[jira] [Created] (IGNITE-19517) Add class resolution mechinism to compute

["Mikhail Pochatkin (Jira)" <ji...@apache.org>]

Mikhail Pochatkin created IGNITE-19517:
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             Summary: Add class resolution mechinism to compute
                 Key: IGNITE-19517
                 URL: https://issues.apache.org/jira/browse/IGNITE-19517
             Project: Ignite
          Issue Type: New Feature
            Reporter: Mikhail Pochatkin


h4. Regular behavior

As soon as code execution is initiated due to invocation one of the methods execute, executeColocated or broadcast the following steps must be performed:

 
 # Get a class loader which is identified by an array of DeploymentUnit instances passed to the called method.
 # If the class loader doesn’t exist yet, then create it:
 # For each deployment unit check that it is deployed:
 # If the deployment unit is deployed and can be used for code execution then use its location for class loading
 # If the deployment unit is deployed to the cluster but is not deployed to the node then initiate deployment on-demand.
 # If the deployment unit doesn’t exist, throw ClassNotFoundException with _“<class_fqdn>. Deployment unit <deployment_unit_id_and ver> doesn’t exist”_ message, where _<deployment_unit_id_and_ver>_ is a concatenation of ID and version (e.g. com.example:1.0.0)


 # Check that deployment unit can be used for code execution:
 # If the deployment unit exists but can’t be used for code execution, throw ClassNotFoundException with _“<class_fqdn>. Deployment unit <deployment_unit_id> can’t be used: [clusterStatus = <clusterDURecord.status>, nodeStatus = <nodeDURecord.status>]”_ message.


 # Load a class of task/job passed to the Compute API method as parameter. At this point ClassNotFoundException could be thrown from the class loader.
 # Execute required code.

In order to have the possibility to detect that some code is in progress and uses some class loader a reference counter could be used. The counter must be incremented when job execution is started and decremented when code execution is finished.



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