/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/ManagedClientConnection.java $
* $Revision: 672969 $
* $Date: 2008-06-30 18:09:50 -0700 (Mon, 30 Jun 2008) $
*
* ====================================================================
* 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
* <http://www.apache.org/>.
*
*/
package org.apache.http.conn;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.SSLSession;
import org.apache.http.HttpClientConnection;
import org.apache.http.HttpInetConnection;
import org.apache.http.HttpHost;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.conn.routing.HttpRoute;
/**
* A client-side connection with advanced connection logic.
* Instances are typically obtained from a connection manager.
*
* @author <a href="mailto:rolandw at apache.org">Roland Weber</a>
*
*
* <!-- empty lines to avoid svn diff problems -->
* @version $Revision: 672969 $
*
* @since 4.0
*/
public interface ManagedClientConnection extends
HttpClientConnection, HttpInetConnection, ConnectionReleaseTrigger {
/**
* 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.
*
* @return <code>true</code> if this connection is secure,
* <code>false</code> otherwise
*/
boolean isSecure()
;
/**
* Obtains the current route of this connection.
*
* @return the route established so far, or
* <code>null</code> if not connected
*/
HttpRoute getRoute()
;
/**
* Obtains the SSL session of the underlying connection, if any.
* If this connection is open, and the underlying socket is an
* {@link javax.net.ssl.SSLSocket SSLSocket}, the SSL session of
* that socket is obtained. This is a potentially blocking operation.
* <br/>
* <b>Note:</b> 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</code> otherwise
*/
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.
* <br/>
* <b>Note:</b> 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</code> if the tunnel should be considered
* secure, <code>false</code> 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 <i>proxy chains</i>, 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 <i>not</i> the proxy <i>through</i> which
* the tunnel was established, but the new end point
* of the tunnel. The tunnel does <i>not</i> yet
* reach to the target, use {@link #tunnelTarget}
* to indicate an end-to-end tunnel.
* @param secure <code>true</code> if the connection should be
* considered secure, <code>false</code> 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 it's 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.
* <br/>
* 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 it's reuse. Reasons for preventing reuse include
* error conditions and the evaluation of a
* {@link org.apache.http.ConnectionReuseStrategy reuse strategy}.
* <br/>
* <b>Note:</b>
* It is <i>not</i> 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</code> if this connection is marked as being in
* a reusable communication state,
* <code>false</code> 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);
} // interface ManagedClientConnection
|
