core/camel-api/src/main/java/org/apache/camel/spi/RouteController.java

/*
 * 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.TimeUnit;

import org.apache.camel.CamelContextAware;
import org.apache.camel.Route;
import org.apache.camel.ServiceStatus;
import org.apache.camel.StaticService;

/**
 * Controller for managing the lifecycle of all the {@link Route}'s.
 */
public interface RouteController extends CamelContextAware, StaticService {

    /**
     * Return the list of routes controlled by this controller.
     *
     * @return the list of controlled routes
     */
    Collection<Route> getControlledRoutes();

    /**
     * Starts all the routes which currently is not started.
     *
     * @throws Exception is thrown if a route could not be started for whatever reason
     */
    void startAllRoutes() throws Exception;

    /**
     * Indicates whether current thread is starting route(s).
     * <p/>
     * This can be useful to know by {@link LifecycleStrategy} or the likes, in case
     * they need to react differently.
     *
     * @return <tt>true</tt> if current thread is starting route(s), or <tt>false</tt> if not.
     */
    boolean isStartingRoutes();

    /**
     * Returns the current status of the given route
     *
     * @param routeId the route id
     * @return the status for the route
     */
    ServiceStatus getRouteStatus(String routeId);

    /**
     * Starts the given route if it has been previously stopped
     *
     * @param routeId the route id
     * @throws Exception is thrown if the route could not be started for whatever reason
     */
    void startRoute(String routeId) throws Exception;

    /**
     * Stops the given route using {@link org.apache.camel.spi.ShutdownStrategy}.
     *
     * @param routeId the route id
     * @throws Exception is thrown if the route could not be stopped for whatever reason
     * @see #suspendRoute(String)
     */
    void stopRoute(String routeId) throws Exception;

    /**
     * Stops the given route using {@link org.apache.camel.spi.ShutdownStrategy} with a specified timeout.
     *
     * @param routeId the route id
     * @param timeout  timeout
     * @param timeUnit the unit to use
     * @throws Exception is thrown if the route could not be stopped for whatever reason
     * @see #suspendRoute(String, long, java.util.concurrent.TimeUnit)
     */
    void stopRoute(String routeId, long timeout, TimeUnit timeUnit) throws Exception;

    /**
     * Stops the given route using {@link org.apache.camel.spi.ShutdownStrategy} with a specified timeout
     * and optional abortAfterTimeout mode.
     *
     * @param routeId the route id
     * @param timeout  timeout
     * @param timeUnit the unit to use
     * @param abortAfterTimeout should abort shutdown after timeout
     * @return <tt>true</tt> if the route is stopped before the timeout
     * @throws Exception is thrown if the route could not be stopped for whatever reason
     * @see #suspendRoute(String, long, java.util.concurrent.TimeUnit)
     */
    boolean stopRoute(String routeId, long timeout, TimeUnit timeUnit, boolean abortAfterTimeout) throws Exception;

    /**
     * Suspends the given route using {@link org.apache.camel.spi.ShutdownStrategy}.
     * <p/>
     * Suspending a route is more gently than stopping, as the route consumers will be suspended (if they support)
     * otherwise the consumers will be stopped.
     * <p/>
     * By suspending the route services will be kept running (if possible) and therefore its faster to resume the route.
     * <p/>
     * If the route does <b>not</b> support suspension the route will be stopped instead
     *
     * @param routeId the route id
     * @throws Exception is thrown if the route could not be suspended for whatever reason
     */
    void suspendRoute(String routeId) throws Exception;

    /**
     * Suspends the given route using {@link org.apache.camel.spi.ShutdownStrategy} with a specified timeout.
     * <p/>
     * Suspending a route is more gently than stopping, as the route consumers will be suspended (if they support)
     * otherwise the consumers will be stopped.
     * <p/>
     * By suspending the route services will be kept running (if possible) and therefore its faster to resume the route.
     * <p/>
     * If the route does <b>not</b> support suspension the route will be stopped instead
     *
     * @param routeId  the route id
     * @param timeout  timeout
     * @param timeUnit the unit to use
     * @throws Exception is thrown if the route could not be suspended for whatever reason
     */
    void suspendRoute(String routeId, long timeout, TimeUnit timeUnit) throws Exception;

    /**
     * Resumes the given route if it has been previously suspended
     * <p/>
     * If the route does <b>not</b> support suspension the route will be started instead
     *
     * @param routeId the route id
     * @throws Exception is thrown if the route could not be resumed for whatever reason
     */
    void resumeRoute(String routeId) throws Exception;

    /**
     * Access the underlying concrete RouteController implementation.
     *
     * @param clazz the proprietary class or interface of the underlying concrete RouteController.
     * @return an instance of the underlying concrete RouteController as the required type.
     */
    default <T extends RouteController> T unwrap(Class<T> clazz) {
        if (RouteController.class.isAssignableFrom(clazz)) {
            return clazz.cast(this);
        }

        throw new IllegalArgumentException(
            "Unable to unwrap this RouteController type (" + getClass() + ") to the required type (" + clazz + ")"
        );
    }
}