| /** |
| * 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 org.apache.camel.ShutdownRunningTask; |
| |
| /** |
| * Allows {@link org.apache.camel.Consumer} to fine grained control on shutdown which mostly |
| * have to cater for in-memory based components. These components need to be able to have an extra |
| * chance to have their pending exchanges being completed to support graceful shutdown. This helps |
| * ensure that no messages get lost. |
| * |
| * @version |
| * @see org.apache.camel.spi.ShutdownStrategy |
| */ |
| public interface ShutdownAware { |
| |
| /** |
| * To defer shutdown during first phase of shutdown. This allows any pending exchanges to be completed |
| * and therefore ensure a graceful shutdown without loosing messages. At the very end when there are no |
| * more inflight and pending messages the consumer could then safely be shutdown. |
| * <p/> |
| * This is needed by {@link org.apache.camel.component.seda.SedaConsumer}. |
| * |
| * @param shutdownRunningTask the configured option for how to act when shutting down running tasks. |
| * @return <tt>true</tt> to defer shutdown to very last. |
| */ |
| boolean deferShutdown(ShutdownRunningTask shutdownRunningTask); |
| |
| /** |
| * Gets the number of pending exchanges. |
| * <p/> |
| * Some consumers has internal queues with {@link org.apache.camel.Exchange} which are pending. |
| * For example the {@link org.apache.camel.component.seda.SedaConsumer}. |
| * <p/> |
| * Return <tt>zero</tt> to indicate no pending exchanges and therefore ready to shutdown. |
| * |
| * @return number of pending exchanges |
| */ |
| int getPendingExchangesSize(); |
| |
| /** |
| * Prepares the consumer for shutdown. |
| * <p/> |
| * For example by graceful stopping any threads or the likes. |
| */ |
| void prepareShutdown(); |
| } |