HttpUtils.java

/*
 * The MIT License
 *
 * Copyright 2014 Miroslav Cupak (mirocupak@gmail.com).
 *
 * 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.dnastack.bob.service.fetcher.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.enterprise.context.Dependent;
import javax.inject.Inject;
import javax.inject.Named;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.jboss.logging.Logger;

import static com.dnastack.bob.service.util.Constants.REQUEST_TIMEOUT;

/**
 * Util methods for querying over HTTP.
 *
 * @author Miroslav Cupak (mirocupak@gmail.com)
 * @version 1.0
 */
@Named
@Dependent
public class HttpUtils {

    @Inject
    private Logger logger;

    private CloseableHttpClient httpClient;

    @PostConstruct
    private void init() {
        RequestConfig config = RequestConfig.custom().setSocketTimeout(REQUEST_TIMEOUT * 1000).setConnectTimeout(REQUEST_TIMEOUT * 1000).setConnectionRequestTimeout(REQUEST_TIMEOUT * 1000).build();
        httpClient = HttpClients.custom().setDefaultRequestConfig(config).build();
    }

    @PreDestroy
    private void close() {
        if (httpClient != null) {
            try {
                httpClient.close();
            } catch (IOException ex) {
                logger.error(ex.getMessage());
            }
        }
    }

    private HttpGet createGet(String url) {
        HttpGet httpGet;
        httpGet = new HttpGet(url);

        return httpGet;
    }

    private HttpPost createPost(String url, List<NameValuePair> data) throws UnsupportedEncodingException {
        HttpPost httpPost = new HttpPost(url);
        httpPost.setEntity(new UrlEncodedFormEntity(data));

        return httpPost;
    }

    /**
     * Creates a GET/POST request object.
     *
     * @param url  url
     * @param post true if we want to create a POST, false for GET
     * @param data payload (only needed for POST)
     *
     * @return request
     *
     * @throws UnsupportedEncodingException
     */
    public HttpRequestBase createRequest(String url, boolean post, List<NameValuePair> data) throws UnsupportedEncodingException {
        return (post) ? createPost(url, data) : createGet(url);
    }

    /**
     * Executes GET/POST and obtain the response.
     *
     * @param request request
     *
     * @return response
     */
    public String executeRequest(HttpRequestBase request) {
        String response = null;

        CloseableHttpResponse res = null;
        try {
            res = httpClient.execute(request);
            StatusLine line = res.getStatusLine();
            int status = line.getStatusCode();
            HttpEntity entity = res.getEntity();
            response = (entity == null) ? null : EntityUtils.toString(entity);
        } catch (IOException ex) {
            logger.error(ex.getMessage());
        } finally {
            try {
                if (res != null) {
                    res.close();
                }
            } catch (IOException ex) {
                logger.error(ex.getMessage());
            }
        }
        return response;
    }
}