/**
* This file is part of CloudML [ http://cloudml.org ]
*
* Copyright (C) 2012 - SINTEF ICT
* Contact: Franck Chauvel <franck.chauvel@sintef.no>
*
* Module: root
*
* CloudML is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* CloudML 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with CloudML. If not, see
* <http://www.gnu.org/licenses/>.
*/
package org.cloudml.core.actions;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.cloudml.core.InternalComponent;
import org.cloudml.core.Deployment;
import org.cloudml.core.Component;
import org.cloudml.core.ComponentInstance;
public class FindHost extends AbstractFind<ComponentInstance<? extends Component>> {
private final InternalComponent componentType;
private final ArrayList<ComponentInstance<? extends Component>> excluded;
public FindHost(StandardLibrary library, InternalComponent artefact, ComponentInstance<? extends Component>... toExclude) {
super(library);
this.componentType = rejectIfInvalid(artefact);
this.excluded = new ArrayList<ComponentInstance<? extends Component>>(Arrays.asList(toExclude));
}
private InternalComponent rejectIfInvalid(InternalComponent type) {
if (type == null) {
throw new IllegalStateException("Unable to find a host for the 'null' component type!");
}
return type;
}
@Override
protected ArrayList<ComponentInstance<? extends Component>> collectCandidates(Deployment deployment) {
final ArrayList<ComponentInstance<? extends Component>> candidates = new ArrayList<ComponentInstance<? extends Component>>();
for (ComponentInstance<? extends Component> instance : deployment.getComponentInstances()) {
if (isCandidate(instance)) {
candidates.add(instance);
}
}
return candidates;
}
@Override
protected void handleLackOfCandidate(Deployment deployment, List<ComponentInstance<? extends Component>> candidates) {
Component type = getLibrary().findHostType(deployment, componentType);
candidates.add(getLibrary().provision(deployment, type));
}
private boolean isCandidate(ComponentInstance<? extends Component> instance) {
return instance.canHost(componentType)
&& !isExcluded(instance);
}
private boolean isExcluded(ComponentInstance<? extends Component> instance) {
return this.excluded.contains(instance);
}
}