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This project contains an abstract implementation of an ElasticSearch River and is used as a basis for custom river implementations.

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package com.thematchbox.river.batch;

/* Copyright 2015 theMatchBox

   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.
*/


import com.thematchbox.river.actions.IndexJob;
import com.thematchbox.river.data.PersistentObject;
import com.thematchbox.river.sessions.SessionDelegator;
import com.thematchbox.river.sessions.SessionException;
import org.elasticsearch.client.Client;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class BatchSessionDelegator, T extends PersistentObject> implements SessionDelegator{

    private ItemContainer itemContainer;
    private Map itemMap;

    public BatchSessionDelegator(ItemContainer itemContainer) {
        this.itemContainer = itemContainer;
        itemMap = new HashMap<>();
        for (T item : itemContainer.getItems()) {
            itemMap.put(item.getId(), item);
        }
    }

    @Override
    public void openSession() throws SessionException {
    }

    @Override
    public void closeSession() throws SessionException {
    }

    @Override
    public void reset() {
    }

    @Override
    public List getObjects(Class clazz, List ids) throws SessionException {
        List objects = new ArrayList<>(ids.size());
        for (S id : ids) {
            objects.add(itemMap.get(id));
        }
        return objects;
    }

    @Override
    public List getAllIds(Class clazz, Client client, IndexJob indexJob) throws SessionException {
        return itemContainer.getIds();
    }
}