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142 lines
4.2 KiB
142 lines
4.2 KiB
/*
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* This file is part of Airsonic.
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*
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* Airsonic is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Airsonic is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Airsonic. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2014 (C) Sindre Mehus
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*/
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package org.airsonic.player.service;
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import de.umass.lastfm.cache.Cache;
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import de.umass.lastfm.cache.FileSystemCache;
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import org.airsonic.player.util.FileUtil;
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import org.apache.commons.io.IOUtils;
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import java.io.*;
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import java.util.Properties;
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/**
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* Based on {@link FileSystemCache}, but properly closes files and enforces
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* time-to-live (by ignoring HTTP header directives).
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*
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* @author Sindre Mehus
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* @version $Id$
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*/
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public class LastFmCache extends Cache {
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private final File cacheDir;
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private final long ttl;
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public LastFmCache(File cacheDir, final long ttl) {
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this.cacheDir = cacheDir;
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this.ttl = ttl;
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setExpirationPolicy((method, params) -> ttl);
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}
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@Override
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public boolean contains(String cacheEntryName) {
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return getXmlFile(cacheEntryName).exists();
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}
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@Override
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public InputStream load(String cacheEntryName) {
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try (FileInputStream in = new FileInputStream(getXmlFile(cacheEntryName))) {
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return new ByteArrayInputStream(IOUtils.toByteArray(in));
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} catch (Exception e) {
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return null;
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}
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}
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@Override
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public void remove(String cacheEntryName) {
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getXmlFile(cacheEntryName).delete();
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getMetaFile(cacheEntryName).delete();
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}
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@Override
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public void store(String cacheEntryName, InputStream inputStream, long expirationDate) {
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createCache();
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OutputStream xmlOut = null;
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OutputStream metaOut = null;
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try {
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File xmlFile = getXmlFile(cacheEntryName);
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xmlOut = new FileOutputStream(xmlFile);
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IOUtils.copy(inputStream, xmlOut);
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File metaFile = getMetaFile(cacheEntryName);
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Properties properties = new Properties();
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// Note: Ignore the given expirationDate, since Last.fm sets it to just one day ahead.
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properties.setProperty("expiration-date", Long.toString(getExpirationDate()));
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metaOut = new FileOutputStream(metaFile);
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properties.store(metaOut, null);
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} catch (Exception e) {
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// we ignore the exception. if something went wrong we just don't cache it.
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} finally {
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FileUtil.closeQuietly(xmlOut);
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FileUtil.closeQuietly(metaOut);
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}
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}
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private long getExpirationDate() {
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return System.currentTimeMillis() + ttl;
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}
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private void createCache() {
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if (!cacheDir.exists()) {
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cacheDir.mkdirs();
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}
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}
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@Override
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public boolean isExpired(String cacheEntryName) {
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File f = getMetaFile(cacheEntryName);
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if (!f.exists()) {
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return false;
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}
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InputStream in = null;
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try {
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Properties p = new Properties();
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in = new FileInputStream(f);
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p.load(in);
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long expirationDate = Long.valueOf(p.getProperty("expiration-date"));
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return expirationDate < System.currentTimeMillis();
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} catch (Exception e) {
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return false;
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} finally {
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FileUtil.closeQuietly(in);
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}
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}
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@Override
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public void clear() {
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for (File file : cacheDir.listFiles()) {
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if (file.isFile()) {
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file.delete();
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}
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}
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}
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private File getXmlFile(String cacheEntryName) {
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return new File(cacheDir, cacheEntryName + ".xml");
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}
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private File getMetaFile(String cacheEntryName) {
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return new File(cacheDir, cacheEntryName + ".meta");
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}
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}
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