org.refcodes.component.Resumable Maven / Gradle / Ivy

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// /////////////////////////////////////////////////////////////////////////////
// REFCODES.ORG
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// This code is copyright (c) by Siegfried Steiner, Munich, Germany and licensed
// under the following (see "http://en.wikipedia.org/wiki/Multi-licensing")
// licenses:
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// GNU General Public License, v3.0 ("http://www.gnu.org/licenses/gpl-3.0.html")
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package org.refcodes.component;

/**
 * This mixin might be implemented by a component in order to provide resume
 * facilities.
 */
public interface Resumable {

	/**
	 * Resumes the component.
	 * 
	 * @throws ResumeException Thrown in case resuming fails.
	 */
	void resume() throws ResumeException;

	/**
	 * The {@link ResumeAutomaton} interface defines those methods related to
	 * the resume life-cycle.
	 */
	public interface ResumeAutomaton extends Resumable, RunningAccessor {

		/**
		 * Determines whether the component may get resumed.
		 * 
		 * @return True if {@link #resume()} is possible.
		 */
		boolean isResumable();
	}

	/**
	 * To enable the {@link Resumable} functionality to be invoked in a builder
	 * chain.
	 *
	 * @param  The instance to be returned on which to apply succeeding
	 *        builder operations.
	 */
	public interface ResumeBuilder> {

		/**
		 * Builder method for the {@link Resumable#resume()} method.
		 * 
		 * @return The instance to be returned on which to apply succeeding
		 *         builder operations.
		 * 
		 * @throws ResumeException Thrown in case resuming fails.
		 */
		B withResume() throws ResumeException;
	}

	/**
	 * See {@link Resumable} without any checked exception being declared.
	 */
	public interface UncheckedResumable extends Resumable {

		/**
		 * See {@link Resumable#resume()} without any checked exception being
		 * declared.
		 */
		void resume();
	}
}