/*
* 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.beam.sdk.util.common;
import java.util.Iterator;
import java.util.Observable;
/**
* An abstract class used for iterators that notify observers about size in
* bytes of their elements, as they are being iterated over. The subclasses
* need to implement the standard Iterator interface and call method
* notifyValueReturned() for each element read and/or iterated over.
*
* @param <V> value type
*/
public abstract class ElementByteSizeObservableIterator<V>
extends Observable implements Iterator<V> {
protected final void notifyValueReturned(long byteSize) {
setChanged();
notifyObservers(byteSize);
}
}