001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.spi;
018    
019    import org.apache.camel.Endpoint;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Service;
022    
023    /**
024     * @version $Revision: 830073 $
025     */
026    public interface InflightRepository extends Service {
027    
028        /**
029         * Adds the exchange to the inflight registry
030         *
031         * @param exchange  the exchange
032         */
033        void add(Exchange exchange);
034    
035        /**
036         * Removes the exchange from the inflight registry
037         *
038         * @param exchange  the exchange
039         */
040        void remove(Exchange exchange);
041    
042        /**
043         * Current size of inflight exchanges.
044         * <p/>
045         * Will return 0 if there are no inflight exchanges.
046         *
047         * @return number of exchanges currently in flight.
048         */
049        int size();
050    
051        /**
052         * Current size of inflight exchanges which are from the given endpoint.
053         * <p/>
054         * Will return 0 if there are no inflight exchanges.
055         *
056         * @param endpoint the endpoint where the {@link Exchange} are from.
057         * @return number of exchanges currently in flight.
058         */
059        int size(Endpoint endpoint);
060    
061    }