/*
* JBoss, Home of Professional Open Source.
* Copyright 2013, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.wildfly.clustering.ejb;
/**
* Represents a bean and the group to which it is associated.
* @author Paul Ferraro
*
* @param <G> the group identifier type
* @param <I> the bean identifier type
* @param <T> the bean instance type
*/
public interface Bean<I, T> extends AutoCloseable {
/**
* Returns the identifier of this bean.
* @return a unique identifier
*/
I getId();
/**
* Returns the identifier of the group to which this bean is associated.
* @return a unique identifier of a group
*/
I getGroupId();
/**
* Acquires a reference to the bean instance.
* Every call to {@link #acquire()} should be paired with a call to {@link #release()}.
* @return the bean instance
*/
T acquire();
/**
* Releases a reference to the bean made via {@link #acquire()}.
* @return true, if all acquisitions have been released, false otherwise.
*/
boolean release();
/**
* Indicates whether or not the specified bean is expired.
* @return true, if this bean has expired, false otherwise.
*/
boolean isExpired();
/**
* Removes this bean, notifying the specified listener.
* @param listener a remove listener
*/
void remove(RemoveListener<T> listener);
/**
* Indicates whether this bean was removed.
* @return false, if this bean was removed, true otherwise.
*/
boolean isValid();
/**
* Closes any resources used by this bean.
* A bean should only be closed when all referenced have been released,
* i.e. {@link #release()} returned true.
*/
@Override
void close();
}