com.ning.http.client.resumable.PropertiesBasedResumableProcessor Maven / Gradle / Ivy
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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and
asynchronously process the HTTP responses.
/*
* Copyright (c) 2010-2012 Sonatype, Inc. All rights reserved.
*
* This program is licensed to you under the Apache License Version 2.0,
* and you may not use this file except in compliance with the Apache License Version 2.0.
* You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the Apache License Version 2.0 is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
*/
package com.ning.http.client.resumable;
import static java.nio.charset.StandardCharsets.*;
import static com.ning.http.util.MiscUtils.closeSilently;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Scanner;
import java.util.concurrent.ConcurrentHashMap;
/**
* A {@link com.ning.http.client.resumable.ResumableAsyncHandler.ResumableProcessor} which use a properties file
* to store the download index information.
*/
public class PropertiesBasedResumableProcessor implements ResumableAsyncHandler.ResumableProcessor {
private final static Logger log = LoggerFactory.getLogger(PropertiesBasedResumableProcessor.class);
private final static File TMP = new File(System.getProperty("java.io.tmpdir"), "ahc");
private final static String storeName = "ResumableAsyncHandler.properties";
private final ConcurrentHashMap properties = new ConcurrentHashMap<>();
@Override
public void put(String url, long transferredBytes) {
properties.put(url, transferredBytes);
}
@Override
public void remove(String uri) {
if (uri != null) {
properties.remove(uri);
}
}
@Override
public void save(Map map) {
log.debug("Saving current download state {}", properties.toString());
FileOutputStream os = null;
try {
if (!TMP.exists() && !TMP.mkdirs()) {
throw new IllegalStateException("Unable to create directory: " + TMP.getAbsolutePath());
}
File f = new File(TMP, storeName);
if (!f.exists() && !f.createNewFile()) {
throw new IllegalStateException("Unable to create temp file: " + f.getAbsolutePath());
}
if (!f.canWrite()) {
throw new IllegalStateException();
}
os = new FileOutputStream(f);
for (Map.Entry e : properties.entrySet()) {
os.write((append(e)).getBytes(UTF_8));
}
os.flush();
} catch (Throwable e) {
log.warn(e.getMessage(), e);
} finally {
if (os != null)
closeSilently(os);
}
}
private static String append(Map.Entry e) {
return new StringBuilder(e.getKey()).append('=').append(e.getValue()).append('\n').toString();
}
@Override
public Map load() {
Scanner scan = null;
try {
scan = new Scanner(new File(TMP, storeName), UTF_8.name());
scan.useDelimiter("[=\n]");
String key;
String value;
while (scan.hasNext()) {
key = scan.next().trim();
value = scan.next().trim();
properties.put(key, Long.valueOf(value));
}
log.debug("Loading previous download state {}", properties.toString());
} catch (FileNotFoundException ex) {
log.debug("Missing {}", storeName);
} catch (Throwable ex) {
// Survive any exceptions
log.warn(ex.getMessage(), ex);
} finally {
if (scan != null)
scan.close();
}
return properties;
}
}