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org.apache.oozie.command.coord
Class SLAEventsXCommand

java.lang.Object
  org.apache.oozie.command.XCommand<List<SLAEventBean>>
      org.apache.oozie.command.coord.SLAEventsXCommand

All Implemented Interfaces:

Callable<List<SLAEventBean>>, XCallable<List<SLAEventBean>>

public class SLAEventsXCommand
extends XCommand<List<SLAEventBean>>

The command to get a list of SLAEvents which are greater than given seqId.

Field Summary

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

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

Constructor Summary

SLAEventsXCommand(long seqId, int maxNoEvnts)

Method Summary

protected List<SLAEventBean>	execute() Command execution body.
protected String	getEntityKey() Return the entity key for the command.
long	getLastSeqId() Get lastSeqId
protected boolean	isLockRequired() Indicate if the the command requires locking.
protected void	loadState() Load the necessary state to perform the precondition check and to execute the command.
void	setLastSeqId(long lastSeqId) Set lastSeqId
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.XCommand

call, eagerLoadState, eagerVerifyPrecondition, getCreatedTime, getInstrumentation, getKey, getLockTimeOut, getLog, getName, getPriority, getRequeueDelay, getType, isReQueueRequired, queue, queue, resetUsed

Methods inherited from class java.lang.Object

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

Constructor Detail

SLAEventsXCommand

public SLAEventsXCommand(long seqId,
                         int maxNoEvnts)

Method Detail

isLockRequired

protected boolean isLockRequired()

Description copied from class: XCommand

Indicate if the the command requires locking.

Subclasses should override this method if they require locking.

Specified by:

isLockRequired in class XCommand<List<SLAEventBean>>

Returns:

true/false

getEntityKey

protected String getEntityKey()

Description copied from class: XCommand

Return the entity key for the command.

Specified by:

getEntityKey in class XCommand<List<SLAEventBean>>

Returns:

the entity key for the command.

loadState

protected void loadState()
                  throws CommandException

Description copied from class: XCommand

Load the necessary state to perform the precondition check and to execute the command.

Subclasses must implement this method and load the state needed to do the precondition check and execute the command.

Specified by:

loadState in class XCommand<List<SLAEventBean>>

Throws:

CommandException

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<List<SLAEventBean>>

Throws:

CommandException - thrown if the precondition is not met.

PreconditionException

execute

protected List<SLAEventBean> 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.

Specified by:

execute in class XCommand<List<SLAEventBean>>

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.

setLastSeqId

public void setLastSeqId(long lastSeqId)

Set lastSeqId

Parameters:

lastSeqId -

getLastSeqId

public long getLastSeqId()

Get lastSeqId

Returns:

lastSeqId