kandi X-RAY | TaskExecutor Summary
kandi X-RAY | TaskExecutor Summary
The TaskExecutor is an implementation of a robust, consolidated, and centralized asynchronous Task execution framework. Tasks are persisted to disk, accommodate configurationChanges, new Activity creation, and even survive process termination. With many options, your Tasks are almost guaranteed to execute, and post back directly to the current activity via a hard callback.
Top functions reviewed by kandi - BETA
- Region TaskTracker
- Inflates a task
- Unmarshall a file
- Inflates the queued items in the queue
- Gets the task executor reference
- Post completed tasks
- Sets the dirty state
- Invoked when the command is started
- Called when autoExecution is enabled
- Force load
- Returns the number of items currently in the queue
- Marks the queue modification
- Called periodically to update tasks
- Post an update to the UI thread
- Notify all tasks that have been restored
- Gets the task executor
- Run the task
- Add a task to the queue
- Clean the autoexec task
- Set the thread pool to use
- Find a Task that has the specified TAG
- Clears the queue
- Start loading
- Stops the loading
- Resume the executor
- Clean up task executor
TaskExecutor Key Features
TaskExecutor Examples and Code Snippets
Trending Discussions on TaskExecutor
Latest Update (with an image to hope simplify the problem) (thanks for feedback from @Mahmoud)
Relate issue reports for other reference (after this original post created, it seem someone filed issues for Spring Cloud on similar issue, so also update there too):
https://github.com/spring-cloud/spring-cloud-task/issues/793 relate to approach #1
https://github.com/spring-cloud/spring-cloud-task/issues/792 relate to approach #2
Also find a workaround resolution for that issue and update on that github issue, will update this once it is confirmed good by developer https://github.com/spring-cloud/spring-cloud-task/issues/793#issuecomment-894617929
I am developing an application involved multi-steps using spring batch job but hit some roadblock. Did try to research doc and different attempts, but no success. So thought to check if community can shed light
Spring batch job 1 (received job parameter for setting for step 1/setting for step 2)...
ANSWERAnswered 2021-Aug-15 at 13:33
- Is above even possible setup?
yes, nothing prevents you from having two partitioned steps in a single Spring Batch job.
- Is it possible to use JobScope/StepScope to pass info to the partitionhandler
yes, it is possible for the partition handler to be declared as a job/step scoped bean if it needs the late-binding feature to be configured.
Updated on 08/14/2021 by @DanilKo
The original answer is correct in high - level. However, to actually achieve the partition handeler to be step scoped, a code modification is required
Below is the analyze + my proposed workaround/fix (maybe eventually code maintainer will have better way to make it work, but so far below fix is working for me)
Issue being continued to discuss at: https://github.com/spring-cloud/spring-cloud-task/issues/793 (multiple partitioner handler discussion) https://github.com/spring-cloud/spring-cloud-task/issues/792 (which this fix is based up to use partitionerhandler at step scope to configure different worker steps + resources + max worker)Root cause analyze (hypothesis)
The problem is DeployerPartitionHandler utilize annoation @BeforeTask to force task to pass in TaskExecution object as part of Task setup
But as this partionerHandler is now at @StepScope (instead of directly at @Bean level with @Enable Task) or there are two partitionHandler, that setup is no longer triggered, as
@EnableTask seem not able to locate one
partitionhandler during creation.
Resulted created DeployerHandler faced a null with
taskExecution when trying to launch (as it is never setup)
Below is essentially a workaround to use the current job execution id to retrieve the associated task execution id From there, got that task execution and passed to deploy handler to fulfill its need of taskExecution reference It seem to work, but still not clear if there is other side effect (so far during test not found any)
In the partitionHandler method
I am trying to add some unit tests to my app and I am finding some problems adding tests to my ViewModel's classes.
I have created a standard ViewModel class using the
androidx. lifecycle library.
Inside these ViewModel classes, I launch a Coroutine to make an API call and retrieve some data.
For this, I have created a ViewModel extension function just to call a Use Case to finally make the API call....
ANSWERAnswered 2022-Mar-17 at 15:28
Okay, so I find out the problem. I was using a solution for JUnit 4, not for the JUnit 5 library.
- The extension I have created was right, whenever we use LiveData objects, we should update LiveData objects immediately.
- How I was setting up the Coroutine scope for test cases, it was wrong. I was using a solution for JUnit 4 but I should modify the code to make the same but for JUnit5.
How to manage access to shared resources using Project Reactor?
Given an imaginary critical component that can execute only operation at the time (file store, expensive remote service, etc), how could one orchestrate in reactive manner access to this component if there are multiple points of access to this component (multiple API methods, subscribers...)? If the resource is free to execute the operation it should execute it right away, if some other operation is already in progress, add my operation to the queue and complete my Mono once my operation is completed.
My idea is to add tasks to the flux queue which executes tasks one by one and return a Mono which will be complete once the task in the queue is completed, without blocking....
ANSWERAnswered 2022-Feb-23 at 10:26
this looks like a simplified version of what the reactor-pool does, in essence. have you considered using that with eg. a maximum size of 1?
The pool is probably overkill, because it has the overhead of having to deal with multiple resources on top of multiple competing borrowers like in your case, but maybe it could provide some inspiration for you to go further.
I have a local MongoDB replica set created following this SO answer.
The docker-compose file:...
ANSWERAnswered 2021-Aug-06 at 00:45
There are some partial answers on this issue from various places, here is what I think as a complete answer.The Cause
Although the connection string is
"mongodb://localhost:27017,localhost:27018,localhost:27019/?replicaSet=rs", mongo client does not connect to the members of the replica set with seed addresses
localhost:27017etc, instead the client connects to the members in the replica config set returned from the seed hosts, i.e., the ones in the
rs.initiatecall. This is why the error message is
Error connecting to mongo1:27017instead of
Error connecting to localhost:27017.
Container hostnames are not addressable outside the container network
A mongo client inside the same container network as the mongo server containers can connect to the server via addresses like
mongo1:27017; however, a client on the host, which is outside of the container network, can not resolve
mongo1to an IP. The typical solution for this problem is proxy, see Access docker container from host using containers name for details.
Because the problem involves docker networking and docker networking varies between Linux and Mac. The fixes are different on the two platforms.Linux
The proxy fix (via 3rd party software or modifying
/etc/hosts file) works fine but sometimes is not viable, e.g., running on remote CI hosts. A simple self-contained portable solution is to update the
intiate_replia_set.sh script to initiate the replica set with member IPs instead of hostnames.
As per spring documentation for
Set whether to wait for scheduled tasks to complete on shutdown
Does it mean that if any task is stuck on some long running process and we explicity try to stop the container, it will not be terminated untill that task is finished?...
ANSWERAnswered 2021-Oct-08 at 18:11
Short answer? Yes
On shutdown ( either by hitting by a request to the shutdown end point or by calling applicationcontext.close ) by default, Spring's TaskExecutor simply interrupts all running tasks.
Note that your threads must be in an interruptible state (e.g. sleep) to actually be interrupted.
In some cases you may want to wait for all running tasks to be complete.
calling setWaitForTasksToCompleteOnShutdown(true) simply prevents interrupting the running tasks on shutdown and ensures that both the currently executing tasks and queued up tasks are completed.
( I assume this is because they are non-daemon threads that prevent application exit. )
In short, the answer to your question is yes.
You can play with the following piece of code. When you change setWait from false to true, you will see that the application will not exit until the sleep is over. When you set it to false, the application will terminate immediately.
I've the following error whith SpringBatch :...
ANSWERAnswered 2021-Sep-16 at 08:48
There are two key parameters here: the size of your worker threads pool and the size of your datatbase connection pool.
If each thread requests a database connection and you have more workers than available connections, then at some point worker threads will wait for connections to become available. This wait could timeout if no connections are released before the configured timeout value.
So you need to make sure you have enough connections for your worker threads, or increase the timeout in your connection pool.
ANSWERAnswered 2021-Aug-19 at 14:17
The difficulty that you are having is getting a good mapping from the image in the ImageProxy to what is displayed by the PreviewView. Although this sounds easy, I don't believe there is straightforward way to do this mapping. See the answer to a similar question. I took a look at implementing each of the suggestions in this answer and, although they worked in some situations, they failed in others. Of course, I could have taken the wrong approach.
I have come to the conclusion that extracting and analyzing a bitmap extracted from the preview area and identifying those words that are completely enclosed by the red rectangle is the simplest. I circumscribe those words with their own red rectangle to show that they have been correctly identified.
The following is the reworked activity, a graphic overlay the produces the word boxes and the XML for the display. Comments are in the code. Good luck!
I've got a problem with this integration. I use MongoDB based on docker without problems, but when I create a Docker Compose, the Spring Boot WebFlux stop to find the Mongo. I'm trying to find the problem, but I don't know how to solve it.
The service log shows me this problem:...
ANSWERAnswered 2021-Aug-05 at 15:30
So what exactly is the problem here? Without knowing more about the application, I can't really tell why it's trying
localhost first, but it seems like it's able to connect to mongo running on the
person-db container after that based on these logs:
I am using Spring SchedulingConfigurer and CronTrigger to trigger a job at every 5 minutes but code is not working as expected....
ANSWERAnswered 2021-Aug-09 at 15:47
Finally I got the solution with the help of CronMaker.
I'd like to try a project I found on GitHub, so I installed MongoDB on MacOS and now I'm trying to understand how to set up it correctly through the docker compose file in the directory. This is the docker file:...
ANSWERAnswered 2021-Jul-28 at 21:28
So here is an attempt at helping.. For the most part, the docker compose yaml file is pretty close, with exception of some minor port and binding parameters. There is an expectation that initialization will be additional commands. Example:
- docker-compose up the environment
- run some scripts to init the environment
... but this was already part of the original post.
So here is a docker compose file
No vulnerabilities reported
You can use TaskExecutor 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 TaskExecutor 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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