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/*
* Negotiation.java February 2007
*
* Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
*
* 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.simpleframework.transport;
import java.io.IOException;
import org.simpleframework.transport.reactor.Operation;
/**
* The <code>Negotiation</code> interface is used to represent an
* SSL negotiation. When an operation can not be completed this
* will allow a task to perform asynchronous operations and resume
* the negotiation when those operations can be fulfilled.
*
* @author Niall Gallagher
*/
interface Negotiation extends Operation {
/**
* This is used to resume the negotiation when an operation
* has completed. This will continue the decrypt and encrypt
* sequence of messages required to fulfil the negotiation.
*/
void resume() throws IOException;
/**
* This method is invoked when the negotiation is done and
* the next phase of the connection is to take place. This
* will typically be invoked when an SSL handshake or
* termination exchange has completed successfully.
*/
void commit() throws IOException;
/**
* This is used to send any messages the negotiation may have.
* If the negotiation can not send the information during its
* execution then this method will be executed when a select
* operation is signaled.
*
* @return this returns true when the message has been sent
*/
boolean send() throws IOException;
/**
* This is used to receive data from the other side. If at any
* point during the negotiation a message is required that
* can not be read immediately this is used to asynchronously
* read the data when a select operation is signaled.
*
* @return this returns true when the message has been read
*/
boolean receive() throws IOException;
}
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