external/storm-elasticsearch/src/main/java/org/apache/storm/elasticsearch/trident/EsStateFactory.java

/**
 * 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.storm.elasticsearch.trident;

import org.apache.storm.task.IMetricsContext;
import org.apache.storm.elasticsearch.common.EsConfig;
import org.apache.storm.elasticsearch.common.EsTupleMapper;

import org.apache.storm.trident.state.State;
import org.apache.storm.trident.state.StateFactory;

import java.util.Map;

import static org.elasticsearch.common.base.Preconditions.checkNotNull;

/**
 * StateFactory for providing EsState.
 * @since 0.11
 */
public class EsStateFactory implements StateFactory {
    private final EsConfig esConfig;
    private final EsTupleMapper tupleMapper;

    /**
     * EsStateFactory constructor
     * @param esConfig Elasticsearch configuration containing node addresses and cluster name {@link EsConfig}
     * @param tupleMapper Tuple to ES document mapper {@link EsTupleMapper}
     */
    public EsStateFactory(EsConfig esConfig, EsTupleMapper tupleMapper) {
        this.esConfig = checkNotNull(esConfig);
        this.tupleMapper = checkNotNull(tupleMapper);
    }

    @Override
    public State makeState(Map conf, IMetricsContext metrics, int partitionIndex, int numPartitions) {
        EsState esState = new EsState(esConfig, tupleMapper);
        esState.prepare();
        return esState;
    }
}