ShedLock | Distributed lock for your scheduled tasks | Job Scheduling library
kandi X-RAY | ShedLock Summary
kandi X-RAY | ShedLock Summary
ShedLock makes sure that your scheduled tasks are executed at most once at the same time. If a task is being executed on one node, it acquires a lock which prevents execution of the same task from another node (or thread). Please note, that if one task is already being executed on one node, execution on other nodes does not wait, it is simply skipped. ShedLock uses an external store like Mongo, JDBC database, Redis, Hazelcast, ZooKeeper or others for coordination.
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Top functions reviewed by kandi - BETA
- Attempt to acquire a lock
- Try to lock a node
- Checks if the data is locked
- Creates a node
- Attempt to lock the map with the given configuration
- Add a new lock
- Try to lock the given configuration
- Locks document
- Inserts a document in the database
- Blocking lock
- Updates the lock
- Locks a single lock
- Intercept the method invocation
- Creates a simple lock
- Attempts to create a new lock
- Creates the parameters from the lock configuration
- Post process the bean definition registry
- Creates parameters from a lock configuration
- Extend a lock
- Inserts a record in the table
- Extends the lock
- Non - blocking lock
- Updates record
- Attempts to lock an object
- Attempts to start a SimpleLock with the given lock configuration
- Attempts to lock a single object
ShedLock Key Features
ShedLock Examples and Code Snippets
Community Discussions
Trending Discussions on ShedLock
QUESTION
I want to disable ShedLock with a configuration yml property. So i don't have to create the table shedlock, if it is not necessary. Is there a way to disable Shedlock usage?
I tried to remove @Bean lockProvider but then I got this message:
...No qualifying bean of type 'net.javacrumbs.shedlock.core.LockProvider
ANSWER
Answered 2022-Jan-10 at 12:49If you are using ShedLock in combination with the shedlock-spring dependency, there probably is a @EnableSchedulerLock somewhere in your application. Move the LockProvider bean setup together with the annotation to a separate @Configuration class and add a @ConditionalOnProperty annotation, for example:
QUESTION
I would like to setup Shedlock to guard a sensitive process so that only ONE instance of the process ever runs even when multiple application processes are started.
In my pom.xml
...ANSWER
Answered 2021-Oct-14 at 09:22You need to add @EnableSchedulerLock to your configuration class as per documents : "In order to enable schedule locking use @EnableSchedulerLock annotation"
QUESTION
When running several scheduled tasks on multiple servers, Shedlock seems great, but sometimes, we need to halt some of the tasks for a short or long period too. Of course, it is possible to control each task with additional properties/flags, but my suggestion is to use Shedlock for this too, and introduce a logical "node/server" for the task we wish to stop, and update the row in shedlock-table with a lock to this node, and set a lockedAt time in the future, and a lockUntil to future + 1 second (so longer than maxRunning is not triggered). Then it will start again automatically, or we can go in and move the time further into the future if needed.
Any thoughts on this kind of use for Shedlock... smart or bad practice? It is still used for locking, just locking the job to a logical fake server.
...ANSWER
Answered 2021-Apr-09 at 07:02It is possible to (mis)use ShedLock for this. The update you are looking for can look like this:
QUESTION
Java 8, Spring Boot 2.3.8 and Gradle 6.7 here, and the last time I used Gradle it was on 4.x.
I created a new Java application using Gradle via:
...ANSWER
Answered 2021-Apr-06 at 12:22I figured it out:
QUESTION
I am getting issue from Sonar: "Style - Possible null pointer dereference due to return value of called method. findbugs:NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE. the issue is on lockUntil.after(new Date());
...ANSWER
Answered 2021-Jan-20 at 03:42Assuming that new Date() will never return null should be a valid assumption. My guess is that the possibly null value Sonar is complaining about is lockUntil. I assume that queryForObject will return null if the query does not match any rows, so it makes sense that you'd get a complaint about using lockUntil without first checking if it is null.
QUESTION
I was trying to help out some realtor friends by scraping some data off of realtor.com with beautifulsoup.
I am trying to get a list of the names and phone numbers of the realtors but am getting each as a separate item and there are duplicates for every realtor on the page.
This is what I currently have:
...ANSWER
Answered 2020-Nov-30 at 02:40Well you could use selectors in this way
QUESTION
I came across this challenging scenario wherein the transaction gets locked by Microsfoft sql server while executing a batch update query.
I see this error.
Transaction (Process ID 293) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: Transaction (Process ID 293) was deadlocked on lock resources with another process and has been chosen as the deadlock victim.
My batch update query:
...ANSWER
Answered 2020-Oct-21 at 23:48Is LAST_UPDATED from BATCH_STEP_EXECUTION? (I like to put an alias on every column because it's hard to read otherwise.)
A deadlock will be more likely if it locks more or locks longer. It's important to optimize the query. And if that's not possible, then attempt to use small batch sizes to minimize the size of the transaction.
The first thing I would do is copy the data to a test environment. The first test I would try is to set the date back far enough to exclude any records. If it's slow, then it's doing a scan. A small batch size is not going to help - it might make it much worse.
The WHERE clauses with CAST(LAST_UPDATED as date) < DATEADD(day, -7, GETDATE())) covers the column and a table scan will result even if there is an index. Can you compare LAST_UPDATED directly to a local variable of exactly the same type?
Perhaps check the execution plan. It might indicate a problem.
Another option is to get the IDs first if they are stable enough. Then do the delete in a separate transaction using the table with the data to delete and perhaps a temp table. I would loop through the delete in batches.
If the ID an identity column or otherwise monotonically increasing, get the oldest ID to keep. That should be fast. Then delete all that have a smaller ID. (Be sure this is valid logic.)
Maybe avoid the IN clause? Is this the same result?
QUESTION
i have a spring-boot app, which on production environment runs in 2 instances, resulting in scheduled tasks running twice. to avoid that i'm trying use shedlock, as explained here and here, but it has no affect.
i'm already using a MySql db, to which i added a shedlock table as explained on both of the examples above.
my project's structure is as follows (partially) -
in my application.properties file i have this settings -
ANSWER
Answered 2020-Oct-01 at 12:30well, apparently in my big project there was another config class (besides the AppConfig) - one called SqlSpringConfig, inside the db module.
once i put the LockProvider bean there, all works like a charm
QUESTION
I have implemented a scheduler with shedlock in my current spring project as follows:
...ANSWER
Answered 2020-Aug-20 at 15:44This should do the trick LockAssert.TestHelper.makeAllAssertsPass(true);
Just add it at the beginning of the test method.
QUESTION
I have following scheduled job which runs in multiple instances.
...ANSWER
Answered 2020-Jun-18 at 13:13interface LockService {
bool aquireLock(String lockKey, String value);
bool releaseLock(String lockKey);
}
interface SomeService {
void do();
}
class Scheduler{
@AutoWired LockService lockService;
@Autowired SomeService someService;
@Scheduled(fixedRate = 10000)
public void awesomeJob() throws InterruptedException {
if(lockService.aquireLock("awesomeJob", serverId) ){
try{
//call service method
someService.do();
}catch( Exception e ){
//TODO
}finally{
lockService.releaseLock("awesomeJob");
}
}
}
}
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install ShedLock
You can use ShedLock 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 ShedLock 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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