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| <h2 title="Interface PollingIncrementalAdaptor" class="title">Interface PollingIncrementalAdaptor</h2> |
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| <pre>public interface <strong>PollingIncrementalAdaptor</strong> |
| extends <a href="../../../../com/google/enterprise/adaptor/Adaptor.html" title="interface in com.google.enterprise.adaptor">Adaptor</a></pre> |
| <div class="block">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.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../com/google/enterprise/adaptor/PollingIncrementalAdaptor.html#getModifiedDocIds(com.google.enterprise.adaptor.DocIdPusher)">getModifiedDocIds</a></strong>(<a href="../../../../com/google/enterprise/adaptor/DocIdPusher.html" title="interface in com.google.enterprise.adaptor">DocIdPusher</a> pusher)</code> |
| <div class="block">Check for documents modified since the last call to the method.</div> |
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| <h3>Methods inherited from interface com.google.enterprise.adaptor.<a href="../../../../com/google/enterprise/adaptor/Adaptor.html" title="interface in com.google.enterprise.adaptor">Adaptor</a></h3> |
| <code><a href="../../../../com/google/enterprise/adaptor/Adaptor.html#destroy()">destroy</a>, <a href="../../../../com/google/enterprise/adaptor/Adaptor.html#getDocContent(com.google.enterprise.adaptor.Request, com.google.enterprise.adaptor.Response)">getDocContent</a>, <a href="../../../../com/google/enterprise/adaptor/Adaptor.html#getDocIds(com.google.enterprise.adaptor.DocIdPusher)">getDocIds</a>, <a href="../../../../com/google/enterprise/adaptor/Adaptor.html#init(com.google.enterprise.adaptor.AdaptorContext)">init</a>, <a href="../../../../com/google/enterprise/adaptor/Adaptor.html#initConfig(com.google.enterprise.adaptor.Config)">initConfig</a>, <a href="../../../../com/google/enterprise/adaptor/Adaptor.html#isUserAuthorized(com.google.enterprise.adaptor.AuthnIdentity, java.util.Collection)">isUserAuthorized</a></code></li> |
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| <h4>getModifiedDocIds</h4> |
| <pre>void getModifiedDocIds(<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> |
| <div class="block">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.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>pusher</code> - convenience reference to pusher</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <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> |
| <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></dd></dl> |
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