adaptiverevisithostqueue.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

                     java.io.IOException</PRE>
<DL>
<DD>Returns the URI with the earliest time of next processing. I.e. the URI
 at the head of this host based priority queue.
 <p>
 Note: This method will return the head CrawlURI regardless of wether it 
 is safe to start processing it or not. CrawlURI will remain in the queue.
 The returned CrawlURI should only be used for queue inspection, it can 
 <i>not</i> be updated and returned to the queue. To get URIs ready for
 processing use <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#next()"><CODE>next()</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the URI with the earliest time of next processing or null if 
         the queue is empty or all URIs are currently being processed.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE>
<DD><CODE>java.io.IOException</CODE> - if an error occurs reading from the database</DL>
</DD>
</DL>
<HR>

<A NAME="getState()"><!-- --></A><H3>
getState</H3>
<PRE>
public int <B>getState</B>()</PRE>
<DL>
<DD>Returns the current state of the HQ.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the current state of the HQ.<DT><B>See Also:</B><DD><A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#HQSTATE_BUSY"><CODE>HQSTATE_BUSY</CODE></A>, 
<A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#HQSTATE_EMPTY"><CODE>HQSTATE_EMPTY</CODE></A>, 
<A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#HQSTATE_READY"><CODE>HQSTATE_READY</CODE></A>, 
<A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#HQSTATE_SNOOZED"><CODE>HQSTATE_SNOOZED</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getNextReadyTime()"><!-- --></A><H3>
getNextReadyTime</H3>
<PRE>
public long <B>getNextReadyTime</B>()</PRE>
<DL>
<DD>Returns the time when the HQ will next be ready to issue a URI. 
 <p>
 If the queue is in a <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#HQSTATE_SNOOZED"><CODE>snoozed</CODE></A> state then this 
 time will be in the future and reflects either the time when the HQ will
 again be able to issue URIs for processing because politness constraints
 have ended, or when a URI next becomes available for visit, whichever is
 larger.
 <p>
 If the queue is in a <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#HQSTATE_READY"><CODE>ready</CODE></A> state this time will
 be in the past and reflect the earliest time when the HQ had a URI ready
 for processing, taking time spent snoozed for politness concerns into
 account. 
 <p>
 If the HQ is in any other state then the return value of this method is
 equal to Long.MAX_VALUE.
 <p>
 This value may change each time a URI is added, issued or updated.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the time when the HQ will next be ready to issue a URI</DL>
</DD>
</DL>
<HR>

<A NAME="setNextReadyTime(long)"><!-- --></A><H3>
setNextReadyTime</H3>
<PRE>
protected void <B>setNextReadyTime</B>(long&nbsp;newTime)</PRE>
<DL>
<DD>Updates nextReadyTime (if smaller) with the supplied value
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>newTime</CODE> - the new value of nextReady Time;</DL>
</DD>
</DL>
<HR>

<A NAME="reorder()"><!-- --></A><H3>
reorder</H3>
<PRE>
protected void <B>reorder</B>()</PRE>
<DL>
<DD>Method is called whenever something has been done that might have
 changed the value of the 'published' time of next ready. If an owner 
 has been specified it will be notified that the value may have changed..
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getStateByName()"><!-- --></A><H3>
getStateByName</H3>
<PRE>
public java.lang.String <B>getStateByName</B>()</PRE>
<DL>
<DD>Same as <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitHostQueue.html#getState()"><CODE>getState()</CODE></A> except this method returns a 
 human readable name for the state instead of its constant integer value.
 <p>
 Should only be used for reports, error messages and other strings 
 intended for human eyes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the human readable name of the current state</DL>
</DD>
</DL>
<HR>

<A NAME="getSize()"><!-- --></A><H3>
getSize</H3>
<PRE>
public long <B>getSize</B>()</PRE>
<DL>
<DD>Returns the size of the HQ. That is, the number of URIs queued, 
 including any that are currently being processed.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the size of the HQ.</DL>
</DD>
</DL>
<HR>

<A NAME="setOwner(org.archive.crawler.frontier.AdaptiveRevisitQueueList)"><!-- --></A><H3>
setOwner</H3>
<PRE>
public void <B>setOwner</B>(<A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitQueueList.html" title="class in org.archive.crawler.frontier">AdaptiveRevisitQueueList</A>&nbsp;owner)</PRE>
<DL>
<DD>Set the AdaptiveRevisitQueueList object that contains this HQ. Will cause
 that
 object to be notified (via 
 <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitQueueList.html#reorder(org.archive.crawler.frontier.AdaptiveRevisitHostQueue)"><CODE>reorder()</CODE></A> when the
 value used for sorting the list of HQs changes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>owner</CODE> - the ARHostQueueList object that contains this HQ.</DL>
</DD>
</DL>
<HR>

<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
           throws java.io.IOException</PRE>
<DL>
<DD>Cleanup all open Berkeley Database objects.
 <p>
 Does <I>not</I> close the Environment.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if an error occurs closing a database object</DL>
</DD>
</DL>
<HR>

<A NAME="report(int)"><!-- --></A><H3>
report</H3>
<PRE>
public java.lang.String <B>report</B>(int&nbsp;max)</PRE>
<DL>
<DD>Returns a report detailing the status of this HQ.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>max</CODE> - Maximum number of URIs to show. 0 equals no limit.
<DT><B>Returns:</B><DD>a report detailing the status of this HQ.</DL>
</DD>
</DL>
<HR>

<A NAME="getSubstats()"><!-- --></A><H3>
getSubstats</H3>
<PRE>
public <A HREF="../../../../org/archive/crawler/datamodel/CrawlSubstats.html" title="class in org.archive.crawler.datamodel">CrawlSubstats</A> <B>getSubstats</B>()</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/archive/crawler/datamodel/CrawlSubstats.HasCrawlSubstats.html#getSubstats()">getSubstats</A></CODE> in interface <CODE><A HREF="../../../../org/archive/crawler/datamodel/CrawlSubstats.HasCrawlSubstats.html" title="interface in org.archive.crawler.datamodel">CrawlSubstats.HasCrawlSubstats</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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