jjb | chrome extension that helps you automatically apply | Browser Plugin library
kandi X-RAY | jjb Summary
kandi X-RAY | jjb Summary
A chrome extension that helps you automatically apply for Jingdong price protection
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Top functions reviewed by kandi - BETA
- Check page settings
- Logic login login handler
- apply change
- Handle price and price
- update product
- get gold miner
- Update the icon state
- We need to take care after
- Get all orders
- seek price info from platform
jjb Key Features
jjb Examples and Code Snippets
Community Discussions
Trending Discussions on jjb
QUESTION
Please be gentle. I'm a Django newb and I find the level of abstraction just plain overwhelming.
My ultimate goal is to modify an image file on its way into the model. That part may or may not be relevant, but assistance came my way in this post which advised me that I should be making changes inside a validator: REST Django - How to Modify a Serialized File Before it is Put Into Model
Anyway, at the moment I am simply trying to get the context of the request so I can be sure to do the things to the thing only when the request is a POST. However, inside my validator, the self.context is just an empty dictionary. Based on what I have found out there, there should be a value for self.context['request']. Here is what I have:
Serializer with validator method:
...ANSWER
Answered 2022-Mar-06 at 03:15I don't think you need to worry about checking if the request is a POST inside the validate_media()
method. Generally validation only occurs during POST, PATCH, and PUT requests. On top of that, validation only occurs when you call is_valid()
on the serializer, often explicitly in a view, as you do in your post()
function. As long as you never call is_valid()
from anywhere other than post()
, you know that it is a POST. Since you don't support patch()
or put()
in your view, then this shouldn't be a problem.
inside my validator, the self.context is just an empty dictionary
You must explicitly pass in context when creating a serializer for it to exist. There is no magic here. As you can see in the source code context
defaults to {}
when you don't pass it in.
To pass in context, you can do this:
QUESTION
In my application, I am using JNA to use the native code written in C. Where I get the notification from native application in callback.
In callback, I get a pointer and some other data to process. In JNA callback code, I have to use this pointer again to call some other native library code and have to pass that pointer. After that I have to return from this callback.
If I don't call that intermediate native library method from callback, which passes the pointer, it works fine, but if I add this call my application crashes intermittently (mostly after processing few hundred of callback requests, sometimes it run for thousands of callbacks also sucessfully).
This NotificationHook
class objects for which hook is set up in native code is a static variable, as there will be only one hook for the application. And native library call this one by one.
ANSWER
Answered 2022-Jan-10 at 21:50Based on the code you've provided, the problem is the same as other Callback-related questions here: you're losing the native allocation of TRANX
due to Java's garbage collection.
A JNA Structure
consists of two parts: a pointer (to data), and the data itself. You have not provided the native typedef for TRANX
to confirm your JNA mapping, but an instantiated object will have an internal pointer reference, pointing to a 4-byte allocation of memory (the int unused
).
You only show the callback code where TRANX
is already an argument, meaning you've already instantiated it to pass to the callback.
If you allocated it yourself using new TRANX()
or new TRANX(int unused)
, then JNA has
- allocated 4 bytes of native memory
- stored the pointer to it internally
In JNA, the native memory attached to a Structure
is automatically freed as a part of the garbage collection process. This is a common problem with callbacks, as you generally don't control the timing of the callback return, so the following sequence occurs:
- You create the object in Java (allocating the native 4 bytes which the
TRANX
structure tracks the pointer to internally) - You pass the
TRANX
object to the callback - Immediately after passing the object, Java no longer has need for its own object; it is unreachable and thus eligible for garbage collection
- When GC occurs the native 4 bytes are freed as part of the process
- The
TRANX
object in the callback still has the pointer internally, but it now points to memory that is no longer allocated, resulting in theSIGSEGV
(or Invalid Memory Access error, or strange symptoms if the memory is allocated by another thread, or other undefined behavior).
The solution to the problem is to track the memory associated with TRANX
.
- If you are allocating it yourself, keep a reference to the
TRANX
object to prevent it from being unreachable.- This generally requires accessing the
TRANX
structure at some later point after you are sure the callback will have been processed - In JDK9+ a
ReachabilityFence
can be used for this. - In JDK8 you should manipulate the class in some way (e.g., read a value from it, or call toString on it, etc.).
- This generally requires accessing the
- If you are using a native allocation and creating the pointer from the
peer
value returned from the native API, then read the API to determine when that memory is freed.
QUESTION
I'm running puma, sidekiq, and ruby-clock. ruby-clock is invoked with rails runner
. If I do something like restart my database, puma and sidekiq will figure it out and reconnect. But ruby-clock does not. Why is this happening? Are puma and sidekiq somehow instantiating the database pool with a config which allows reconnection?
ANSWER
Answered 2021-Sep-17 at 12:13The answer is that rails runner does not run code within an executor or reloader. Doing so fixed the problem.
QUESTION
I have created a winform:
...ANSWER
Answered 2021-Apr-13 at 10:19Use add_Click()
method rather than Add_Enter()
on a button; moreover, .Close
does not mean .Close()
:
QUESTION
Given the following string
...ANSWER
Answered 2020-May-03 at 03:52You can use the regular expression
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