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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 purpose of an HTTP connection manager is to serve as a factory for new
* HTTP connections, manage persistent connections and synchronize access to
* persistent connections making sure that only one thread of execution can
* have access to a connection at a time.
*
*
* Implementations of this interface must be thread-safe. Access to shared
* data must be synchronized as methods of this interface may be executed
* from multiple threads.
*
*
* @since 4.3
*/
public interface HttpClientConnectionManager extends ModalCloseable {
/**
* Returns a {@link LeaseRequest} object which can be used to obtain
* a {@link ConnectionEndpoint} to cancel the request by calling
* {@link LeaseRequest#cancel()}.
*
* Please note that newly allocated endpoints can be leased
* {@link ConnectionEndpoint#isConnected() disconnected}. The consumer of the endpoint
* is responsible for fully establishing the route to the endpoint target
* by calling {@link #connect(ConnectionEndpoint, TimeValue, HttpContext)}
* in order to connect directly to the target or to the first proxy hop,
* and optionally calling {@link #upgrade(ConnectionEndpoint, HttpContext)} method
* to upgrade the underlying transport to Transport Layer Security after having
* executed a {@code CONNECT} method to all intermediate proxy hops.
*
* @param id unique operation ID or {@code null}.
* @param route HTTP route of the requested connection.
* @param requestTimeout lease request timeout.
* @param state expected state of the connection or {@code null}
* if the connection is not expected to carry any state.
* @since 5.0
*/
LeaseRequest lease(String id, HttpRoute route, Timeout requestTimeout, Object state);
/**
* Releases the endpoint back to the manager making it potentially
* re-usable by other consumers. Optionally, the maximum period
* of how long the manager should keep the connection alive can be
* defined using {@code validDuration} and {@code timeUnit}
* parameters.
*
* @param endpoint the managed endpoint.
* @param newState the new connection state of {@code null} if state-less.
* @param validDuration the duration of time this connection is valid for reuse.
*/
void release(ConnectionEndpoint endpoint, Object newState, TimeValue validDuration);
/**
* Connects the endpoint to the initial hop (connection target in case
* of a direct route or to the first proxy hop in case of a route via a proxy
* or multiple proxies).
*
* @param endpoint the managed endpoint.
* @param connectTimeout connect timeout.
* @param context the actual HTTP context.
*/
void connect(ConnectionEndpoint endpoint, TimeValue connectTimeout, HttpContext context) throws IOException;
/**
* Upgrades transport security of the given endpoint by using the TLS security protocol.
*
* @param endpoint the managed endpoint.
* @param context the actual HTTP context.
*/
void upgrade(ConnectionEndpoint endpoint, HttpContext context) throws IOException;
}