/*******************************************************************************
* Copyright (c) 2011 EclipseSource
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* EclipseSource - Bug 358442 Change InstallArtifact graph from a tree to a DAG
*******************************************************************************/
package org.eclipse.virgo.kernel.install.artifact.internal;
import org.eclipse.virgo.kernel.install.artifact.InstallArtifact;
import org.eclipse.virgo.util.common.DirectedAcyclicGraph;
import org.eclipse.virgo.util.common.ThreadSafeDirectedAcyclicGraph;
/**
* {@link InstallArtifactDAGSingletonFactory} is used to create the graph of
* {@link InstallArtifact InstallArtifacts}.
* <p />
*
* <strong>Concurrent Semantics</strong><br />
*
* Implementations of this interface must be thread safe.
*
*/
final class InstallArtifactDAGSingletonFactory {
private static final DirectedAcyclicGraph<InstallArtifact> DAG = new ThreadSafeDirectedAcyclicGraph<InstallArtifact>();
public static DirectedAcyclicGraph<InstallArtifact> createInstance() {
return DAG;
}
}