com.iluwatar.hexagonal.banking.MongoBank.java Source code

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Here is the source code for com.iluwatar.hexagonal.banking.MongoBank.java

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/**
 * The MIT License
 * Copyright (c) 2014-2016 Ilkka Seppl
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.hexagonal.banking;

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.UpdateOptions;
import org.bson.Document;

import java.util.ArrayList;
import java.util.List;

/**
 * Mongo based banking adapter
 */
public class MongoBank implements WireTransfers {

    private static final String DEFAULT_DB = "lotteryDB";
    private static final String DEFAULT_ACCOUNTS_COLLECTION = "accounts";

    private MongoClient mongoClient;
    private MongoDatabase database;
    private MongoCollection<Document> accountsCollection;

    /**
     * Constructor
     */
    public MongoBank() {
        connect();
    }

    /**
     * Constructor accepting parameters
     */
    public MongoBank(String dbName, String accountsCollectionName) {
        connect(dbName, accountsCollectionName);
    }

    /**
     * Connect to database with default parameters
     */
    public void connect() {
        connect(DEFAULT_DB, DEFAULT_ACCOUNTS_COLLECTION);
    }

    /**
     * Connect to database with given parameters
     */
    public void connect(String dbName, String accountsCollectionName) {
        if (mongoClient != null) {
            mongoClient.close();
        }
        mongoClient = new MongoClient(System.getProperty("mongo-host"),
                Integer.parseInt(System.getProperty("mongo-port")));
        database = mongoClient.getDatabase(dbName);
        accountsCollection = database.getCollection(accountsCollectionName);
    }

    /**
     * @return mongo client
     */
    public MongoClient getMongoClient() {
        return mongoClient;
    }

    /**
     *
     * @return mongo database
     */
    public MongoDatabase getMongoDatabase() {
        return database;
    }

    /**
     *
     * @return accounts collection
     */
    public MongoCollection<Document> getAccountsCollection() {
        return accountsCollection;
    }

    @Override
    public void setFunds(String bankAccount, int amount) {
        Document search = new Document("_id", bankAccount);
        Document update = new Document("_id", bankAccount).append("funds", amount);
        accountsCollection.updateOne(search, new Document("$set", update), new UpdateOptions().upsert(true));
    }

    @Override
    public int getFunds(String bankAccount) {
        Document search = new Document("_id", bankAccount);
        List<Document> results = accountsCollection.find(search).limit(1).into(new ArrayList<Document>());
        if (results.size() > 0) {
            return results.get(0).getInteger("funds");
        } else {
            return 0;
        }
    }

    @Override
    public boolean transferFunds(int amount, String sourceBackAccount, String destinationBankAccount) {
        int sourceFunds = getFunds(sourceBackAccount);
        if (sourceFunds < amount) {
            return false;
        } else {
            int destFunds = getFunds(destinationBankAccount);
            setFunds(sourceBackAccount, sourceFunds - amount);
            setFunds(destinationBankAccount, destFunds + amount);
            return true;
        }
    }
}