Examples with ReverseLookupComputingCacheEntryListener org.jivesoftware.util.cache.ReverseLookupComputingCacheEntryListener used on opensource projects

Example 1 with ReverseLookupComputingCacheEntryListener

use of org.jivesoftware.util.cache.ReverseLookupComputingCacheEntryListener in project Openfire by igniterealtime.

the class RoutingTableImpl method joinedCluster.

@Override
public void joinedCluster() {
    // The local node joined a cluster.
    // 
    // Upon joining a cluster, clustered caches are reset to their clustered equivalent (by the swap from the local
    // cache implementation to the clustered cache implementation that's done in the implementation of
    // org.jivesoftware.util.cache.CacheFactory.joinedCluster). This means that they now hold data that's
    // available on all other cluster nodes. Data that's available on the local node needs to be added again.
    restoreCacheContent();
    Log.debug("Add the entry listeners to the corresponding caches.");
    // Register a cache entry event listeners that will collect data for entries added by all other cluster nodes,
    // which is intended to be used (only) in the event of a cluster split.
    final ClusteredCacheEntryListener<String, ClientRoute> userCacheEntryListener = new ReverseLookupUpdatingCacheEntryListener<>(routeOwnersByClusterNode);
    final ClusteredCacheEntryListener<DomainPair, NodeID> serversCacheEntryListener = new ReverseLookupUpdatingCacheEntryListener<>(s2sDomainPairsByClusterNode);
    final ClusteredCacheEntryListener<String, HashSet<NodeID>> componentsCacheEntryListener = new ReverseLookupComputingCacheEntryListener<>(componentsByClusterNode, nodeIDS -> nodeIDS.stream().filter(n -> !n.equals(XMPPServer.getInstance().getNodeID())).collect(Collectors.toSet()));
    // Note that, when #joinedCluster() fired, the cache will _always_ have been replaced, meaning that it won't
    // have old event listeners. When #leaveCluster() fires, the cache will be destroyed. This takes away the need
    // to explicitly deregister the listener in that case.
    // Ensure that event listeners have been registered with the caches, before starting to simulate 'entryAdded' events,
    // to prevent the possibility of having entries that are missed by the simulation because of bad timing.
    usersCache.addClusteredCacheEntryListener(userCacheEntryListener, false, false);
    anonymousUsersCache.addClusteredCacheEntryListener(userCacheEntryListener, false, false);
    serversCache.addClusteredCacheEntryListener(serversCacheEntryListener, false, false);
    componentsCache.addClusteredCacheEntryListener(componentsCacheEntryListener, true, true);
    // This is not necessary for the usersSessions cache, because its content is being managed while the content
    // of users cache and anonymous users cache is being managed.
    Log.debug("Simulate 'entryAdded' for all data that already exists elsewhere in the cluster.");
    Stream.concat(usersCache.entrySet().stream(), anonymousUsersCache.entrySet().stream()).filter(entry -> !entry.getValue().getNodeID().equals(XMPPServer.getInstance().getNodeID())).forEach(entry -> userCacheEntryListener.entryAdded(entry.getKey(), entry.getValue(), entry.getValue().getNodeID()));
    serversCache.entrySet().stream().filter(entry -> !entry.getValue().equals(XMPPServer.getInstance().getNodeID())).forEach(entry -> serversCacheEntryListener.entryAdded(entry.getKey(), entry.getValue(), entry.getValue()));
    componentsCache.entrySet().forEach(entry -> {
        entry.getValue().forEach(nodeIdForComponent -> {
            // Iterate over all node ids on which the component is known
            if (!nodeIdForComponent.equals(XMPPServer.getInstance().getNodeID())) {
                // Here we pretend that the component has been added by the node id on which it is reported to
                // be available. This might not have been the case, but it is probably accurate. An alternative
                // approach is not easily available.
                componentsCacheEntryListener.entryAdded(entry.getKey(), entry.getValue(), nodeIdForComponent);
            }
        });
    });
    // Broadcast presence of local sessions to remote sessions when subscribed to presence.
    // Probe presences of remote sessions when subscribed to presence of local session.
    // Send pending subscription requests to local sessions from remote sessions.
    // Deliver offline messages sent to local sessions that were unavailable in other nodes.
    // Send available presences of local sessions to other resources of the same user.
    PresenceUpdateHandler presenceUpdateHandler = XMPPServer.getInstance().getPresenceUpdateHandler();
    for (LocalClientSession session : localRoutingTable.getClientRoutes()) {
        // Simulate that the local session has just become available
        session.setInitialized(false);
        // Simulate that current session presence has just been received
        presenceUpdateHandler.process(session.getPresence());
    }
// TODO OF-2067: the above also (re)generates events on the local node, where these events had already occurred. Ideally, that should not happen.
// TODO OF-2066: shouldn't a similar action be done on the other nodes, so that the node that just joined gets informed about all sessions living on other cluster nodes?
}