EagerBeansPhaseListener.java

/*
 * Copyright 2017 OmniFaces
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package org.omnifaces.cdi.eager;

import static javax.faces.event.PhaseId.RESTORE_VIEW;
import static org.omnifaces.util.Beans.getReference;
import static org.omnifaces.util.FacesLocal.getViewId;

import javax.faces.event.PhaseEvent;

import org.omnifaces.eventlistener.DefaultPhaseListener;

/**
 * <p>
 * A PhaseListener that instantiates eager request/view beans by JSF view ID.
 * <p>
 * This instantiates beans relatively late during request processing but at a point that faces context and the view root
 * corresponding to the current view ID are available to the bean.
 *
 * @since 1.8
 * @author Arjan Tijms
 *
 */
public class EagerBeansPhaseListener extends DefaultPhaseListener {

	private static final long serialVersionUID = -7252366571645029385L;

	private boolean hasAnyViewIdBeans;

	public EagerBeansPhaseListener() {
		super(RESTORE_VIEW);
		EagerBeansRepository eagerBeansRepository = getReference(EagerBeansRepository.class);
		hasAnyViewIdBeans = (eagerBeansRepository != null) && eagerBeansRepository.hasAnyViewIdBeans();
	}

	@Override
	public void afterPhase(PhaseEvent event) {
		if (hasAnyViewIdBeans) {
			getReference(EagerBeansRepository.class).instantiateByViewID(getViewId(event.getFacesContext()));
		}
	}

}