Examples of org.apache.slider.server.services.workflow.ForkedProcessService

Package org.apache.slider.server.services.workflow

Examples of org.apache.slider.server.services.workflow.ForkedProcessService

org.apache.slider.server.services.workflow.ForkedProcessService
Service wrapper for an external program that is launched and can/will terminate. This service is notified when the subprocess terminates, and stops itself and converts a non-zero exit code into a failure exception.
Key Features:
1. The property {@link #executionTimeout} can be set to set a limiton the duration of a process
2. Output is streamed to the output logger provided
3. The most recent lines of output are saved to a linked list
4. A synchronous callback, {@link LongLivedProcessLifecycleEvent}, is raised on the start and finish of a process.
Usage:
The service can be built in the constructor, {@link #ForkedProcessService(String,Map,List)}, or have its simple constructor used to instantiate the service, then the {@link #build(Map,List)} command used to define the environment variablesand list of commands to execute. One of these two options MUST be exercised before calling the services's {@link #start()} method.
The forked process is executed in the service's {@link #serviceStart()} method;if still running when the service is stopped, {@link #serviceStop()} willattempt to stop it.
The service delegates process execution to {@link LongLivedProcess}, receiving callbacks via the {@link LongLivedProcessLifecycleEvent}. When the service receives a callback notifying that the process has completed, it calls its {@link #stop()} method. If the error code was non-zero, the service is logged as having failed.

                            appConfOperations.getGlobalOptions().getMandatoryOption(
                              OPTION_ACCUMULO_PASSWORD),
                            "--clear-instance-name");




    ForkedProcessService accumulo =
      queueCommand(getName(), env, commands);
    //add a timeout to this process
    accumulo.setTimeout(
      appConfOperations.getGlobalOptions().getOptionInt(
        OPTION_ACCUMULO_INIT_TIMEOUT,
        INIT_TIMEOUT_DEFAULT), 1);
    
    //callback to AM to trigger cluster review is set up to happen after

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      //failed for some reason
      if (cause instanceof ExitCodeProvider) {
        return ((ExitCodeProvider) cause).getExitCode();
      }
    }
    ForkedProcessService lastProc = latestProcess();
    if (lastProc == null || !lastProc.isProcessTerminated()) {
      return 0;
    } else {
      return lastProc.getExitCode();
    }
  }

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  protected ForkedProcessService queueCommand(String name,
                              Map<String, String> env,
                              List<String> commands) throws
                                                     IOException,
      SliderException {
    ForkedProcessService process = buildProcess(name, env, commands);
    //register the service for lifecycle management; when this service
    //is terminated, so is the master process
    addService(process);
    return process;
  }

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  public ForkedProcessService buildProcess(String name,
                                           Map<String, String> env,
                                           List<String> commands) throws
                                                                  IOException,
      SliderException {
    ForkedProcessService process;
    process = new ForkedProcessService(name);
    process.init(getConfig());
    process.build(env, commands);
    return process;
  }

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org.apache.slider.providers.AbstractProviderService

org.apache.slider.providers.accumulo.AccumuloProviderService

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org.apache.slider.core.main.ServiceLaunchException

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