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/*
* Fabric3
* Copyright (c) 2009-2013 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 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 General Public License for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
* If not, see .
*/
package org.fabric3.implementation.timer.runtime;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.oasisopen.sca.ServiceRuntimeException;

import org.fabric3.timer.spi.Task;

/**
 * A {@link Task} implementation that returns the next firing interval by calling a nextInterval method on a specialized interval class.
 */
public class IntervalClassTask implements Task {
    private Method method;
    private Object interval;
    private Runnable delegate;

    public IntervalClassTask(Object interval, Runnable delegate) throws NoSuchMethodException {
        this.method = interval.getClass().getMethod("nextInterval");
        this.interval = interval;
        this.delegate = delegate;
    }

    public long nextInterval() {
        try {
            if (method == null) {
                // the interval class was invalid
                return Task.DONE;
            }
            return (Long) method.invoke(interval);
        } catch (ClassCastException e) {
            throw new ServiceRuntimeException("Invalid interval type returned", e);
        } catch (IllegalAccessException e) {
            throw new ServiceRuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new ServiceRuntimeException(e);
        }
    }

    public void run() {
        delegate.run();
    }
}