eu.over9000.skadi.service.DownloadService.java Source code

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Here is the source code for eu.over9000.skadi.service.DownloadService.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2015 s1mpl3x <jan[at]over9000.eu>
 *
 * 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 eu.over9000.skadi.service;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javafx.concurrent.Service;
import javafx.concurrent.Task;

import org.apache.commons.io.FileUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.DefaultHostnameVerifier;
import org.apache.http.impl.client.HttpClientBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DownloadService extends Service<File> {
    private final static Logger LOGGER = LoggerFactory.getLogger(DownloadService.class);

    private static final int BUFFER_SIZE = 1024 * 8;
    private static final int NANOS_IN_SECOND = 1_000_000_000;

    private HttpClient httpClient;
    private String remoteUrl;
    private File localFile;

    public DownloadService(String remoteUrl, File localFile) {
        this.httpClient = HttpClientBuilder.create().setSSLHostnameVerifier(new DefaultHostnameVerifier()).build();

        this.remoteUrl = remoteUrl;
        this.localFile = localFile;
    }

    @Override
    protected Task<File> createTask() {
        return new Task<File>() {
            protected File call() throws Exception {
                LOGGER.info(String.format("Downloading file %s to %s", DownloadService.this.remoteUrl,
                        DownloadService.this.localFile.getAbsolutePath()));

                HttpGet httpGet = new HttpGet(DownloadService.this.remoteUrl);
                HttpResponse response = DownloadService.this.httpClient.execute(httpGet);
                OutputStream localFileStream = null;

                try (InputStream remoteContentStream = response.getEntity().getContent()) {
                    long fileSize = response.getEntity().getContentLength();
                    LOGGER.debug(String.format("Size of file to download is %s", fileSize));

                    localFileStream = new FileOutputStream(DownloadService.this.localFile);
                    byte[] buffer = new byte[BUFFER_SIZE];
                    int sizeOfChunk;
                    int amountComplete = 0;
                    long startTime = System.nanoTime();
                    while ((sizeOfChunk = remoteContentStream.read(buffer)) != -1) {
                        if (this.isCancelled()) {
                            this.updateMessage("Download cancelled");
                            return null;
                        }

                        localFileStream.write(buffer, 0, sizeOfChunk);

                        amountComplete += sizeOfChunk;
                        this.updateProgress(amountComplete, fileSize);

                        long bytesec = (long) ((double) amountComplete / (System.nanoTime() - startTime)
                                * NANOS_IN_SECOND);

                        this.updateMessage(String.format("Downloaded %s of %s kB (%d%% @%s/s)",
                                FileUtils.byteCountToDisplaySize(amountComplete),
                                FileUtils.byteCountToDisplaySize(fileSize),
                                (int) ((double) amountComplete / (double) fileSize * 100.0),
                                FileUtils.byteCountToDisplaySize(bytesec)));

                    }
                    this.updateMessage("Download completed");
                    return DownloadService.this.localFile;
                } finally {
                    if (localFileStream != null) {
                        localFileStream.close();
                    }
                }
            }
        };
    }

}