mirror of
https://github.com/yacy/yacy_search_server.git
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ce1adf9955
high-performance search query situations as seen in yacy-metager integration showed deadlock situation caused by synchronization effects inside of sun.java code. It appears that the logger is not completely safe against deadlock situations in concurrent calls of the logger. One possible solution would be a outside-synchronization with 'synchronized' statements, but that would further apply blocking on all high-efficient methods that call the logger. It is much better to do a non-blocking hand-over of logging lines and work off log entries with a concurrent log writer. This also disconnects IO operations from logging, which can also cause IO operation when a log is written to a file. This commit not only moves the logger from kelondro to yacy.logging, it also inserts the concurrency methods to realize non-blocking logging. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6078 6c8d7289-2bf4-0310-a012-ef5d649a1542
182 lines
7.2 KiB
Java
182 lines
7.2 KiB
Java
// ViewImage.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, 2006
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// created 03.04.2006
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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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import java.awt.Container;
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import java.awt.Image;
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import java.awt.MediaTracker;
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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.net.MalformedURLException;
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import java.util.HashMap;
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import de.anomic.http.httpRequestHeader;
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import de.anomic.kelondro.util.FileUtils;
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import de.anomic.plasma.plasmaSnippetCache;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.server.serverObjects;
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import de.anomic.server.serverSwitch;
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import de.anomic.yacy.yacyURL;
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import de.anomic.yacy.logging.Log;
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import de.anomic.ymage.ymageImageParser;
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public class ViewImage {
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private static HashMap<String, Image> iconcache = new HashMap<String, Image>();
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private static String defaulticon = "htroot/env/grafics/dfltfvcn.ico";
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private static byte[] defaulticonb;
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static {
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try {
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defaulticonb = FileUtils.read(new File(defaulticon));
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} catch (final IOException e) {
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}
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}
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public static Image respond(final httpRequestHeader header, final serverObjects post, final serverSwitch<?> env) {
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final plasmaSwitchboard sb = (plasmaSwitchboard)env;
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// the url to the image can be either submitted with an url in clear text, or using a license key
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// if the url is given as clear text, the user must be authorized as admin
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// the license can be used also from non-authorized users
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String urlString = post.get("url", "");
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final String urlLicense = post.get("code", "");
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final boolean auth = ((String) header.get(httpRequestHeader.CONNECTION_PROP_CLIENTIP, "")).equals("localhost") || sb.verifyAuthentication(header, true); // handle access rights
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yacyURL url = null;
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if ((urlString.length() > 0) && (auth)) try {
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url = new yacyURL(urlString, null);
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} catch (final MalformedURLException e1) {
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url = null;
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}
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if ((url == null) && (urlLicense.length() > 0)) {
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url = sb.licensedURLs.releaseLicense(urlLicense);
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urlString = (url == null) ? null : url.toNormalform(true, true);
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}
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int width = post.getInt("width", 0);
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int height = post.getInt("height", 0);
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int maxwidth = post.getInt("maxwidth", 0);
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int maxheight = post.getInt("maxheight", 0);
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final int timeout = post.getInt("timeout", 5000);
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// getting the image as stream
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Image scaled = iconcache.get(urlString);
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if (scaled == null) {
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Object[] resource = null;
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if (url != null) try {
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resource = plasmaSnippetCache.getResource(url, true, timeout, false, true);
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} catch (IOException e) {
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Log.logWarning("ViewImage", "cannot load: " + e.getMessage());
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}
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byte[] imgb = null;
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if (resource == null) {
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if (urlString.endsWith(".ico")) {
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// load default favicon dfltfvcn.ico
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if (defaulticonb == null) try {
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imgb = FileUtils.read(new File(sb.getRootPath(), defaulticon));
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} catch (final IOException e) {
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return null;
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} else {
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imgb = defaulticonb;
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}
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} else {
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return null;
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}
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} else {
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final InputStream imgStream = (InputStream) resource[0];
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if (imgStream == null) return null;
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// read image data
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try {
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imgb = FileUtils.read(imgStream);
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} catch (final IOException e) {
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return null;
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} finally {
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try {
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imgStream.close();
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} catch (final Exception e) {/* ignore this */}
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}
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}
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// read image
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final Image image = ymageImageParser.parse(urlString, imgb);
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if (image == null || (auth && (width == 0 || height == 0) && maxwidth == 0 && maxheight == 0)) return image;
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// find original size
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final int h = image.getHeight(null);
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final int w = image.getWidth(null);
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// in case of not-authorized access shrink the image to prevent
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// copyright problems, so that images are not larger than thumbnails
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if (auth) {
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maxwidth = (maxwidth == 0) ? w : maxwidth;
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maxheight = (maxheight == 0) ? h : maxheight;
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} else if ((w > 16) || (h > 16)) {
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maxwidth = (int) Math.min(64.0, w * 0.6);
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maxheight = (int) Math.min(64.0, h * 0.6);
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} else {
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maxwidth = 16;
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maxheight = 16;
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}
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// calculate width & height from maxwidth & maxheight
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if ((maxwidth < w) || (maxheight < h)) {
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// scale image
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final double hs = (w <= maxwidth) ? 1.0 : ((double) maxwidth) / ((double) w);
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final double vs = (h <= maxheight) ? 1.0 : ((double) maxheight) / ((double) h);
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double scale = Math.min(hs, vs);
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if (!auth) scale = Math.min(scale, 0.6); // this is for copyright purpose
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if (scale < 1.0) {
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width = Math.max(1, (int) (w * scale));
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height = Math.max(1, (int) (h * scale));
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} else {
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width = Math.max(1, w);
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height = Math.max(1, h);
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}
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// compute scaled image
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scaled = ((w == width) && (h == height)) ? image : image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING);
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final MediaTracker mediaTracker = new MediaTracker(new Container());
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mediaTracker.addImage(scaled, 0);
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try {mediaTracker.waitForID(0);} catch (final InterruptedException e) {}
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} else {
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// do not scale
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width = w;
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height = h;
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scaled = image;
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}
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if ((height == 16) && (width == 16) && (resource != null)) {
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// this might be a favicon, store image to cache for faster re-load later on
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iconcache.put(urlString, scaled);
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}
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}
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return scaled;
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}
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}
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