| /* |
| * Copyright 1999-2004 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.tomcat.util.threads; |
| |
| |
| /** |
| * The reaper is a background thread with which ticks every minute |
| * and calls registered objects to allow reaping of old session |
| * data. |
| * |
| * @author James Duncan Davidson [duncan@eng.sun.com] |
| * @author Costin Manolache |
| */ |
| public class Reaper extends Thread { |
| |
| |
| private static org.apache.commons.logging.Log log= |
| org.apache.commons.logging.LogFactory.getLog(Reaper.class ); |
| |
| private boolean daemon = false; |
| |
| public Reaper() { |
| if (daemon) |
| this.setDaemon(true); |
| this.setName("TomcatReaper"); |
| } |
| |
| public Reaper(String name) { |
| if (daemon) |
| this.setDaemon(true); |
| this.setName(name); |
| } |
| |
| private long interval = 1000 * 60; //ms |
| |
| // XXX TODO Allow per/callback interval, find next, etc |
| // Right now the "interval" is used for all callbacks |
| // and it represent a sleep between runs. |
| |
| ThreadPoolRunnable cbacks[] = new ThreadPoolRunnable[30]; // XXX max |
| Object tdata[][] = new Object[30][]; // XXX max |
| int count = 0; |
| |
| /** Adding and removing callbacks is synchronized |
| */ |
| Object lock = new Object(); |
| static boolean running = true; |
| |
| // XXX Should be called 'interval' not defaultInterval |
| |
| public void setDefaultInterval(long t) { |
| interval = t; |
| } |
| |
| public long getDefaultIntervale() { |
| return interval; |
| } |
| |
| public int addCallback(ThreadPoolRunnable c, int interval) { |
| synchronized (lock) { |
| cbacks[count] = c; |
| count++; |
| return count - 1; |
| } |
| } |
| |
| public void removeCallback(int idx) { |
| synchronized (lock) { |
| count--; |
| cbacks[idx] = cbacks[count]; |
| cbacks[count] = null; |
| } |
| } |
| |
| public void startReaper() { |
| running = true; |
| this.start(); |
| } |
| |
| public synchronized void stopReaper() { |
| running = false; |
| if (log.isDebugEnabled()) |
| log.debug("Stop reaper "); |
| this.interrupt(); // notify() doesn't stop sleep |
| } |
| |
| public void run() { |
| while (running) { |
| if (!running) |
| break; |
| try { |
| Thread.sleep(interval); |
| } catch (InterruptedException ie) { |
| // sometimes will happen |
| } |
| |
| if (!running) |
| break; |
| for (int i = 0; i < count; i++) { |
| ThreadPoolRunnable callB = cbacks[i]; |
| // it may be null if a callback is removed. |
| // I think the code is correct |
| if (callB != null) { |
| callB.runIt(tdata[i]); |
| } |
| if (!running) |
| break; |
| } |
| } |
| } |
| } |