Package com.zfabrik.util.sync

Interface ISynchronizer

All Known Implementing Classes:

AbstractComponentRepository, AbstractExtComponentRepository

public interface ISynchronizer

A Synchronizer participates in system synchoronization. During a synchronization, a synchronizer may declare any number of resources invalid and subsequently perform synchronization post processing.

The synchronization implementation looks up all synchronizers and implements the following steps:

1. Pre-invalidation: Ask all synchronizers for invalid resources via the preInvalidation(ISynchronization) method
2. Invalidate all declared resources.
3. Completion:: Complete synchronization via the complete(ISynchronization) method.

Synchronizers have a priority. Synchronizers with higher priority will be called later during the pre-invalidation phase and they will be called earlier during the completion phase.

The following table lists priorities of common synchronizers:

Synchronizer	priority	preInvalidation	order	Completion	order
com.zfabrik.boot.repos/synchronizer	900	run pre-invalidation on all extensions of AbstractComponentRepo	run complete on all extensions of AbstractComponentRepo
com.zfabrik.components.workeradapter/workerSynchronizer	800		Reset worker side db
com.zfabrik.components/querySynchronizer	550		Verify component query subscriptions at home and workers
com.zfabrik.workers/workerSynchronizer	500		Propagate invalidations to worker. Attain worker target states
com.zfabrik.hubcr/synchronizer	100		Trigger update scan on worker-side Hub CR implementation
com.zfabrik.boot.main/homeSynchronizer	1		Attain home states (home_up)

Author:

hb

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	PRIO	Component property defining the priority of a synchronizer
static java.lang.String	TYPE	Component type of a synchronizer

Method Summary

Modifier and Type	Method	Description
void	complete(ISynchronization sync)	synchronizers implement this method to re-establish any desired system state after all invalidations have been performed.
void	preInvalidation(ISynchronization sync)	synchronizers implement this method to collect the set of components to invalidate and log messages to the end user.

Field Detail

TYPE

static final java.lang.String TYPE

Component type of a synchronizer

See Also:

Constant Field Values

PRIO

static final java.lang.String PRIO

Component property defining the priority of a synchronizer

See Also:

Constant Field Values

Method Detail

preInvalidation

void preInvalidation(ISynchronization sync)

synchronizers implement this method to collect the set of components to invalidate and log messages to the end user.

complete

void complete(ISynchronization sync)

synchronizers implement this method to re-establish any desired system state after all invalidations have been performed. Note that the set of synchronizer in this call may be different to before, due to new system content.