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org.apache.oozie.command
Class StartTransitionXCommand

java.lang.Object
  org.apache.oozie.command.XCommand<T>
      org.apache.oozie.command.TransitionXCommand<Void>
          org.apache.oozie.command.StartTransitionXCommand

All Implemented Interfaces:

Callable<Void>, XCallable<Void>

Direct Known Subclasses:

BundleStartXCommand

public abstract class StartTransitionXCommand
extends TransitionXCommand<Void>

Transition command for start the job. The derived class has to override these following functions:

loadState() : load the job's and/or actions' state updateJob() : update job status and attributes StartChildren() : submit or queue commands to start children notifyParent() : update the status to upstream if any

Field Summary

Fields inherited from class org.apache.oozie.command.TransitionXCommand

insertList, job, updateList

Fields inherited from class org.apache.oozie.command.XCommand

DEFAULT_LOCK_TIMEOUT, DEFAULT_REQUEUE_DELAY, dryrun, instrumentation, INSTRUMENTATION_GROUP, LOG, logInfo

Constructor Summary

StartTransitionXCommand(String name, String type, int priority)
The constructor for abstract class StartTransitionXCommand

StartTransitionXCommand(String name, String type, int priority, boolean dryrun)
The constructor for abstract class StartTransitionXCommand

Method Summary

protected Void	execute() Command execution body.
abstract void	StartChildren() Start actions associated with the job
void	transitToNext() Transit to the next status based on the result of the Job.

Methods inherited from class org.apache.oozie.command.TransitionXCommand

getJob, notifyParent, performWrites, setJob, updateJob

Methods inherited from class org.apache.oozie.command.XCommand

call, eagerLoadState, eagerVerifyPrecondition, executeInterrupts, getCreatedTime, getEntityKey, getInstrumentation, getKey, getLockTimeOut, getLog, getName, getPriority, getRequeueDelay, getType, inInterruptMode, isLockRequired, isReQueueRequired, loadState, queue, queue, resetUsed, setInterruptMode, verifyPrecondition

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StartTransitionXCommand

public StartTransitionXCommand(String name,
                               String type,
                               int priority)

The constructor for abstract class StartTransitionXCommand

Parameters:

name - the command name

type - the command type

priority - the command priority

StartTransitionXCommand

public StartTransitionXCommand(String name,
                               String type,
                               int priority,
                               boolean dryrun)

The constructor for abstract class StartTransitionXCommand

Parameters:

name - the command name

type - the command type

priority - the command priority

dryrun - true if dryrun is enable

Method Detail

StartChildren

public abstract void StartChildren()
                            throws CommandException

Start actions associated with the job

Throws:

CommandException - thrown if failed to start actions

transitToNext

public final void transitToNext()

Description copied from class: TransitionXCommand

Transit to the next status based on the result of the Job.

Specified by:

transitToNext in class TransitionXCommand<Void>

execute

protected Void execute()
                throws CommandException

Description copied from class: XCommand

Command execution body.

This method will be invoked after the {link #loadState} and {link #verifyPrecondition} methods.

If the command requires locking, this method will be invoked ONLY if the lock has been acquired.

Overrides:

execute in class TransitionXCommand<Void>

Returns:

a return value from the execution of the command, only meaningful if the command is executed synchronously.

Throws:

CommandException - thrown if the command execution failed.