javax.servlet.WriteListener Maven / Gradle / Ivy
/*
* Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package javax.servlet;
import java.io.IOException;
import java.util.EventListener;
/**
*
* Callback notification mechanism that signals to the developer it's possible
* to write content without blocking.
*
* @since Servlet 3.1
*/
public interface WriteListener extends EventListener {
/**
* When an instance of the WriteListener is registered with a {@link ServletOutputStream},
* this method will be invoked by the container the first time when it is possible
* to write data. Subsequently the container will invoke this method if and only
* if the {@link javax.servlet.ServletOutputStream#isReady()} method
* has been called and has returned a value of false and a write
* operation has subsequently become possible.
*
* @throws IOException if an I/O related error has occurred during processing
*/
public void onWritePossible() throws IOException;
/**
* Invoked when an error occurs writing data using the non-blocking APIs.
*
* @param t the throwable to indicate why the write operation failed
*/
public void onError(final Throwable t);
}