/**
 * 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 backtype.storm;

import java.util.Map;

/**
 * Allows a bolt or a spout to be informed when the credentials of the topology have changed.
 */
public interface ICredentialsListener {
    /**
     * Called when the credentials of a topology have changed.
     * 
     * @param credentials the new credentials, could be null.
     */
    public void setCredentials(Map<String, String> credentials);
}