/*
 * 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.phoenix.pherf.workload.mt;

import java.util.List;
import java.util.Properties;
import java.util.concurrent.Callable;
import org.apache.phoenix.pherf.configuration.DataModel;
import org.apache.phoenix.pherf.configuration.Scenario;
import org.apache.phoenix.pherf.util.PhoenixUtil;
import org.apache.phoenix.pherf.workload.Workload;
import org.apache.phoenix.pherf.workload.mt.generators.LoadEventGenerator;
import org.apache.phoenix.pherf.workload.mt.generators.TenantLoadEventGeneratorFactory;
import org.apache.phoenix.pherf.workload.mt.generators.TenantOperationInfo;
import org.apache.phoenix.pherf.workload.mt.handlers.PherfWorkHandler;
import org.apache.phoenix.pherf.workload.mt.operations.TenantOperationFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class creates workload for tenant based load profiles. It uses @see
 * {@link TenantOperationFactory} in conjunction with
 * @see {@link LoadEventGenerator} to generate the load events. It then publishes these events onto
 *      a RingBuffer based queue. The @see {@link TenantOperationWorkHandler} drains the events from
 *      the queue and executes them. Reference for RingBuffer based queue
 *      http://lmax-exchange.github.io/disruptor/
 */

public class MultiTenantWorkload implements Workload {
  private static final Logger LOGGER = LoggerFactory.getLogger(MultiTenantWorkload.class);
  private final TenantLoadEventGeneratorFactory evtGeneratorFactory =
    new TenantLoadEventGeneratorFactory();
  private final LoadEventGenerator<TenantOperationInfo> generator;

  public MultiTenantWorkload(PhoenixUtil phoenixUtil, DataModel model, Scenario scenario,
    Properties properties) {
    this.generator =
      evtGeneratorFactory.newLoadEventGenerator(phoenixUtil, model, scenario, properties);
  }

  public MultiTenantWorkload(PhoenixUtil phoenixUtil, DataModel model, Scenario scenario,
    List<PherfWorkHandler> workHandlers, Properties properties) throws Exception {
    this.generator = evtGeneratorFactory.newLoadEventGenerator(phoenixUtil, model, scenario,
      workHandlers, properties);
  }

  @Override
  public Callable<Void> execute() throws Exception {
    return new Callable<Void>() {
      @Override
      public Void call() throws Exception {
        generator.start();
        return null;
      }
    };
  }

  @Override
  public void complete() {
    try {
      generator.stop();
    } catch (Exception e) {
      LOGGER.error(e.getMessage());
    }
  }
}
