/*
* 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
*
* 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.streams.elasticsearch;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsPersistWriter;
import org.elasticsearch.action.delete.DeleteRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.Objects;
/**
* ElasticsearchPersistDeleter deletes documents from elasticsearch.
*/
public class ElasticsearchPersistDeleter extends ElasticsearchPersistWriter implements StreamsPersistWriter {
private static final String STREAMS_ID = ElasticsearchPersistDeleter.class.getCanonicalName();
private static final Logger LOGGER = LoggerFactory.getLogger(ElasticsearchPersistDeleter.class);
public ElasticsearchPersistDeleter() {
super();
}
public ElasticsearchPersistDeleter(ElasticsearchWriterConfiguration config) {
super(config);
}
@Override
public String getId() {
return STREAMS_ID;
}
@Override
public void write(StreamsDatum streamsDatum) {
if ( streamsDatum == null || streamsDatum.getDocument() == null) {
return;
}
LOGGER.debug("Delete Document: {}", streamsDatum.getDocument());
Map<String, Object> metadata = streamsDatum.getMetadata();
LOGGER.debug("Delete Metadata: {}", metadata);
String index = ElasticsearchMetadataUtil.getIndex(metadata, config);
String type = ElasticsearchMetadataUtil.getType(metadata, config);
String id = ElasticsearchMetadataUtil.getId(streamsDatum);
try {
delete(index, type, id);
} catch (Throwable ex) {
LOGGER.warn("Unable to Delete Document from ElasticSearch: {}", ex.getMessage());
}
}
/**
* Prepare and en-queue @see org.elasticsearch.action.delete.DeleteRequest
* @param index index
* @param type type
* @param id id
*/
public void delete(String index, String type, String id) {
DeleteRequest deleteRequest;
Objects.requireNonNull(index);
Objects.requireNonNull(id);
Objects.requireNonNull(type);
// They didn't specify an ID, so we will create one for them.
deleteRequest = new DeleteRequest()
.index(index)
.type(type)
.id(id);
add(deleteRequest);
}
/**
* Enqueue DeleteRequest.
* @param request request
*/
public void add(DeleteRequest request) {
Objects.requireNonNull(request);
Objects.requireNonNull(request.index());
// If our queue is larger than our flush threshold, then we should flush the queue.
synchronized (this) {
checkIndexImplications(request.index());
bulkRequest.add(request);
currentBatchItems.incrementAndGet();
checkForFlush();
}
}
}