SpringCloud/spring-cloud-task
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Prevent a task from starting if an inst with the same name is running.

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resolves #81

Using LockRegistryLeaderInitiator to do leadership election.

When task is started and singleInstanceEnabled isset to true then we use leader election
to determine if a task needs to be started.

Error Event Name had to be updated
This commit is contained in:
Glenn Renfro
2017-09-27 17:39:29 -04:00
committed by Michael Minella
parent 94e074d841
commit d8a73ba183
19 changed files with 628 additions and 5 deletions
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27
spring-cloud-task-docs/src/main/asciidoc/features.adoc
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@@ -344,3 +344,30 @@ will be stored in the repo, else if a failure occurs then the `exitMessage` from
the `onTaskFailed` will be stored. Also if a user sets the `exitMessage` with a
`onTaskEnd` listener then the `exitMessage` from the `onTaskEnd` will supersede
the exit messages from both the `onTaskStartup` and `onTaskFailed`.
=== Restricting Spring Cloud Task Instances
Allows a user to establish that only one task with a given task name can be run
at a time. To do this the user establishes the <<features-task-name, task name>>
and sets `spring.cloud.task.singleInstanceEnabled=true` for each task execution.
While the first task execution is running, any other time user tries to run
a task with the same <<features-task-name, task name>> and
`spring.cloud.task.singleInstanceEnabled=true` the task will fail with the following
error message `Task with name "application" is already running.` The default
for `spring.cloud.task.singleInstanceEnabled` is `false`.
```
spring.cloud.task.singleInstanceEnabled=<true or false>
```
In order for this feature to be used you must include the following Spring
Integration dependencies to your application:
[source,xml]
---
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-jdbc</artifactId>
</dependency>
---