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Artifact for breaking up dependencies between components or modules of a software system (dependency injection and inversion of control).

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// /////////////////////////////////////////////////////////////////////////////
// REFCODES.ORG
// /////////////////////////////////////////////////////////////////////////////
// This code is copyright (c) by Siegfried Steiner, Munich, Germany and licensed
// under the following (see "http://en.wikipedia.org/wiki/Multi-licensing")
// licenses:
// -----------------------------------------------------------------------------
// GNU General Public License, v3.0 ("http://www.gnu.org/licenses/gpl-3.0.html")
// -----------------------------------------------------------------------------
// Apache License, v2.0 ("http://www.apache.org/licenses/LICENSE-2.0")
// -----------------------------------------------------------------------------
// Please contact the copyright holding author(s) of the software artifacts in
// question for licensing issues not being covered by the above listed licenses,
// also regarding commercial licensing models or regarding the compatibility
// with other open source licenses.
// /////////////////////////////////////////////////////////////////////////////

package org.refcodes.decoupling;

/**
 * The {@link InstanceMetrics} define the creation of a {@link Dependency}'s
 * instance and it's combinations are provided for convenience means by the
 * enumeration {@link InstanceMode}.
 */
public interface InstanceMetrics {

	/**
	 * True in case the {@link Dependency} represents a singleton.
	 * 
	 * @return True in case of being a singleton {@link Dependency}.
	 */
	boolean isSingleton();

	/**
	 * True in case a {@link Dependency} is required to be instantiated in any
	 * case, even if not being demanded by another dependency.
	 * 
	 * @return True in case of being a required {@link Dependency}.
	 */
	boolean isMandatory();

}