Bill,
The one case not mentioned below is a remote command executing
a local command. After talking with Vijay we are thinking this
is probably not supported since the local command won't be in
the DAS's habitat.
Does that sound right?
This then brings us back to refactoring the command to
share code between the CLI and the DAS.
Joe
Bill Shannon wrote:
> As Tim described, one option is always to refactor the commands so that
> the common code is in a non-command shared class.
>
> But, really, there should be a straightforward way to invoke one command
> from another, both local commands and remote commands. Some of the
> challenges are... how do you want to supply the parameters, and what
> do you want to do with the results?
>
> For a remote command executing a remote command, I believe you should
> be able to use the CommandRunner API.
>
> For a local command executing either a local or remote command, you
> should be able to do this:
>
> @Inject
> Habitat habitat;
> ...
> CLICommand cmd = CLICommand.getCommand(habitat, "command-name");
> String[] argv = ...; // just like asadmin command line
> int rc = cmd.execute(argv); // argv[0] is command-name
> // note that output goes to System.out
>
> If a local command needs to execute a command that is know to be a
> remote command, you can construct a RemoteCommand object directly.
> There are a variety of constructors and execute methods that offer
> more control over the arguments and output.
>
> If a remote command wants to call a local command on another node,
> well, I believe that's the "remote command execution facility" that
> *you* are building! :-)
>
>
> Joe Di Pol wrote on 06/03/2010 01:00 PM:
>>
>> I'm looking for a little push in the right direction.
>> If there are existing commands that do this feel free
>> to point me at them.
>>
>> Case 1
>> ------
>> I have a remote command that as part of it's processing
>> wants to invoke another remote command. For example
>> start-cluster will likely loop through the instances
>> and call start-instance on each instance.
>>
>> What is the suggested way to have a remote command
>> execute another remote command locally? Seems like I
>> want a variation of enterprise.admin.cli.remote.RemoteCommand
>> that operates directly on the command class (instead
>> of remotely over HTTP).
>>
>> Case 2
>> -------
>> Same as Case 1 except I want to call a local command.
>> For example start-instance may want to call
>> start-local-instance if the instance is local to the DAS.
>>
>> Thanks,
>>
>> Joe
>>
>>
>>
>>
>>
>>
>>
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>
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