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| <h2 title="Annotation Type IgniteAsyncCallback" class="title">Annotation Type IgniteAsyncCallback</h2> |
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| <pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/annotation/Retention.html?is-external=true" title="class or interface in java.lang.annotation">@Retention</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/annotation/Retention.html?is-external=true#value()" title="class or interface in java.lang.annotation">value</a>=<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/annotation/RetentionPolicy.html?is-external=true#RUNTIME" title="class or interface in java.lang.annotation">RUNTIME</a>) |
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| public @interface <span class="strong">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"> |
| @IgniteAsyncCallback |
| public class ExampleCacheEntryFilter implements CacheEntryEventFilter<Integer, Person> { |
| @IgniteInstanceResource |
| private Ignite ignite; |
| |
| // Continuous listener will be notified for persons with salary above 1000. |
| // Filter increases salary for some person on 100. Without @IgniteAsyncCallback annotation |
| // this operation is not safe. |
| public boolean evaluate(CacheEntryEvent<? extends K, ? extends V> evt) throws CacheEntryListenerException { |
| Person p = evt.getValue(); |
| |
| if (p.getSalary() > 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<Long, Person> qry = new ContinuousQuery<>(); |
| |
| // Callback that is called locally when update notifications are received. |
| // It simply prints out information about all created persons. |
| qry.setLocalListener((evts) -> { |
| for (CacheEntryEvent<? extends Long, ? extends Person> 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<Cache.Entry<Long, Person>> cur = cache.query(qry); |
| </pre></div> |
| <dl><dt><span class="strong">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/ContinuousQuery.html#getRemoteFilterFactory()"><code>ContinuousQuery.getRemoteFilterFactory()</code></a>, |
| <a href="../../../../org/apache/ignite/cache/query/ContinuousQuery.html#getLocalListener()"><code>ContinuousQuery.getLocalListener()</code></a></dd></dl> |
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