| /* |
| * Copyright 2005 The Apache Software Foundation. |
| * |
| * Licensed 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.cocoon.components.source.impl.validity; |
| |
| import org.apache.excalibur.source.SourceValidity; |
| |
| /** |
| * Delays validity check for a specified interval. |
| * |
| * <p> |
| * This is wrapper validity which can be used to reduce count of |
| * filesystem (or network) accesses just to check the source |
| * validity. |
| * |
| * @since 2.1.8 |
| * @version $Id$ |
| */ |
| public class DelayedValidity implements SourceValidity { |
| |
| private long delay; |
| private long expires; |
| |
| private SourceValidity delegate; |
| |
| |
| public DelayedValidity(long delay, SourceValidity validity) { |
| this.delay = delay; |
| this.expires = System.currentTimeMillis() + delay; |
| this.delegate = validity; |
| } |
| |
| public int isValid() { |
| final long currentTime = System.currentTimeMillis(); |
| if (currentTime <= this.expires) { |
| // The delay has not passed yet - assuming source is valid. |
| return SourceValidity.VALID; |
| } |
| |
| // The delay has passed, prepare for the next interval. |
| this.expires = currentTime + this.delay; |
| |
| return this.delegate.isValid(); |
| } |
| |
| public int isValid(SourceValidity newValidity) { |
| // Always delegate |
| return this.delegate.isValid(newValidity); |
| } |
| } |