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298 lines
10 KiB
298 lines
10 KiB
// plasmaHTCache.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// This program 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 2 of the License, or
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// (at your option) any later version.
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//
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// This program 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 this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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/*
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Class documentation:
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This class has two purposes:
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1. provide a object that carries path and header information
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that shall be used as objects within a scheduler's stack
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2. static methods for a cache control and cache aging
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the class shall also be used to do a cache-cleaning and index creation
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*/
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package de.anomic.plasma;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.Map;
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import de.anomic.http.httpResponseHeader;
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import de.anomic.kelondro.blob.BLOB;
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import de.anomic.kelondro.blob.BLOBArray;
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import de.anomic.kelondro.blob.BLOBCompressor;
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import de.anomic.kelondro.blob.BLOBHeap;
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import de.anomic.kelondro.blob.MapView;
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import de.anomic.kelondro.order.Base64Order;
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import de.anomic.kelondro.text.Document;
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import de.anomic.kelondro.util.Log;
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import de.anomic.kelondro.util.FileUtils;
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import de.anomic.yacy.yacySeedDB;
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import de.anomic.yacy.yacyURL;
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public final class plasmaHTCache {
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public static final String RESPONSE_HEADER_DB_NAME = "responseHeader.heap";
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public static final String FILE_DB_NAME = "file.array";
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public static final long oneday = 1000L * 60L * 60L * 24L; // milliseconds of a day
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private static MapView responseHeaderDB = null;
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private static BLOBCompressor fileDB = null;
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private static BLOBArray fileDBunbuffered = null;
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public static long maxCacheSize = 0l;
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public static File cachePath = null;
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public static String salt;
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public static final Log log = new Log("HTCACHE");
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// URL attributes
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public static final int UA_LOCAL = 0; // URL was crawled locally
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public static final int UA_TILDE = 1; // tilde appears in URL
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public static final int UA_REDIRECT = 2; // The URL is a redirection
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// local flag attributes
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public static final char LT_LOCAL = 'L';
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public static final char LT_GLOBAL = 'G';
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public static void init(final File htCachePath, String peerSalt, final long CacheSizeMax) {
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cachePath = htCachePath;
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maxCacheSize = CacheSizeMax;
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salt = peerSalt;
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// reset old HTCache ?
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String[] list = cachePath.list();
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if (list != null) {
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File object;
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for (int i = list.length - 1; i >= 0; i--) {
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object = new File(cachePath, list[i]);
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if (object.getName().equals("http") ||
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object.getName().equals("yacy") ||
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object.getName().equals("https") ||
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object.getName().equals("ftp")) {
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FileUtils.deleteDirectory(cachePath);
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}
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}
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}
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// set/make cache path
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if (!htCachePath.exists()) {
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htCachePath.mkdirs();
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}
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if (!htCachePath.isDirectory()) {
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// if the cache does not exists or is a file and not a directory, panic
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log.logSevere("the cache path " + htCachePath.toString() + " is not a directory or does not exists and cannot be created");
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System.exit(0);
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}
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// open the response header database
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openDB();
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}
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static void resetDB() {
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log.logFine("reset responseHeader DB with "+ responseHeaderDB.size() +" entries");
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if (responseHeaderDB != null) responseHeaderDB.close();
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final File dbfile = new File(cachePath, RESPONSE_HEADER_DB_NAME);
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if (dbfile.exists()) dbfile.delete();
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openDB();
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}
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private static void openDB() {
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// open the response header database
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final File dbfile = new File(cachePath, RESPONSE_HEADER_DB_NAME);
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BLOB blob = null;
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try {
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blob = new BLOBHeap(dbfile, yacySeedDB.commonHashLength, Base64Order.enhancedCoder, 1024 * 1024);
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} catch (final IOException e) {
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e.printStackTrace();
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}
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responseHeaderDB = new MapView(blob, 500);
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try {
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fileDBunbuffered = new BLOBArray(new File(cachePath, FILE_DB_NAME), salt, 12, Base64Order.enhancedCoder, 1024 * 1024 * 2);
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fileDBunbuffered.setMaxSize(maxCacheSize);
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fileDB = new BLOBCompressor(fileDBunbuffered, 2 * 1024 * 1024);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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public static int responseHeaderDBSize() {
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return responseHeaderDB.size();
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}
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public static long fileDBSize() {
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return fileDB.length();
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}
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/**
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* This method changes the HTCache size.<br>
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* @param the new cache size in bytes
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*/
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public static void setCacheSize(final long newCacheSize) {
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maxCacheSize = newCacheSize;
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fileDBunbuffered.setMaxSize(maxCacheSize);
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}
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/**
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* This method returns the free HTCache size.<br>
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* @return the cache size in bytes
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*/
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public static long getFreeSize() {
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long l = fileDB.length();
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return (l >= maxCacheSize) ? 0 : maxCacheSize - l;
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}
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public static void close() {
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responseHeaderDB.close();
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fileDB.close();
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}
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public static boolean isPicture(final String mimeType) {
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if (mimeType == null) return false;
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return mimeType.toUpperCase().startsWith("IMAGE");
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}
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public static boolean isText(final String mimeType) {
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return plasmaParser.supportedMimeTypesContains(mimeType);
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}
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public static boolean noIndexingURL(final yacyURL url) {
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if (url == null) return false;
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String urlString = url.toString().toLowerCase();
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//http://www.yacy.net/getimage.php?image.png
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int idx = urlString.indexOf("?");
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if (idx > 0) urlString = urlString.substring(0,idx);
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//http://www.yacy.net/getimage.php
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idx = urlString.lastIndexOf(".");
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if (idx > 0) urlString = urlString.substring(idx+1);
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//php
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return plasmaParser.mediaExtContains(urlString);
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}
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// Store to Cache
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public static void storeMetadata(
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final httpResponseHeader responseHeader,
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Document metadata
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) {
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if (responseHeader != null) try {
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// store the response header into the header database
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final HashMap<String, String> hm = new HashMap<String, String>();
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hm.putAll(responseHeader);
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hm.put("@@URL", metadata.url().toNormalform(false, false));
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hm.put("@@DEPTH", Integer.toString(metadata.depth()));
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responseHeaderDB.put(metadata.urlHash(), hm);
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} catch (final Exception e) {
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log.logWarning("could not write ResourceInfo: "
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+ e.getClass() + ": " + e.getMessage());
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resetDB();
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}
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}
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public static void storeFile(yacyURL url, byte[] file) {
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try {
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fileDB.put(url.hash().getBytes("UTF-8"), file);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* Returns an object containing metadata about a cached resource
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* @param url the {@link URL} of the resource
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* @return an {@link IResourceInfo info object}
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* @throws <b>IllegalAccessException</b> if the {@link SecurityManager} doesn't allow instantiation
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* of the info object with the given protocol
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* @throws <b>UnsupportedProtocolException</b> if the protocol is not supported and therefore the
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* info object couldn't be created
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*/
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public static httpResponseHeader loadResponseHeader(final yacyURL url) throws IllegalAccessException {
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// loading data from database
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Map<String, String> hdb;
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try {
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hdb = responseHeaderDB.get(url.hash());
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} catch (final IOException e) {
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return null;
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}
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if (hdb == null) return null;
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return new httpResponseHeader(null, hdb);
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}
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/**
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* Returns the content of a cached resource as {@link InputStream}
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* @param url the requested resource
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* @return the resource content as {@link InputStream}. In no data
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* is available or the cached file is not readable, <code>null</code>
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* is returned.
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*/
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public static InputStream getResourceContentStream(final yacyURL url) {
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// load the url as resource from the cache
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byte[] b = getResourceContent(url);
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if (b == null) return null;
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return new ByteArrayInputStream(b);
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}
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public static byte[] getResourceContent(final yacyURL url) {
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// load the url as resource from the cache
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try {
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return fileDB.get(url.hash().getBytes("UTF-8"));
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} catch (IOException e) {
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e.printStackTrace();
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return null;
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}
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}
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public static long getResourceContentLength(final yacyURL url) {
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// load the url as resource from the cache
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try {
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return fileDB.length(url.hash().getBytes("UTF-8"));
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} catch (IOException e) {
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e.printStackTrace();
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return -1;
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}
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}
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public static void deleteFromCache(yacyURL url) throws IOException {
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responseHeaderDB.remove(url.hash());
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fileDB.remove(url.hash().getBytes("UTF-8"));
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}
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}
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