Profiler.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.zookeeper.server.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Profiler {
    private static final Logger LOG = LoggerFactory.getLogger(Profiler.class);

    public interface Operation<T> {
        public T execute() throws Exception;
    }

    public static <T> T profile(Operation<T> op, long timeout, String message)
            throws Exception {
        long start = System.currentTimeMillis();
        T res = op.execute();
        long end = System.currentTimeMillis();
        if (end - start > timeout) {
            LOG.info("Elapsed "+(end - start) + " ms: " + message);
        }
        return res;
    }
}