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| <h2 title="Interface AsyncEventListener" class="title">Interface AsyncEventListener</h2> |
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| <dd><a href="../../../../../org/apache/geode/cache/CacheCallback.html" title="interface in org.apache.geode.cache">CacheCallback</a>, <a href="../../../../../org/apache/geode/cache/Declarable.html" title="interface in org.apache.geode.cache">Declarable</a></dd> |
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| <dd><a href="../../../../../org/apache/geode/connectors/jdbc/JdbcAsyncWriter.html" title="class in org.apache.geode.connectors.jdbc">JdbcAsyncWriter</a></dd> |
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| <pre>public interface <span class="typeNameLabel">AsyncEventListener</span> |
| extends <a href="../../../../../org/apache/geode/cache/CacheCallback.html" title="interface in org.apache.geode.cache">CacheCallback</a></pre> |
| <div class="block">A callback for events passing through the <code>AsyncEventQueue</code> to which this listener is |
| attached. Implementers of interface <code>AsyncEventListener</code> process batches of |
| <code>AsyncEvent</code> delivered by the corresponding <code>AsyncEventQueue</code>. <br> |
| A sample implementation of this interface is as follows: <br> |
| |
| <pre> |
| public class MyEventListener implements AsyncEventListener { |
| |
| public boolean processEvents(List<AsyncEvent> events) { |
| for (Iterator i = events.iterator(); i.hasNext();) { |
| AsyncEvent event = (AsyncEvent) i.next(); |
| |
| String originalRegionName = event.getRegion().getName(); |
| // For illustration purpose, use the event to update the duplicate of above region. |
| final Region duplicateRegion = |
| CacheHelper.getCache().getRegion(originalRegionName + "_DUP"); |
| |
| final Object key = event.getKey(); |
| final Object value = event.getDeserializedValue(); |
| final Operation op = event.getOperation(); |
| |
| if (op.isCreate()) { |
| duplicateRegion.create(key, value); |
| } else if (op.isUpdate()) { |
| duplicateRegion.put(key, value); |
| } else if (op.isDestroy()) { |
| duplicateRegion.destroy(key); |
| } |
| |
| } |
| return true; |
| } |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 7.0</dd> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/asyncqueue/AsyncEventListener.html#processEvents-java.util.List-">processEvents</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../org/apache/geode/cache/asyncqueue/AsyncEvent.html" title="interface in org.apache.geode.cache.asyncqueue">AsyncEvent</a>> events)</code> |
| <div class="block">Process the list of <code>AsyncEvent</code>s.</div> |
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| <code><a href="../../../../../org/apache/geode/cache/CacheCallback.html#close--">close</a></code></li> |
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| <code><a href="../../../../../org/apache/geode/cache/Declarable.html#init-java.util.Properties-">init</a>, <a href="../../../../../org/apache/geode/cache/Declarable.html#initialize-org.apache.geode.cache.Cache-java.util.Properties-">initialize</a></code></li> |
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| <h4>processEvents</h4> |
| <pre>boolean processEvents(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../org/apache/geode/cache/asyncqueue/AsyncEvent.html" title="interface in org.apache.geode.cache.asyncqueue">AsyncEvent</a>> events)</pre> |
| <div class="block">Process the list of <code>AsyncEvent</code>s. This method will asynchronously be called when |
| events are queued to be processed. The size of the list will be up to batch size events where |
| batch size is defined in the <code>AsyncEventQueueFactory</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>events</code> - The list of <code>AsyncEvent</code> to process</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>boolean True represents whether the events were successfully processed, false |
| otherwise.</dd> |
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