org.apache.river.landlord.ConstrainableLandlordLeaseMap Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.river.landlord;

import net.jini.core.lease.Lease;
import net.jini.core.constraint.MethodConstraints;
import net.jini.core.constraint.RemoteMethodControl;
import net.jini.id.Uuid;
import net.jini.id.ReferentUuid;
import org.apache.river.proxy.ConstrainableProxyUtil;

/**
 * Constrainable sub-class of LandlordLeaseMap.
 * @author Sun Microsystems, Inc.
 * @since 2.0
 */
final public class ConstrainableLandlordLeaseMap extends LandlordLeaseMap {
    /** 
     * Create a new ConstrainableLandlordLeaseMap.
     * @param landlord Reference to the entity that created 
     *                 lease.  Assumes that any
     *                 necessary method constraints have been
     *                 attached.
     * @param landlordUuid a universally unique id that has been
     *                 assigned to the server granting of the lease.
     *                 Ideally the Uuid {@link
     *                 ReferentUuid#getReferentUuid landlord.getUuid} would
     *                 return if landlord implemented
     *                 {@link ReferentUuid}. Used to determine when
     *                 leases can be added to this map.
     * @param lease    First lease to be placed in the map.  It is
     *                 assumed that canContainKey(lease)
     *                 would be true.  Must work with the 
     *                 landlord protocol.
     * @param duration The duration the lease should be renewed for if 
     *                 renewAll is called.
     * @throws ClassCastException if landlord
     *                 does not implement RemoteMethodControl.
     * @throws NullPointerException if landlord is null.
     */
    ConstrainableLandlordLeaseMap(Landlord landlord, Uuid landlordUuid, 
				  LandlordLease lease, long duration) 
    {
	super(chLandlord(landlord), landlordUuid, lease, duration);
	
    }
    
    private static Landlord chLandlord(Landlord landlord) throws ClassCastException {
        if (!(landlord instanceof RemoteMethodControl))
	    throw new ClassCastException("landlord must implement " +
					 "RemoteMethodControl");
        return landlord;
    }


    // doc inherited from super
    public boolean canContainKey(Object key) {
	if (!super.canContainKey(key))
	    return false;	

	// Same landlord, check to see if we have comparable constraints.
	if (!(key instanceof ConstrainableLandlordLease))
	    return false;

	// The key's constraints
	final MethodConstraints lmc = 
	    ((ConstrainableLandlordLease)key).getConstraints();

	// Our constraints
	final MethodConstraints omc = 
	    ((RemoteMethodControl)landlord()).getConstraints();

	// Are they equivalent (after applying the map)?
	return ConstrainableProxyUtil.equivalentConstraints(
	    lmc, omc, ConstrainableLandlordLease.leaseMapMethodMapArray);

    }
}