/** Load input file */
private void loadInputFile() {
URI_ID = new TObjectIntHashMap<String>();
// load uri--id from input file
TextFileUtils.loadInputURIs(inputFile, URI_ID, false);
logger.debug("Input URIs loading. " + URI_ID.size() + " URIs loaded.");
}
/** Start RDF triple extraction */
private void run() {
// get processors number for multi-threading
int n_threads = Runtime.getRuntime().availableProcessors();
n_threads = 4;
logger.debug("Threads number: " + n_threads);
ExecutorService executor;
executor = Executors.newFixedThreadPool(n_threads);
metadata_counter = new SynchronizedCounter();
properties_counter = new SynchronizedCounter();
metadata_index = new TObjectIntHashMap<String>();
props_index = new TObjectIntHashMap<String>();
logger.info("Risorse da interrogare: " + num_items);
try {
TextFileManager textWriter = null;
if (outputTextFormat) textWriter = new TextFileManager(textFile);
ItemFileManager fileManager = new ItemFileManager(metadataFile, ItemFileManager.WRITE);
for (int i = 0; i < num_items; i++) {
String uri = (String) URI_ID.keys()[i];
Runnable worker;
if (model == null) {
// create worker thread - extraction from endpoint
worker =
new QueryExecutor(
uri,
URI_ID.get(uri),
props_index,
graphURI,
endpoint,
metadata_counter,
properties_counter,
metadata_index,
textWriter,
fileManager,
depth);
} else {
// create worker thread - extraction from tdb local dataset
worker =
new QueryExecutor(
uri,
URI_ID.get(uri),
props_index,
graphURI,
endpoint,
metadata_counter,
properties_counter,
metadata_index,
textWriter,
fileManager,
depth,
model);
}
executor.execute(worker);
}
// This will make the executor accept no new threads
// and finish all existing threads in the queue
executor.shutdown();
// Wait until all threads are finish
executor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
if (textWriter != null) textWriter.close();
fileManager.close();
} catch (Exception e) {
e.printStackTrace();
}
// write metadata index file
TextFileUtils.writeData(metadataFile + "_index", metadata_index);
// write metadata index file
TextFileUtils.writeData("props_index", props_index);
}