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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.http.impl.conn.tsccm;

import java.util.concurrent.TimeUnit;

import org.apache.http.conn.ConnectionPoolTimeoutException;

/**
 * Encapsulates a request for a {@link BasicPoolEntry}.
 *
 * @since 4.0
 */
public interface PoolEntryRequest {

    /**
     * Obtains a pool entry with a connection within the given timeout.
     * If {@link #abortRequest()} is called before this completes
     * an {@link InterruptedException} is thrown.
     *
     * @param timeout   the timeout, 0 or negative for no timeout
     * @param tunit     the unit for the timeout,
     *                  may be null only if there is no timeout
     *
     * @return  pool entry holding a connection for the route
     *
     * @throws ConnectionPoolTimeoutException
     *         if the timeout expired
     * @throws InterruptedException
     *         if the calling thread was interrupted or the request was aborted
     */
    BasicPoolEntry getPoolEntry(
            long timeout,
            TimeUnit tunit) throws InterruptedException, ConnectionPoolTimeoutException;

    /**
     * Aborts the active or next call to
     * {@link #getPoolEntry(long, TimeUnit)}.
     */
    void abortRequest();

}