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The ActiveMQ Message Broker implementation

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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.activemq.broker.jmx;

import java.util.List;

import javax.management.openmbean.TabularData;

/**
 * Returns the status events of the broker to indicate any warnings.
 */
public interface HealthViewMBean {

    public TabularData health() throws Exception;

    /**
     * Warning this method can only be invoked if you have the correct version
     * of {@link HealthStatus} on your classpath or you use something
     * like jolokia to access JMX.
     *
     * If in doubt, please use the {@link #getCurrentStatus()} method instead!
     *
     * @return a list of HealthStatus objects that describe the health of the Broker.
     */
    @MBeanInfo("List of warnings and errors about the current health of the Broker - empty list is Good!")
    List healthList() throws Exception;

    /**
     * @return a String representation of current Broker health state.
     */
    @MBeanInfo("String representation of current Broker state")
    String healthStatus() throws Exception;

    /**
     * Warning, this method only return a value if the health or healthList method has previously
     * been called.  The value is not updated on its own and requires periodic calls to the health
     * or healthList methods to refresh its value.
     *
     * @return String representation of the current Broker state
     */
    @MBeanInfo("String representation of current Broker state")
    String getCurrentStatus();

}