javax.servlet.AsyncListener Maven / Gradle / Ivy
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package javax.servlet;
import java.io.IOException;
import java.util.EventListener;
/**
* Listener that will be notified in the event that an asynchronous
* operation initiated on a ServletRequest to which the listener had been
* added has completed, timed out, or resulted in an error.
*
* @since Servlet 3.0
*/
public interface AsyncListener extends EventListener {
/**
* Notifies this AsyncListener that an asynchronous operation
* has been completed.
*
* The {@link AsyncContext} corresponding to the asynchronous
* operation that has been completed may be obtained by calling
* {@link AsyncEvent#getAsyncContext getAsyncContext} on the given
* event.
*
*
In addition, if this AsyncListener had been registered via a call
* to {@link AsyncContext#addListener(AsyncListener,
* ServletRequest, ServletResponse)}, the supplied ServletRequest and
* ServletResponse objects may be retrieved by calling
* {@link AsyncEvent#getSuppliedRequest getSuppliedRequest} and
* {@link AsyncEvent#getSuppliedResponse getSuppliedResponse},
* respectively, on the given event.
*
* @param event the AsyncEvent indicating that an asynchronous
* operation has been completed
*
* @throws IOException if an I/O related error has occurred during the
* processing of the given AsyncEvent
*/
public void onComplete(AsyncEvent event) throws IOException;
/**
* Notifies this AsyncListener that an asynchronous operation
* has timed out.
*
*
The {@link AsyncContext} corresponding to the asynchronous
* operation that has timed out may be obtained by calling
* {@link AsyncEvent#getAsyncContext getAsyncContext} on the given
* event.
*
*
In addition, if this AsyncListener had been registered via a call
* to {@link AsyncContext#addListener(AsyncListener,
* ServletRequest, ServletResponse)}, the supplied ServletRequest and
* ServletResponse objects may be retrieved by calling
* {@link AsyncEvent#getSuppliedRequest getSuppliedRequest} and
* {@link AsyncEvent#getSuppliedResponse getSuppliedResponse},
* respectively, on the given event.
*
* @param event the AsyncEvent indicating that an asynchronous
* operation has timed out
*
* @throws IOException if an I/O related error has occurred during the
* processing of the given AsyncEvent
*/
public void onTimeout(AsyncEvent event) throws IOException;
/**
* Notifies this AsyncListener that an asynchronous operation
* has failed to complete.
*
*
The {@link AsyncContext} corresponding to the asynchronous
* operation that failed to complete may be obtained by calling
* {@link AsyncEvent#getAsyncContext getAsyncContext} on the given
* event.
*
*
In addition, if this AsyncListener had been registered via a call
* to {@link AsyncContext#addListener(AsyncListener,
* ServletRequest, ServletResponse)}, the supplied ServletRequest and
* ServletResponse objects may be retrieved by calling
* {@link AsyncEvent#getSuppliedRequest getSuppliedRequest} and
* {@link AsyncEvent#getSuppliedResponse getSuppliedResponse},
* respectively, on the given event.
*
* @param event the AsyncEvent indicating that an asynchronous
* operation has failed to complete
*
* @throws IOException if an I/O related error has occurred during the
* processing of the given AsyncEvent
*/
public void onError(AsyncEvent event) throws IOException;
/**
* Notifies this AsyncListener that a new asynchronous cycle is being
* initiated via a call to one of the {@link ServletRequest#startAsync}
* methods.
*
*
The {@link AsyncContext} corresponding to the asynchronous
* operation that is being reinitialized may be obtained by calling
* {@link AsyncEvent#getAsyncContext getAsyncContext} on the given
* event.
*
*
In addition, if this AsyncListener had been registered via a call
* to {@link AsyncContext#addListener(AsyncListener,
* ServletRequest, ServletResponse)}, the supplied ServletRequest and
* ServletResponse objects may be retrieved by calling
* {@link AsyncEvent#getSuppliedRequest getSuppliedRequest} and
* {@link AsyncEvent#getSuppliedResponse getSuppliedResponse},
* respectively, on the given event.
*
*
This AsyncListener will not receive any events related to the
* new asynchronous cycle unless it registers itself (via a call
* to {@link AsyncContext#addListener}) with the AsyncContext that
* is delivered as part of the given AsyncEvent.
*
* @param event the AsyncEvent indicating that a new asynchronous
* cycle is being initiated
*
* @throws IOException if an I/O related error has occurred during the
* processing of the given AsyncEvent
*/
public void onStartAsync(AsyncEvent event) throws IOException;
}