rice.p2p.past
Interface PastPolicy

All Known Implementing Classes:

PastPolicy.DefaultPastPolicy

public interface PastPolicy

Version:

$Id: PastPolicy.java 2302 2005-03-11 00:58:26Z jeffh $

Author:

Alan Mislove

Nested Class Summary

static class

PastPolicy.DefaultPastPolicy The default policy for Past, which fetches any available copy of a replicated object and always allows inserts locally.

Method Summary

boolean	allowInsert(PastContent content) This method is call before an insert() is processed on the local node.
void	fetch(Id id, NodeHandle hint, Cache backup, Past past, Continuation command) This method is called when Past is told to fetch a key.

Method Detail

fetch

public void fetch(Id id,
                  NodeHandle hint,
                  Cache backup,
                  Past past,
                  Continuation command)

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.

Parameters:

id - The id to fetch

past - The local past instance

backup - The backup cache, where the object *might* be located

command - The command to call with the replica to store

hint - DESCRIBE THE PARAMETER

allowInsert

public boolean allowInsert(PastContent content)

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.

Parameters:

content - The content about to be stored

Returns:

Whether the insert should be allowed