Examples with InstanceDescription org.apache.sling.discovery.InstanceDescription used on opensource projects

Example 41 with InstanceDescription

use of org.apache.sling.discovery.InstanceDescription in project sling by apache.

the class DefaultTopologyView method compareTopology.

/**
     * Compare this topology with the given one and determine how they compare
     * @param other the other topology against which to compare
     * @return the type describing how these two compare
     * @see Type
     */
public Type compareTopology(final DefaultTopologyView other) {
    if (other == null) {
        throw new IllegalArgumentException("other must not be null");
    }
    if ((localClusterSyncTokenId == null && other.localClusterSyncTokenId != null) || (other.localClusterSyncTokenId == null && localClusterSyncTokenId != null) || (localClusterSyncTokenId != null && !localClusterSyncTokenId.equals(other.localClusterSyncTokenId))) {
        logger.debug("compareTopology: different localClusterSyncTokenId");
        return Type.TOPOLOGY_CHANGED;
    }
    if (this.instances.size() != other.instances.size()) {
        logger.debug("compareTopology: different number of instances");
        return Type.TOPOLOGY_CHANGED;
    }
    boolean propertiesChanged = false;
    for (final InstanceDescription instance : this.instances) {
        final Iterator<InstanceDescription> it2 = other.instances.iterator();
        InstanceDescription matchingInstance = null;
        while (it2.hasNext()) {
            final InstanceDescription otherInstance = it2.next();
            if (instance.getSlingId().equals(otherInstance.getSlingId())) {
                matchingInstance = otherInstance;
                break;
            }
        }
        if (matchingInstance == null) {
            if (logger.isDebugEnabled()) {
                logger.debug("compareTopology: no matching instance found for {}", instance);
            }
            return Type.TOPOLOGY_CHANGED;
        }
        if (!instance.getClusterView().getId().equals(matchingInstance.getClusterView().getId())) {
            logger.debug("compareTopology: cluster view id does not match");
            return Type.TOPOLOGY_CHANGED;
        }
        if (!instance.isLeader() == matchingInstance.isLeader()) {
            logger.debug("compareTopology: leaders differ");
            return Type.TOPOLOGY_CHANGED;
        }
        if (!instance.getProperties().equals(matchingInstance.getProperties())) {
            propertiesChanged = true;
        }
    }
    if (propertiesChanged) {
        return Type.PROPERTIES_CHANGED;
    } else {
        return null;
    }
}

Example 42 with InstanceDescription

use of org.apache.sling.discovery.InstanceDescription in project sling by apache.

the class DefaultTopologyView method toString.

@Override
public String toString() {
    StringBuilder sb = new StringBuilder();
    try {
        boolean firstCluster = true;
        for (ClusterView clusterView : getClusterViews()) {
            if (!firstCluster) {
                sb.append(", ");
            }
            firstCluster = false;
            sb.append("[clusterId=" + clusterView.getId() + ", instances=");
            boolean firstInstance = true;
            for (InstanceDescription id : clusterView.getInstances()) {
                if (!firstInstance) {
                    sb.append(", ");
                }
                firstInstance = false;
                sb.append("[id=" + id.getSlingId() + ", isLeader=" + id.isLeader() + ", isLocal=" + id.isLocal() + "]");
            }
            sb.append("]");
        }
    } catch (Exception e) {
        // paranoia fallback
        sb = new StringBuilder(instances.toString());
    }
    return "DefaultTopologyView[current=" + isCurrent() + ", num=" + instances.size() + ", instances=" + sb + "]";
}

Example 43 with InstanceDescription

use of org.apache.sling.discovery.InstanceDescription 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 44 with InstanceDescription

use of org.apache.sling.discovery.InstanceDescription 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.");
}

Example 45 with InstanceDescription

use of org.apache.sling.discovery.InstanceDescription in project sling by apache.

the class DummyTopologyView method hashCode.

@Override
public int hashCode() {
    int c = 0;
    for (Iterator<InstanceDescription> it = instances.iterator(); it.hasNext(); ) {
        InstanceDescription instanceDescription = (InstanceDescription) it.next();
        c += instanceDescription.hashCode();
    }
    return c;
}