oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/index/progress/SimpleRateEstimator.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.jackrabbit.oak.plugins.index.progress;

import java.util.concurrent.TimeUnit;

import com.google.common.base.Stopwatch;

public class SimpleRateEstimator implements TraversalRateEstimator {
    private final Stopwatch w = Stopwatch.createStarted();
    private long count;

    @Override
    public void traversedNode() {
        count++;
    }

    @Override
    public double getNodesTraversedPerSecond() {
        return (double) count / w.elapsed(TimeUnit.SECONDS);
    }
}