| /* |
| * 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.jackrabbit.oak.spi.commit; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| import static com.google.common.collect.Sets.newIdentityHashSet; |
| |
| import java.util.Set; |
| |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * Composite observer that delegates all content changes to the set of |
| * currently registered component observers. |
| */ |
| public class CompositeObserver implements Observer { |
| |
| private final Set<Observer> observers = newIdentityHashSet(); |
| |
| public synchronized void addObserver(@NotNull Observer observer) { |
| checkState(observers.add(checkNotNull(observer))); |
| } |
| |
| public synchronized void removeObserver(@NotNull Observer observer) { |
| checkState(observers.remove(checkNotNull(observer))); |
| } |
| |
| //----------------------------------------------------------< Observer >-- |
| |
| @Override |
| public synchronized void contentChanged( |
| @NotNull NodeState root, @NotNull CommitInfo info) { |
| checkNotNull(root); |
| for (Observer observer : observers) { |
| observer.contentChanged(root, info); |
| } |
| } |
| |
| //------------------------------------------------------------< Object >-- |
| |
| @Override |
| public synchronized String toString() { |
| return observers.toString(); |
| } |
| |
| } |