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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.
 */
package org.apache.camel.spi;

import java.util.Collection;

import org.apache.camel.Exchange;
import org.apache.camel.StaticService;

/**
 * A repository which tracks in flight {@link Exchange}s.
 */
public interface InflightRepository extends StaticService {

    /**
     * Information about the inflight exchange.
     */
    interface InflightExchange {

        /**
         * The exchange being inflight
         */
        Exchange getExchange();

        /**
         * The duration in millis the exchange has been inflight
         */
        long getDuration();

        /**
         * The elapsed time in millis processing the exchange at the current node
         */
        long getElapsed();

        /**
         * The id of the node from the route where the exchange currently is being processed
         * 
         * Is null if message history is disabled.
         */
        String getNodeId();

        /**
         * The id of the route where the exchange originates (started)
         */
        String getFromRouteId();

        /**
         * Whether the endpoint is remote where the exchange originates (started)
         */
        boolean isFromRemoteEndpoint();

        /**
         * The id of the route where the exchange currently is being processed
         * 

         * Is null if message history is disabled.
         */
        String getAtRouteId();

    }

    /**
     * Adds the exchange to the inflight registry to the total counter
     *
     * @param exchange the exchange
     */
    void add(Exchange exchange);

    /**
     * Removes the exchange from the inflight registry to the total counter
     *
     * @param exchange the exchange
     */
    void remove(Exchange exchange);

    /**
     * Adds the exchange to the inflight registry associated to the given route
     *
     * @param exchange the exchange
     * @param routeId  the id of the route
     */
    void add(Exchange exchange, String routeId);

    /**
     * Removes the exchange from the inflight registry removing association to the given route
     *
     * @param exchange the exchange
     * @param routeId  the id of the route
     */
    void remove(Exchange exchange, String routeId);

    /**
     * Current size of inflight exchanges.
     * 

     * Will return 0 if there are no inflight exchanges.
     *
     * @return number of exchanges currently in flight.
     */
    int size();

    /**
     * Adds the route from the in flight registry.
     * 

     * Is used for initializing up resources
     *
     * @param routeId the id of the route
     */
    void addRoute(String routeId);

    /**
     * Removes the route from the in flight registry.
     * 

     * Is used for cleaning up resources to avoid leaking.
     *
     * @param routeId the id of the route
     */
    void removeRoute(String routeId);

    /**
     * Current size of inflight exchanges which are from the given route.
     * 
     * Will return 0 if there are no inflight exchanges.
     *
     * @param  routeId the id of the route
     * @return         number of exchanges currently in flight.
     */
    int size(String routeId);

    /**
     * Whether the inflight repository should allow browsing each inflight exchange.
     *
     * This is by default disabled as there is a very slight performance overhead when enabled.
     */
    boolean isInflightBrowseEnabled();

    /**
     * Whether the inflight repository should allow browsing each inflight exchange.
     *
     * This is by default disabled as there is a very slight performance overhead when enabled.
     *
     * @param inflightBrowseEnabled whether browsing is enabled
     */
    void setInflightBrowseEnabled(boolean inflightBrowseEnabled);

    /**
     * A read-only browser of the {@link InflightExchange}s that are currently inflight.
     */
    Collection browse();

    /**
     * A read-only browser of the {@link InflightExchange}s that are currently inflight that started from the
     * given route.
     *
     * @param fromRouteId the route id, or null for all routes.
     */
    Collection browse(String fromRouteId);

    /**
     * A read-only browser of the {@link InflightExchange}s that are currently inflight.
     *
     * @param limit                 maximum number of entries to return
     * @param sortByLongestDuration to sort by the longest duration. Set to true to include the exchanges that
     *                              has been inflight the longest time, set to false to sort by exchange id
     */
    Collection browse(int limit, boolean sortByLongestDuration);

    /**
     * A read-only browser of the {@link InflightExchange}s that are currently inflight that started from the
     * given route.
     *
     * @param fromRouteId           the route id, or null for all routes.
     * @param limit                 maximum number of entries to return
     * @param sortByLongestDuration to sort by the longest duration. Set to true to include the exchanges that
     *                              has been inflight the longest time, set to false to sort by exchange id
     */
    Collection browse(String fromRouteId, int limit, boolean sortByLongestDuration);

    /**
     * Gets the oldest {@link InflightExchange} that are currently inflight that started from the given route.
     *
     * @param  fromRouteId the route id, or null for all routes.
     * @return             the oldest, or null if none inflight
     */
    InflightExchange oldest(String fromRouteId);

}