de.bmarwell.j9kwsolver.util.HttpConnectorFactory.java Source code

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Here is the source code for de.bmarwell.j9kwsolver.util.HttpConnectorFactory.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.util;

import java.io.IOException;
import java.io.StringWriter;
import java.net.URI;

import org.apache.commons.io.IOUtils;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Benjamin Marwell
 * This class will return various connectors, which might prove useful.
 */
public final class HttpConnectorFactory {
    /**
     * Default connect timeout.
     */
    private static final int CONNECT_TIMEOUT_MS = 30000;
    /**
     * Default socket timeout.
     */
    private static final int SOCKET_TIMEOUT_MS = 30000;
    /**
     * Logger instance for this class.
     */
    private static final Logger LOG = LoggerFactory.getLogger(HttpConnectorFactory.class);
    /**
     * The httpClient object for this application / API.
     */
    private static CloseableHttpClient httpClient;

    static {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();

        RequestConfig rc = RequestConfig.copy(RequestConfig.DEFAULT).setSocketTimeout(SOCKET_TIMEOUT_MS)
                .setConnectTimeout(CONNECT_TIMEOUT_MS).build();

        httpClient = HttpClients.custom().setDefaultRequestConfig(rc).setConnectionManager(cm).build();
    }

    /**
     * Empty private default constructor for utility class HttpConnectorFactory.
     */
    private HttpConnectorFactory() {
    }

    /**
     * Returns the single httpClient for this application to use.
     * @return the httpClient to be used for requests.
     */
    public static CloseableHttpClient getHttpClient() {
        return httpClient;
    }

    /**
     * Shuts down the connector instance, if open.
     * @return true if connection could be closed.
     */
    public static boolean shutdownConnector() {
        IOUtils.closeQuietly(httpClient);

        return true;
    }

    /**
     * Returns the Body from the URI via http request.
     * @param uri the URI to get the body from.
     * @return the Body as String.
     */
    public static String getBodyFromRequest(final URI uri) {
        CloseableHttpResponse response = null;
        String responseBody = null;
        HttpGet httpGet = new HttpGet(uri);

        LOG.debug("Requesting URI: {}.", httpGet.getURI());

        try {
            response = httpClient.execute(httpGet);
            StringWriter writer = new StringWriter();
            IOUtils.copy(response.getEntity().getContent(), writer);
            responseBody = writer.toString();
        } catch (IOException e) {
            LOG.error("Fehler beim HTTP Request!", e);
        }

        return responseBody;
    }
}