Townsend) free for commercial use?
...ANSWER
Answered 2021-Jun-15 at 08:00VSCode extensions are considered as "open source" projects, so each one of them would have its own license. Both Microsoft's vscode-python and Thomas Haakon's Python-vscode use MIT License, which allow commercial usage with no problems. Microsoft's new Python language server pylance is not open source, but it allows the usage of any number of copies with Visual Studio or VSCode, according to their license
You can always read the license yourself, or visit choose a license to get a summary of widely used software licenses
QUESTION
if(CanUp){
if(Input.GetKey(KeyCode.W)){
rb.MovePosition(rb.position + Vector2.up * speed * Time.fixedDeltaTime);
if(Input.GetKeyDown(KeyCode.D)){
CanUp = false;
CanRight = true;
}
}else{
CanRight = true;
}
}
if(CanRight){
if(Input.GetKey(KeyCode.D)){
rb.MovePosition(rb.position + Vector2.right * speed * Time.fixedDeltaTime);
if(Input.GetKeyDown(KeyCode.W)){
CanUp = true;
CanRight = false;
}
}else{
CanUp = true;
}
}
ANSWER
Answered 2021-Jun-10 at 10:41Generally, you want to reduce cyclomatic complexity to make debugging and figuring out logic easier. Cyclomatic complexity can usually be identified by having a number of if statements nested inside each other. Try:
QUESTION
What happens if our query contains several tokens that finally there on different nodes? Are possible that the client runs multiple queries Sync or Async on nodes?
sample:
...ANSWER
Answered 2021-Jun-15 at 04:46For Sample 1, just query for single partition and merge results at the client end. This will be much faster. Datastax driver has token aware policy but it will only work when query refers to single partition.
You can refer this link.
For Sample 2, it is an anti pattern query and you cannot expect the client to do all the work for you. If you want to read complete table then you can use spark. Datastax provides spark-cassandra-connector which can provide somewhat same functionality which you have given. Here you can find description of spark-cassandra-connector.
QUESTION
I have a dataset with 'account', 'order_date' and 'amount' columns.
I need to create column "balance" based on the conditions. The tricky part here is current row in "balance" column depends on the previous row of same column which is being created.
Here is Logical explanation:
if amount > 0 then
...ANSWER
Answered 2021-Jun-15 at 03:15Have you tried using Windowing & spark lag function?
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