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/*
* Licensed to David Pilato (the "Author") under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Author 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 fr.pilato.elasticsearch.crawler.fs.client;
import fr.pilato.elasticsearch.crawler.fs.meta.settings.TimeValue;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/**
* Bulk processor
*/
public class BulkProcessor {
private static final Logger logger = LogManager.getLogger(BulkProcessor.class);
private final int bulkActions;
private final ElasticsearchClient client;
private final Listener listener;
private BulkRequest bulkRequest;
private final ScheduledExecutorService executor;
private volatile boolean closed = false;
private final AtomicLong executionIdGen = new AtomicLong();
private BulkProcessor(ElasticsearchClient client, Listener listener, int bulkActions, TimeValue flushInterval) {
this.bulkActions = bulkActions;
this.bulkRequest = new BulkRequest();
this.client = client;
this.listener = listener;
if (flushInterval != null) {
executor = Executors.newScheduledThreadPool(1);
executor.scheduleWithFixedDelay(this::executeWhenNeeded, 0, flushInterval.millis(), TimeUnit.MILLISECONDS);
} else {
executor = null;
}
}
public void close() throws InterruptedException {
if (closed) {
return;
}
closed = true;
if (executor != null) {
logger.debug("Closing BulkProcessor");
executor.shutdown();
executor.awaitTermination(10, TimeUnit.SECONDS);
logger.debug("BulkProcessor is now closed");
}
if (bulkRequest.numberOfActions() > 0) {
execute();
}
}
/**
* Adds an {@link IndexRequest} to the list of actions to execute. Follows the same behavior of {@link IndexRequest}
* (for example, if no id is provided, one will be generated, or usage of the create flag).
*/
public BulkProcessor add(IndexRequest request) {
return add((SingleBulkRequest) request);
}
/**
* Adds an {@link DeleteRequest} to the list of actions to execute.
*/
public BulkProcessor add(DeleteRequest request) {
return add((SingleBulkRequest) request);
}
/**
* Adds either a delete or an index request.
*/
private BulkProcessor add(SingleBulkRequest request) {
return internalAdd(request);
}
private void ensureOpen() {
if (closed) {
throw new IllegalStateException("bulk process already closed");
}
}
private synchronized BulkProcessor internalAdd(SingleBulkRequest request) {
ensureOpen();
bulkRequest.add(request);
executeIfNeeded();
return this;
}
private void executeIfNeeded() {
ensureOpen();
if (isOverTheLimit()) {
execute();
}
}
private void executeWhenNeeded() {
ensureOpen();
if (bulkRequest.numberOfActions() > 0) {
execute();
}
}
private void execute() {
final BulkRequest bulkRequest = this.bulkRequest;
this.bulkRequest = new BulkRequest();
final long executionId = executionIdGen.incrementAndGet();
// execute in a blocking fashion...
boolean afterCalled = false;
try {
listener.beforeBulk(executionId, bulkRequest);
BulkResponse bulkItemResponses = client.bulk(bulkRequest);
afterCalled = true;
listener.afterBulk(executionId, bulkRequest, bulkItemResponses);
} catch (Exception e) {
if (!afterCalled) {
listener.afterBulk(executionId, bulkRequest, e);
}
}
}
private boolean isOverTheLimit() {
return (bulkActions != -1) && (bulkRequest.numberOfActions() >= bulkActions);
}
static class Builder {
private int bulkActions;
private TimeValue flushInterval;
private final ElasticsearchClient client;
private final Listener listener;
public Builder(ElasticsearchClient client, Listener listener) {
this.client = client;
this.listener = listener;
}
public Builder setBulkActions(int bulkActions) {
this.bulkActions = bulkActions;
return this;
}
public Builder setFlushInterval(TimeValue flushInterval) {
this.flushInterval = flushInterval;
return this;
}
public BulkProcessor build() {
return new BulkProcessor(client, listener, bulkActions, flushInterval);
}
}
static Builder builder(ElasticsearchClient client, Listener listener) {
return new Builder(client, listener);
}
public interface Listener {
void beforeBulk(long executionId, BulkRequest request);
void afterBulk(long executionId, BulkRequest request, BulkResponse response);
void afterBulk(long executionId, BulkRequest request, Throwable failure);
}
/**
* Build an simple elasticsearch bulk processor
* @param client elasticsearch client
* @param bulkSize bulk size
* @param flushInterval flush interval in milliseconds
* @return a bulk processor
*/
public static BulkProcessor simpleBulkProcessor(ElasticsearchClient client, int bulkSize, TimeValue flushInterval) {
return builder(client, new Listener() {
@Override
public void beforeBulk(long executionId, BulkRequest request) {
logger.debug("Going to execute new bulk composed of {} actions", request.numberOfActions());
}
@Override
public void afterBulk(long executionId, BulkRequest request, BulkResponse response) {
logger.debug("Executed bulk composed of {} actions", request.numberOfActions());
if (response.hasFailures()) {
logger.warn("There was failures while executing bulk", response.buildFailureMessage());
if (logger.isDebugEnabled()) {
for (BulkResponse.BulkItemResponse item : response.getItems()) {
if (item.isFailed()) {
logger.debug("Error for {}/{}/{} for {} operation: {}", item.getIndex(),
item.getType(), item.getId(), item.getOpType(), item.getFailureMessage());
}
}
}
}
}
@Override
public void afterBulk(long executionId, BulkRequest request, Throwable failure) {
logger.warn("Error executing bulk", failure);
}
})
.setBulkActions(bulkSize)
.setFlushInterval(flushInterval)
.build();
}
}
