Handling Ctrl-C Signal in a verticle

[Sumanta Sen]

Hi All,

We have 5 instances of verticle running as part of our application.

To stop the application, we are killing the java process using "kill -9 " command.

Is there a way to catch the signal inside the verticle?

Thanks.

[Tim Fox]

It's not possible to catch a kill -9. The OS doesn't give the process a chance to do this.

Thanks.

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[Sumanta Sen]

Tim,

Is there any better way of gracefully stopping these processes?

Thanks

[Tim Fox]

On 17/08/15 08:30, Sumanta Sen wrote:

Tim,

Is there any better way of gracefully stopping these processes?

You can send a SIGINT (usually CTRL-C does this) to shut it down gracefully.

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[Sumanta Sen]

Can you please refer to any sample code where this signal can be caught by verticle instance?

Thanks

[Tim Fox]

Why do you want to catch it?

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[Sumanta Sen]

We donot want stop all instance immediately.

We need to do certain parameter validation inside the application before killing the instance.

[Tim Fox]

Graceful shutdown does not "stop all instances immediately".

It calls the stop() methods of your verticles in child-first order, so if you if you need to do any validation before undeploying them you can do it in there.

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[Tim Fox]

You can, of course, provide your own shutdown hook just like you would in any Java program (that's not specific to Vert.x) but it shouldn't be necessary in most cases.