adamant | ADAMANT Blockchain Node | Cryptography library
kandi X-RAY | adamant Summary
kandi X-RAY | adamant Summary
ADAMANT is a decentralized blockchain messaging platform. Applications use ADAMANT as an anonymous and encrypted relay and storage to enable messaging features. As examples, see Messenger app, Blockchain 2FA and Decentralized cryptocurrency exchanger implementations. For more information refer to ADAMANT website:
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QUESTION
We have a requirement to create Streams in Spring Cloud Dataflow that retrieve data from an Oracle database. However, as documented, Dataflow doesn't come pre-packaged with the Oracle drivers. We're currently deploying the application with a custom Helm chart to Kubernetes. We've tried the following:
- Added the jar to the /lib/ directory
- Added the jar to another directory and set the CLASSPATH environment variable to ".:/libs/ojdbc10.jar"
- Tried to specify the location in the LOADER_PATH variable
All the documentation suggests that we more than likely need to roll our own version of Spring Cloud Dataflow. However, if we do that we will lose the ability to utilize the Kubernetes default deployer. And my employer is adamantly opposed to doing much development.
Is there a way to add the Oracle driver to the classpath WITHOUT rolling our own version of Spring Cloud Dataflow? Is there any directory out there that will dynamically add the driver to Spring?
...ANSWER
Answered 2021-May-14 at 21:51The most common approach at customers/community is that you pull the GA-released tag from the SCDF repo, add your desired licensed DB driver dependency, and build it for your use.
If that is impossible for your ORG, there's another procedure in our docs — see under Add a JDBC Driver (Optional)
section.
QUESTION
I've recently heard about a company using a surprising architecture pattern of a stand alone /independent API (access layer) between a very poorly structured SQL Server and their front end, such that NO entity framework is used anywhere as well as having no direct interaction with the DB from the front end.
I've never seen this before in a .Net Core/Framework environment and comes across as a plaster type situation where they are trying to abstract away the poor DB structure and hide it from the consumer via the API, instead of fixing the core issue, which is the poor DB.
Is this considered an actual architecture pattern or best practice (in this situation even perhaps?) or is this just a mess? The development team seems adamant on this new API pattern...
...ANSWER
Answered 2021-Feb-10 at 15:38It is standard practice to abstract the front end from the database. Layers of abstractions make render data transport objects that differ wildly from the entity models in the database. This insulating layer provides a set standard for actors attempting to access the data and encapsulates business logic in a central location. This is a smart decision. As the database standards are improved, the API calls to the database can be updated without affecting the front end. Thus, front end developers need not be bothered with schematic database changes. Entity Framework is not a pre or co requisite for c# projects communicating with databases. There are many ORM libraries out there and some stacks don't even leverage one. While EF is powerful, if the database is a mess, it may be prudent to delay implementation of any ORM until the data and schema is sufficiently curated.
QUESTION
I'm doing some experimenting with y-combinator-like lambda wrapping (although they're not actually strictly-speaking y-combinators, I know), and I've encountered a very odd problem. My code operates exactly as I'd anticipate in a Debug configuration (with Optimizations turned off), but skips large (and important!) bits in Release (with it set to Optimizations (Favor Speed) (/Ox)
).
Please note, the insides of the lambda functions are basically irrelevant, they're just to be sure that it can recursion correctly etc.
...ANSWER
Answered 2021-Feb-04 at 18:14Undefined behavior is a non-localized phenomenon. If your program encounters UB, that means the program's behavior in its entirety is undefined, not merely that little part of it that did the bad thing.
As such, it is possible for UB to "time travel", affecting code that theoretically should have executed correctly before doing UB. That is, there is no "correctly" in a program that exhibits UB; either the program is correct, or it is incorrect.
How far that goes depends on the implementation, but as far as the standard is concerned, VS's behavior is consistent with the standard.
QUESTION
I have a wrapper function that runs multiple subroutines. Instead defining the wrapper function to take hundreds of inputs that would pass to each subroutine, I would like the wrapper function to read an input file containing all the arguments to be passed to each subroutine.
For example, given an input file called eg_input.py
:
ANSWER
Answered 2021-Jan-08 at 19:12You can supply a dictionary for global variables in exec
. Any globals defined in the executed code end up there. Now, when you call your functions, read the values from that dict. Since class instances already have a dict, you could write the wrapper as a class that updates class instances from the file and then you can write any number of instance methods to run your code.
QUESTION
I'm making a PoC app that will deal with uploading a vast amounts of data to Google Drive via their File Stream app (DFS).
The subject of my concern is how the File Stream deals with uploading the files specifically. Upon my research, I gathered that when you copy the file to the Google Drive (I mean the file system, typically G:
), it is actually copied to the application's cache (typically %LOCALAPPDATA%/Google/DriveFS
), where it sits so the app can do all the uploading. That's fine, and it is also logical that when you want to copy, say, 100 GB of data while having only 50 GB of disk space available it will scream for more disk space. However, I still want to upload these 100 GB. Obviously, the solution is to split it into chunks and then copy them accordingly, but here is my question: how will I be able to know if the DFS finished uploading the previous chunk, so I can then copy another?
I made some experiments with uploading two ~2.5 GB files, starting the upload with a couple of minutes interval, so that I can inspect the DFS cache's size and it roughly matched the expected: before anything it was a couple of MB, after I copied the first it rose up by about 2.5 GB, after the second it rose again by the similar amount. Everything as expected. Now, I anticipated that after it was done with uploading the first file, the cache would shrink down again by the file's size, but to my surprise - nothing changed. It stood adamant, even after the second file finished. So that's where my question comes from - How would I go with uploading the data chunk by chunk? I really, really don't want to call the GDrive API to see if the files were uploaded; I'm using the DFS so that I don't have to include any authorization mess into that.
Any insight will be helpful. Oh, and I'm developing this is Python, but this is not entirely relevant to the question.
...ANSWER
Answered 2020-Dec-07 at 08:06After investigating and some trial and error I came up with the solution that works. Based on this answer, I copy a chunk of files (say, 10 of them), and them periodically check their md5 checksum property on the DFS to compare with the locally calculated one, until all the files from the chunk checks:
QUESTION
I am stuck on a programming assignment in C. The user has to enter a number specifying the size of an array no bigger than 10 elements which will store the names of students. This must be done in a separate function from the main function called getNames. Each name can be up to 14 characters and getNames must be invoked from within the main function. Here is my code:
...ANSWER
Answered 2020-Oct-31 at 18:33you can do following
- Method
in main
function call as below
QUESTION
We have an app aimed at Android TV and it has been published live but it comes up as not being compatible with any device in the Google Play Store and I cannot find/install it on an Android TV device, I think Google has done something wrong but I'm getting nothing from them other than copy/paste responses.
The only thing they've said is that it doesn't contain the following :
...ANSWER
Answered 2020-Oct-28 at 23:59The app won't show as available on TV devices until it has passed the manual review process.
The uses-feature parts of your manifest look correct, but it looks like you're using your app icon as the banner. This won't show up correctly in the ATV launcher, which may be why they're incorrectly calling out the leanback requirement. The banner should be an xhdpi resource with a size of 320 x 180 px. The app name as text must be included in the image. If your app is available in more than one language, you must provide separate versions of the banner with text for each supported language.
See https://developer.android.com/training/tv/start/start#banner for more info.
For the screenOrientation on TV, you should generally either leave it undefined or specify landscape. I'm not sure what impact (if any) setting it to full sensor has given that there isn't an accelerometer for the system to rely on.
QUESTION
The Json POST request looks like this:
...ANSWER
Answered 2020-Oct-22 at 14:32Your Actor class needs to implement Serializable.
QUESTION
I have a system set up in Microsoft Azure where an Azure VM connects to Azure Blob store and downloads a file for processing. A new output file is generated and the uploaded back into the Azure Blob Store. The output file is several orders of magnitude larger than the input file.
The Azure VM accesses the blob storage through an endpoint like:- "https://xxxxxx.blob.core.windows.net/". Where xxxxxx is the blob store name, redacted for privacy.
My question is, when I upload the output file into the Azure Blob store through that endpoint, does the traffic from the VM count as egress to the internet? I.e. is it chargable? I have trawled through the documentation on the Microsoft Website and even spoken directly with a Microsoft Sales representative and I get conflicting information.
For example you can see this on the MS Website:- Azure Screenshot. But the MS representative was adamant that it would be charged. Obviously this has huge implications on cost for us. In fact, as ingress traffic is free, it may even prove cheaper to host the application outside the Azure cloud!
So, can someone set me straight, will this bandwidth be chargeable? If so, is there a way to avoid this charge? Through some special VNet peering or something?
Thanks Stack Overflow Community!
...ANSWER
Answered 2020-Aug-21 at 02:28I would say it depends of the region, if both VM and blob are really in the same region, and specially in the same vnet and availability zone it shouldn't be charged.
My recommendation is to test and if it happens to be charged you could open a support request to get the details, they will explain to you why it was charged and if there is a workaround.
QUESTION
I am seeking out the right collection type to achieve this result in C#. I am wanting to create a List of Items, from a couple of enum fields I've pre-specified.
- itemType
- itemMaterial
For every itemType I add, I would like for a new set of items to be created that follows this general pattern, (ripped from Runescape for ease of concept conveyance, don't come after me JaGex):
...ANSWER
Answered 2020-Sep-06 at 08:09No need for a specific collection. Just declare the item class and create all permutations.
Choosing a collection would be needed if you had specific requirements like quick access, fast iterations, one item pointing to another and more.
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Install adamant
For new droplets, use the Installation script, included in this repository, or run it from the ADAMANT website:. The script updates Ubuntu packages, creates user named adamant, installs PostgreSQL, Node.js and other necessary packages, sets up ADAMANT node, and optionally downloads up-to-date ADAMANT blockchain image.
-b: choose GitHub branch for node installation. Example: -b dev. Default is master.
-n: choose mainnet or testnet network. Example: -n testnet. Default is mainnet.
Clone the ADAMANT repository using Git and initialize the modules.
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