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The Core Camel Java DSL based router
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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 java.util.concurrent.ThreadPoolExecutor;

import org.apache.camel.CamelContext;
import org.apache.camel.Component;
import org.apache.camel.Endpoint;
import org.apache.camel.ErrorHandlerFactory;
import org.apache.camel.Processor;
import org.apache.camel.Route;
import org.apache.camel.Service;
import org.apache.camel.VetoCamelContextStartException;

/**
 * Strategy for lifecycle notifications.
 */
public interface LifecycleStrategy {

    /**
     * Notification on starting a {@link CamelContext}.
     *
     * @param context the camel context
     * @throws VetoCamelContextStartException can be thrown to veto starting {@link CamelContext}.
     *                                        Any other runtime exceptions will be logged at WARN level by Camel will continue starting itself.
     */
    void onContextStart(CamelContext context) throws VetoCamelContextStartException;

    /**
     * Notification on stopping a {@link CamelContext}.
     *
     * @param context the camel context
     */
    void onContextStop(CamelContext context);

    /**
     * Notification on adding an {@link org.apache.camel.Component}.
     *
     * @param name      the unique name of this component
     * @param component the added component
     */
    void onComponentAdd(String name, Component component);

    /**
     * Notification on removing an {@link org.apache.camel.Component}.
     *
     * @param name      the unique name of this component
     * @param component the removed component
     */
    void onComponentRemove(String name, Component component);

    /**
     * Notification on adding an {@link Endpoint}.
     *
     * @param endpoint the added endpoint
     */
    void onEndpointAdd(Endpoint endpoint);

    /**
     * Notification on removing an {@link Endpoint}.
     *
     * @param endpoint the removed endpoint
     */
    void onEndpointRemove(Endpoint endpoint);

    /**
     * Notification on adding a {@link Service}.
     *
     * @param context the camel context
     * @param service the added service
     * @param route   the route the service belongs to if any possible to determine
     */
    void onServiceAdd(CamelContext context, Service service, Route route);

    /**
     * Notification on removing a {@link Service}.
     *
     * @param context the camel context
     * @param service the removed service
     * @param route   the route the service belongs to if any possible to determine
     */
    void onServiceRemove(CamelContext context, Service service, Route route);

    /**
     * Notification on adding {@link Route}(s).
     *
     * @param routes the added routes
     */
    void onRoutesAdd(Collection routes);

    /**
     * Notification on removing {@link Route}(s).
     *
     * @param routes the removed routes
     */
    void onRoutesRemove(Collection routes);

    /**
     * Notification on adding {@link RouteContext}(s).
     *
     * @param routeContext the added route context
     */
    void onRouteContextCreate(RouteContext routeContext);

    /**
     * Notification on adding error handler.
     *
     * @param routeContext        the added route context
     * @param errorHandler        the error handler
     * @param errorHandlerBuilder the error handler builder
     */
    void onErrorHandlerAdd(RouteContext routeContext, Processor errorHandler, ErrorHandlerFactory errorHandlerBuilder);

    /**
     * Notification on removing error handler.
     *
     * @param routeContext        the removed route context
     * @param errorHandler        the error handler
     * @param errorHandlerBuilder the error handler builder
     */
    void onErrorHandlerRemove(RouteContext routeContext, Processor errorHandler, ErrorHandlerFactory errorHandlerBuilder);

    /**
     * Notification on adding a thread pool.
     *
     * @param camelContext        the camel context
     * @param threadPool          the thread pool
     * @param id                  id of the thread pool (can be null in special cases)
     * @param sourceId            id of the source creating the thread pool (can be null in special cases)
     * @param routeId             id of the route for the source (is null if no source)
     * @param threadPoolProfileId id of the thread pool profile, if used for creating this thread pool (can be null)
     */
    void onThreadPoolAdd(CamelContext camelContext, ThreadPoolExecutor threadPool, String id,
                         String sourceId, String routeId, String threadPoolProfileId);

    /**
     * Notification on removing a thread pool.
     *
     * @param camelContext the camel context
     * @param threadPool   the thread pool
     */
    void onThreadPoolRemove(CamelContext camelContext, ThreadPoolExecutor threadPool);

}