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/**
 * Copyright (C) 2010 Daniel Manzke 
 *
 * 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.
 */
//
// JODConverter - Java OpenDocument Converter
// Copyright 2009 Art of Solving Ltd
// Copyright 2004-2009 Mirko Nasato
//
// JODConverter is free software: you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// JODConverter is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General
// Public License along with JODConverter.  If not, see
// .
//
package org.artofsolving.jodconverter.office;

abstract class Retryable {

    /**
     * @throws TemporaryException for an error condition that can be temporary - i.e. retrying later could be successful
     * @throws Exception for all other error conditions
     */
    protected abstract void attempt() throws TemporaryException, Exception;

    public void execute(long interval, long timeout) throws RetryTimeoutException, Exception {
        execute(0L, interval, timeout);
    }

    public void execute(long delay, long interval, long timeout) throws RetryTimeoutException, Exception {
        long start = System.currentTimeMillis();
        if (delay > 0L) {
            sleep(delay);
        }
        while (true) {
            try {
                attempt();
                return;
            } catch (TemporaryException temporaryException) {
                if (System.currentTimeMillis() - start < timeout) {
                    sleep(interval);
                    // continue
                } else {
                    throw new RetryTimeoutException(temporaryException.getCause());
                }
            }
        }
    }

    private void sleep(long millis) {
        try {
            Thread.sleep(millis);
        } catch (InterruptedException interruptedException) {
            // continue
        }
    }

}