cassandra-trunk/src/java/org/apache/cassandra/utils/progress/ProgressEventNotifierSupport.java
/*
 * 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.cassandra.utils.progress;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Provides basic, thread safe ProgressEvent notification support
 */
public abstract class ProgressEventNotifierSupport implements ProgressEventNotifier
{
    private List<ProgressListener> listeners = new CopyOnWriteArrayList<>();

    @Override
    public void addProgressListener(ProgressListener listener)
    {
        listeners.add(listener);
    }

    @Override
    public void removeProgressListener(ProgressListener listener)
    {
        listeners.remove(listener);
    }

    protected void fireProgressEvent(String tag, ProgressEvent event)
    {
        for (ProgressListener listener : listeners)
        {
            listener.progress(tag, event);
        }
    }
}
