/*

* Licensed to the Apache Software Foundation (ASF) under one or more

* contributor license agreements. See the NOTICE file distributed with

* this work for additional information regarding copyright ownership.

* The ASF licenses this file to You under the Apache License, Version 2.0

* (the "License"); you may not use this file except in compliance with

* the License. You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

package javax.servlet;

import java.io.IOException;

/**

* Receives notification of write events when using non-blocking IO.

*

* @since Servlet 3.1

*/

public interface WriteListener extends java.util.EventListener{

/**

* Invoked when it it possible to write data without blocking. The container

* will invoke this method the first time for a request as soon as data can

* be written. Subsequent invocations will only occur if a call to

* {@link ServletOutputStream#isReady()} has returned false and it has since

* become possible to write data.

*

* @throws IOException if an I/O error occurs while processing this event

*/

public void onWritePossible() throws IOException;

/**

* Invoked if an error occurs while writing the response.

*

* @param throwable The throwable that represents the error that occurred

*/

public void onError(java.lang.Throwable throwable);

}