| /** |
| * 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.processor; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Expression; |
| import org.apache.camel.Processor; |
| |
| /** |
| * A <a href="http://camel.apache.org/delayer.html">Delayer</a> which |
| * delays processing the exchange until the correct amount of time has elapsed |
| * using an expression to determine the delivery time. |
| * |
| * @version $Revision$ |
| */ |
| public class Delayer extends DelayProcessorSupport { |
| private final Expression delay; |
| |
| public Delayer(Processor processor, Expression delay) { |
| super(processor); |
| this.delay = delay; |
| } |
| |
| @Override |
| public String toString() { |
| return "Delayer[" + delay + " to: " + getProcessor() + "]"; |
| } |
| |
| // Implementation methods |
| // ------------------------------------------------------------------------- |
| |
| /** |
| * Waits for an optional time period before continuing to process the |
| * exchange |
| */ |
| protected void delay(Exchange exchange) throws Exception { |
| long time = 0; |
| if (delay != null) { |
| Long longValue = delay.evaluate(exchange, Long.class); |
| if (longValue != null) { |
| time = longValue; |
| } |
| } |
| if (time <= 0) { |
| // no delay |
| return; |
| } |
| |
| // now add the current time |
| time += defaultProcessTime(exchange); |
| |
| waitUntil(time, exchange); |
| } |
| |
| /** |
| * A Strategy Method to allow derived implementations to decide the current |
| * system time or some other default exchange property |
| */ |
| protected long defaultProcessTime(Exchange exchange) { |
| return currentSystemTime(); |
| } |
| |
| } |