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/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
* The return value is well-defined only while the connection is open.
* It may change even while the connection is open,
* because of an {@link #update update}.
*
* @return the host to which this connection is opened
*/
HttpHost getTargetHost();
/**
* Indicates whether this connection is secure.
* The return value is well-defined only while the connection is open.
* It may change even while the connection is open,
* because of an {@link #update update}.
*
* @return true if this connection is secure,
* false otherwise
*/
boolean isSecure();
/**
* Obtains the socket for this connection.
* The return value is well-defined only while the connection is open.
* It may change even while the connection is open,
* because of an {@link #update update}.
*
* @return the socket for communicating with the
* {@link #getTargetHost target host}
*/
Socket getSocket();
/**
* Signals that this connection is in the process of being open.
*
* By calling this method, the connection can be re-initialized
* with a new Socket instance before {@link #openCompleted} is called.
* This enabled the connection to close that socket if
* {@link org.apache.http.HttpConnection#shutdown shutdown}
* is called before it is fully open. Closing an unconnected socket
* will interrupt a thread that is blocked on the connect.
* Otherwise, that thread will either time out on the connect,
* or it returns successfully and then opens this connection
* which was just shut down.
*
* This method can be called multiple times if the connection
* is layered over another protocol. Note: This method
* will not close the previously used socket. It is
* the caller's responsibility to close that socket if it is
* no longer required.
*
* The caller must invoke {@link #openCompleted} in order to complete
* the process.
*
* @param sock the unconnected socket which is about to
* be connected.
* @param target the target host of this connection
*/
void opening(Socket sock, HttpHost target)
throws IOException;
/**
* Signals that the connection has been successfully open.
* An attempt to call this method on an open connection will cause
* an exception.
*
* @param secure true if this connection is secure, for
* example if an SSLSocket is used, or
* false if it is not secure
* @param params parameters for this connection. The parameters will
* be used when creating dependent objects, for example
* to determine buffer sizes.
*/
void openCompleted(boolean secure, HttpParams params)
throws IOException;
/**
* Updates this connection.
* A connection can be updated only while it is open.
* Updates are used for example when a tunnel has been established,
* or when a TLS/SSL connection has been layered on top of a plain
* socket connection.
*
* Note: Updating the connection will not close the
* previously used socket. It is the caller's responsibility to close
* that socket if it is no longer required.
*
* @param sock the new socket for communicating with the target host,
* or null to continue using the old socket.
* If null is passed, helper objects that
* depend on the socket should be re-used. In that case,
* some changes in the parameters will not take effect.
* @param target the new target host of this connection
* @param secure true if this connection is now secure,
* false if it is not secure
* @param params new parameters for this connection
*/
void update(Socket sock, HttpHost target,
boolean secure, HttpParams params)
throws IOException;
}