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260 lines
11 KiB
260 lines
11 KiB
// plasmaNURL.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 09.08.2004
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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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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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// NURL - noticed (known but not loaded) URL's
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package de.anomic.plasma;
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import java.io.File;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.Iterator;
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import de.anomic.server.logging.serverLog;
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public class plasmaCrawlNURL {
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public static final int STACK_TYPE_NULL = 0; // do not stack
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public static final int STACK_TYPE_CORE = 1; // put on local stack
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public static final int STACK_TYPE_LIMIT = 2; // put on global stack
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public static final int STACK_TYPE_OVERHANG = 3; // put on overhang stack; links that are known but not crawled
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public static final int STACK_TYPE_REMOTE = 4; // put on remote-triggered stack
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public static final int STACK_TYPE_IMAGE = 11; // put on image stack
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public static final int STACK_TYPE_MOVIE = 12; // put on movie stack
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public static final int STACK_TYPE_MUSIC = 13; // put on music stack
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private static final long minimumLocalDelta = 50; // the minimum time difference between access of the same local domain
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private static final long minimumGlobalDelta = 500; // the minimum time difference between access of the same global domain
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private static final long maximumDomAge = 60000; // the maximum age of a domain until it is used for another crawl attempt
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private plasmaCrawlBalancer coreStack; // links found by crawling to depth-1
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private plasmaCrawlBalancer limitStack; // links found by crawling at target depth
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private plasmaCrawlBalancer remoteStack; // links from remote crawl orders
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//private final plasmaCrawlBalancer overhangStack; // links found by crawling at depth+1
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//private kelondroStack imageStack; // links pointing to image resources
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//private kelondroStack movieStack; // links pointing to movie resources
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//private kelondroStack musicStack; // links pointing to music resources
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public plasmaCrawlNURL(File cachePath) {
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super();
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coreStack = new plasmaCrawlBalancer(cachePath, "urlNoticeCoreStack", false);
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limitStack = new plasmaCrawlBalancer(cachePath, "urlNoticeLimitStack", false);
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//overhangStack = new plasmaCrawlBalancer(overhangStackFile);
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remoteStack = new plasmaCrawlBalancer(cachePath, "urlNoticeRemoteStack", false);
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}
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public void close() {
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if (coreStack != null) {
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coreStack.close();
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coreStack = null;
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}
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if (limitStack != null) {
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limitStack.close();
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limitStack = null;
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}
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//overhangStack.close();
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if (remoteStack != null) {
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remoteStack.close();
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remoteStack = null;
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}
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}
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public void finalize() {
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if ((coreStack != null) || (limitStack != null) || (remoteStack != null)) {
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serverLog.logWarning("plasmaCrawlNURL", "NURL stack closed by finalizer");
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close();
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}
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}
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public boolean notEmpty() {
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return coreStack.notEmpty() || limitStack.notEmpty() || remoteStack.notEmpty();
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}
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public int size() {
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// this does not count the overhang stack size
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return coreStack.size() + limitStack.size() + remoteStack.size();
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}
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public int stackSize(int stackType) {
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switch (stackType) {
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case STACK_TYPE_CORE: return coreStack.size();
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case STACK_TYPE_LIMIT: return limitStack.size();
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case STACK_TYPE_OVERHANG: return 0;
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case STACK_TYPE_REMOTE: return remoteStack.size();
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default: return -1;
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}
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}
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public boolean existsInStack(String urlhash) {
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return
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coreStack.has(urlhash) ||
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limitStack.has(urlhash) ||
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//overhangStack.has(urlhash) ||
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remoteStack.has(urlhash);
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}
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public void push(int stackType, plasmaCrawlEntry entry) {
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try {
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switch (stackType) {
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case STACK_TYPE_CORE:
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coreStack.push(entry);
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break;
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case STACK_TYPE_LIMIT:
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limitStack.push(entry);
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break;
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case STACK_TYPE_REMOTE:
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remoteStack.push(entry);
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break;
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default: break;
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}
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} catch (IOException er) {}
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}
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public plasmaCrawlEntry get(String urlhash) {
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plasmaCrawlEntry entry = null;
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try {if ((entry = coreStack.get(urlhash)) != null) return entry;} catch (IOException e) {}
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try {if ((entry = limitStack.get(urlhash)) != null) return entry;} catch (IOException e) {}
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try {if ((entry = remoteStack.get(urlhash)) != null) return entry;} catch (IOException e) {}
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return null;
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}
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public plasmaCrawlEntry removeByURLHash(String urlhash) {
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plasmaCrawlEntry entry = null;
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try {if ((entry = coreStack.remove(urlhash)) != null) return entry;} catch (IOException e) {}
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try {if ((entry = limitStack.remove(urlhash)) != null) return entry;} catch (IOException e) {}
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try {if ((entry = remoteStack.remove(urlhash)) != null) return entry;} catch (IOException e) {}
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return null;
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}
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public int removeByProfileHandle(String handle) {
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int removed = 0;
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try {removed += coreStack.removeAllByProfileHandle(handle);} catch (IOException e) {}
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try {removed += limitStack.removeAllByProfileHandle(handle);} catch (IOException e) {}
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try {removed += remoteStack.removeAllByProfileHandle(handle);} catch (IOException e) {}
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return removed;
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}
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public plasmaCrawlEntry[] top(int stackType, int count) {
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switch (stackType) {
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case STACK_TYPE_CORE: return top(coreStack, count);
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case STACK_TYPE_LIMIT: return top(limitStack, count);
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case STACK_TYPE_REMOTE: return top(remoteStack, count);
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default: return null;
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}
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}
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public plasmaCrawlEntry pop(int stackType, boolean delay) throws IOException {
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switch (stackType) {
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case STACK_TYPE_CORE: return pop(coreStack, delay);
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case STACK_TYPE_LIMIT: return pop(limitStack, delay);
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case STACK_TYPE_REMOTE: return pop(remoteStack, delay);
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default: return null;
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}
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}
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public void shift(int fromStack, int toStack) {
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try {
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plasmaCrawlEntry entry = pop(fromStack, false);
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if (entry != null) push(toStack, entry);
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} catch (IOException e) {
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return;
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}
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}
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public void clear(int stackType) {
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switch (stackType) {
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case STACK_TYPE_CORE: coreStack.clear(); break;
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case STACK_TYPE_LIMIT: limitStack.clear(); break;
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case STACK_TYPE_REMOTE: remoteStack.clear(); break;
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default: return;
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}
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}
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private plasmaCrawlEntry pop(plasmaCrawlBalancer balancer, boolean delay) throws IOException {
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// this is a filo - pop
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int s;
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plasmaCrawlEntry entry;
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synchronized (balancer) {
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while ((s = balancer.size()) > 0) {
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entry = balancer.pop((delay) ? minimumLocalDelta : 0, (delay) ? minimumGlobalDelta : 0, maximumDomAge);
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if (entry == null) {
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if (s > balancer.size()) continue;
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int aftersize = balancer.size();
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balancer.clear(); // the balancer is broken and cannot shrink
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throw new IOException("entry is null, balancer cannot shrink (bevore pop = " + s + ", after pop = " + aftersize + "); reset of balancer");
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}
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return entry;
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}
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}
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throw new IOException("balancer stack is empty");
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}
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private plasmaCrawlEntry[] top(plasmaCrawlBalancer balancer, int count) {
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// this is a filo - top
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if (count > balancer.size()) count = balancer.size();
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ArrayList<plasmaCrawlEntry> list = new ArrayList<plasmaCrawlEntry>(count);
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for (int i = 0; i < count; i++) {
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try {
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plasmaCrawlEntry entry = balancer.top(i);
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if (entry == null) break;
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list.add(entry);
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} catch (IOException e) {
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break;
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}
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}
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return (plasmaCrawlEntry[]) list.toArray(new plasmaCrawlEntry[list.size()]);
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}
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public Iterator<plasmaCrawlEntry> iterator(int stackType) {
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// returns an iterator of plasmaCrawlBalancerEntry Objects
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try {switch (stackType) {
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case STACK_TYPE_CORE: return coreStack.iterator();
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case STACK_TYPE_LIMIT: return limitStack.iterator();
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case STACK_TYPE_REMOTE: return remoteStack.iterator();
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default: return null;
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}} catch (IOException e) {
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return new HashSet<plasmaCrawlEntry>().iterator();
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}
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}
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}
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