/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nifi.provenance.index.lucene;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.nifi.provenance.ProvenanceEventRecord;
import org.apache.nifi.provenance.SearchableFields;
import org.apache.nifi.provenance.search.Query;
import org.apache.nifi.provenance.search.SearchTerm;
import org.apache.nifi.provenance.serialization.StorageSummary;
import org.apache.nifi.util.RingBuffer;
public class LatestEventsPerProcessorQuery implements CachedQuery {
private static final String COMPONENT_ID_FIELD_NAME = SearchableFields.ComponentID.getSearchableFieldName();
private final ConcurrentMap<String, RingBuffer<Long>> latestRecords = new ConcurrentHashMap<>();
@Override
public void update(final ProvenanceEventRecord event, final StorageSummary storageSummary) {
final String componentId = event.getComponentId();
final RingBuffer<Long> ringBuffer = latestRecords.computeIfAbsent(componentId, id -> new RingBuffer<>(1000));
ringBuffer.add(storageSummary.getEventId());
}
@Override
public Optional<List<Long>> evaluate(final Query query) {
if (query.getMaxResults() > 1000) {
// If query max results > 1000 then we know we don't have enough results. So just return empty.
return Optional.empty();
}
final List<SearchTerm> terms = query.getSearchTerms();
if (terms.size() != 1) {
return Optional.empty();
}
final SearchTerm term = terms.get(0);
if (!COMPONENT_ID_FIELD_NAME.equals(term.getSearchableField().getSearchableFieldName())) {
return Optional.empty();
}
if (query.getEndDate() != null || query.getStartDate() != null) {
return Optional.empty();
}
final RingBuffer<Long> ringBuffer = latestRecords.get(term.getValue());
if (ringBuffer == null || ringBuffer.getSize() < query.getMaxResults()) {
return Optional.empty();
}
List<Long> eventIds = ringBuffer.asList();
if (eventIds.size() > query.getMaxResults()) {
eventIds = eventIds.subList(0, query.getMaxResults());
}
return Optional.of(eventIds);
}
}