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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;

/* 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.rest.RestIndexerStatusAction;
import com.thematchbox.river.rest.RestRebuildIndexAction;
import com.thematchbox.river.rest.RestResetIndexerStatusAction;
import com.thematchbox.river.rest.RestUpdateIndexAction;
import org.elasticsearch.common.inject.Module;
import org.elasticsearch.plugins.AbstractPlugin;
import org.elasticsearch.rest.RestModule;
import org.elasticsearch.river.RiversModule;

import java.util.Collection;
import java.util.Collections;

@SuppressWarnings("UnusedDeclaration")
public abstract class MatchBoxRiverPlugin extends AbstractPlugin {

    private final String riverName;

    protected MatchBoxRiverPlugin(String riverName) {
        this.riverName = riverName;
    }

    @Override
    public void processModule(Module module) {
        if (module instanceof RiversModule) {
            RiversModule riversModule = RiversModule.class.cast(module);
            riversModule.registerRiver(riverName, MatchBoxRiverModule.class);
        } else if (module instanceof RestModule) {
            RestModule restModule = RestModule.class.cast(module);
            restModule.addRestAction(RestRebuildIndexAction.class);
            restModule.addRestAction(RestUpdateIndexAction.class);
            restModule.addRestAction(RestIndexerStatusAction.class);
            restModule.addRestAction(RestResetIndexerStatusAction.class);
        }
    }

    protected abstract Class getRiverStatusModuleClass();

    @Override
    public Collection> modules() {
        return Collections.>singletonList(getRiverStatusModuleClass());
    }
}