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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 */
package javax.ejb;

import java.io.Serializable;
import java.util.Date;

/**
 *
 * The Timer interface contains information about a timer
 * that was created through the EJB Timer Service.
 *
 */
public interface Timer {

    /**
     * Cause the timer and all its associated expiration notifications to
     * be cancelled.
     *
     *
     * @exception java.lang.IllegalStateException If this method is
     * invoked while the instance is in a state that does not allow access 
     * to this method.
     * 
     * @exception javax.ejb.NoSuchObjectLocalException If invoked on a timer
     * that has expired or has been cancelled.
     * 
     * @exception javax.ejb.EJBException If this method could not complete due
     * to a system-level failure.
     */
    public void cancel() throws java.lang.IllegalStateException, javax.ejb.NoSuchObjectLocalException, javax.ejb.EJBException;
    
    /**
     * Get the number of milliseconds that will elapse before the next
     * scheduled timer expiration. 
     *
     * @return the number of milliseconds that will elapse before the next
     * scheduled timer expiration.
     *
     * @exception java.lang.IllegalStateException If this method is
     * invoked while the instance is in a state that does not allow access 
     * to this method.
     * 
     * @exception javax.ejb.NoSuchObjectLocalException If invoked on a timer
     * that has expired or has been cancelled.
     * 
     * @exception javax.ejb.EJBException If this method could not complete due
     * to a system-level failure.
     */
    public long getTimeRemaining() throws java.lang.IllegalStateException, javax.ejb.NoSuchObjectLocalException, javax.ejb.EJBException;

    /**
     * Get the point in time at which the next timer expiration is scheduled 
     * to occur.
     *
     * @return the point in time at which the next timer expiration is 
     * scheduled to occur.
     *
     * @exception java.lang.IllegalStateException If this method is
     * invoked while the instance is in a state that does not allow access 
     * to this method.
     * 
     * @exception javax.ejb.NoSuchObjectLocalException If invoked on a timer
     * that has expired or has been cancelled.
     * 
     * @exception javax.ejb.EJBException If this method could not complete due
     * to a system-level failure.
     */
    public Date getNextTimeout() throws java.lang.IllegalStateException, javax.ejb.NoSuchObjectLocalException, javax.ejb.EJBException;

    /**
     * Get the information associated with the timer at the time of creation.
     *
     * @return The Serializable object that was passed in at timer creation, or
     * null if the info argument passed in at timer creation was null.
     *
     * @exception java.lang.IllegalStateException If this method is
     * invoked while the instance is in a state that does not allow access 
     * to this method.
     * 
     * @exception javax.ejb.NoSuchObjectLocalException If invoked on a timer
     * that has expired or has been cancelled.
     * 
     * @exception javax.ejb.EJBException If this method could not complete due
     * to a system-level failure.
     */
    public Serializable getInfo() throws java.lang.IllegalStateException, javax.ejb.NoSuchObjectLocalException, javax.ejb.EJBException;


    /**
     * Get a serializable handle to the timer.  This handle can
     * be used at a later time to re-obtain the timer reference.
     *
     * @return a serializable handle to the timer.
     * 
     * @exception java.lang.IllegalStateException If this method is
     * invoked while the instance is in a state that does not allow access 
     * to this method.
     * 
     * @exception javax.ejb.NoSuchObjectLocalException If invoked on a timer
     * that has expired or has been cancelled.
     * 
     * @exception javax.ejb.EJBException If this method could not complete due
     * to a system-level failure.
     */
    public TimerHandle getHandle() throws java.lang.IllegalStateException, javax.ejb.NoSuchObjectLocalException, javax.ejb.EJBException;

}