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| <h2 title="Interface GatewayConflictResolver" class="title">Interface GatewayConflictResolver</h2> |
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| <pre>public interface <span class="typeNameLabel">GatewayConflictResolver</span></pre> |
| <div class="block">GatewayConflictResolver is a Cache-level plugin that is called upon to decide what to do with |
| events that originate in other systems and arrive through the WAN Gateway. A |
| GatewayConflictResolver is invoked if the current value in a cache entry was established by a |
| different distributed system (with a different distributed-system-id) than an event that is |
| attempting to modify the entry. It is not invoked if the event has the same distributed system ID |
| as the event that last changed the entry.</div> |
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| <dd>GemFire 7.0</dd> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/util/GatewayConflictResolver.html#onEvent-org.apache.geode.cache.util.TimestampedEntryEvent-org.apache.geode.cache.util.GatewayConflictHelper-">onEvent</a></span>(<a href="../../../../../org/apache/geode/cache/util/TimestampedEntryEvent.html" title="interface in org.apache.geode.cache.util">TimestampedEntryEvent</a> event, |
| <a href="../../../../../org/apache/geode/cache/util/GatewayConflictHelper.html" title="interface in org.apache.geode.cache.util">GatewayConflictHelper</a> helper)</code> |
| <div class="block">This method is invoked when a change is received from another distributed system and the last |
| modification to the affected cache entry did not also come from the same system.</div> |
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| <h4>onEvent</h4> |
| <pre>void onEvent(<a href="../../../../../org/apache/geode/cache/util/TimestampedEntryEvent.html" title="interface in org.apache.geode.cache.util">TimestampedEntryEvent</a> event, |
| <a href="../../../../../org/apache/geode/cache/util/GatewayConflictHelper.html" title="interface in org.apache.geode.cache.util">GatewayConflictHelper</a> helper)</pre> |
| <div class="block">This method is invoked when a change is received from another distributed system and the last |
| modification to the affected cache entry did not also come from the same system. |
| <p> |
| The given GatewayConflictHelper can be used to allow the change to be made to the cache, |
| disallow the modification or make a change to the value to be stored in the cache. |
| <p> |
| This method is invoked under synchronization on the cache entry in order to prevent it from |
| concurrent modification |
| <p> |
| For any two events, all GatewayConflictResolvers must make the same decision on the resolution |
| of the conflict in order to maintain consistency. They must do so regardless of the order of |
| the events. |
| <p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - the event that is in conflict with the current cache state</dd> |
| <dd><code>helper</code> - an object to be used in modifying the course of action for this event</dd> |
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