lock | 分布式锁:redis和zookeeper实现 | Messaging library
kandi X-RAY | lock Summary
kandi X-RAY | lock Summary
lock
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Top functions reviewed by kandi - BETA
- Lock a key
- Check if lock is reentrant
- Wrap the lock key
- Set nx value
- Set redis template
- Sets the serializer
- Around lock point
- Returns the unique key for the join point
- Start the Redis lock application
- The client
- Release lock with script
- Unlock a key
- Request hello
- Initialize Redis script
- Require a lock
- Generate lock with Lua script
- Require lock with a lock
- Release lock
- The entry point
lock Key Features
lock Examples and Code Snippets
Community Discussions
Trending Discussions on lock
QUESTION
I wanted to insert my data to a specific sheet name based on form input value of "svdate":
...ANSWER
Answered 2021-Jun-16 at 02:12I thought that in your situation, it is required to retrieve 6/17
from 06/17/2021
. For this, how about the following modification?
In this case, please modify doPost
as follows.
QUESTION
Would be great if someone can help me understand how flock functions. Lets says I have the below scenario:
...ANSWER
Answered 2021-Jun-16 at 02:07I tried testing this scenarios with a working example script and I found that the waiting jobs are processed in a random manner.
QUESTION
I was following along with this tutorial on creating a concurrent counter struct for a usize
value: ConcurrentCounter
. As I understand it, this wrapper struct allows us to mutate our usize
value, with more concise syntax, for example:my_counter.increment(1)
vs. my_counter.lock().unwrap().increment(1)
.
Now in this tutorial our value is of type usize
, but what if we wanted to use a f32
, i32
, or u32
value instead?
I thought that I could do this with generic type arguments:
...ANSWER
Answered 2021-Jun-15 at 23:55I haven't come across such a ConcurrentCounter
library, but crates.io is huge, maybe you find something. However, if you are mostly concerned with primitives such as i32
, there is a better alternative call: Atomics, definitely worth checking out.
Nevertheless, your approach of generalizing the ConcurrentCounter
is going in a good direction. In the context of operation overloading, std::ops
is worth a look. Specifically, you need Add
, Sub
, and Mul
, respectively. Also, you need a Copy
bound (alternatively, a Clone
would also do). So you were pretty close:
QUESTION
I encountered the following error when I tried to install some new packages using npm install
. It happened when I did npm install a-new-package --save
and then delete package-lock.json file afterwards to refresh everything.
ANSWER
Answered 2021-Jun-15 at 18:59May be deleting node_modules
folder and package-lock.json
file and then reinstalling npm
would resolve your issue.
So, consider the following commands to apply the above operations:
QUESTION
I am querying a database for an item using R2DBC and Spring Integration. I want to extend the transaction boundary a bit to include a handler - if the handler fails I want to roll back the database operation. But I'm having difficulty even establishing transactionality explicitly in my integration flow. The flow is defined as
...ANSWER
Answered 2021-Jun-15 at 18:32Well, it's indeed not possible that declarative way since we don't have hook for injecting to the reactive type in the middle on that level.
Try to look into a TransactionalOperator
and its usage from the Java DSL's fluxTransform()
:
QUESTION
I have a generator object, that loads quite big amount of data and hogs the I/O of the system. The data is too big to fit into memory all at once, hence the use of generator. And I have a consumer that all of the CPU to process the data yielded by generator. It does not consume much of other resources. Is it possible to interleave these tasks using threads?
For example I'd guess it is possible to run the simplified code below in 11 seconds.
...ANSWER
Answered 2021-Jun-15 at 16:02Send your data to separate processes. I used concurrent.futures because I like the simple interface.
This runs in about 11 seconds on my computer.
QUESTION
I am attempting to write a a UI test that taps on a delivered local notification after the device has been locked. I have been successful so far in tapping on a notification that was delivered on the springboard (when the device is already unlocked) but not from the lock screen. Does anyone know if this is possible?
Please note that this is different from questions such as this one, which merely hit the home button to leave the app under test and wait for the notification.
Here is the relevant portion of my test code:
...ANSWER
Answered 2021-Jun-15 at 14:49I have similar issues, and I was able to resolve them by Adding a press lock Again. Here is the working code. I am using https://github.com/pterodactyl for Notifications. I wrote this code a couple of years back and still passing.
I do the same thing twice and able to validate notifications. Once the device is locked. You will see a black screen like it is turned off, and the second time when you will send the same code, it will turn on the device, and you can get notifications element for tests
// Lock the screen
XCUIDevice.shared.perform(NSSelectorFromString("pressLockButton"))
sleep(1)// same command second time ,it will wake the screen
XCUIDevice.shared.perform(NSSelectorFromString("pressLockButton"))
QUESTION
I am trying to understand the example with incorrect sync code from The Go Memory Model.
...Double-checked locking is an attempt to avoid the overhead of synchronization. For example, the twoprint program might be incorrectly written as:
ANSWER
Answered 2021-Jun-14 at 19:18According to the Go memory model:
There are no guarantees that one goroutine will see the operations performed by another goroutine unless there is an explicit synchronization between the two using channels, mutex. etc.
In your example: the fact that a goroutines sees done=true
does not imply it will see a
set. This is only guaranteed if there is explicit synchronization between the goroutines.
The sync.Once
probably offers such synchronization, so that's why you have not observed this behavior. There is still a memory race, and on a different platform with a different implementation of sync.Once
, things may change.
QUESTION
So I am relatively new to programming, and I have been working on this task app, where I want to save the data such as task name and more, given by the user. I am trying to accomplish this using Room. Now, initially, when I tried to do it, the app would crash since I was doing everything on the main thread probably. So, after a little research, I came to AsyncTask, but that is outdated. Now finally I have come across the Executer. I created a class for it, but I am a little unsure as to how I can implement it in my app. This is what I did :
Entity Class :
...ANSWER
Answered 2021-Jun-14 at 12:03First make a Repository class and make an instance of your DAO
QUESTION
I made a node JS application using Hapi on Windows 10. After testing it locally, the script start
would run without any problem. here is the start script inside the package.json
ANSWER
Answered 2021-Jun-15 at 10:13You need to quote the *
: nodemon -e "*" src/server.js
.
Unlike Windows' cmd, Linux shells expand wildcards (as you can see in the command actually run, above the error). In Windows it's up to the program you are calling to expand wildcards. Since that is what you want in case of nodemon, it worked "by chance" on Windows without escaping the asterisk because it doesn't have any special meaning to cmd, but in Linux it will get expanded and that's not what you want.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install lock
You can use lock like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the lock component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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