You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
641 lines
27 KiB
641 lines
27 KiB
// IndexingStack.java
|
|
// (C) 2005 by Michael Peter Christen; mc@yacy.net
|
|
// first published on http://yacy.net
|
|
// Frankfurt, Germany, 2005
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// LICENSE
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
|
|
package de.anomic.crawler;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.net.MalformedURLException;
|
|
import java.util.Collection;
|
|
import java.util.Date;
|
|
import java.util.Iterator;
|
|
import java.util.concurrent.ConcurrentHashMap;
|
|
|
|
import de.anomic.http.httpResponseHeader;
|
|
import de.anomic.kelondro.index.Row;
|
|
import de.anomic.kelondro.order.Base64Order;
|
|
import de.anomic.kelondro.order.NaturalOrder;
|
|
import de.anomic.kelondro.table.Stack;
|
|
import de.anomic.kelondro.text.metadataPrototype.URLMetadataRow;
|
|
import de.anomic.kelondro.util.DateFormatter;
|
|
import de.anomic.kelondro.util.Log;
|
|
import de.anomic.plasma.plasmaHTCache;
|
|
import de.anomic.plasma.plasmaSwitchboardConstants;
|
|
import de.anomic.plasma.plasmaWordIndex;
|
|
import de.anomic.yacy.yacySeed;
|
|
import de.anomic.yacy.yacySeedDB;
|
|
import de.anomic.yacy.yacyURL;
|
|
|
|
public class IndexingStack {
|
|
|
|
private final Stack sbQueueStack;
|
|
private final CrawlProfile profiles;
|
|
private final plasmaWordIndex wordIndex;
|
|
private final ConcurrentHashMap<String, QueueEntry> queueInProcess;
|
|
|
|
public IndexingStack(final plasmaWordIndex wordIndex, final File sbQueueStackPath, final CrawlProfile profiles) {
|
|
this.profiles = profiles;
|
|
this.wordIndex = wordIndex;
|
|
this.queueInProcess = new ConcurrentHashMap<String, QueueEntry>();
|
|
this.sbQueueStack = Stack.open(sbQueueStackPath, rowdef);
|
|
}
|
|
|
|
public static final Row rowdef = new Row(
|
|
"String url-256, " + // the url
|
|
"String refhash-" + yacySeedDB.commonHashLength + ", " + // the url's referrer hash
|
|
"Cardinal modifiedsince-11 {b64e}, " + // from ifModifiedSince
|
|
"byte[] flags-1, " + // flags
|
|
"String initiator-" + yacySeedDB.commonHashLength + ", " + // the crawling initiator
|
|
"Cardinal depth-2 {b64e}, " + // the prefetch depth so far, starts at 0
|
|
"String profile-" + yacySeedDB.commonHashLength + ", " + // the name of the prefetch profile handle
|
|
"String urldescr-80",
|
|
NaturalOrder.naturalOrder
|
|
);
|
|
|
|
public int size() {
|
|
return (sbQueueStack == null) ? 0 : sbQueueStack.size();
|
|
}
|
|
|
|
public synchronized void push(final QueueEntry entry) throws IOException {
|
|
if (entry == null) return;
|
|
if (sbQueueStack == null) return; // may occur during shutdown
|
|
sbQueueStack.push(sbQueueStack.row().newEntry(new byte[][]{
|
|
entry.url.toString().getBytes(),
|
|
(entry.referrerHash == null) ? "".getBytes() : entry.referrerHash.getBytes(),
|
|
Base64Order.enhancedCoder.encodeLong((entry.ifModifiedSince == null) ? 0 : entry.ifModifiedSince.getTime(), 11).getBytes(),
|
|
new byte[]{entry.flags},
|
|
(entry.initiator == null) ? "".getBytes() : entry.initiator.getBytes(),
|
|
Base64Order.enhancedCoder.encodeLong(entry.depth, rowdef.width(5)).getBytes(),
|
|
(entry.profileHandle == null) ? "".getBytes() : entry.profileHandle.getBytes(),
|
|
(entry.anchorName == null) ? "-".getBytes("UTF-8") : entry.anchorName.getBytes("UTF-8")
|
|
}));
|
|
}
|
|
|
|
public synchronized QueueEntry pop() throws IOException {
|
|
synchronized (sbQueueStack) {
|
|
int sizeBefore;
|
|
while ((sizeBefore = sbQueueStack.size()) > 0) {
|
|
Row.Entry b = sbQueueStack.pot();
|
|
if (b == null) {
|
|
Log.logInfo("IndexingStack", "sbQueueStack.pot() == null");
|
|
if (sbQueueStack.size() < sizeBefore) continue;
|
|
Log.logSevere("IndexingStack", "sbQueueStack does not shrink after pot() == null; trying pop()");
|
|
}
|
|
if (sbQueueStack.size() < sizeBefore) {
|
|
return new QueueEntry(b);
|
|
} else {
|
|
Log.logSevere("IndexingStack", "sbQueueStack does not shrink after pot() != null; trying pop()");
|
|
}
|
|
sizeBefore = sbQueueStack.size();
|
|
b = sbQueueStack.pop();
|
|
if (b == null) {
|
|
Log.logInfo("IndexingStack", "sbQueueStack.pop() == null");
|
|
if (sbQueueStack.size() < sizeBefore) continue;
|
|
Log.logSevere("IndexingStack", "sbQueueStack does not shrink after pop() == null; failed");
|
|
return null;
|
|
}
|
|
return new QueueEntry(b);
|
|
}
|
|
Log.logInfo("IndexingStack", "sbQueueStack.size() == 0");
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public synchronized QueueEntry remove(final String urlHash) {
|
|
final Iterator<Row.Entry> i = sbQueueStack.stackIterator(true);
|
|
Row.Entry rowentry;
|
|
QueueEntry entry;
|
|
while (i.hasNext()) {
|
|
rowentry = i.next();
|
|
entry = new QueueEntry(rowentry);
|
|
if (entry.urlHash().equals(urlHash)) {
|
|
i.remove();
|
|
return entry;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public void clear() {
|
|
sbQueueStack.clear();
|
|
}
|
|
|
|
public void close() {
|
|
if (sbQueueStack != null) {
|
|
sbQueueStack.close();
|
|
}
|
|
}
|
|
|
|
protected void finalize() throws Throwable {
|
|
try {
|
|
close();
|
|
} catch (final Exception e) {
|
|
throw new IOException("plasmaSwitchboardQueue.finalize()" + e.getMessage());
|
|
}
|
|
super.finalize();
|
|
}
|
|
|
|
public Iterator<QueueEntry> entryIterator(final boolean up) {
|
|
// iterates the elements in an ordered way.
|
|
// returns plasmaSwitchboardQueue.Entry - type Objects
|
|
return new entryIterator(up);
|
|
}
|
|
|
|
public class entryIterator implements Iterator<QueueEntry> {
|
|
|
|
Iterator<Row.Entry> rows;
|
|
|
|
public entryIterator(final boolean up) {
|
|
rows = sbQueueStack.stackIterator(up);
|
|
}
|
|
|
|
public boolean hasNext() {
|
|
return rows.hasNext();
|
|
}
|
|
|
|
public QueueEntry next() {
|
|
return new QueueEntry(rows.next());
|
|
}
|
|
|
|
public void remove() {
|
|
rows.remove();
|
|
}
|
|
}
|
|
|
|
public QueueEntry newEntry(final yacyURL url, final String referrer, final Date ifModifiedSince, final boolean requestWithCookie,
|
|
final String initiator, final int depth, final String profilehandle, final String anchorName) {
|
|
return new QueueEntry(url, referrer, ifModifiedSince, requestWithCookie, initiator, depth, profilehandle, anchorName);
|
|
}
|
|
|
|
public void enQueueToActive(final QueueEntry entry) {
|
|
queueInProcess.put(entry.urlHash(), entry);
|
|
}
|
|
|
|
public QueueEntry getActiveEntry(final String urlhash) {
|
|
// show one entry from the queue
|
|
return this.queueInProcess.get(urlhash);
|
|
}
|
|
|
|
public int getActiveQueueSize() {
|
|
return this.queueInProcess.size();
|
|
}
|
|
|
|
public Collection<QueueEntry> getActiveQueueEntries() {
|
|
// todo: check dead entries?
|
|
return this.queueInProcess.values();
|
|
}
|
|
|
|
public static final int QUEUE_STATE_FRESH = 0;
|
|
public static final int QUEUE_STATE_PARSING = 1;
|
|
public static final int QUEUE_STATE_CONDENSING = 2;
|
|
public static final int QUEUE_STATE_STRUCTUREANALYSIS = 3;
|
|
public static final int QUEUE_STATE_INDEXSTORAGE = 4;
|
|
public static final int QUEUE_STATE_FINISHED = 5;
|
|
|
|
public class QueueEntry {
|
|
yacyURL url; // plasmaURL.urlStringLength
|
|
String referrerHash; // plasmaURL.urlHashLength
|
|
Date ifModifiedSince; // 6
|
|
byte flags; // 1
|
|
String initiator; // yacySeedDB.commonHashLength
|
|
int depth; // plasmaURL.urlCrawlDepthLength
|
|
String profileHandle; // plasmaURL.urlCrawlProfileHandleLength
|
|
String anchorName; // plasmaURL.urlDescrLength
|
|
int status;
|
|
|
|
// computed values
|
|
private CrawlProfile.entry profileEntry;
|
|
private httpResponseHeader responseHeader;
|
|
private yacyURL referrerURL;
|
|
|
|
public QueueEntry(final yacyURL url, final String referrer, final Date ifModifiedSince, final boolean requestWithCookie,
|
|
final String initiator, final int depth, final String profileHandle, final String anchorName) {
|
|
this.url = url;
|
|
this.referrerHash = referrer;
|
|
this.ifModifiedSince = ifModifiedSince;
|
|
this.flags = (requestWithCookie) ? (byte) 1 : (byte) 0;
|
|
this.initiator = initiator;
|
|
this.depth = depth;
|
|
this.profileHandle = profileHandle;
|
|
this.anchorName = (anchorName==null)?"":anchorName.trim();
|
|
|
|
this.profileEntry = null;
|
|
this.responseHeader = null;
|
|
this.referrerURL = null;
|
|
this.status = QUEUE_STATE_FRESH;
|
|
}
|
|
|
|
public QueueEntry(final Row.Entry row) {
|
|
final long ims = row.getColLong(2);
|
|
final byte flags = row.getColByte(3);
|
|
try {
|
|
this.url = new yacyURL(row.getColString(0, "UTF-8"), null);
|
|
} catch (final MalformedURLException e) {
|
|
this.url = null;
|
|
}
|
|
this.referrerHash = row.getColString(1, "UTF-8");
|
|
this.ifModifiedSince = (ims == 0) ? null : new Date(ims);
|
|
this.flags = ((flags & 1) == 1) ? (byte) 1 : (byte) 0;
|
|
this.initiator = row.getColString(4, "UTF-8");
|
|
this.depth = (int) row.getColLong(5);
|
|
this.profileHandle = row.getColString(6, "UTF-8");
|
|
this.anchorName = row.getColString(7, "UTF-8");
|
|
|
|
this.profileEntry = null;
|
|
this.responseHeader = null;
|
|
this.referrerURL = null;
|
|
this.status = QUEUE_STATE_FRESH;
|
|
}
|
|
|
|
public QueueEntry(final byte[][] row) throws IOException {
|
|
final long ims = (row[2] == null) ? 0 : Base64Order.enhancedCoder.decodeLong(new String(row[2], "UTF-8"));
|
|
final byte flags = (row[3] == null) ? 0 : row[3][0];
|
|
try {
|
|
this.url = new yacyURL(new String(row[0], "UTF-8"), null);
|
|
} catch (final MalformedURLException e) {
|
|
this.url = null;
|
|
}
|
|
this.referrerHash = (row[1] == null) ? null : new String(row[1], "UTF-8");
|
|
this.ifModifiedSince = (ims == 0) ? null : new Date(ims);
|
|
this.flags = ((flags & 1) == 1) ? (byte) 1 : (byte) 0;
|
|
this.initiator = (row[4] == null) ? null : new String(row[4], "UTF-8");
|
|
this.depth = (int) Base64Order.enhancedCoder.decodeLong(new String(row[5], "UTF-8"));
|
|
this.profileHandle = new String(row[6], "UTF-8");
|
|
this.anchorName = (row[7] == null) ? null : (new String(row[7], "UTF-8")).trim();
|
|
|
|
this.profileEntry = null;
|
|
this.responseHeader = null;
|
|
this.referrerURL = null;
|
|
this.status = QUEUE_STATE_FRESH;
|
|
}
|
|
|
|
public void updateStatus(final int newStatus) {
|
|
this.status = newStatus;
|
|
}
|
|
|
|
public void close() {
|
|
queueInProcess.remove(this.url.hash());
|
|
}
|
|
|
|
protected void finalize() {
|
|
this.close();
|
|
}
|
|
|
|
public yacyURL url() {
|
|
return url;
|
|
}
|
|
|
|
public String urlHash() {
|
|
return url.hash();
|
|
}
|
|
|
|
public boolean requestedWithCookie() {
|
|
return (flags & 1) == 1;
|
|
}
|
|
|
|
public boolean proxy() {
|
|
// FIXME the equals seems to be incorrect: String.equals(boolean)
|
|
return (initiator == null) || (initiator.equals(initiator.length() == 0));
|
|
}
|
|
|
|
public String initiator() {
|
|
return (initiator == null) ? "------------" : initiator; // TODO: this may cause problems for methods that check if the initiator is the proxy
|
|
}
|
|
|
|
public yacySeed initiatorPeer() {
|
|
if ((initiator == null) || (initiator.length() == 0)) return null;
|
|
if (initiator.equals(wordIndex.peers().mySeed().hash)) {
|
|
// normal crawling
|
|
return null;
|
|
}
|
|
// this was done for remote peer (a global crawl)
|
|
return wordIndex.peers().getConnected(initiator);
|
|
}
|
|
|
|
public int depth() {
|
|
return depth;
|
|
}
|
|
|
|
public long size() {
|
|
return plasmaHTCache.getResourceContentLength(this.url);
|
|
}
|
|
|
|
public CrawlProfile.entry profile() {
|
|
if (profileEntry == null) profileEntry = profiles.getEntry(profileHandle);
|
|
return profileEntry;
|
|
}
|
|
|
|
private void getResponseHeader() {
|
|
if (this.responseHeader == null) try {
|
|
this.responseHeader = plasmaHTCache.loadResponseHeader(this.url);
|
|
} catch (final Exception e) {
|
|
Log.logSevere("PLASMA", "responseHeader: failed to get header", e);
|
|
}
|
|
}
|
|
|
|
public String getMimeType() {
|
|
this.getResponseHeader();
|
|
return (responseHeader == null) ? null : responseHeader.mime();
|
|
}
|
|
|
|
public String getCharacterEncoding() {
|
|
getResponseHeader();
|
|
return (responseHeader == null) ? null : responseHeader.getCharacterEncoding();
|
|
}
|
|
|
|
public Date getModificationDate() {
|
|
getResponseHeader();
|
|
return (responseHeader == null) ? new Date() : responseHeader.lastModified();
|
|
}
|
|
|
|
public yacyURL referrerURL() {
|
|
if (referrerURL == null) {
|
|
// FIXME the equals seems to be incorrect: String.equals(boolean)
|
|
if ((referrerHash == null) || ((initiator != null) && (referrerHash.equals(initiator.length() == 0)))) return null;
|
|
final URLMetadataRow entry = wordIndex.metadata().load(referrerHash, null, 0);
|
|
if (entry == null) referrerURL = null; else referrerURL = entry.metadata().url();
|
|
}
|
|
return referrerURL;
|
|
}
|
|
|
|
public String referrerHash() {
|
|
return (referrerHash == null) ? "" : referrerHash;
|
|
}
|
|
|
|
public String anchorName() {
|
|
return anchorName;
|
|
}
|
|
|
|
public int processCase() {
|
|
// we must distinguish the following cases: resource-load was initiated by
|
|
// 1) global crawling: the index is extern, not here (not possible here)
|
|
// 2) result of search queries, some indexes are here (not possible here)
|
|
// 3) result of index transfer, some of them are here (not possible here)
|
|
// 4) proxy-load (initiator is "------------")
|
|
// 5) local prefetch/crawling (initiator is own seedHash)
|
|
// 6) local fetching for global crawling (other known or unknwon initiator)
|
|
int processCase = plasmaSwitchboardConstants.PROCESSCASE_0_UNKNOWN;
|
|
// FIXME the equals seems to be incorrect: String.equals(boolean)
|
|
if ((initiator == null) || initiator.length() == 0 || initiator.equals("------------")) {
|
|
// proxy-load
|
|
processCase = plasmaSwitchboardConstants.PROCESSCASE_4_PROXY_LOAD;
|
|
} else if (initiator.equals(wordIndex.peers().mySeed().hash)) {
|
|
// normal crawling
|
|
processCase = plasmaSwitchboardConstants.PROCESSCASE_5_LOCAL_CRAWLING;
|
|
} else {
|
|
// this was done for remote peer (a global crawl)
|
|
processCase = plasmaSwitchboardConstants.PROCESSCASE_6_GLOBAL_CRAWLING;
|
|
}
|
|
return processCase;
|
|
}
|
|
|
|
/**
|
|
* decide upon header information if a specific file should be indexed
|
|
* this method returns null if the answer is 'YES'!
|
|
* if the answer is 'NO' (do not index), it returns a string with the reason
|
|
* to reject the crawling demand in clear text
|
|
*
|
|
* This function is used by plasmaSwitchboard#processResourceStack
|
|
*/
|
|
public final String shallIndexCacheForProxy() {
|
|
if (profile() == null) {
|
|
return "shallIndexCacheForProxy: profile() is null !";
|
|
}
|
|
|
|
// check profile
|
|
if (!profile().indexText() && !profile().indexMedia()) {
|
|
return "Indexing_Not_Allowed";
|
|
}
|
|
|
|
// -CGI access in request
|
|
// CGI access makes the page very individual, and therefore not usable in caches
|
|
if (!profile().crawlingQ()) {
|
|
if (url.isPOST()) {
|
|
return "Dynamic_(POST)";
|
|
}
|
|
if (url.isCGI()) {
|
|
return "Dynamic_(CGI)";
|
|
}
|
|
}
|
|
|
|
// -authorization cases in request
|
|
// we checked that in shallStoreCache
|
|
|
|
// -ranges in request
|
|
// we checked that in shallStoreCache
|
|
|
|
// a picture cannot be indexed
|
|
if (plasmaHTCache.noIndexingURL(url)) {
|
|
return "Media_Content_(forbidden)";
|
|
}
|
|
|
|
// -cookies in request
|
|
// unfortunately, we cannot index pages which have been requested with a cookie
|
|
// because the returned content may be special for the client
|
|
if (requestedWithCookie()) {
|
|
// System.out.println("***not indexed because cookie");
|
|
return "Dynamic_(Requested_With_Cookie)";
|
|
}
|
|
|
|
getResponseHeader();
|
|
if (responseHeader != null) {
|
|
// -set-cookie in response
|
|
// the set-cookie from the server does not indicate that the content is special
|
|
// thus we do not care about it here for indexing
|
|
|
|
// a picture cannot be indexed
|
|
final String mimeType = responseHeader.mime();
|
|
if (plasmaHTCache.isPicture(mimeType)) {
|
|
return "Media_Content_(Picture)";
|
|
}
|
|
if (!plasmaHTCache.isText(mimeType)) {
|
|
return "Media_Content_(not_text)";
|
|
}
|
|
|
|
// -if-modified-since in request
|
|
// if the page is fresh at the very moment we can index it
|
|
final Date ifModifiedSince = getModificationDate();
|
|
if ((ifModifiedSince != null) && (responseHeader.containsKey(httpResponseHeader.LAST_MODIFIED))) {
|
|
// parse date
|
|
Date d = responseHeader.lastModified();
|
|
if (d == null) {
|
|
d = new Date(DateFormatter.correctedUTCTime());
|
|
}
|
|
// finally, we shall treat the cache as stale if the modification time is after the if-.. time
|
|
if (d.after(ifModifiedSince)) {
|
|
//System.out.println("***not indexed because if-modified-since");
|
|
return "Stale_(Last-Modified>Modified-Since)";
|
|
}
|
|
}
|
|
|
|
// -pragma in cached response
|
|
if (responseHeader.containsKey(httpResponseHeader.PRAGMA) &&
|
|
(responseHeader.get(httpResponseHeader.PRAGMA)).toUpperCase().equals("NO-CACHE")) {
|
|
return "Denied_(pragma_no_cache)";
|
|
}
|
|
|
|
// see for documentation also:
|
|
// http://www.web-caching.com/cacheability.html
|
|
|
|
// look for freshnes information
|
|
|
|
// -expires in cached response
|
|
// the expires value gives us a very easy hint when the cache is stale
|
|
// sometimes, the expires date is set to the past to prevent that a page is cached
|
|
// we use that information to see if we should index it
|
|
final Date expires = responseHeader.expires();
|
|
if (expires != null && expires.before(new Date(DateFormatter.correctedUTCTime()))) {
|
|
return "Stale_(Expired)";
|
|
}
|
|
|
|
// -lastModified in cached response
|
|
// this information is too weak to use it to prevent indexing
|
|
// even if we can apply a TTL heuristic for cache usage
|
|
|
|
// -cache-control in cached response
|
|
// the cache-control has many value options.
|
|
String cacheControl = responseHeader.get(httpResponseHeader.CACHE_CONTROL);
|
|
if (cacheControl != null) {
|
|
cacheControl = cacheControl.trim().toUpperCase();
|
|
/* we have the following cases for cache-control:
|
|
"public" -- can be indexed
|
|
"private", "no-cache", "no-store" -- cannot be indexed
|
|
"max-age=<delta-seconds>" -- stale/fresh dependent on date
|
|
*/
|
|
if (cacheControl.startsWith("PRIVATE") ||
|
|
cacheControl.startsWith("NO-CACHE") ||
|
|
cacheControl.startsWith("NO-STORE")) {
|
|
// easy case
|
|
return "Stale_(denied_by_cache-control=" + cacheControl + ")";
|
|
// } else if (cacheControl.startsWith("PUBLIC")) {
|
|
// // ok, do nothing
|
|
} else if (cacheControl.startsWith("MAX-AGE=")) {
|
|
// we need also the load date
|
|
final Date date = responseHeader.date();
|
|
if (date == null) {
|
|
return "Stale_(no_date_given_in_response)";
|
|
}
|
|
try {
|
|
final long ttl = 1000 * Long.parseLong(cacheControl.substring(8)); // milliseconds to live
|
|
if (DateFormatter.correctedUTCTime() - date.getTime() > ttl) {
|
|
//System.out.println("***not indexed because cache-control");
|
|
return "Stale_(expired_by_cache-control)";
|
|
}
|
|
} catch (final Exception e) {
|
|
return "Error_(" + e.getMessage() + ")";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* decide upon header information if a specific file should be indexed
|
|
* this method returns null if the answer is 'YES'!
|
|
* if the answer is 'NO' (do not index), it returns a string with the reason
|
|
* to reject the crawling demand in clear text
|
|
*
|
|
* This function is used by plasmaSwitchboard#processResourceStack
|
|
*/
|
|
public final String shallIndexCacheForCrawler() {
|
|
if (profile() == null) {
|
|
return "shallIndexCacheForCrawler: profile() is null !";
|
|
}
|
|
|
|
// check profile
|
|
if (!profile().indexText() && !profile().indexMedia()) {
|
|
return "Indexing_Not_Allowed";
|
|
}
|
|
|
|
// -CGI access in request
|
|
// CGI access makes the page very individual, and therefore not usable in caches
|
|
if (!profile().crawlingQ()) {
|
|
if (url().isPOST()) { return "Dynamic_(POST)"; }
|
|
if (url().isCGI()) { return "Dynamic_(CGI)"; }
|
|
}
|
|
|
|
// -authorization cases in request
|
|
// we checked that in shallStoreCache
|
|
|
|
// -ranges in request
|
|
// we checked that in shallStoreCache
|
|
|
|
// a picture cannot be indexed
|
|
getResponseHeader();
|
|
if (responseHeader != null) {
|
|
final String mimeType = responseHeader.mime();
|
|
if (plasmaHTCache.isPicture(mimeType)) { return "Media_Content_(Picture)"; }
|
|
if (!plasmaHTCache.isText(mimeType)) { return "Media_Content_(not_text)"; }
|
|
}
|
|
if (plasmaHTCache.noIndexingURL(url())) { return "Media_Content_(forbidden)"; }
|
|
|
|
// -if-modified-since in request
|
|
// if the page is fresh at the very moment we can index it
|
|
// -> this does not apply for the crawler
|
|
|
|
// -cookies in request
|
|
// unfortunately, we cannot index pages which have been requested with a cookie
|
|
// because the returned content may be special for the client
|
|
// -> this does not apply for a crawler
|
|
|
|
// -set-cookie in response
|
|
// the set-cookie from the server does not indicate that the content is special
|
|
// thus we do not care about it here for indexing
|
|
// -> this does not apply for a crawler
|
|
|
|
// -pragma in cached response
|
|
// -> in the crawler we ignore this
|
|
|
|
// look for freshnes information
|
|
|
|
// -expires in cached response
|
|
// the expires value gives us a very easy hint when the cache is stale
|
|
// sometimes, the expires date is set to the past to prevent that a page is cached
|
|
// we use that information to see if we should index it
|
|
// -> this does not apply for a crawler
|
|
|
|
// -lastModified in cached response
|
|
// this information is too weak to use it to prevent indexing
|
|
// even if we can apply a TTL heuristic for cache usage
|
|
|
|
// -cache-control in cached response
|
|
// the cache-control has many value options.
|
|
// -> in the crawler we ignore this
|
|
|
|
return null;
|
|
}
|
|
|
|
/*
|
|
* (non-Javadoc)
|
|
*
|
|
* @see java.lang.Object#toString()
|
|
*/
|
|
public String toString() {
|
|
return "QueueEntry of "+ url.toString() + ", ref="+referrerHash +", initiator="+initiator +", flags="+ flags +", anchor="+ anchorName;
|
|
}
|
|
} // class Entry
|
|
} |