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/*
 * Licensed to the University Corporation for Advanced Internet Development,
 * Inc. (UCAID) under one or more contributor license agreements.  See the
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID 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.opensaml.saml.metadata.resolver;

import javax.annotation.Nullable;

import org.joda.time.DateTime;

import net.shibboleth.utilities.java.support.resolver.ResolverException;

/**
 * Specialization of {@link MetadataResolver} that supports on-demand refresh.
 */
public interface RefreshableMetadataResolver extends MetadataResolver {
    
    /**
     * Refresh the data exposed by the resolver.
     * 
     * 
     * An implementation of this method should typically be either synchronized
     * or make use other locking mechanisms to protect against concurrent access.
     * 
     * 
     * @throws ResolverException if the refresh operation was unsuccessful
     */
    void refresh() throws ResolverException;

    /**
     * Gets the time the last refresh cycle occurred.
     * 
     * @return time the last refresh cycle occurred
     */
    @Nullable DateTime getLastRefresh();

    /**
     * Get the time that the currently available metadata was last updated. Note, this may be different than the time
     * retrieved by {@link #getLastRefresh()} is the metadata was known not to have changed during the last refresh
     * cycle.
     * 
     * @return time when the currently metadata was last updated, null if metadata has never successfully been read in
     */
    @Nullable DateTime getLastUpdate();
    
}