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258 lines
10 KiB
258 lines
10 KiB
// plasmaNURL.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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// 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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// NURL - noticed (known but not loaded) URL's
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package de.anomic.crawler;
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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 NoticedURL {
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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 minimumLocalDeltaInit = 0; // the minimum time difference between access of the same local domain
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private static final long minimumGlobalDeltaInit = 500; // the minimum time difference between access of the same global domain
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private Balancer coreStack; // links found by crawling to depth-1
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private Balancer limitStack; // links found by crawling at target depth
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private Balancer remoteStack; // links from remote crawl orders
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public NoticedURL(final File cachePath) {
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this.coreStack = new Balancer(cachePath, "urlNoticeCoreStack", false, minimumLocalDeltaInit, minimumGlobalDeltaInit);
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this.limitStack = new Balancer(cachePath, "urlNoticeLimitStack", false, minimumLocalDeltaInit, minimumGlobalDeltaInit);
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//overhangStack = new plasmaCrawlBalancer(overhangStackFile);
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this.remoteStack = new Balancer(cachePath, "urlNoticeRemoteStack", false, minimumLocalDeltaInit, minimumGlobalDeltaInit);
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}
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public long getMinimumLocalDelta() {
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return this.coreStack.getMinimumLocalDelta();
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}
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public long getMinimumGlobalDelta() {
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return this.coreStack.getMinimumGlobalDelta();
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}
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public void setMinimumDelta(final long minimumLocalDelta, final long minimumGlobalDelta) {
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this.coreStack.setMinimumDelta(minimumLocalDelta, minimumGlobalDelta);
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this.limitStack.setMinimumDelta(minimumLocalDelta, minimumGlobalDelta);
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this.remoteStack.setMinimumDelta(minimumLocalDelta, minimumGlobalDelta);
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}
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public void clear() {
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coreStack.clear();
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limitStack.clear();
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remoteStack.clear();
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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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protected 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 == null) ? 0 : coreStack.size()) + ((limitStack == null) ? 0 : limitStack.size()) + ((remoteStack == null) ? 0 : remoteStack.size());
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}
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public int stackSize(final int stackType) {
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switch (stackType) {
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case STACK_TYPE_CORE: return (coreStack == null) ? 0 : coreStack.size();
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case STACK_TYPE_LIMIT: return (limitStack == null) ? 0 : limitStack.size();
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case STACK_TYPE_OVERHANG: return 0;
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case STACK_TYPE_REMOTE: return (remoteStack == null) ? 0 : remoteStack.size();
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default: return -1;
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}
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}
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public boolean existsInStack(final 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(final int stackType, final CrawlEntry 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 (final IOException er) {}
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}
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public CrawlEntry get(final String urlhash) {
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CrawlEntry entry = null;
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try {if ((entry = coreStack.get(urlhash)) != null) return entry;} catch (final IOException e) {}
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try {if ((entry = limitStack.get(urlhash)) != null) return entry;} catch (final IOException e) {}
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try {if ((entry = remoteStack.get(urlhash)) != null) return entry;} catch (final IOException e) {}
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return null;
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}
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/**
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* remove a CrawlEntry by a given hash. Usage of this method is not encouraged,
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* because the underlying data structure (crawl stacks) cannot handle removals very good.
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* @param urlhash
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* @return true, if the entry was removed; false if not
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*/
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public boolean removeByURLHash(final String urlhash) {
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final HashSet<String> urlHashes = new HashSet<String>();
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urlHashes.add(urlhash);
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try {return coreStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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try {return limitStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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try {return remoteStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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return false;
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}
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public int removeByProfileHandle(final String handle, final long timeout) {
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int removed = 0;
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try {removed += coreStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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try {removed += limitStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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try {removed += remoteStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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return removed;
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}
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public ArrayList<CrawlEntry> top(final int stackType, final 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 CrawlEntry pop(final int stackType, final boolean delay, CrawlProfile profile) throws IOException {
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switch (stackType) {
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case STACK_TYPE_CORE: return pop(coreStack, delay, profile);
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case STACK_TYPE_LIMIT: return pop(limitStack, delay, profile);
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case STACK_TYPE_REMOTE: return pop(remoteStack, delay, profile);
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default: return null;
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}
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}
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public void shift(final int fromStack, final int toStack, CrawlProfile profile) {
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try {
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final CrawlEntry entry = pop(fromStack, false, profile);
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if (entry != null) push(toStack, entry);
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} catch (final IOException e) {
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return;
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}
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}
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public void clear(final 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 CrawlEntry pop(final Balancer balancer, final boolean delay, CrawlProfile profile) throws IOException {
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// this is a filo - pop
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int s;
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CrawlEntry entry;
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synchronized (balancer) {
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while ((s = balancer.size()) > 0) {
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entry = balancer.pop(delay, profile);
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if (entry == null) {
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if (s > balancer.size()) continue;
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final 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 ArrayList<CrawlEntry> top(final Balancer 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<CrawlEntry> list;
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try {
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list = balancer.top(count);
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} catch (final IOException e) {
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list = new ArrayList<CrawlEntry>(0);
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}
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return list;
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}
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public Iterator<CrawlEntry> iterator(final 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 (final IOException e) {
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return new HashSet<CrawlEntry>().iterator();
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}
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}
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}
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