de.bmarwell.j9kwsolver.J9kwUserAPI.java Source code

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Here is the source code for de.bmarwell.j9kwsolver.J9kwUserAPI.java

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/**
 * Copyright (c) 2013, Benjamin Marwell.  This file is
 * licensed under the Affero General Public License version 3 or later.  See
 * the COPYRIGHT file.
 */
package de.bmarwell.j9kwsolver;

import java.net.URI;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.commons.lang3.math.NumberUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import de.bmarwell.j9kwsolver.request.UserBalance;
import de.bmarwell.j9kwsolver.service.PropertyService;
import de.bmarwell.j9kwsolver.util.HttpConnectorFactory;
import de.bmarwell.j9kwsolver.util.RequestToURI;

/**
 * An API for retrieving user information.
 * @author Benjamin Marwell
 *
 */
public final class J9kwUserAPI {
    private static final Logger LOG = LoggerFactory.getLogger(J9kwUserAPI.class);
    private static Lock httpLock = new ReentrantLock();

    /**
     * Empty hidden default constructor.
     */
    private J9kwUserAPI() {
    }

    /**
     * Locks the instance.
     */
    private void lock() {
        httpLock.lock();
    }

    /**
     * unlocks the instance.
     */
    private void unlock() {
        httpLock.unlock();
    }

    /**
     * Gets the apikey users's balance.
     * @return - the balance in credits.
     */
    public int getBalance() {
        int balance = -1;

        UserBalance ub = new UserBalance();
        ub.setApikey(PropertyService.getProperty("apikey"));

        lock();
        URI scuri = RequestToURI.userBalanceToURI(ub);
        String userbalanceresponse = HttpConnectorFactory.getBodyFromRequest(scuri);
        LOG.debug("User credits as String: {}.", userbalanceresponse);
        unlock();

        if (NumberUtils.isDigits(userbalanceresponse)) {
            balance = NumberUtils.toInt(userbalanceresponse);
            LOG.debug("User credits as int: {}.", balance);
        }

        return balance;
    }

    /**
     * Returns the only instance of this api.
     * @return instance of this API.
     */
    public static J9kwUserAPI getInstance() {
        return SingletonHolder.instance;
    }

    /**
     * @author Benjamin Marwell
     *
     */
    private static class SingletonHolder {
        private static J9kwUserAPI instance = new J9kwUserAPI();
    }
}