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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public interface <span class="typeNameLabel">ServiceStateChangeListener</span></pre> |
| <div class="block">Interface to notify state changes of a service.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/service/ServiceStateChangeListener.html#stateChanged-org.apache.hadoop.service.Service-">stateChanged</a></span>(<a href="../../../../org/apache/hadoop/service/Service.html" title="interface in org.apache.hadoop.service">Service</a> service)</code> |
| <div class="block">Callback to notify of a state change.</div> |
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| <h4>stateChanged</h4> |
| <pre>void stateChanged(<a href="../../../../org/apache/hadoop/service/Service.html" title="interface in org.apache.hadoop.service">Service</a> service)</pre> |
| <div class="block">Callback to notify of a state change. The service will already |
| have changed state before this callback is invoked. |
| |
| This operation is invoked on the thread that initiated the state change, |
| while the service itself in in a sychronized section. |
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| <li>Any long-lived operation here will prevent the service state |
| change from completing in a timely manner.</li> |
| <li>If another thread is somehow invoked from the listener, and |
| that thread invokes the methods of the service (including |
| subclass-specific methods), there is a risk of a deadlock.</li> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>service</code> - the service that has changed.</dd> |
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