Handler for revisions obtained by the client.
Resolves a session and source into a
An interface for replicating files.
A revision comprises lists of files that come from different sources and need to be replicated together to e.g.
A client which monitors and obtains new revisions from a
Describes a file in a
Token for a replication session, for guaranteeing that source replicated files will be kept safe until the replication completes.
Exception indicating that a revision update session was expired due to lack of activity.
The replication framework supports replicating any type of files, with built-in support for a single search index as well as an index and taxonomy pair. For a single index, the application should publish an IndexRevision and set IndexReplicationHandler on the client. For an index and taxonomy pair, the application should publish an IndexAndTaxonomyRevision and set IndexAndTaxonomyReplicationHandler on the client.
When the replication client detects that there is a newer revision available, it copies the files of the revision and then invokes the handler to complete the operation (e.g. copy the files to the index directory, fsync them, reopen an index reader etc.). By default, only files that do not exist in the handler's current revision files are copied, however this can be overridden by extending the client.
An example usage of the Replicator:
// ++++++++++++++ SERVER SIDE ++++++++++++++ // IndexWriter publishWriter; // the writer used for indexing Replicator replicator = new LocalReplicator(); replicator.publish(new IndexRevision(publishWriter)); // ++++++++++++++ CLIENT SIDE ++++++++++++++ // // either LocalReplictor, or HttpReplicator if client and server are on different nodes Replicator replicator; // callback invoked after handler finished handling the revision and e.g. can reopen the reader. Callable<Boolean> callback = null; // can also be null if no callback is needed ReplicationHandler handler = new IndexReplicationHandler(indexDir, callback); SourceDirectoryFactory factory = new PerSessionDirectoryFactory(workDir); ReplicationClient client = new ReplicationClient(replicator, handler, factory); // invoke client manually client.updateNow(); // or, periodically client.startUpdateThread(100); // check for update every 100 milliseconds
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