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| com.google.enterprise.adaptor</FONT> |
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| Interface PollingIncrementalLister</H2> |
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| <DL> |
| <DT><PRE>public interface <B>PollingIncrementalLister</B></DL> |
| </PRE> |
| |
| <P> |
| Interface for library-assisted polling incremental adaptors. This means that |
| the adaptor can provide incremental changes, must poll to notice changes, |
| and wants the adaptor library to help out. |
| |
| <p>If the adaptor has no <em>easy</em> way of determining repository changes, |
| then it should not implement this interface and let the GSA naturally find |
| changes. If the adaptor can use an event-based method of discovering changes, |
| it should use that method instead. If an adaptor doesn't want to relinguish |
| control to the frequency of the polling and other such details, then there is |
| no need to use this interface; simply manually using <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Timer.html?is-external=true" title="class or interface in java.util"><CODE>Timer</CODE></A> |
| is appropriate for a adaptor to do if it wishes. |
| |
| <p>Implementing this interface does improve the ease of configuring the |
| adaptor for the user. Thus, adaptors are encouraged to implement this |
| interface if it is applicable. |
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| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../com/google/enterprise/adaptor/PollingIncrementalLister.html#getModifiedDocIds(com.google.enterprise.adaptor.DocIdPusher)">getModifiedDocIds</A></B>(<A HREF="../../../../com/google/enterprise/adaptor/DocIdPusher.html" title="interface in com.google.enterprise.adaptor">DocIdPusher</A> pusher)</CODE> |
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| Check for documents modified since the last call to the method.</TD> |
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| <A NAME="getModifiedDocIds(com.google.enterprise.adaptor.DocIdPusher)"><!-- --></A><H3> |
| getModifiedDocIds</H3> |
| <PRE> |
| void <B>getModifiedDocIds</B>(<A HREF="../../../../com/google/enterprise/adaptor/DocIdPusher.html" title="interface in com.google.enterprise.adaptor">DocIdPusher</A> pusher) |
| throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>, |
| <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE> |
| <DL> |
| <DD>Check for documents modified since the last call to the method. This method |
| is intended to provide little-effort updates to the GSA about recent |
| modifications. Providing updates here allows greatly decreasing the amount |
| of latency before the GSA notices a document was added/modified/deleted, |
| but nothing more. It does not need to be perfect since the GSA's recrawling |
| will notice modifications and deletions and <A HREF="../../../../com/google/enterprise/adaptor/Adaptor.html#getDocIds(com.google.enterprise.adaptor.DocIdPusher)"><CODE>Adaptor.getDocIds(com.google.enterprise.adaptor.DocIdPusher)</CODE></A> will |
| provide additions. |
| |
| <p>For the first invocation, implementations can simply provide a small |
| amount of very recent history (e.g., last five revisions or last hour of |
| modifications) or provide no history and just initialize data structures |
| for future invocations. Adaptors are always encouraged to not persist |
| state; providing recent history during the first invocation allows the |
| adaptor to handle upgrades, computer restarts, and power outages without |
| trouble and still provide low-latency for those time periods. If an hour is |
| too short a period of time, then feel free to send a day's worth of history |
| instead. However, remember that missing modifications here only increases |
| the amount of latency before the GSA notices the modification. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>pusher</CODE> - convenience reference to pusher |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE> |
| <DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL> |
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