org.neo4j.kernel.ha

Interface UpdatePuller

All Known Implementing Classes:

SlaveUpdatePuller

public interface UpdatePuller

Puller of transactions updates from a different store. Pulls for updates and applies them into a current store.

On a running instance of a store there should be only one active implementation of this interface.

Typically master instance should use NONE implementation since master is owner of data in cluster env and its up to slaves to pull updates.

See Also:

SlaveUpdatePuller

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	UpdatePuller.Condition Condition to be meet during update pulling.

Field Summary

Fields

Modifier and Type	Field and Description
static UpdatePuller	NONE

Method Summary

Modifier and Type	Method and Description
void	pullUpdates() Pull all available updates.
void	pullUpdates(UpdatePuller.Condition condition, boolean assertPullerActive) Pull updates and waits for the supplied condition to be fulfilled as part of the update pulling happening.
boolean	tryPullUpdates() Try to pull all updates

Field Detail

NONE

static final UpdatePuller NONE

Method Detail

pullUpdates

void pullUpdates()
          throws InterruptedException

Pull all available updates.

Throws:

InterruptedException - in case if interrupted while waiting for updates

tryPullUpdates

boolean tryPullUpdates()
                throws InterruptedException

Try to pull all updates

Returns:

true if all updates pulled, false if updater fail on update retrieval

Throws:

InterruptedException - in case if interrupted while waiting for updates

pullUpdates

void pullUpdates(UpdatePuller.Condition condition,
                 boolean assertPullerActive)
          throws InterruptedException

Pull updates and waits for the supplied condition to be fulfilled as part of the update pulling happening.

Parameters:

condition - UpdatePuller.Condition to wait for.

assertPullerActive - if true then observing an inactive update puller will throw an IllegalStateException,

Throws:

InterruptedException - if we were interrupted while awaiting the condition.

IllegalStateException - if strictlyAssertActive and the update puller became inactive while awaiting the condition.