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/*
 * Copyright (c) 2014, Victor Nazarov 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Victor Nazarov nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.github.sviperll.tasks;

/**
 * This class allows to dynamically change behaviour of the task
 * 
 * #set method can be used to change current behaviour
 */
public class DelegatingTask implements TaskDefinition {
    private volatile TaskDefinition task;

    /**
     * 
     * @param task initial behaviour of new instance
     */
    public DelegatingTask(TaskDefinition task) {
        this.task = task;
    }

    /**
     * Creates new instance with "doing nothing" initial behaviour
     * @see Task#doNothing()
     */
    public DelegatingTask() {
        this(new DoNothingTask());
    }

    /**
     * Changes current behaviour to new passed as a parameter
     * 
     * @param task new behaviour
     */
    public void set(TaskDefinition task) {
        this.task = task;
    }

    /**
     * runs #signalKill method of current behaviour, @see TaskDefinition#signalKill
     */
    @Override
    public void signalKill() {
        task.signalKill();
    }

    /**
     * runs #perform method of current behaviour, @see TaskDefinition#perform
     */
    @Override
    public void perform() {
        task.perform();
    }

    /**
     * runs #cleanup method of current behaviour, @see TaskDefinition#cleanup
     */
    @Override
    public void cleanup() {
        task.cleanup();
    }
}