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<div class="subTitle">org.apache.ignite.lang</div>
<h2 title="Annotation Type IgniteAsyncCallback" class="title">Annotation Type IgniteAsyncCallback</h2>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Retention.html?is-external=true" title="class or interface in java.lang.annotation">@Retention</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Retention.html?is-external=true#value--" title="class or interface in java.lang.annotation">value</a>=<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/RetentionPolicy.html?is-external=true#RUNTIME" title="class or interface in java.lang.annotation">RUNTIME</a>)
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Target.html?is-external=true" title="class or interface in java.lang.annotation">@Target</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Target.html?is-external=true#value--" title="class or interface in java.lang.annotation">value</a>=<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#TYPE" title="class or interface in java.lang.annotation">TYPE</a>)
public @interface <span class="memberNameLabel">IgniteAsyncCallback</span></pre>
<div class="block">If callback has this annotation then it will be executing in another thread.
<p>
Currently this annotation is supported for:
<ol>
<li><a href="../../../../org/apache/ignite/cache/query/ContinuousQuery.html" title="class in org.apache.ignite.cache.query"><code>ContinuousQuery</code></a> - <code>CacheEntryUpdatedListener</code> and <code>CacheEntryEventFilter</code>.</li>
</ol>
<p>
For example, if <code>filter</code> or <code>CacheEntryListener</code>
has the annotation then callbacks will be executing to asyncCallback thread pool. It allows to use cache API
in a callbacks. This thread pool can be configured by <a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#setAsyncCallbackPoolSize-int-"><code>IgniteConfiguration.setAsyncCallbackPoolSize(int)</code></a>.
<h1 class="header">Example</h1>
As an example, suppose we have cache with <code>'Person'</code> objects and we need
to query all persons with salary above then 1000. Also remote filter will update some entries.
<p>
Here is the <code>Person</code> class:
<pre name="code" class="java">
public class Person {
// Name.
private String name;
// Salary.
private double salary;
...
}
</pre>
<p>
Here is the <code>ExampleCacheEntryFilter</code> class:
<pre name="code" class="java">
&#064;IgniteAsyncCallback
public class ExampleCacheEntryFilter implements CacheEntryEventFilter&lt;Integer, Person&gt; {
&#064;IgniteInstanceResource
private Ignite ignite;
// Continuous listener will be notified for persons with salary above 1000.
// Filter increases salary for some person on 100. Without &#064;IgniteAsyncCallback annotation
// this operation is not safe.
public boolean evaluate(CacheEntryEvent&lt;? extends K, ? extends V&gt; evt) throws CacheEntryListenerException {
Person p = evt.getValue();
if (p.getSalary() &gt; 1000)
return true;
ignite.cache("Person").put(evt.getKey(), new Person(p.getName(), p.getSalary() + 100));
return false;
}
}
</pre>
<p>
Query with asynchronous callback execute as usually:
<pre name="code" class="java">
// Create new continuous query.
ContinuousQuery&lt;Long, Person&gt; qry = new ContinuousQuery&lt;&gt;();
// Callback that is called locally when update notifications are received.
// It simply prints out information about all created persons.
qry.setLocalListener((evts) -> {
for (CacheEntryEvent&lt;? extends Long, ? extends Person&gt; e : evts) {
Person p = e.getValue();
System.out.println(p.getFirstName() + " " + p.getLastName() + "'s salary is " + p.getSalary());
}
});
// Sets remote filter.
qry.setRemoteFilterFactory(() -> new ExampleCacheEntryFilter());
// Execute query.
QueryCursor&lt;Cache.Entry&lt;Long, Person&gt;&gt; cur = cache.query(qry);
</pre></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getAsyncCallbackPoolSize--"><code>IgniteConfiguration.getAsyncCallbackPoolSize()</code></a>,
<a href="../../../../org/apache/ignite/cache/query/AbstractContinuousQuery.html#getRemoteFilterFactory--"><code>AbstractContinuousQuery.getRemoteFilterFactory()</code></a>,
<a href="../../../../org/apache/ignite/cache/query/ContinuousQuery.html#getLocalListener--"><code>ContinuousQuery.getLocalListener()</code></a></dd>
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