| /* |
| * 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.sling.installer.provider.jcr.impl; |
| |
| /** Used to wait at least SCAN_DELAY_MSEC before rescanning |
| * things after receiving a JCR Event. This avoids useless |
| * scanning, as events usually come in bursts. |
| */ |
| |
| class RescanTimer { |
| public static final long DEFAULT_SCAN_DELAY_MSEC = 500L; |
| private long nextScanTime = Long.MAX_VALUE; |
| private final long scanDelay; |
| |
| /** Create a timer with a non-default delay - this should ONLY |
| * be used in tests for now, as the existing code makes |
| * some assumptions about this. |
| * @param scanDelayMsec delay in msec |
| */ |
| RescanTimer(long scanDelayMsec) { |
| this.scanDelay = scanDelayMsec; |
| } |
| |
| /** Standard constructor for non-test code */ |
| RescanTimer() { |
| this(DEFAULT_SCAN_DELAY_MSEC); |
| } |
| |
| synchronized void scheduleScan() { |
| nextScanTime = System.currentTimeMillis() + scanDelay; |
| } |
| |
| synchronized void reset() { |
| nextScanTime = Long.MAX_VALUE; |
| } |
| |
| boolean expired() { |
| return System.currentTimeMillis() > nextScanTime; |
| } |
| } |