/*
* 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 com.hmsonline.storm.cassandra.trident;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import storm.trident.state.State;
import storm.trident.state.StateFactory;
import backtype.storm.task.IMetricsContext;
import backtype.storm.utils.Utils;
import com.hmsonline.storm.cassandra.StormCassandraConstants;
import com.hmsonline.storm.cassandra.client.AstyanaxClient;
import com.hmsonline.storm.cassandra.client.AstyanaxClientFactory;
import com.hmsonline.storm.cassandra.exceptions.ExceptionHandler;
public class CassandraStateFactory implements StateFactory {
private static final long serialVersionUID = 1055824326488179872L;
private static final Logger LOG = LoggerFactory.getLogger(CassandraStateFactory.class);
private String cassandraClusterId;
private ExceptionHandler exceptionHandler;
/**
* @param Identifier that uniquely identifies the Cassandra Cluster
*/
public CassandraStateFactory(String cassandraClusterId) {
this(cassandraClusterId, null);
}
/**
* @param cassandraClusterId Identifier that uniquely identifies the Cassandra Cluster
* @param exceptionHandler
*/
public CassandraStateFactory(String cassandraClusterId, ExceptionHandler exceptionHandler) {
this.cassandraClusterId = cassandraClusterId;
this.exceptionHandler = exceptionHandler;
}
/* (non-Javadoc)
* @see storm.trident.state.StateFactory#makeState(java.util.Map, backtype.storm.task.IMetricsContext, int, int)
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public State makeState(Map conf, IMetricsContext metrics, int partitionIndex, int numPartitions) {
LOG.info("Making new CassandraState object for cluster " + cassandraClusterId + ": partition [" + partitionIndex + "] of [" + numPartitions + "]");
AstyanaxClient client = AstyanaxClientFactory.getInstance(cassandraClusterId, (Map)conf.get(cassandraClusterId));
int batchMaxSize = Utils.getInt(Utils.get(conf, StormCassandraConstants.CASSANDRA_BATCH_MAX_SIZE,
CassandraState.DEFAULT_MAX_BATCH_SIZE));
return new CassandraState(client, batchMaxSize, this.exceptionHandler);
}
}