org.apache.catalina.CometEvent Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of payara-micro Show documentation
Show all versions of payara-micro Show documentation
Micro Distribution of the Payara Project
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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 org.apache.catalina;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* The CometEvent interface.
*
* @author Filip Hanik
* @author Remy Maucherat
*/
public interface CometEvent {
/**
* Enumeration describing the major events that the container can invoke
* the CometProcessors event() method with
* BEGIN - will be called at the beginning
* of the processing of the connection. It can be used to initialize any relevant
* fields using the request and response objects. Between the end of the processing
* of this event, and the beginning of the processing of the end or error events,
* it is possible to use the response object to write data on the open connection.
* Note that the response object and dependent OutputStream and Writer are still
* not synchronized, so when they are accessed by multiple threads,
* synchronization is mandatory. After processing the initial event, the request
* is considered to be committed.
* READ - This indicates that input data is available, and that one read can be made
* without blocking. The available and ready methods of the InputStream or
* Reader may be used to determine if there is a risk of blocking: the servlet
* should read while data is reported available, and can make one additional read
* without blocking. When encountering a read error or an EOF, the servlet MUST
* report it by either returning false or throwing an exception such as an
* IOException. This will cause the error event to be invoked, and the connection
* will be closed. It is not allowed to attempt reading data from the request object
* outside of the execution of this method.
* END - End may be called to end the processing of the request. Fields that have
* been initialized in the begin method should be reset. After this event has
* been processed, the request and response objects, as well as all their dependent
* objects will be recycled and used to process other requests.
* ERROR - Error will be called by the container in the case where an IO exception
* or a similar unrecoverable error occurs on the connection. Fields that have
* been initialized in the begin method should be reset. After this event has
* been processed, the request and response objects, as well as all their dependent
* objects will be recycled and used to process other requests.
*/
public enum EventType {BEGIN, READ, END, ERROR}
/**
* Event details
* TIMEOUT - the connection timed out (sub type of ERROR); note that this ERROR type is not fatal, and
* the connection will not be closed unless the servlet uses the close method of the event
* CLIENT_DISCONNECT - the client connection was closed (sub type of ERROR)
* IOEXCEPTION - an IO exception occurred, such as invalid content, for example, an invalid chunk block (sub type of ERROR)
* WEBAPP_RELOAD - the webapplication is being reloaded (sub type of END)
* SERVER_SHUTDOWN - the server is shutting down (sub type of END)
* SESSION_END - the servlet ended the session (sub type of END)
*/
public enum EventSubType { TIMEOUT, CLIENT_DISCONNECT, IOEXCEPTION, WEBAPP_RELOAD, SERVER_SHUTDOWN, SESSION_END }
/**
* Returns the HttpServletRequest.
*
* @return HttpServletRequest
*/
public HttpServletRequest getHttpServletRequest();
/**
* Returns the HttpServletResponse.
*
* @return HttpServletResponse
*/
public HttpServletResponse getHttpServletResponse();
/**
* Returns the event type.
*
* @return EventType
*/
public EventType getEventType();
/**
* Returns the sub type of this event.
*
* @return EventSubType
*/
public EventSubType getEventSubType();
/**
* Ends the Comet session. This signals to the container that
* the container wants to end the comet session. This will send back to the
* client a notice that the server has no more data to send as part of this
* request. The servlet should perform any needed cleanup as if it had received
* an END or ERROR event.
*
* @throws IOException if an IO exception occurs
*/
public void close() throws IOException;
/**
* Sets the timeout for this Comet connection. Please NOTE, that the implementation
* of a per connection timeout is OPTIONAL and MAY NOT be implemented.
* This method sets the timeout in milliseconds of idle time on the connection.
* The timeout is reset every time data is received from the connection or data is flushed
* using response.flushBuffer(). If a timeout occurs, the
* error(HttpServletRequest, HttpServletResponse) method is invoked. The
* web application SHOULD NOT attempt to reuse the request and response objects after a timeout
* as the error(HttpServletRequest, HttpServletResponse) method indicates.
* This method should not be called asynchronously, as that will have no effect.
*
* @param timeout The timeout in milliseconds for this connection, must be a positive value, larger than 0
* @throws IOException An IOException may be thrown to indicate an IO error,
* or that the EOF has been reached on the connection
* @throws ServletException An exception has occurred, as specified by the root
* cause
* @throws UnsupportedOperationException if per connection timeout is not supported, either at all or at this phase
* of the invocation.
*/
public void setTimeout(int timeout)
throws IOException, ServletException, UnsupportedOperationException;
}