com.github.triceo.robozonky.app.management.MBean Maven / Gradle / Ivy

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/*
 * Copyright 2017 Lukáš Petrovický
 *
 * Licensed 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 com.github.triceo.robozonky.app.management;

import java.lang.management.ManagementFactory;
import java.util.stream.Stream;
import javax.management.InstanceAlreadyExistsException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public enum MBean {

    RUNTIME {
        @Override
        protected BaseMBean createImplementation() {
            return new Runtime();
        }
    },
    INVESTMENTS {
        @Override
        protected BaseMBean createImplementation() {
            return new Investments();
        }
    },
    PORTFOLIO {
        @Override
        protected BaseMBean createImplementation() {
            return new Portfolio();
        }
    };

    private static final Logger LOGGER = LoggerFactory.getLogger(MBean.class);

    public static void loadAll() {
        MBean.LOGGER.debug("Registering MBeans.");
        final MBeanServer server = ManagementFactory.getPlatformMBeanServer();
        Stream.of(MBean.values())
                .filter(mbean -> mbean.getObjectName() != null)
                .forEach(mbean -> {
                    try {
                        final ObjectName name = mbean.getObjectName();
                        server.registerMBean(mbean.getImplementation(), name);
                        MBean.LOGGER.debug("Registered MBean '{}'.", name);
                    } catch (final NotCompliantMBeanException | InstanceAlreadyExistsException |
                            MBeanRegistrationException ex) {
                        MBean.LOGGER.warn("Failed loading MBean.", ex);
                    }
                });
        MBean.LOGGER.debug("MBeans registered.");
    }

    public static void unloadAll() {
        MBean.LOGGER.debug("Unregistering MBeans.");
        final MBeanServer server = ManagementFactory.getPlatformMBeanServer();
        Stream.of(MBean.values())
                .filter(mbean -> mbean.getObjectName() != null)
                .map(MBean::getObjectName)
                .forEach(name -> {
                    try {
                        server.unregisterMBean(name);
                        MBean.LOGGER.debug("Unregistered MBean '{}'.", name);
                    } catch (final InstanceNotFoundException | MBeanRegistrationException ex) {
                        MBean.LOGGER.info("Failed unloading MBean.", ex);
                    }
                });
        MBean.LOGGER.debug("MBeans unregistered.");
    }

    private static ObjectName assembleObjectName(final BaseMBean implementation) {
        try {
            final String className = implementation.getClass().getSimpleName();
            return new ObjectName("com.github.triceo.robozonky:type=" + className);
        } catch (final MalformedObjectNameException ex) {
            LoggerFactory.getLogger(MBean.class).warn("MBean '{}' will be ignored.", implementation.getClass(), ex);
            return null;
        }
    }

    private final BaseMBean implementation;
    private ObjectName objectName;

    MBean() {
        this.implementation = this.createImplementation();
        this.objectName = MBean.assembleObjectName(implementation);
    }

    abstract protected BaseMBean createImplementation();

    public BaseMBean getImplementation() {
        return implementation;
    }

    public ObjectName getObjectName() {
        return objectName;
    }

}