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PastPolicy (Rice Pastry - API Specifications)
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rice.p2p.past</FONT>
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Interface PastPolicy</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../rice/p2p/past/PastPolicy.DefaultPastPolicy.html" title="class in rice.p2p.past">PastPolicy.DefaultPastPolicy</A></DD>
</DL>
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<DL>
<DT><PRE>public interface <B>PastPolicy</B></DL>
</PRE>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>$Id: PastPolicy.java 4654 2009-01-08 16:33:07Z jeffh $</DD>
<DT><B>Author:</B></DT>
  <DD>Alan Mislove</DD>
</DL>
<HR>

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<CODE>static&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../rice/p2p/past/PastPolicy.DefaultPastPolicy.html" title="class in rice.p2p.past">PastPolicy.DefaultPastPolicy</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The default policy for Past, which fetches any available copy of a replicated object and
 always allows inserts locally.</TD>
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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../rice/p2p/past/PastPolicy.html#allowInsert(rice.p2p.past.PastContent)">allowInsert</A></B>(<A HREF="../../../rice/p2p/past/PastContent.html" title="interface in rice.p2p.past">PastContent</A>&nbsp;content)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This method is call before an insert() is processed on the local node.</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../rice/p2p/past/PastPolicy.html#fetch(rice.p2p.commonapi.Id, rice.p2p.commonapi.NodeHandle, rice.persistence.Cache, rice.p2p.past.Past, rice.Continuation)">fetch</A></B>(<A HREF="../../../rice/p2p/commonapi/Id.html" title="interface in rice.p2p.commonapi">Id</A>&nbsp;id,
      <A HREF="../../../rice/p2p/commonapi/NodeHandle.html" title="class in rice.p2p.commonapi">NodeHandle</A>&nbsp;hint,
      <A HREF="../../../rice/persistence/Cache.html" title="interface in rice.persistence">Cache</A>&nbsp;backup,
      <A HREF="../../../rice/p2p/past/Past.html" title="interface in rice.p2p.past">Past</A>&nbsp;past,
      <A HREF="../../../rice/Continuation.html" title="interface in rice">Continuation</A>&nbsp;command)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This method is called when Past is told to fetch a key.</TD>
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<A NAME="fetch(rice.p2p.commonapi.Id, rice.p2p.commonapi.NodeHandle, rice.persistence.Cache, rice.p2p.past.Past, rice.Continuation)"><!-- --></A><H3>
fetch</H3>
<PRE>
void <B>fetch</B>(<A HREF="../../../rice/p2p/commonapi/Id.html" title="interface in rice.p2p.commonapi">Id</A>&nbsp;id,
           <A HREF="../../../rice/p2p/commonapi/NodeHandle.html" title="class in rice.p2p.commonapi">NodeHandle</A>&nbsp;hint,
           <A HREF="../../../rice/persistence/Cache.html" title="interface in rice.persistence">Cache</A>&nbsp;backup,
           <A HREF="../../../rice/p2p/past/Past.html" title="interface in rice.p2p.past">Past</A>&nbsp;past,
           <A HREF="../../../rice/Continuation.html" title="interface in rice">Continuation</A>&nbsp;command)</PRE>
<DL>
<DD>This method is called when Past is told to fetch a key.  This method allows the application
 to specify how a replica is fetched and authenticated.  The client should fetch the object
 (possibly using the past instance provided) and then return the object to the provided
 continuation.  The client *MUST* call the continuation at some point in the future, even if
 the request is lost.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>id</CODE> - The id to fetch<DD><CODE>past</CODE> - The local past instance<DD><CODE>backup</CODE> - The backup cache, where the object *might* be located<DD><CODE>command</CODE> - The command to call with the replica to store</DL>
</DD>
</DL>
<HR>

<A NAME="allowInsert(rice.p2p.past.PastContent)"><!-- --></A><H3>
allowInsert</H3>
<PRE>
boolean <B>allowInsert</B>(<A HREF="../../../rice/p2p/past/PastContent.html" title="interface in rice.p2p.past">PastContent</A>&nbsp;content)</PRE>
<DL>
<DD>This method is call before an insert() is processed on the local node.  This allows applications
 to make a decision on whether or not to store the replica.  Unless you know what you are doing,
 don't return anything but 'true' here.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>content</CODE> - The content about to be stored
<DT><B>Returns:</B><DD>Whether the insert should be allowed</DL>
</DD>
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