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/*******************************************************************************
 * Copyright 2011 Netflix
 *
 * 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.dyno.connectionpool.impl;

import java.util.concurrent.atomic.AtomicInteger;

import com.netflix.dyno.connectionpool.RetryPolicy;

/**
 * Simple impl that allows at most one attempt which essentially mean no retries.
 *
 * @author poberai
 */
public class RunOnce implements RetryPolicy {

    private AtomicInteger attempts = new AtomicInteger(0);

    @Override
    public void begin() {
    }

    @Override
    public void success() {
        attempts.incrementAndGet();
    }

    @Override
    public void failure(Exception e) {
        attempts.incrementAndGet();
    }

    @Override
    public boolean allowRetry() {
        return attempts.get() == 0;
    }

    @Override
    public int getAttemptCount() {
        return attempts.get() > 0 ? 1 : 0;
    }

    public static class RetryFactory implements RetryPolicyFactory {

        @Override
        public RetryPolicy getRetryPolicy() {
            return new RunOnce();
        }
    }

    @Override
    public boolean allowCrossZoneFallback() {
        return false;
    }

    @Override
    public String toString() {
        return "RunOnce";
    }
}