org.apache.drill.exec.store.mongo.config.MongoPStoreProvider.java Source code

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Here is the source code for org.apache.drill.exec.store.mongo.config.MongoPStoreProvider.java

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/**
 * 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.drill.exec.store.mongo.config;

import java.io.IOException;
import java.util.concurrent.ConcurrentMap;

import org.apache.drill.exec.store.mongo.DrillMongoConstants;
import org.apache.drill.exec.store.sys.EStore;
import org.apache.drill.exec.store.sys.PStore;
import org.apache.drill.exec.store.sys.PStoreConfig;
import org.apache.drill.exec.store.sys.PStoreProvider;
import org.apache.drill.exec.store.sys.PStoreRegistry;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.WriteConcern;
import org.apache.drill.exec.store.sys.local.LocalEStoreProvider;
import org.apache.drill.exec.store.sys.local.MapEStore;

public class MongoPStoreProvider implements PStoreProvider, DrillMongoConstants {

    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MongoPStoreProvider.class);

    static final String pKey = "pKey";

    private MongoClient client;

    private DBCollection collection;

    private final String mongoURL;
    private final LocalEStoreProvider localEStoreProvider;

    public MongoPStoreProvider(PStoreRegistry registry) {
        mongoURL = registry.getConfig().getString(SYS_STORE_PROVIDER_MONGO_URL);
        localEStoreProvider = new LocalEStoreProvider();
    }

    @Override
    public void start() throws IOException {
        MongoClientURI clientURI = new MongoClientURI(mongoURL);
        client = new MongoClient(clientURI);
        DB db = client.getDB(clientURI.getDatabase());
        collection = db.getCollection(clientURI.getCollection());
        collection.setWriteConcern(WriteConcern.JOURNALED);
        DBObject index = new BasicDBObject(1).append(pKey, Integer.valueOf(1));
        collection.createIndex(index);
    }

    @Override
    public <V> PStore<V> getStore(PStoreConfig<V> config) throws IOException {
        switch (config.getMode()) {
        case BLOB_PERSISTENT:
        case PERSISTENT:
            return new MongoPStore<>(config, collection);
        case EPHEMERAL:
            return localEStoreProvider.getStore(config);
        default:
            throw new IllegalStateException();

        }
    }

    @Override
    public void close() {
        if (client != null) {
            client.close();
        }
    }

}