All Downloads are FREE. Search and download functionalities are using the official Maven repository.

bluecrystal.service.loader.ExternalLoaderHttp Maven / Gradle / Ivy

There is a newer version: 1.16.0
Show newest version
/*
    Blue Crystal: Document Digital Signature Tool
    Copyright (C) 2007-2015  Sergio Leal

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */


package bluecrystal.service.loader;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ExternalLoaderHttp {
	static final Logger LOG = LoggerFactory.getLogger(ExternalLoaderHttp.class);
	private static final int BUFFER_SIZE = 64 * 1024;

	public ExternalLoaderHttp() {
		super();
	}

	public static byte[] getfromUrl(String url) throws MalformedURLException,
			IOException {
		URLConnection conn = createConn(url);
		byte[] ret = null;
		try {
			ret = getBinResponse(conn);
		} catch (Throwable e) {
			LOG.error("Could not load through HTTP(S) "+ url, e);
			throw new RuntimeException(e);
		}

		return ret;
	}

	private static byte[] getBinResponse(URLConnection conn) throws Exception {
		List buffer = new ArrayList();
		byte[] ret = null;
		InputStream is = conn.getInputStream();
		int size = 0, readLen = 0;
		readLen = is.available() < BUFFER_SIZE ? is.available() : BUFFER_SIZE;
		ret = new byte[readLen];
		int gotFromIs = is.read(ret);
		int cnt = 0;

		while (gotFromIs != -1) {
			if (gotFromIs > 0) {
				buffer.add(ret);
				if (readLen > 0 || gotFromIs > 0 ) {
					LOG.debug("# [" + cnt +"]" + size + " => " + readLen + " : "+gotFromIs);
				} else {
					LOG.debug("*");
				}
					
				size += ret.length;
			}
			readLen = is.available() < BUFFER_SIZE ? is.available()
					: BUFFER_SIZE;
			for (int i = 0; i < 5; i++) {
				if (readLen != 0) {
					ret = new byte[readLen];
					break;
				} 
				Thread.sleep(500);
				readLen = is.available() < BUFFER_SIZE ? is.available()
						: BUFFER_SIZE;
			}

			gotFromIs = is.read(ret);
			cnt += 1;
	}
		
		
		
		if (is.read() != -1) {
		}

		int index = 0;
		Iterator it = buffer.iterator();
		ret = new byte[size];
		while (it.hasNext()) {
			byte[] nextBuff = (byte[]) it.next();
			LOG.debug("cp (" + ret.length + ") : " + index + " => "
					+ nextBuff.length);
			System.arraycopy(nextBuff, 0, ret, index, nextBuff.length);
			index += nextBuff.length;
		}

		return ret;
	}

	private static URLConnection createConn(String serverUrl)
			throws MalformedURLException, IOException {
		URL url = new URL(serverUrl);
		URLConnection conn = url.openConnection();
		return conn;
	}

}




© 2015 - 2025 Weber Informatics LLC | Privacy Policy