001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.hadoop.hdfs.server.namenode;
019    
020    import org.apache.hadoop.classification.InterfaceAudience;
021    import org.apache.hadoop.classification.InterfaceStability;
022    
023    /**
024     * This is the JMX management interface for NameNode status information
025     */
026    @InterfaceAudience.Public
027    @InterfaceStability.Evolving
028    public interface NameNodeStatusMXBean {
029    
030      /**
031       * Gets the NameNode role.
032       *
033       * @return the NameNode role.
034       */
035      public String getNNRole();
036    
037      /**
038       * Gets the NameNode state.
039       *
040       * @return the NameNode state.
041       */
042      public String getState();
043    
044      /**
045       * Gets the host and port colon separated.
046       *
047       * @return host and port colon separated.
048       */
049      public String getHostAndPort();
050    
051      /**
052       * Gets if security is enabled.
053       *
054       * @return true, if security is enabled.
055       */
056      public boolean isSecurityEnabled();
057    }