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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
*
* Note: Whether the underlying socket is an SSL socket
* can not necessarily be determined via {@link #isSecure}.
* Plain sockets may be considered secure, for example if they are
* connected to a known host in the same network segment.
* On the other hand, SSL sockets may be considered insecure,
* for example depending on the chosen cipher suite.
*
*
* @return the underlying SSL session if available,
* {@code null} otherwise
*/
@Override
SSLSession getSSLSession();
/**
* Opens this connection according to the given route.
*
* @param route the route along which to open. It will be opened to
* the first proxy if present, or directly to the target.
* @param context the context for opening this connection
* @param params the parameters for opening this connection
*
* @throws IOException in case of a problem
*/
void open(HttpRoute route, HttpContext context, HttpParams params)
throws IOException;
/**
* Indicates that a tunnel to the target has been established.
* The route is the one previously passed to {@link #open open}.
* Subsequently, {@link #layerProtocol layerProtocol} can be called
* to layer the TLS/SSL protocol on top of the tunnelled connection.
*
* Note: In HttpClient 3, a call to the corresponding method
* would automatically trigger the layering of the TLS/SSL protocol.
* This is not the case anymore, you can establish a tunnel without
* layering a new protocol over the connection.
*
*
* @param secure {@code true} if the tunnel should be considered
* secure, {@code false} otherwise
* @param params the parameters for tunnelling this connection
*
* @throws IOException in case of a problem
*/
void tunnelTarget(boolean secure, HttpParams params)
throws IOException;
/**
* Indicates that a tunnel to an intermediate proxy has been established.
* This is used exclusively for so-called proxy chains, where
* a request has to pass through multiple proxies before reaching the
* target. In that case, all proxies but the last need to be tunnelled
* when establishing the connection. Tunnelling of the last proxy to the
* target is optional and would be indicated via {@link #tunnelTarget}.
*
* @param next the proxy to which the tunnel was established.
* This is not the proxy through which
* the tunnel was established, but the new end point
* of the tunnel. The tunnel does not yet
* reach to the target, use {@link #tunnelTarget}
* to indicate an end-to-end tunnel.
* @param secure {@code true} if the connection should be
* considered secure, {@code false} otherwise
* @param params the parameters for tunnelling this connection
*
* @throws IOException in case of a problem
*/
void tunnelProxy(HttpHost next, boolean secure, HttpParams params)
throws IOException;
/**
* Layers a new protocol on top of a {@link #tunnelTarget tunnelled}
* connection. This is typically used to create a TLS/SSL connection
* through a proxy.
* The route is the one previously passed to {@link #open open}.
* It is not guaranteed that the layered connection is
* {@link #isSecure secure}.
*
* @param context the context for layering on top of this connection
* @param params the parameters for layering on top of this connection
*
* @throws IOException in case of a problem
*/
void layerProtocol(HttpContext context, HttpParams params)
throws IOException;
/**
* Marks this connection as being in a reusable communication state.
* The checkpoints for reuseable communication states (in the absence
* of pipelining) are before sending a request and after receiving
* the response in its entirety.
* The connection will automatically clear the checkpoint when
* used for communication. A call to this method indicates that
* the next checkpoint has been reached.
*
* A reusable communication state is necessary but not sufficient
* for the connection to be reused.
* A {@link #getRoute route} mismatch, the connection being closed,
* or other circumstances might prevent reuse.
*
*/
void markReusable();
/**
* Marks this connection as not being in a reusable state.
* This can be used immediately before releasing this connection
* to prevent its reuse. Reasons for preventing reuse include
* error conditions and the evaluation of a
* {@link org.apache.http.ConnectionReuseStrategy reuse strategy}.
*
* Note:
* It is not necessary to call here before writing to
* or reading from this connection. Communication attempts will
* automatically unmark the state as non-reusable. It can then
* be switched back using {@link #markReusable markReusable}.
*
*/
void unmarkReusable();
/**
* Indicates whether this connection is in a reusable communication state.
* See {@link #markReusable markReusable} and
* {@link #unmarkReusable unmarkReusable} for details.
*
* @return {@code true} if this connection is marked as being in
* a reusable communication state,
* {@code false} otherwise
*/
boolean isMarkedReusable();
/**
* Assigns a state object to this connection. Connection managers may make
* use of the connection state when allocating persistent connections.
*
* @param state The state object
*/
void setState(Object state);
/**
* Returns the state object associated with this connection.
*
* @return The state object
*/
Object getState();
/**
* Sets the duration that this connection can remain idle before it is
* reused. The connection should not be used again if this time elapses. The
* idle duration must be reset after each request sent over this connection.
* The elapsed time starts counting when the connection is released, which
* is typically after the headers (and any response body, if present) is
* fully consumed.
*/
void setIdleDuration(long duration, TimeUnit unit);
}