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/**
 * Copyright 2013 Netflix, Inc.
 *
 * Licensed 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 com.netflix.nfsidecar.utils;

import java.util.concurrent.CancellationException;

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

public abstract class ExponentialRetryCallable extends RetryableCallable
{    
    public final static long MAX_SLEEP = 240000;
    public final static long MIN_SLEEP = 200;

    private static final Logger logger = LoggerFactory.getLogger(RetryableCallable.class);
    private long max;
    private long min;

    public ExponentialRetryCallable()
    {
        this.max = MAX_SLEEP;
        this.min = MIN_SLEEP;
    }

    public ExponentialRetryCallable(long minSleep, long maxSleep)
    {
        this.max = maxSleep;
        this.min = minSleep;
    }

    public T call() throws Exception
    {
        long delay = min;// ms
        while (true)
        {
            try
            {
                return retriableCall();
            }
            catch (CancellationException e)
            {
                throw e;
            }
            catch (Exception e)
            {                
                delay *= 2;
                if (delay > max)
                {
                    throw e;
                }
                logger.error(e.getMessage());
                Thread.sleep(delay);
            }
            finally
            {
                forEachExecution();
            }
        }
    }

}