org.eclipse.smila.utils.config

Interface ConfigurationUpdateWatcher

All Known Implementing Classes:

ZkConfigurationUpdateWatcher

public interface ConfigurationUpdateWatcher

service interface for configuration update watchers.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	ConfigurationUpdateWatcher.UpdateableService

Method Summary

Methods

Modifier and Type	Method and Description
void	checkConfigVersions() compare cluster versions of configurations with local versions and update local deployment.
void	configDeleted(java.lang.String configName) Send delete notification, call on custom configuration remove.
void	configLoadedOnStart(java.lang.String configName, java.lang.String timestamp) Initialize notification structure for configuration, call on initial load on service start.
void	configUpdated(java.lang.String configName, java.lang.String timestamp) Send update notification, call on custom configuration creation or update.
void	registerService(ConfigurationUpdateWatcher.UpdateableService service) register a service to be notified on configuration updates.
void	startPolling() start polling for updates.
void	startPolling(int pollIntervalSeconds) start polling for updates with custom interval.
boolean	startWatching() install a ZK watch on the root node to get notifications about changes.
void	stopPolling() stop polling for updates.
void	stopWatching() stop watching: ZK watch on root node will not be reinstalled.

Method Detail

registerService

void registerService(ConfigurationUpdateWatcher.UpdateableService service)

register a service to be notified on configuration updates.

startWatching

boolean startWatching()

install a ZK watch on the root node to get notifications about changes.

Returns:

true if watched was installed successfully

stopWatching

void stopWatching()

stop watching: ZK watch on root node will not be reinstalled. Does not remove a currently installed watch, so it's possible that remaining watches will still receive notifications after this call.

startPolling

void startPolling()

start polling for updates.

startPolling

void startPolling(int pollIntervalSeconds)

start polling for updates with custom interval.

stopPolling

void stopPolling()

stop polling for updates.

configLoadedOnStart

void configLoadedOnStart(java.lang.String configName,
                       java.lang.String timestamp)

Initialize notification structure for configuration, call on initial load on service start. Does not trigger notifications for other nodes, just ensure that the node is created.

configUpdated

void configUpdated(java.lang.String configName,
                 java.lang.String timestamp)

Send update notification, call on custom configuration creation or update.

configDeleted

void configDeleted(java.lang.String configName)

Send delete notification, call on custom configuration remove.

checkConfigVersions

void checkConfigVersions()

compare cluster versions of configurations with local versions and update local deployment.