01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: */
18: package org.apache.lenya.cms.observation;
19:
20: import org.apache.lenya.cms.publication.Document;
21:
22: /**
23: * Observation registry.
24: */
25: public interface ObservationRegistry extends RepositoryListener {
26:
27: /**
28: * The Avalon service role.
29: */
30: String ROLE = ObservationRegistry.class.getName();
31:
32: /**
33: * @param listener The listener.
34: * @param document The document to listen to.
35: * @throws ObservationException if the listener is already registered for this document.
36: */
37: void registerListener(RepositoryListener listener, Document document)
38: throws ObservationException;
39:
40: /**
41: * Registers a listener which is notified for all events.
42: * @param listener The listener.
43: * @throws ObservationException if the listener is already registered.
44: */
45: void registerListener(RepositoryListener listener)
46: throws ObservationException;
47:
48: }
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