Examples with DefaultInstanceDescription org.apache.sling.discovery.commons.providers.DefaultInstanceDescription used on opensource projects

Example 11 with DefaultInstanceDescription

use of org.apache.sling.discovery.commons.providers.DefaultInstanceDescription in project sling by apache.

the class OakClusterViewService method asClusterView.

private LocalClusterView asClusterView(DiscoveryLiteDescriptor descriptor, ResourceResolver resourceResolver) throws Exception {
    if (descriptor == null) {
        throw new IllegalArgumentException("descriptor must not be null");
    }
    if (resourceResolver == null) {
        throw new IllegalArgumentException("resourceResolver must not be null");
    }
    logger.trace("asClusterView: start");
    String clusterViewId = descriptor.getViewId();
    if (clusterViewId == null || clusterViewId.length() == 0) {
        logger.trace("asClusterView: no clusterId provided by discovery-lite descriptor - reading from repo.");
        clusterViewId = readOrDefineClusterId(resourceResolver);
    }
    String localClusterSyncTokenId = /*descriptor.getViewId()+"_"+*/
    String.valueOf(descriptor.getSeqNum());
    if (!descriptor.isFinal()) {
        throw new UndefinedClusterViewException(Reason.NO_ESTABLISHED_VIEW, "descriptor is not yet final: " + descriptor);
    }
    LocalClusterView cluster = new LocalClusterView(clusterViewId, localClusterSyncTokenId);
    long me = descriptor.getMyId();
    int[] activeIds = descriptor.getActiveIds();
    if (activeIds == null || activeIds.length == 0) {
        throw new UndefinedClusterViewException(Reason.NO_ESTABLISHED_VIEW, "Descriptor contained no active ids: " + descriptor.getDescriptorStr());
    }
    // convert int[] to List<Integer>
    //TODO: could use Guava's Ints class here..
    List<Integer> activeIdsList = new LinkedList<Integer>();
    for (Integer integer : activeIds) {
        activeIdsList.add(integer);
    }
    // step 1: sort activeIds by their leaderElectionId
    //   serves two purposes: pos[0] is then leader
    //   and the rest are properly sorted within the cluster
    final Map<Integer, String> leaderElectionIds = new HashMap<Integer, String>();
    for (Integer id : activeIdsList) {
        String slingId = idMapService.toSlingId(id, resourceResolver);
        if (slingId == null) {
            idMapService.clearCache();
            throw new UndefinedClusterViewException(Reason.NO_ESTABLISHED_VIEW, "no slingId mapped for clusterNodeId=" + id);
        }
        String leaderElectionId = getLeaderElectionId(resourceResolver, slingId);
        leaderElectionIds.put(id, leaderElectionId);
    }
    Collections.sort(activeIdsList, new Comparator<Integer>() {

        @Override
        public int compare(Integer arg0, Integer arg1) {
            return leaderElectionIds.get(arg0).compareTo(leaderElectionIds.get(arg1));
        }
    });
    for (int i = 0; i < activeIdsList.size(); i++) {
        int id = activeIdsList.get(i);
        // thx to sorting above [0] is leader indeed
        boolean isLeader = i == 0;
        boolean isOwn = id == me;
        String slingId = idMapService.toSlingId(id, resourceResolver);
        if (slingId == null) {
            idMapService.clearCache();
            logger.info("asClusterView: cannot resolve oak-clusterNodeId {} to a slingId", id);
            throw new Exception("Cannot resolve oak-clusterNodeId " + id + " to a slingId");
        }
        Map<String, String> properties = readProperties(slingId, resourceResolver);
        // create a new instance (adds itself to the cluster in the constructor)
        new DefaultInstanceDescription(cluster, isLeader, isOwn, slingId, properties);
    }
    logger.trace("asClusterView: returning {}", cluster);
    InstanceDescription local = cluster.getLocalInstance();
    if (local != null) {
        return cluster;
    } else {
        logger.info("getClusterView: the local instance (" + getSlingId() + ") is currently not included in the existing established view! " + "This is normal at startup. At other times is pseudo-network-partitioning is an indicator for repository/network-delays or clocks-out-of-sync (SLING-3432). " + "(increasing the heartbeatTimeout can help as a workaround too) " + "The local instance will stay in TOPOLOGY_CHANGING or pre _INIT mode until a new vote was successful.");
        throw new UndefinedClusterViewException(Reason.ISOLATED_FROM_TOPOLOGY, "established view does not include local instance - isolated");
    }
}

Example 12 with DefaultInstanceDescription

use of org.apache.sling.discovery.commons.providers.DefaultInstanceDescription 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.");
}

Example 13 with DefaultInstanceDescription

use of org.apache.sling.discovery.commons.providers.DefaultInstanceDescription in project sling by apache.

the class AnnouncementRegistryImplTest method doTestRegisterUnregister.

private void doTestRegisterUnregister(boolean includeFinalExpiryCheck) throws Exception {
    try {
        registry.registerAnnouncement(null);
        fail("should complain");
    } catch (IllegalArgumentException iae) {
    // ok
    }
    try {
        registry.unregisterAnnouncement(null);
        fail("should complain");
    } catch (IllegalArgumentException iae) {
    // ok
    }
    try {
        registry.unregisterAnnouncement("");
        fail("should complain");
    } catch (IllegalArgumentException iae) {
    // ok
    }
    try {
        new Announcement(null);
        fail("should complain");
    } catch (IllegalArgumentException iae) {
    // ok
    }
    try {
        new Announcement("");
        fail("should complain");
    } catch (IllegalArgumentException iae) {
    // ok
    }
    Announcement ann = new Announcement(slingId);
    assertFalse(ann.isValid());
    assertFalse(registry.registerAnnouncement(ann) != -1);
    DefaultClusterView localCluster = new DefaultClusterView(UUID.randomUUID().toString());
    ann.setLocalCluster(localCluster);
    assertFalse(ann.isValid());
    assertFalse(registry.registerAnnouncement(ann) != -1);
    try {
        registry.listInstances(localCluster);
        fail("doing getInstances() on an empty cluster should throw an illegalstateexception");
    } catch (IllegalStateException ise) {
    // ok
    }
    DefaultInstanceDescription instance = TopologyHelper.createInstanceDescription(ann.getOwnerId(), true, localCluster);
    assertEquals(instance.getSlingId(), ann.getOwnerId());
    assertTrue(ann.isValid());
    assertTrue(registry.registerAnnouncement(ann) != -1);
    assertEquals(1, registry.listInstances(localCluster).size());
    registry.checkExpiredAnnouncements();
    assertEquals(1, registry.listInstances(localCluster).size());
    registry.unregisterAnnouncement(ann.getOwnerId());
    assertEquals(0, registry.listInstances(localCluster).size());
    assertTrue(ann.isValid());
    assertTrue(registry.registerAnnouncement(ann) != -1);
    assertEquals(1, registry.listInstances(localCluster).size());
    if (includeFinalExpiryCheck) {
        Thread.sleep(10500);
        assertEquals(0, registry.listInstances(localCluster).size());
    }
}

Example 14 with DefaultInstanceDescription

use of org.apache.sling.discovery.commons.providers.DefaultInstanceDescription in project sling by apache.

the class DefaultTopologyViewTest method testCompare.

@Test
public void testCompare() throws Exception {
    DefaultTopologyView newView = TopologyHelper.createTopologyView(UUID.randomUUID().toString(), UUID.randomUUID().toString());
    try {
        newView.compareTopology(null);
        fail("Should complain about null");
    } catch (Exception e) {
    // ok
    }
    DefaultTopologyView oldView = TopologyHelper.cloneTopologyView(newView);
    assertNull(newView.compareTopology(oldView));
    DefaultInstanceDescription id = TopologyHelper.createInstanceDescription(newView.getClusterViews().iterator().next());
    TopologyHelper.addInstanceDescription(newView, id);
    assertEquals(Type.TOPOLOGY_CHANGED, newView.compareTopology(oldView));
    assertEquals(2, newView.getInstances().size());
    // addInstanceDescription now no longer throws an exception if you add
    // the same
    // instance twice. this provides greater stability
    TopologyHelper.addInstanceDescription(newView, id);
    assertEquals(2, newView.getInstances().size());
    // try{
    // TopologyTestHelper.addInstanceDescription(newView, id);
    // fail("should not be able to add twice");
    // } catch(Exception e) {
    // // ok
    // }
    oldView = TopologyHelper.cloneTopologyView(newView);
    assertNull(newView.compareTopology(oldView));
    DefaultInstanceDescription instance = (DefaultInstanceDescription) newView.getInstances().iterator().next();
    instance.setProperty("a", "b");
    assertEquals(Type.PROPERTIES_CHANGED, newView.compareTopology(oldView));
    oldView = TopologyHelper.cloneTopologyView(newView);
    assertNull(newView.compareTopology(oldView));
    instance.setProperty("a", "B");
    assertEquals(Type.PROPERTIES_CHANGED, newView.compareTopology(oldView));
    oldView = TopologyHelper.cloneTopologyView(newView);
    assertNull(newView.compareTopology(oldView));
    instance.setProperty("a", "B");
    assertNull(newView.compareTopology(oldView));
    // now change the properties of the first instance but modify the second instance' cluster
    Iterator<InstanceDescription> it = newView.getInstances().iterator();
    DefaultInstanceDescription firstInstance = (DefaultInstanceDescription) it.next();
    assertNotNull(firstInstance);
    DefaultInstanceDescription secondInstance = (DefaultInstanceDescription) it.next();
    assertNotNull(secondInstance);
    firstInstance.setProperty("c", "d");
    DefaultClusterView cluster = new DefaultClusterView(UUID.randomUUID().toString());
    PrivateAccessor.setField(secondInstance, "clusterView", null);
    cluster.addInstanceDescription(secondInstance);
    assertEquals(Type.TOPOLOGY_CHANGED, newView.compareTopology(oldView));
}

Example 15 with DefaultInstanceDescription

use of org.apache.sling.discovery.commons.providers.DefaultInstanceDescription in project sling by apache.

the class DiscoveryServiceImpl method activate.

/**
     * Activate this service
     */
@Activate
protected void activate(final BundleContext bundleContext) {
    logger.debug("DiscoveryServiceImpl activating...");
    if (settingsService == null) {
        throw new IllegalStateException("settingsService not found");
    }
    if (heartbeatHandler == null) {
        throw new IllegalStateException("heartbeatHandler not found");
    }
    slingId = settingsService.getSlingId();
    final ClusterSyncService clusterSyncService;
    if (!config.useSyncTokenService()) {
        logger.info("activate: useSyncTokenService is configured to false. Using pass-through cluster-sync-service.");
        clusterSyncService = PASS_THROUGH_CLUSTER_SYNC_SERVICE;
    } else if (syncTokenService == null) {
        logger.warn("activate: useSyncTokenService is configured to true but there's no SyncTokenService! Using pass-through cluster-sync-service instead.");
        clusterSyncService = syncTokenService;
    } else {
        logger.info("activate: useSyncTokenService is configured to true, using the available SyncTokenService: " + syncTokenService);
        clusterSyncService = syncTokenService;
    }
    viewStateManager = ViewStateManagerFactory.newViewStateManager(viewStateManagerLock, clusterSyncService);
    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).
    heartbeatHandler.initialize(this, isolatedClusterId);
    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);
                }
            }
        }
    }
    registerMBean(bundleContext);
    logger.debug("DiscoveryServiceImpl activated.");
}