org.cometd.Extension Maven / Gradle / Ivy
// ========================================================================
// Copyright 2007 Dojo 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.cometd;
/**
* Cometd extension interface.
*
* This interface is used both for server extensions and for client
* extensions.
*
* @see Bayeux#addExtension(Extension)
* @see Client#addExtension(Extension)
*
*/
public interface Extension
{
/**
* @param from
* @param message
* @return modified message or null to discard message
*/
Message rcv(Client from, Message message);
/**
* @param from
* @param message
* @return modified message
*/
Message rcvMeta(Client from, Message message);
/**
* @param from
* @param message
* @return modified message or null to discard message
*/
Message send(Client from, Message message);
/**
* @param from
* @param message
* @return modified message
*/
Message sendMeta(Client from, Message message);
}