org.apache.oozie.command

Class RerunTransitionXCommand<T>

java.lang.Object

org.apache.oozie.command.XCommand<T>

org.apache.oozie.command.TransitionXCommand<T>

org.apache.oozie.command.RerunTransitionXCommand<T>

Type Parameters:

T -

All Implemented Interfaces:

Callable<T>, XCallable<T>

Direct Known Subclasses:

BundleRerunXCommand, CoordRerunXCommand

public abstract class RerunTransitionXCommand<T>
extends TransitionXCommand<T>

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

updateJob() : update job status and attributes rerunChildren() : submit or queue commands to rerun children notifyParent() : update the status to upstream if any

Field Summary

Fields

Modifier and Type	Field and Description
protected String	jobId
protected Job.Status	prevStatus
protected T	ret

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, eventService, instrumentation, INSTRUMENTATION_GROUP, LOG

Constructor Summary

Constructors

Constructor and Description
RerunTransitionXCommand(String name, String type, int priority) The constructor for abstract class RerunTransitionXCommand
RerunTransitionXCommand(String name, String type, int priority, boolean dryrun) The constructor for abstract class RerunTransitionXCommand

Method Summary

Modifier and Type	Method and Description
protected void	eagerLoadState() Load the necessary state to perform an eager precondition check.
protected void	eagerVerifyPrecondition() Verify the precondition for the command before obtaining a lock.
protected T	execute() Command execution body.
Job.Status	getPrevStatus() This method will return the previous status.
abstract void	rerunChildren() Rerun actions associated with the job
void	transitToNext() Transit to the next status based on the result of the Job.
protected void	verifyPrecondition() Verify the precondition for the command after a lock has been obtain, just before executing the command.

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

generateEvents, getJob, notifyParent, performWrites, setJob, updateJob

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

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

Methods inherited from class java.lang.Object

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

Field Detail

jobId

protected String jobId

ret

protected T ret

prevStatus

protected Job.Status prevStatus

Constructor Detail

RerunTransitionXCommand

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

The constructor for abstract class RerunTransitionXCommand

Parameters:

name - the command name

type - the command type

priority - the command priority

RerunTransitionXCommand

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

The constructor for abstract class RerunTransitionXCommand

Parameters:

name - the command name

type - the command type

priority - the command priority

dryrun - true if dryrun is enable

Method Detail

transitToNext

public 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<T>

rerunChildren

public abstract void rerunChildren()
                            throws CommandException

Rerun actions associated with the job

Throws:

CommandException - thrown if failed to rerun actions

execute

protected T 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<T>

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.

verifyPrecondition

protected void verifyPrecondition()
                           throws CommandException,
                                  PreconditionException

Description copied from class: XCommand

Verify the precondition for the command after a lock has been obtain, just before executing the command.

Specified by:

verifyPrecondition in class XCommand<T>

Throws:

CommandException - thrown if the precondition is not met.

PreconditionException

eagerLoadState

protected void eagerLoadState()
                       throws CommandException

Description copied from class: XCommand

Load the necessary state to perform an eager precondition check.

This implementation does a NOP.

Subclasses should override this method and load the state needed to do an eager precondition check.

A trivial implementation is calling {link #loadState}.

Overrides:

eagerLoadState in class XCommand<T>

Throws:

CommandException

eagerVerifyPrecondition

protected void eagerVerifyPrecondition()
                                throws CommandException,
                                       PreconditionException

Description copied from class: XCommand

Verify the precondition for the command before obtaining a lock.

This implementation does a NOP.

A trivial implementation is calling {link #verifyPrecondition}.

Overrides:

eagerVerifyPrecondition in class XCommand<T>

Throws:

CommandException - thrown if the precondition is not met.

PreconditionException

getPrevStatus

public Job.Status getPrevStatus()

This method will return the previous status.

Returns:

JOB Status