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

Introduction

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

Source

/**
 * 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 org.apache.drill.exec.exception.StoreException;
import org.apache.drill.exec.store.mongo.DrillMongoConstants;
import org.apache.drill.exec.store.sys.PersistentStore;
import org.apache.drill.exec.store.sys.PersistentStoreConfig;
import org.apache.drill.exec.store.sys.PersistentStoreRegistry;
import org.apache.drill.exec.store.sys.store.provider.BasePersistentStoreProvider;
import org.bson.Document;
import org.bson.conversions.Bson;

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.WriteConcern;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Indexes;

public class MongoPersistentStoreProvider extends BasePersistentStoreProvider {

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

    static final String pKey = "pKey";

    private MongoClient client;

    private MongoCollection<Document> collection;

    private final String mongoURL;

    public MongoPersistentStoreProvider(PersistentStoreRegistry registry) throws StoreException {
        mongoURL = registry.getConfig().getString(DrillMongoConstants.SYS_STORE_PROVIDER_MONGO_URL);
    }

    @Override
    public void start() throws IOException {
        MongoClientURI clientURI = new MongoClientURI(mongoURL);
        client = new MongoClient(clientURI);
        MongoDatabase db = client.getDatabase(clientURI.getDatabase());
        collection = db.getCollection(clientURI.getCollection()).withWriteConcern(WriteConcern.JOURNALED);
        Bson index = Indexes.ascending(pKey);
        collection.createIndex(index);
    }

    @Override
    public <V> PersistentStore<V> getOrCreateStore(PersistentStoreConfig<V> config) {
        switch (config.getMode()) {
        case BLOB_PERSISTENT:
        case PERSISTENT:
            return new MongoPersistentStore<>(config, collection);
        default:
            throw new IllegalStateException();

        }
    }

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

}