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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
 * .
 *
 */
package org.apache.hc.core5.pool;

import java.util.concurrent.Future;

import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.io.ModalCloseable;
import org.apache.hc.core5.util.Timeout;

/**
 * {@code ConnPool} represents a shared pool connections can be leased from
 * and released back to.
 *
 * @param  the route type that represents the opposite endpoint of a pooled
 *   connection.
 * @param  the type of pooled connections.
 * @since 4.2
 */
public interface ConnPool {

    /**
     * Attempts to lease a connection for the given route and with the given
     * state from the pool.
     * 

* Please note the connection request can get automatically cancelled by the pool * in case of a request timeout. * * @param route route of the connection. * @param state arbitrary object that represents a particular state * (usually a security principal or a unique token identifying * the user whose credentials have been used while establishing the connection). * May be {@code null}. * @param requestTimeout request timeout. In case of a timeout the request * can get automatically cancelled by the pool. * @param callback operation completion callback. * * @return future for a leased pool entry. */ Future> lease(T route, Object state, Timeout requestTimeout, FutureCallback> callback); /** * Releases the pool entry back to the pool. * * @param entry pool entry leased from the pool * @param reusable flag indicating whether or not the released connection * is in a consistent state and is safe for further use. */ void release(PoolEntry entry, boolean reusable); }





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