Examples with ClusterSyncServiceChain org.apache.sling.discovery.commons.providers.spi.base.ClusterSyncServiceChain used on opensource projects

Example 1 with ClusterSyncServiceChain

use of org.apache.sling.discovery.commons.providers.spi.base.ClusterSyncServiceChain in project sling by apache.

the class OakDiscoveryService method activate.

/**
     * Activate this service
     */
@Activate
protected void activate(final BundleContext bundleContext) {
    logger.debug("OakDiscoveryService activating...");
    if (settingsService == null) {
        throw new IllegalStateException("settingsService not found");
    }
    if (oakViewChecker == null) {
        throw new IllegalStateException("heartbeatHandler not found");
    }
    slingId = settingsService.getSlingId();
    ClusterSyncService consistencyService;
    if (config.getSyncTokenEnabled()) {
        //TODO: ConsistencyHistory is implemented a little bit hacky ..
        ClusterSyncHistory consistencyHistory = new ClusterSyncHistory();
        oakBacklogClusterSyncService.setConsistencyHistory(consistencyHistory);
        syncTokenService.setConsistencyHistory(consistencyHistory);
        consistencyService = new ClusterSyncServiceChain(oakBacklogClusterSyncService, syncTokenService);
    } else {
        consistencyService = oakBacklogClusterSyncService;
    }
    viewStateManager = ViewStateManagerFactory.newViewStateManager(viewStateManagerLock, consistencyService);
    if (config.getMinEventDelay() > 0) {
        viewStateManager.installMinEventDelayHandler(this, scheduler, config.getMinEventDelay());
    }
    final String isolatedClusterId = UUID.randomUUID().toString();
    {
        // create a pre-voting/isolated topologyView which would be used
        // until the first voting has finished.
        // this way for the single-instance case the clusterId can
        // remain the same between a getTopology() that is invoked before
        // the first TOPOLOGY_INIT and afterwards
        DefaultClusterView isolatedCluster = new DefaultClusterView(isolatedClusterId);
        Map<String, String> emptyProperties = new HashMap<String, String>();
        DefaultInstanceDescription isolatedInstance = new DefaultInstanceDescription(isolatedCluster, true, true, slingId, emptyProperties);
        Collection<InstanceDescription> col = new ArrayList<InstanceDescription>();
        col.add(isolatedInstance);
        final DefaultTopologyView topology = new DefaultTopologyView();
        topology.addInstances(col);
        topology.setNotCurrent();
        setOldView(topology);
    }
    setOldView((DefaultTopologyView) getTopology());
    getOldView().setNotCurrent();
    // make sure the first heartbeat is issued as soon as possible - which
    // is right after this service starts. since the two (discoveryservice
    // and heartbeatHandler need to know each other, the discoveryservice
    // is passed on to the heartbeatHandler in this initialize call).
    oakViewChecker.initialize(this);
    viewStateManagerLock.lock();
    try {
        viewStateManager.handleActivated();
        doUpdateProperties();
        DefaultTopologyView newView = (DefaultTopologyView) getTopology();
        if (newView.isCurrent()) {
            viewStateManager.handleNewView(newView);
        } else {
            // SLING-3750: just issue a log.info about the delaying
            logger.info("activate: this instance is in isolated mode and must yet finish voting before it can send out TOPOLOGY_INIT.");
        }
        activated = true;
        setOldView(newView);
        // bind them to the viewstatemanager too
        for (TopologyEventListener listener : pendingListeners) {
            viewStateManager.bind(listener);
        }
        pendingListeners.clear();
        viewStateManager.bind(changePropagationListener);
    } finally {
        if (viewStateManagerLock != null) {
            viewStateManagerLock.unlock();
        }
    }
    URL[] topologyConnectorURLs = config.getTopologyConnectorURLs();
    if (topologyConnectorURLs != null) {
        for (int i = 0; i < topologyConnectorURLs.length; i++) {
            final URL aURL = topologyConnectorURLs[i];
            if (aURL != null) {
                try {
                    logger.info("activate: registering outgoing topology connector to " + aURL);
                    connectorRegistry.registerOutgoingConnector(clusterViewService, aURL);
                } catch (final Exception e) {
                    logger.info("activate: could not register url: " + aURL + " due to: " + e, e);
                }
            }
        }
    }
    logger.debug("OakDiscoveryService activated.");
}