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java.lang.Objectorg.apache.oozie.command.XCommand<T>
org.apache.oozie.command.wf.WorkflowXCommand<String>
org.apache.oozie.command.wf.ExternalIdXCommand
public class ExternalIdXCommand
Field Summary |
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Fields inherited from class org.apache.oozie.command.XCommand |
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DEFAULT_LOCK_TIMEOUT, DEFAULT_REQUEUE_DELAY, dryrun, eventService, instrumentation, INSTRUMENTATION_GROUP, LOG, logInfo |
Constructor Summary | |
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ExternalIdXCommand(String externalId)
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Method Summary | |
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protected String |
execute()
Command execution body. |
String |
getEntityKey()
Return the entity key for the command. |
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. |
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.wf.WorkflowXCommand |
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generateEvent, generateEvent, generateEvent |
Methods inherited from class org.apache.oozie.command.XCommand |
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call, eagerLoadState, eagerVerifyPrecondition, executeInterrupts, getCreatedTime, getInstrumentation, getKey, getLockTimeOut, getLog, getName, getPriority, getRequeueDelay, getType, inInterruptMode, isReQueueRequired, queue, queue, resetUsed, setInterruptMode |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ExternalIdXCommand(String externalId)
Method Detail |
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protected boolean isLockRequired()
XCommand
Subclasses should override this method if they require locking.
isLockRequired
in class XCommand<String>
true/false
public String getEntityKey()
XCommand
getEntityKey
in interface XCallable<String>
getEntityKey
in class XCommand<String>
protected void loadState() throws CommandException
XCommand
Subclasses must implement this method and load the state needed to do the precondition check and execute the command.
loadState
in class XCommand<String>
CommandException
protected void verifyPrecondition() throws CommandException, PreconditionException
XCommand
verifyPrecondition
in class XCommand<String>
CommandException
- thrown if the precondition is not met.
PreconditionException
protected String execute() throws CommandException
XCommand
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.
execute
in class XCommand<String>
CommandException
- thrown if the command execution failed.
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