| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hiveutils.service.impl; |
| 16 | |
| 17 | import java.util.Iterator; |
| 18 | import java.util.List; |
| 19 | import java.util.SortedSet; |
| 20 | import java.util.TreeSet; |
| 21 | |
| 22 | import org.apache.commons.logging.Log; |
| 23 | import org.apache.commons.logging.LogFactory; |
| 24 | import org.apache.hivemind.ShutdownCoordinator; |
| 25 | import org.apache.hivemind.events.RegistryShutdownListener; |
| 26 | |
| 27 | public final class ShutdownCoordinatorImpl implements ShutdownCoordinator |
| 28 | { |
| 29 | static private final Log _logger = LogFactory.getLog(ShutdownCoordinatorImpl.class); |
| 30 | |
| 31 | public ShutdownCoordinatorImpl(int defaultPriority, List<ShutdownContribution> priorities) |
| 32 | { |
| 33 | _priorities = priorities; |
| 34 | _defaultPriority = defaultPriority; |
| 35 | _listeners = new TreeSet<ShutdownListener>(); |
| 36 | } |
| 37 | |
| 38 | public synchronized void addRegistryShutdownListener(RegistryShutdownListener l) |
| 39 | { |
| 40 | _logger.debug("addRegistryShutdownListener() " + l); |
| 41 | // Check this listener is not already registered |
| 42 | for (ShutdownListener listener: _listeners) |
| 43 | { |
| 44 | if (listener.getListener() == l) |
| 45 | { |
| 46 | _logger.debug("addRegistryShutdownListener() already registered"); |
| 47 | return; |
| 48 | } |
| 49 | } |
| 50 | // OK, find whether it has a contribution with priority |
| 51 | int priority = _defaultPriority; |
| 52 | for (ShutdownContribution contrib: _priorities) |
| 53 | { |
| 54 | if (contrib.getNameIsClass()) |
| 55 | { |
| 56 | if (l.getClass().getName().equals(contrib.getName())) |
| 57 | { |
| 58 | priority = contrib.getPriority(); |
| 59 | break; |
| 60 | } |
| 61 | } |
| 62 | else |
| 63 | { |
| 64 | if (l.toString().equals(contrib.getName())) |
| 65 | { |
| 66 | priority = contrib.getPriority(); |
| 67 | break; |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | _logger.debug("addRegistryShutdownListener() priority=" + priority); |
| 72 | |
| 73 | // Add it to the list of listeners |
| 74 | _listeners.add(new ShutdownListener(l, priority)); |
| 75 | } |
| 76 | |
| 77 | public synchronized void removeRegistryShutdownListener(RegistryShutdownListener l) |
| 78 | { |
| 79 | _logger.debug("removeRegistryShutdownListener() " + l); |
| 80 | Iterator<ShutdownListener> i = _listeners.iterator(); |
| 81 | while (i.hasNext()) |
| 82 | { |
| 83 | if (i.next().getListener() == l) |
| 84 | { |
| 85 | i.remove(); |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | public synchronized void shutdown() |
| 92 | { |
| 93 | _logger.debug("shutdown()"); |
| 94 | for (ShutdownListener listener: _listeners) |
| 95 | { |
| 96 | listener.getListener().registryDidShutdown(); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | static private class ShutdownListener implements Comparable<ShutdownListener> |
| 101 | { |
| 102 | public ShutdownListener(RegistryShutdownListener listener, int priority) |
| 103 | { |
| 104 | _listener = listener; |
| 105 | _priority = priority; |
| 106 | _order = ++_count; |
| 107 | } |
| 108 | |
| 109 | public RegistryShutdownListener getListener() |
| 110 | { |
| 111 | return _listener; |
| 112 | } |
| 113 | |
| 114 | public int compareTo(ShutdownListener that) |
| 115 | { |
| 116 | int diff = this._priority - that._priority; |
| 117 | if (diff != 0) |
| 118 | { |
| 119 | return diff; |
| 120 | } |
| 121 | else |
| 122 | { |
| 123 | return this._order - that._order; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | private final RegistryShutdownListener _listener; |
| 128 | private final int _priority; |
| 129 | private final int _order; |
| 130 | static private int _count = 0; |
| 131 | } |
| 132 | |
| 133 | private final int _defaultPriority; |
| 134 | private final List<ShutdownContribution> _priorities; |
| 135 | private final SortedSet<ShutdownListener> _listeners; |
| 136 | } |