/*
* Copyright 2014, The OpenNMS Group
*
* Licensed 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.opennms.newts.stress;
import java.util.concurrent.BlockingQueue;
import org.opennms.newts.aggregate.IntervalGenerator;
import org.opennms.newts.api.DefaultSampleProcessorService;
import org.opennms.newts.api.Sample;
import org.opennms.newts.api.SampleRepository;
import org.opennms.newts.api.Timestamp;
import org.opennms.newts.api.query.ResultDescriptor;
import org.opennms.newts.api.query.StandardAggregationFunctions;
import org.opennms.newts.cassandra.CassandraSession;
import org.opennms.newts.cassandra.CassandraSessionImpl;
import org.opennms.newts.cassandra.ContextConfigurations;
import org.opennms.newts.persistence.cassandra.CassandraSampleRepository;
import com.codahale.metrics.MetricRegistry;
import com.google.common.collect.Queues;
/**
* A Stress {@link Dispatcher} that selects {@link Sample samples} using the native API.
*
* @author eevans
*/
public class SelectDispatcher extends Dispatcher {
private final SelectConfig m_config;
private final SampleRepository m_repository;
private final BlockingQueue<Query> m_queryQueue;
SelectDispatcher(SelectConfig config) {
super(config);
m_config = config;
CassandraSession session = new CassandraSessionImpl(
config.getCassandraKeyspace(),
config.getCassandraHost(),
config.getCassandraPort(),
config.getCassandraCompression(),
config.getCassandraUsername(),
config.getCassandraPassword(),
config.getCassandraSsl());
m_repository = new CassandraSampleRepository(
session,
Config.CASSANDRA_TTL,
new MetricRegistry(),
new DefaultSampleProcessorService(1),
new ContextConfigurations());
m_queryQueue = Queues.newArrayBlockingQueue(config.getThreads() * 10);
}
private ResultDescriptor getResultDescriptor() {
ResultDescriptor rDescriptor = new ResultDescriptor(m_config.getInterval());
for (String metric : m_config.getMetrics()) {
rDescriptor.datasource(metric, metric, m_config.getHeartbeat(), StandardAggregationFunctions.AVERAGE);
}
rDescriptor.export(m_config.getMetrics());
return rDescriptor;
}
private void createThreads() {
for (int i = 0; i < m_config.getThreads(); i++) {
m_threads[i] = new Selecter(i, m_repository, getResultDescriptor(), m_queryQueue, m_metricRegistry);
}
}
@Override
void go() throws InterruptedException {
createThreads();
for (Timestamp t : new IntervalGenerator(m_config.getStart(), m_config.getEnd(), m_config.getSelectLength(), true)) {
for (String resource : m_config.getResources()) {
m_queryQueue.put(new Query(resource, t.minus(m_config.getSelectLength()), t, m_config.getResolution()));
}
}
shutdown();
}
}