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327 lines
14 KiB
327 lines
14 KiB
// NoticedURL.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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// NURL - noticed (known but not loaded) URL's
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package net.yacy.crawler.data;
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import java.io.File;
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import java.io.IOException;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import net.yacy.cora.order.Base64Order;
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import net.yacy.cora.storage.HandleSet;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.cora.util.SpaceExceededException;
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import net.yacy.crawler.Balancer;
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import net.yacy.crawler.CrawlSwitchboard;
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import net.yacy.crawler.HostBalancer;
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import net.yacy.crawler.retrieval.Request;
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import net.yacy.crawler.robots.RobotsTxt;
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import net.yacy.kelondro.data.word.Word;
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import net.yacy.kelondro.index.RowHandleSet;
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public class NoticedURL {
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public enum StackType {
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LOCAL, GLOBAL, REMOTE, NOLOAD;
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}
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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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private Balancer noloadStack; // links that are not passed to a loader; the index will be generated from the Request entry
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protected NoticedURL(
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final File cachePath,
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final int onDemandLimit,
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final boolean exceed134217727) {
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ConcurrentLog.info("NoticedURL", "CREATING STACKS at " + cachePath.toString());
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this.coreStack = new HostBalancer(new File(cachePath, "CrawlerCoreStacks"), onDemandLimit, exceed134217727);
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this.limitStack = new HostBalancer(new File(cachePath, "CrawlerLimitStacks"), onDemandLimit, exceed134217727);
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this.remoteStack = new HostBalancer(new File(cachePath, "CrawlerRemoteStacks"), onDemandLimit, exceed134217727);
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this.noloadStack = new HostBalancer(new File(cachePath, "CrawlerNoLoadStacks"), onDemandLimit, exceed134217727);
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}
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public void clear() {
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ConcurrentLog.info("NoticedURL", "CLEARING ALL STACKS");
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if (this.coreStack != null) this.coreStack.clear();
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if (this.limitStack != null) this.limitStack.clear();
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if (this.remoteStack != null) this.remoteStack.clear();
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if (this.noloadStack != null) this.noloadStack.clear();
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}
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protected void close() {
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ConcurrentLog.info("NoticedURL", "CLOSING ALL STACKS");
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if (this.coreStack != null) {
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this.coreStack.close();
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this.coreStack = null;
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}
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if (this.limitStack != null) {
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this.limitStack.close();
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this.limitStack = null;
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}
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//overhangStack.close();
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if (this.remoteStack != null) {
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this.remoteStack.close();
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this.remoteStack = null;
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}
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if (this.noloadStack != null) {
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this.noloadStack.close();
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this.noloadStack = null;
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}
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}
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@Override
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protected void finalize() throws Throwable {
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if ((this.coreStack != null) || (this.limitStack != null) || (this.remoteStack != null)) {
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ConcurrentLog.warn("plasmaCrawlNURL", "NURL stack closed by finalizer");
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close();
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}
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super.finalize();
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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 ((this.coreStack == null) ? 0 : this.coreStack.size()) + ((this.limitStack == null) ? 0 : this.limitStack.size()) + ((this.remoteStack == null) ? 0 : this.remoteStack.size());
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}
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public boolean isEmptyLocal() {
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if (this.coreStack == null) return true;
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if (!this.coreStack.isEmpty()) return false;
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if (!this.limitStack.isEmpty()) return false;
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if (!this.noloadStack.isEmpty()) return false;
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return true;
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}
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public boolean isEmpty() {
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if (!isEmptyLocal()) return false;
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if (!this.remoteStack.isEmpty()) return false;
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return true;
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}
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public boolean isEmpty(final StackType stackType) {
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switch (stackType) {
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case NOLOAD: return (this.noloadStack == null) ? true : this.noloadStack.isEmpty();
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case LOCAL: return (this.coreStack == null) ? true : this.coreStack.isEmpty();
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case GLOBAL: return (this.limitStack == null) ? true : this.limitStack.isEmpty();
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case REMOTE: return (this.remoteStack == null) ? true : this.remoteStack.isEmpty();
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default: return true;
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}
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}
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public int stackSize(final StackType stackType) {
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switch (stackType) {
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case NOLOAD: return (this.noloadStack == null) ? 0 : this.noloadStack.size();
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case LOCAL: return (this.coreStack == null) ? 0 : this.coreStack.size();
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case GLOBAL: return (this.limitStack == null) ? 0 : this.limitStack.size();
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case REMOTE: return (this.remoteStack == null) ? 0 : this.remoteStack.size();
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default: return -1;
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}
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}
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protected boolean existsInStack(final byte[] urlhashb) {
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return
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this.coreStack.has(urlhashb) ||
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this.limitStack.has(urlhashb) ||
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//overhangStack.has(urlhashb) ||
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this.remoteStack.has(urlhashb) ||
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this.noloadStack.has(urlhashb);
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}
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/**
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* push a crawl request on one of the different crawl stacks
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* @param stackType
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* @param entry
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* @return null if this was successful or a String explaining what went wrong in case of an error
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*/
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public String push(final StackType stackType, final Request entry, CrawlProfile profile, final RobotsTxt robots) {
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try {
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switch (stackType) {
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case LOCAL: return this.coreStack.push(entry, profile, robots);
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case GLOBAL: return this.limitStack.push(entry, profile, robots);
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case REMOTE: return this.remoteStack.push(entry, profile, robots);
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case NOLOAD: return this.noloadStack.push(entry, profile, robots);
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default: return "stack type unknown";
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}
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} catch (final Exception er) {
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ConcurrentLog.logException(er);
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return "error pushing onto the crawl stack: " + er.getMessage();
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}
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}
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protected Request get(final byte[] urlhash) {
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Request entry = null;
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try {if ((entry = this.noloadStack.get(urlhash)) != null) return entry;} catch (final IOException e) {}
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try {if ((entry = this.coreStack.get(urlhash)) != null) return entry;} catch (final IOException e) {}
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try {if ((entry = this.limitStack.get(urlhash)) != null) return entry;} catch (final IOException e) {}
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try {if ((entry = this.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 byte[] urlhashBytes) {
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try {
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final HandleSet urlHashes = new RowHandleSet(Word.commonHashLength, Base64Order.enhancedCoder, 1);
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urlHashes.put(urlhashBytes);
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boolean ret = false;
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try {ret |= this.noloadStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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try {ret |= this.coreStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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try {ret |= this.limitStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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try {ret |= this.remoteStack.remove(urlHashes) > 0;} catch (final IOException e) {}
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return ret;
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} catch (final SpaceExceededException e) {
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ConcurrentLog.logException(e);
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return false;
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}
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}
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public int removeByProfileHandle(final String handle, final long timeout) throws SpaceExceededException {
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int removed = 0;
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try {removed += this.noloadStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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try {removed += this.coreStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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try {removed += this.limitStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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try {removed += this.remoteStack.removeAllByProfileHandle(handle, timeout);} catch (final IOException e) {}
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return removed;
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}
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public int removeByHostHash(final Set<String> hosthashes) {
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int removed = 0;
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removed += this.noloadStack.removeAllByHostHashes(hosthashes);
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removed += this.coreStack.removeAllByHostHashes(hosthashes);
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removed += this.limitStack.removeAllByHostHashes(hosthashes);
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removed += this.remoteStack.removeAllByHostHashes(hosthashes);
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return removed;
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}
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/**
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* get a list of domains that are currently maintained as domain stacks
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* @return a map of clear text strings of host names to two integers: the size of the domain stacks and the access delta time
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*/
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public Map<String, Integer[]> getDomainStackHosts(final StackType stackType, RobotsTxt robots) {
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switch (stackType) {
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case LOCAL: return this.coreStack.getDomainStackHosts(robots);
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case GLOBAL: return this.limitStack.getDomainStackHosts(robots);
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case REMOTE: return this.remoteStack.getDomainStackHosts(robots);
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case NOLOAD: return this.noloadStack.getDomainStackHosts(robots);
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default: return null;
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}
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}
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/**
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* get lists of crawl request entries for a specific host
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* @param host
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* @param maxcount
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* @return a list of crawl loader requests
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*/
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public List<Request> getDomainStackReferences(final StackType stackType, String host, int maxcount, final long maxtime) {
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switch (stackType) {
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case LOCAL: return this.coreStack.getDomainStackReferences(host, maxcount, maxtime);
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case GLOBAL: return this.limitStack.getDomainStackReferences(host, maxcount, maxtime);
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case REMOTE: return this.remoteStack.getDomainStackReferences(host, maxcount, maxtime);
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case NOLOAD: return this.noloadStack.getDomainStackReferences(host, maxcount, maxtime);
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default: return null;
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}
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}
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public Request pop(final StackType stackType, final boolean delay, final CrawlSwitchboard cs, final RobotsTxt robots) throws IOException {
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switch (stackType) {
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case LOCAL: return pop(this.coreStack, delay, cs, robots);
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case GLOBAL: return pop(this.limitStack, delay, cs, robots);
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case REMOTE: return pop(this.remoteStack, delay, cs, robots);
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case NOLOAD: return pop(this.noloadStack, false, cs, robots);
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default: return null;
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}
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}
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protected void shift(final StackType fromStack, final StackType toStack, final CrawlSwitchboard cs, final RobotsTxt robots) {
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try {
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final Request entry = pop(fromStack, false, cs, robots);
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if (entry != null) {
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final String warning = push(toStack, entry, null, robots);
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if (warning != null) {
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ConcurrentLog.warn("NoticedURL", "shift from " + fromStack + " to " + toStack + ": " + warning);
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}
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}
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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 StackType stackType) {
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ConcurrentLog.info("NoticedURL", "CLEARING STACK " + stackType);
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switch (stackType) {
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case LOCAL: this.coreStack.clear(); break;
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case GLOBAL: this.limitStack.clear(); break;
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case REMOTE: this.remoteStack.clear(); break;
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case NOLOAD: this.noloadStack.clear(); break;
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default: return;
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}
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}
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private static Request pop(final Balancer balancer, final boolean delay, final CrawlSwitchboard cs, final RobotsTxt robots) throws IOException {
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// this is a filo - pop
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int s;
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Request entry;
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int errors = 0;
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while ((s = balancer.size()) > 0) {
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entry = balancer.pop(delay, cs, robots);
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if (entry == null) {
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if (s > balancer.size()) continue;
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errors++;
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if (errors < 100) 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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ConcurrentLog.warn("BALANCER", "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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return null;
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}
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public Iterator<Request> iterator(final StackType stackType) {
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// returns an iterator of plasmaCrawlBalancerEntry Objects
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try {switch (stackType) {
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case LOCAL: return this.coreStack.iterator();
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case GLOBAL: return this.limitStack.iterator();
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case REMOTE: return this.remoteStack.iterator();
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case NOLOAD: return this.noloadStack.iterator();
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default: return null;
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}} catch (final IOException e) {
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return new HashSet<Request>().iterator();
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}
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}
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}
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