content: /**
   * 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.bigtop.datagenerators.bigpetstore.generators.transaction;
  
  import org.apache.bigtop.datagenerators.samplers.SeedFactory;
  import org.apache.bigtop.datagenerators.samplers.samplers.ExponentialSampler;
  import org.apache.bigtop.datagenerators.samplers.samplers.Sampler;
  import org.apache.bigtop.datagenerators.samplers.samplers.StatefulMonteCarloSampler;
  
  public class TransactionTimeSamplerBuilder
  {
  	private final SeedFactory seedFactory;
  	private CustomerInventory customerInventory;
  	private CustomerTransactionParameters transactionParameters;
  
  	public TransactionTimeSamplerBuilder(SeedFactory seedFactory)
  	{
  		this.seedFactory = seedFactory;
  	}
  
  	public void setCustomerInventory(CustomerInventory inventory)
  	{
  		this.customerInventory = inventory;
  	}
  
  	public void setCustomerTransactionParameters(CustomerTransactionParameters parameters)
  	{
  		this.transactionParameters = parameters;
  	}
  
  	public Sampler<Double> build()
  	{
  		double lambda = 1.0 / transactionParameters.getAverageTransactionTriggerTime();
  		Sampler<Double> arrivalTimeSampler = new ExponentialSampler(lambda, seedFactory);
  		Sampler<Double> proposedTimeSampler = new ProposedPurchaseTimeSampler(customerInventory,
  				arrivalTimeSampler);
  
  		return new StatefulMonteCarloSampler<Double>(proposedTimeSampler,
  				new TransactionTimePDF(),
  				0.0,
  				seedFactory);
  	}
  }
  