Examples with LineBasedEntityIterator org.apache.stanbol.entityhub.indexing.core.source.LineBasedEntityIterator used on opensource projects

Example 1 with LineBasedEntityIterator

use of org.apache.stanbol.entityhub.indexing.core.source.LineBasedEntityIterator in project stanbol by apache.

the class IndexerImpl method postProcessEntities.

@Override
public void postProcessEntities() {
    synchronized (stateSync) {
        //ensure that two threads do not start the
        //initialisation at the same time ...
        State state = getState();
        if (state.ordinal() < State.INDEXED.ordinal()) {
            throw new IllegalStateException("The Indexer MUST BE already " + State.INDEXED + " when calling this Method!");
        }
        if (state != State.INDEXED) {
            // ignore this call
            return;
        }
        setState(State.POSTPROCESSING);
        log.info("{}: PostProcessing started ...", name);
    }
    if (entityPostProcessors == null || entityPostProcessors.isEmpty()) {
        setState(State.POSTPROCESSED);
        //nothing to do
        return;
    }
    //init the post processing components
    //use an EntityDataProvider based on the indexed data
    EntityDataProvider dataProvider = new YardEntityDataProvider(indexingDestination.getYard());
    //use an LineBasedEntityIterator to iterate over the indexed entity ids
    EntityIterator entityIterator;
    try {
        entityIterator = new LineBasedEntityIterator(getEntityIdFileInputStream(), "UTF-8", null);
    } catch (IOException e) {
        throw new IllegalStateException("Unable to open file containing the " + "IDs of the indexed Entities!", e);
    }
    Map<String, Object> config = new HashMap<String, Object>();
    config.put(LineBasedEntityIterator.PARAM_ID_POS, 1);
    config.put(LineBasedEntityIterator.PARAM_SCORE_POS, Integer.MAX_VALUE);
    entityIterator.setConfiguration(config);
    //does not really make sense for processors
    for (EntityProcessor processor : entityPostProcessors) {
        if (processor.needsInitialisation()) {
            processor.initialise();
        }
    }
    //NOTE the destination needs not to be initialised -> it will be the same
    //as for indexing!
    //initialisation complete ... now setup the poet processing
    //init the queues
    int queueSize = Math.max(MIN_QUEUE_SIZE, chunkSize * 2);
    BlockingQueue<QueueItem<Representation>> indexedEntityQueue = new ArrayBlockingQueue<QueueItem<Representation>>(queueSize);
    BlockingQueue<QueueItem<Representation>> processedEntityQueue = new ArrayBlockingQueue<QueueItem<Representation>>(queueSize);
    BlockingQueue<QueueItem<Representation>> finishedEntityQueue = new ArrayBlockingQueue<QueueItem<Representation>>(queueSize);
    BlockingQueue<QueueItem<IndexingError>> errorEntityQueue = new ArrayBlockingQueue<QueueItem<IndexingError>>(queueSize);
    //Set holding all active post processing deamons
    final SortedSet<IndexingDaemon<?, ?>> activeIndexingDeamons = new TreeSet<IndexingDaemon<?, ?>>();
    //create the IndexingDaemos
    //TODO: Here we would need to create multiple instances in case
    //      one would e.g. like to use several threads for processing entities
    //(1) the daemon reading from the IndexingSources
    String entitySourceReaderName = name + ": post-processing: Entity Reader Deamon";
    activeIndexingDeamons.add(new EntityIdBasedIndexingDaemon(entitySourceReaderName, indexedEntityQueue, errorEntityQueue, entityIterator, dataProvider, //no score normaliser
    null, //post-process all indexed entities
    true));
    //(2) The daemon for post-processing the entities
    activeIndexingDeamons.add(new EntityProcessorRunnable(name + ": post-processing: Entity Processor Deamon", //it consumes indexed Entities
    indexedEntityQueue, //it produces processed Entities
    processedEntityQueue, errorEntityQueue, entityPostProcessors, //      parsed by the used LineBasedEntityIterator!
    Collections.singleton(//ensure the score not changed
    SCORE_FIELD)));
    //(3) The daemon for persisting the entities
    activeIndexingDeamons.add(new EntityPersisterRunnable(name + ": Entity Perstisting Deamon", //it consumes processed Entities
    processedEntityQueue, //it produces finished Entities
    finishedEntityQueue, errorEntityQueue, chunkSize, indexingDestination.getYard()));
    //(4) The daemon for logging finished entities
    activeIndexingDeamons.add(new FinishedEntityDaemon(name + ": Finished Entity Logger Deamon", finishedEntityQueue, -1, log, //we have already all entity ids!
    null));
    //(5) The daemon for logging errors
    activeIndexingDeamons.add(new EntityErrorLoggerDaemon(name + ": Entity Error Logging Daemon", errorEntityQueue, log));
    //start post-processing and wait until it has finished
    startAndWait(activeIndexingDeamons);
    //close all post processors
    for (EntityProcessor ep : entityPostProcessors) {
        ep.close();
    }
    setState(State.POSTPROCESSED);
}