| 1 | /** |
| 2 | * Copyright 2005-2011 Steve McDuff d-duff@users.sourceforge.net |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.deduced.viewer.web.server; |
| 17 | |
| 18 | import java.util.Collections; |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.apache.commons.collections.list.TreeList; |
| 22 | import org.deduced.PropertyChangeEvent; |
| 23 | import org.deduced.PropertyListener; |
| 24 | import org.deduced.viewer.web.serializer.MasterWebSerializer; |
| 25 | import org.deduced.viewer.web.shared.ChangeEvent; |
| 26 | |
| 27 | /** |
| 28 | * |
| 29 | * SerializedChangeEventAggregator is used to listen to change events and |
| 30 | * aggregate them in a list of serialized change events. |
| 31 | * |
| 32 | * @author Steve McDuff |
| 33 | */ |
| 34 | public class SerializedChangeEventAggregator implements |
| 35 | PropertyListener<Object, Object> |
| 36 | { |
| 37 | |
| 38 | /** |
| 39 | * monitored change event list |
| 40 | */ |
| 41 | @SuppressWarnings("unchecked") |
| 42 | private List<ChangeEvent> changeEventList = Collections |
| 43 | .synchronizedList(new TreeList()); |
| 44 | |
| 45 | /** |
| 46 | * serializer to use |
| 47 | */ |
| 48 | private MasterWebSerializer serializer = null; |
| 49 | |
| 50 | /** |
| 51 | * get Serializer |
| 52 | * |
| 53 | * @return the serializer to use |
| 54 | */ |
| 55 | public MasterWebSerializer getSerializer() |
| 56 | { |
| 57 | return serializer; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * set Serializer |
| 62 | * |
| 63 | * @param setSerializer the new serializer to use |
| 64 | */ |
| 65 | public void setSerializer( |
| 66 | MasterWebSerializer setSerializer) |
| 67 | { |
| 68 | serializer = setSerializer; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * get the Change Event List. The list is synchronized so it is multi-thread |
| 73 | * safe. The caller can also modify the list as desired. A common usage is |
| 74 | * to purge the list of pending events. |
| 75 | * |
| 76 | * @return the change event list |
| 77 | */ |
| 78 | public List<ChangeEvent> getChangeEventList() |
| 79 | { |
| 80 | return changeEventList; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * (non-JSDoc) |
| 85 | * |
| 86 | * @see org.deduced.PropertyListener#propertyChanged(org.deduced.PropertyChangeEvent) |
| 87 | */ |
| 88 | @Override |
| 89 | public void propertyChanged( |
| 90 | PropertyChangeEvent<? extends Object, ? extends Object> event) |
| 91 | { |
| 92 | // uncomment to log all captured change events. |
| 93 | // System.out.println(event.toString()); |
| 94 | ChangeEvent serializedChangeEvent = |
| 95 | serializer.serializeChangeEvent(event); |
| 96 | changeEventList.add(serializedChangeEvent); |
| 97 | } |
| 98 | |
| 99 | } |